squilu/SquiLu-ext/sq_sqlite3.cpp

/* Code generated by script */
#include "squirrel.h"
#include "sqlite3.h"
#include <string.h>
#include <stdio.h>
#include "sqstdblobimpl.h"

typedef struct sq_sqlite3_sdb sq_sqlite3_sdb;
typedef struct sq_sqlite3_sdb_func sq_sqlite3_sdb_func;

/* to use as C user data so i know what function sqlite is calling */
struct sq_sqlite3_sdb_func
{
    /* references to associated lua values */
    HSQOBJECT fn_step;
    HSQOBJECT fn_finalize;
    HSQOBJECT udata;

    sq_sqlite3_sdb *sdb;
    sq_sqlite3_sdb_func *next;
};

/* information about database */
struct sq_sqlite3_sdb
{
    /* associated squirrel vm */
    HSQUIRRELVM v;
    /* sqlite database handle */
    sqlite3 *db;

    /* sql functions stack usage */
    sq_sqlite3_sdb_func *func;         /* top SQL function being called */

    /* references */
    HSQOBJECT busy_cb;        /* busy callback */
    HSQOBJECT busy_udata;

    HSQOBJECT progress_cb;    /* progress handler */
    HSQOBJECT progress_udata;

    HSQOBJECT trace_cb;       /* trace callback */
    HSQOBJECT trace_udata;
    HSQOBJECT null_value;
};

SQ_OPT_STRING_STRLEN();

static const SQChar *SQLite3_TAG = "SQLite3";
static const SQChar *SQLite3_Stmt_TAG = "SQLite3Stmt";

static const SQChar sqlite3_NULL_Name[] = _SC("sqlite3_NULL");
static const SQChar nullName[] = _SC("Null");
static SQRESULT sqlite3_NULL_tostring(HSQUIRRELVM v)
{
    sq_pushstring(v, "", 0);
    return 1;
}
SQRegFunction sqlite3_NULL_methods[]=
{
    {_SC("_tostring"),sqlite3_NULL_tostring,1, _SC(".")},
    {0,0}
};

static SQRESULT get_sqlite3_instance(HSQUIRRELVM v, SQInteger idx, sq_sqlite3_sdb **sdb)
{
    SQRESULT _rc_;
    if((_rc_ = sq_getinstanceup(v,idx,(SQUserPointer*)sdb,(void*)SQLite3_TAG)) < 0) return _rc_;
    if(!*sdb) return sq_throwerror(v, _SC("database is closed"));
    return _rc_;
}

static SQRESULT get_sqlite3_stmt_instance(HSQUIRRELVM v, SQInteger idx, sqlite3_stmt **stmt)
{
    SQRESULT _rc_;
    if((_rc_ = sq_getinstanceup(v,idx,(SQUserPointer*)stmt,(void*)SQLite3_Stmt_TAG)) < 0) return _rc_;
    if(!*stmt) return sq_throwerror(v, _SC("statement is closed"));
    return _rc_;
}

//#define push_sqlite3_null(v) sq_getonregistrytable(v, sqlite3_NULL_Name, sizeof(sqlite3_NULL_Name)-1);
//#define push_sqlite3_null(v) sq_pushobject(v, sqlite3_NULL);
//#define push_sqlite3_null(v) sq_getbyname(v, 1, nullName, sizeof(nullName)-1)
//#define push_sqlite3_null(v) sq_pushfromregistrytable(v, nullName, sizeof(nullName)-1)
//#define push_sqlite3_null(v) {sq_pushregistrytable(v);sq_pushstring(v, sqlite3_NULL_Name, sizeof(sqlite3_NULL_Name)-1);sq_get(v, -2);sq_remove(v,-2);}
//the line bellow is the fastest one, any other attempt till now was slower
#define push_sqlite3_null(v) {sq_pushstring(v, nullName, sizeof(nullName)-1);sq_get(v, 1);}

#define GET_sqlite3_INSTANCE_AT(idx) \
	sq_sqlite3_sdb *sdb=NULL; \
	if((_rc_ = get_sqlite3_instance(v,idx,&sdb)) < 0) return _rc_;\
	sqlite3 *self = sdb->db;

#define GET_sqlite3_INSTANCE() GET_sqlite3_INSTANCE_AT(1)

//#define GET_sqlite3_INSTANCE() SQ_GET_INSTANCE(v, 1, sqlite3, SQLite3_TAG)
#define GET_sqlite3_stmt_INSTANCE()  \
	sqlite3_stmt *self=NULL; \
	if((_rc_ = get_sqlite3_stmt_instance(v,1,&self)) < 0) return _rc_;

enum e_type_result {tr_first_row_first_col, tr_first_row, tr_all_rows, tr_ddml};

#define AS_STRING_ALWAYS 0x01
#define NULL_AS_EMPTY_STR 0x02
#define WITH_COL_NAMES 0x04

static void sqlite3_stmt_push_string(HSQUIRRELVM v, sqlite3_stmt *stmt, int col, int flags)
{
    const char *value = (const char*) sqlite3_column_text(stmt, col);
    if(value) sq_pushstring(v, value, sqlite3_column_bytes(stmt, col));
    else push_sqlite3_null(v);
}

static SQRESULT sqlite3_stmt_push_value(HSQUIRRELVM v, sqlite3_stmt *stmt, int col, int flags)
{
    const char *value;

    if(flags & AS_STRING_ALWAYS) sqlite3_stmt_push_string(v, stmt, col, flags);
    else
    {
        switch (sqlite3_column_type(stmt, col))
        {
        case SQLITE_INTEGER:
        {
            sqlite_int64 i64 = sqlite3_column_int64(stmt, col);
            SQInteger n = (SQInteger)i64;
            if (n == i64)
                sq_pushinteger(v, n);
            else
                sq_pushstring(v, (const char*) sqlite3_column_text(stmt, col), sqlite3_column_bytes(stmt, col));
        }
        break;
        case SQLITE_FLOAT:
            sq_pushfloat(v, sqlite3_column_double(stmt, col));
            break;
        case SQLITE_TEXT:
            sqlite3_stmt_push_string(v, stmt, col, flags);
            break;
        case SQLITE_BLOB:
            value = (const char*) sqlite3_column_blob(stmt, col);
            if(value) sq_pushstring(v, value, sqlite3_column_bytes(stmt, col));
            else push_sqlite3_null(v);
            break;
        case SQLITE_NULL:
            push_sqlite3_null(v);
            break;
        default:
            push_sqlite3_null(v);
            break;
        }
    }
    return 1;
}

static void sqlite3_stmt_row_asArray(HSQUIRRELVM v, sqlite3_stmt *stmt, int flags)
{
    int col_count = sqlite3_column_count(stmt);
    sq_newarray(v, col_count);
    for(int i=0; i<col_count; ++i)
    {
        sqlite3_stmt_push_value(v, stmt, i, flags);
        sq_arrayset(v, -2, i);
    }
}

static void sqlite3_stmt_row_asTable(HSQUIRRELVM v, sqlite3_stmt *stmt, int flags)
{
    int col_count = sqlite3_column_count(stmt);
    sq_newtable(v);
    for(int i=0; i<col_count; ++i)
    {
        sq_pushstring(v, sqlite3_column_name(stmt, i), -1);
        sqlite3_stmt_push_value(v, stmt, i, flags);
        sq_rawset(v, -3);
    }
}

static void sqlite3_stmt_asArrayOfArrays(HSQUIRRELVM v, sqlite3_stmt *stmt, int flags)
{
    sq_newarray(v, 0);
    if(flags & WITH_COL_NAMES)
    {
        int col_count = sqlite3_column_count(stmt);
        sq_newarray(v, col_count);
        for(int i=0; i<col_count; ++i)
        {
            sq_pushstring(v, sqlite3_column_name(stmt, i), -1);
            sq_arrayset(v, -2, i);
        }
        sq_arrayappend(v, -2);
    }
    while(sqlite3_step(stmt) == SQLITE_ROW)
    {
        sqlite3_stmt_row_asArray(v, stmt, flags);
        sq_arrayappend(v, -2);
    }
}

static void sqlite3_stmt_asArrayOfTables(HSQUIRRELVM v, sqlite3_stmt *stmt, int flags)
{
    sq_newarray(v, 0);
    while(sqlite3_step(stmt) == SQLITE_ROW)
    {
        sqlite3_stmt_row_asTable(v, stmt, flags);
        sq_arrayappend(v, -2);
    }
}

static SQRESULT sqlite3_stmt_bind_value(HSQUIRRELVM v, sqlite3_stmt *stmt, int npar, int argn)
{
    int _rc_ = 0;
    SQObjectType ptype = sq_gettype(v, argn);
    switch(ptype)
    {
    case OT_BOOL:
        SQ_GET_BOOL(v, argn, param_bool);
        _rc_ = sqlite3_bind_int(stmt, npar, param_bool == SQTrue ? 1 : 0);
        break;
    case OT_INTEGER:
        SQ_GET_INTEGER(v, argn, param_integer);
        _rc_ = sqlite3_bind_int64(stmt, npar, param_integer);
        break;
    case OT_FLOAT:
        SQ_GET_FLOAT(v, argn, param_float);
        _rc_ = sqlite3_bind_double(stmt, npar, param_float);
        break;
    case OT_STRING:
    {
        SQ_GET_STRING(v, argn, param_string);
        _rc_ = sqlite3_bind_text(stmt, npar, param_string, param_string_size, SQLITE_TRANSIENT);
    }
    break;
    case OT_NULL:
        _rc_ = sqlite3_bind_null(stmt, npar);
        break;
    default:
        return sq_throwerror(v, "Invalid bind parameter %d", npar);
    }
    if(_rc_ != SQLITE_OK)
    {
        sqlite3 *db = sqlite3_db_handle(stmt);
        return sq_throwerror(v, sqlite3_errmsg(db));
    }
    return SQ_OK;
}

static SQRESULT sq_sqlite3_stmt_prepare_aux(HSQUIRRELVM v, sqlite3 *db, sqlite3_stmt **stmt, int params_start)
{
    SQ_FUNC_VARS(v);
    SQ_GET_STRING(v, params_start, szSQL);
    if(sqlite3_prepare_v2(db, szSQL, szSQL_size, stmt, 0) != SQLITE_OK)
    {
        return sq_throwerror(v, sqlite3_errmsg(db));
    }

    if(_top_ > params_start)
    {
        int nparams = sqlite3_bind_parameter_count(*stmt);
        int nparams_given = _top_-params_start;
        if(nparams != nparams_given)
        {
            return sq_throwerror(v, "expect %d parameters but only %d given", nparams, nparams_given);
        }
        for(int i=1; i <= nparams; ++i)
        {
            int argn = i+params_start;
            _rc_ = sqlite3_stmt_bind_value(v, *stmt, i, argn);
            if(_rc_ < 0) return _rc_;
        }
    }
    return SQ_OK;
}

static SQRESULT sq_sqlite3_stmt_releasehook(SQUserPointer p, SQInteger size, HSQUIRRELVM v)
{
    sqlite3_stmt *stmt = ((sqlite3_stmt *)p);
    if(stmt) sqlite3_finalize(stmt);
    return 0;
}

static SQRESULT sq_sqlite3_stmt_constructor(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    _rc_ = SQ_ERROR;
    GET_sqlite3_INSTANCE_AT(2);
    sqlite3_stmt *stmt = 0;
    if(_top_ > 2)
    {
        _rc_ = sq_sqlite3_stmt_prepare_aux(v, self, &stmt, 3);
    }
    else
    {
        if(sqlite3_prepare_v2(self, "select 'statement not prepared';", -1, &stmt, 0) != SQLITE_OK)
        {
            _rc_ = sq_throwerror(v, sqlite3_errmsg(self));
        }
        else _rc_ = SQ_OK;
    }
    sq_setinstanceup(v, 1, stmt); //replace self for this instance with this new sqlite3_stmt
    sq_setreleasehook(v,1, sq_sqlite3_stmt_releasehook);
    return _rc_;
}

static SQRESULT sq_sqlite3_stmt_get_db(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sqlite3 *db = sqlite3_db_handle(self);
    sq_pushuserpointer(v, db);
    if(sq_getonregistrytable(v) == SQ_OK)
    {
        sq_getweakrefval(v, -1);
    }
    else return sq_throwerror(v, _SC("could not retrive database, maybe it was already closed"));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_stmt_ptr(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_pushuserpointer(v, self);
    return 1;
}

static SQRESULT sq_sqlite3_stmt_finalize(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_setinstanceup(v, 1, 0); //next calls will fail with "statement is closed"
    sq_pushinteger(v, sqlite3_finalize(self));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_prepare(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sqlite3 *db = sqlite3_db_handle(self);

    sqlite3_stmt *stmt = 0;
    _rc_ = sq_sqlite3_stmt_prepare_aux(v, db, &stmt, 2);
    if(stmt)
    {
        sqlite3_finalize(self); //finalize the previous sqlite3_stmt
        sq_setinstanceup(v, 1, stmt); //replace self for this instance with this new sqlite3_stmt
    }
    return _rc_;
}

static SQRESULT sq_sqlite3_stmt_get_sql(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_pushstring(v, sqlite3_sql(self), -1);
    return 1;
}

static SQRESULT sq_sqlite3_stmt_bind(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_INTEGER(v, 2, npar);
    return sqlite3_stmt_bind_value(v, self, npar, 3);
}

static SQRESULT sq_sqlite3_stmt_bind_empty_null(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_INTEGER(v, 2, npar);
    if(sq_gettype(v, 3) == OT_STRING && sq_getsize(v, 3) == 0)
    {
        sq_pushnull(v);
        sq_replace(v, 3);
    }
    return sqlite3_stmt_bind_value(v, self, npar, 3);
}

static SQRESULT sq_sqlite3_stmt_bind_blob(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_INTEGER(v, 2, npar);
    SQ_GET_STRING(v, 3, blob);
    if(sqlite3_bind_blob(self, npar, blob, blob_size, SQLITE_TRANSIENT) != SQLITE_OK)
    {
        sqlite3 *db = sqlite3_db_handle(self);
        return sq_throwerror(v, sqlite3_errmsg(db));
    }
    return SQ_OK;
}

static SQRESULT sq_sqlite3_stmt_bind_values(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_stmt_INSTANCE();

    if (_top_ - 1 != sqlite3_bind_parameter_count(self))
        return sq_throwerror(v,
                             _SC("incorrect number of parameters to bind (%d given, %d to bind)"),
                             _top_ - 1,
                             sqlite3_bind_parameter_count(self));

    for (int n = 2; n <= _top_; ++n)
    {
        if (sqlite3_stmt_bind_value(v, self, n-1, n) != SQ_OK) return SQ_ERROR;
    }
    return 0;
}

static SQRESULT sq_sqlite3_stmt_bind_names(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();

    SQObjectType ptype = sq_gettype(v, 2);
    int count = sqlite3_bind_parameter_count(self);
    int result;

    for (int n = 1; n <= count; ++n)
    {
        const char *name = sqlite3_bind_parameter_name(self, n);
        if (name && (name[0] == ':' || name[0] == '$' || name[0] == '@'))
        {
            if(ptype == OT_TABLE)
            {
                sq_pushstring(v, ++name, -1);
                if(sq_get(v, 2) == SQ_OK)
                {
                    result = sqlite3_stmt_bind_value(v, self, n, -1);
                    sq_poptop(v);
                }
                else return sq_throwerror(v, _SC("bind parameter (%s) not found"), name);
            }
            else return sq_throwerror(v, _SC("table expected to bind named parameters"));
        }
        else
        {
            if(ptype == OT_ARRAY)
            {
                sq_pushinteger(v, n);
                if(sq_get(v, 2) == SQ_OK)
                {
                    result = sqlite3_stmt_bind_value(v, self, n, -1);
                    sq_poptop(v);
                }
                else return sq_throwerror(v, _SC("bind parameter (%d) not found"), n);
            }
            else return sq_throwerror(v, _SC("array expected to bind numbered parameters"));
        }

        if (result != SQ_OK) return result;
    }
    return 0;
}

static SQRESULT sq_sqlite3_stmt_bind_parameter_index(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_STRING(v, 2, spar);
    sq_pushinteger(v, sqlite3_bind_parameter_index(self, spar));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_reset(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_pushinteger(v, sqlite3_reset(self));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_step(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_pushinteger(v, sqlite3_step(self));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_next_row(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_pushbool(v, sqlite3_step(self) == SQLITE_ROW);
    return 1;
}

static SQRESULT sq_sqlite3_stmt_col_count(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    sq_pushinteger(v, sqlite3_column_count(self));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_colsAsArray(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col_count = sqlite3_column_count(self);
    sq_newarray(v, col_count);
    for(int i=0; i<col_count; ++i)
    {
        sq_pushstring(v, sqlite3_column_name(self, i), -1);
        sq_arrayset(v, -2, i);
    }
    return 1;
}

static SQRESULT sq_sqlite3_stmt_colsAsTable(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col_count = sqlite3_column_count(self);
    sq_newtable(v);
    for(int i=0; i<col_count; ++i)
    {
        sq_pushstring(v, sqlite3_column_name(self, i), -1);
        sq_pushinteger(v, i);
        sq_rawset(v, -3);
    }
    return 1;
}

static SQRESULT sq_sqlite3_stmt_col_name(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_INTEGER(v, 2, col);
    sq_pushstring(v, sqlite3_column_name(self, col), -1);
    return 1;
}

static SQRESULT sq_sqlite3_stmt_col_type(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_INTEGER(v, 2, col);
    sq_pushinteger(v, sqlite3_column_type(self, col));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_col_declared_type(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_GET_INTEGER(v, 2, col);
    sq_pushstring(v, sqlite3_column_decltype(self, col), -1);
    return 1;
}

static int get_col_index(HSQUIRRELVM v, sqlite3_stmt *self)
{
    SQInteger _rc_, col;
    switch(sq_gettype(v, 2))
    {
    case OT_INTEGER:
        sq_getinteger(v, 2, &col);
        break;
    case OT_STRING:
    {
        SQ_GET_STRING(v, 2, col_name);
        if(col_name_size == 0) return sq_throwerror(v, "column name can not be empty");
        col = -1;
        for(int i=0, len=sqlite3_column_count(self); i<len; ++i)
        {
            if(strcasecmp(col_name, sqlite3_column_name(self, i)) == 0)
            {
                col = i;
                break;
            }
        }
        if(col == -1) return sq_throwerror(v, "column name not found \"%s\"", col_name);
    }
    break;
    default:
        return sq_throwerror(v, "wrong parameter expected integer|string");
    }
    return col;
}

static SQRESULT sq_sqlite3_stmt_col(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col = get_col_index(v, self);
    if(col < 0) return col;
    sqlite3_stmt_push_value(v, self, col, 0);

    return 1;
}

static SQRESULT sq_sqlite3_stmt_asBool(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col = get_col_index(v, self);
    if(col < 0) return col;
    const unsigned char *b = sqlite3_column_text(self, col);
    sq_pushbool(v,  b && *b == '1');

    return 1;
}

static SQRESULT sq_sqlite3_stmt_asInteger(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col = get_col_index(v, self);
    if(col < 0) return col;
    sq_pushinteger(v,  sqlite3_column_int64(self, col));

    return 1;
}

static SQRESULT sq_sqlite3_stmt_asFloat(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col = get_col_index(v, self);
    if(col < 0) return col;
    sq_pushfloat(v,  sqlite3_column_double(self, col));

    return 1;
}

static SQRESULT sq_sqlite3_stmt_StringOrNull(HSQUIRRELVM v, int withNull)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col = get_col_index(v, self);
    if(col < 0) return col;
    sqlite3_stmt_push_string(v, self, col, withNull ? 0 : NULL_AS_EMPTY_STR);

    return 1;
}

static SQRESULT sq_sqlite3_stmt_asString(HSQUIRRELVM v)
{
    return sq_sqlite3_stmt_StringOrNull(v, 0);
}

static SQRESULT sq_sqlite3_stmt_asStringOrNull(HSQUIRRELVM v)
{
    return sq_sqlite3_stmt_StringOrNull(v, 1);
}

static SQRESULT sq_sqlite3_stmt_asTable(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_OPT_INTEGER(v, 2, flags, 0);
    sqlite3_stmt_row_asTable(v, self, flags);

    return 1;
}

static SQRESULT sq_sqlite3_stmt_asArray(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_OPT_INTEGER(v, 2, flags, 0);
    sqlite3_stmt_row_asArray(v, self, flags);

    return 1;
}

static SQRESULT sq_sqlite3_stmt_asArrayOfArrays(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_OPT_INTEGER(v, 2, flags, 0);
    sqlite3_stmt_asArrayOfArrays(v, self, flags);
    sqlite3_reset(self);
    return 1;
}

static SQRESULT sq_sqlite3_stmt_asArrayOfTables(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_OPT_INTEGER(v, 2, flags, 0);
    sqlite3_stmt_asArrayOfTables(v, self, flags);
    sqlite3_reset(self);

    return 1;
}

/*utility functions*/
static void append_escaping_json(SQBlob &json, const char *sz)
{
    if(sz)  //escape string
    {
        int last_idx, idx;
        idx = last_idx = 0;
        for(; sz[idx]; ++idx)
        {
            char c = sz[idx];
            switch(c)
            {
            case '"':
            case '\n':
            case '\r':
            case '\\':
            {
                json.Write(sz+last_idx, idx-last_idx);
                last_idx = idx;
                if(c == '\n')
                {
                    json.Write("\\n", 2);
                    ++last_idx;
                }
                else if(c == '\r')
                {
                    //skip it
                    ++last_idx;
                }
                else
                {
                    json.Write("\\", 1);
                }
            }
            }
        }
        //last part
        json.Write(sz+last_idx, idx-last_idx);
    }
}

static SQRESULT sq_sqlite3_stmt_asJsonArray(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_stmt_INSTANCE();
    SQ_OPT_BOOL(v, 2, withMetadata, 0);
    int col_count = sqlite3_column_count(self);
    int i;
    const char* value;

    SQBlob json(0, 8192);

    if(withMetadata)
    {
        json.WriteZstr("{\n\"columns\":[\n");
        for(i=0; i < col_count; ++i)
        {
            json.WriteZstr((i == 0 ? "\"" : ",\""));
            json.WriteZstr(sqlite3_column_name(self, i));
            json.WriteZstr("\"");
        }

        json.WriteZstr("\n],\n\"column_types\":[\n");
        for(i=0; i < col_count; ++i)
        {
            json.WriteZstr((i == 0 ? "\"" : ",\""));
            json.WriteZstr(sqlite3_column_decltype(self, i));
            json.WriteZstr("\"");
        }

        json.WriteZstr("\n],\n\"rows\":[\n");
    }
    else
    {
        json.WriteZstr("[\n");
    }
    int row_count = 0;
    while(sqlite3_step(self) == SQLITE_ROW)
    {
        json.WriteZstr((row_count++ == 0 ? "[" : ",["));
        for(i=0; i < col_count; ++i)
        {
            json.WriteZstr((i == 0 ? "\"" : ",\""));
            value = (const char*)sqlite3_column_text(self, i);
            if(value)
            {
                switch(sqlite3_column_type(self, i))
                {
                case SQLITE_TEXT:
                {
                    append_escaping_json(json, value);
                }
                break;
                default:
                    json.WriteZstr(value);
                }
            }
            json.WriteZstr("\"");
        }
        json.WriteZstr("]\n");
    }
    json.WriteZstr("]");
    if(withMetadata) json.WriteZstr("\n}");

    sq_pushstring(v, (const SQChar*)json.GetBuf(), json.Len());
    return 1;
}

static SQRESULT sq_sqlite3_stmt_asJsonObject(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col_count = sqlite3_column_count(self);
    int i;
    const char* value;

    SQBlob json(0, 8192);

    json.WriteZstr("{");
    if(sqlite3_step(self) == SQLITE_ROW)
    {
        for(i=0; i < col_count; ++i)
        {
            json.WriteZstr((i == 0 ? "\"" : "\",\""));
            append_escaping_json(json, (const char*)sqlite3_column_name(self, i));
            json.WriteZstr("\":\"");
            value = (const char*)sqlite3_column_text(self, i);
            if(value)
            {
                switch(sqlite3_column_type(self, i))
                {
                case SQLITE_TEXT:
                {
                    append_escaping_json(json, value);
                }
                break;
                default:
                    json.WriteZstr(value);
                }
            }
        }
        json.WriteZstr("\"");
    }
    json.WriteZstr("}");

    sq_pushstring(v, (const SQChar*)json.GetBuf(), json.Len());
    return 1;
}

#define UNSIGNED(n) n##U
#define IBYTE1 UNSIGNED(255)
#define IBYTE2 UNSIGNED(255*255)
#define IBYTE3 UNSIGNED(255*255*255)
#define IBYTE4 UNSIGNED(255*255*255*255)

#define SIZE1BYTE 250
#define SIZE2BYTE 251
#define SIZE3BYTE 252
#define SIZE4BYTE 253

#define SLEMARK 254
#define SLEEND 255

static SQRESULT sle2array(HSQUIRRELVM v, const unsigned char *p, size_t sle_size, const unsigned char **next)
{
    size_t size, data_len = 0;

    if(sle_size == 0)
    {
        *next = 0;
        return 0;
    }

    while(*p != SLEEND) //data finished now follow digest
    {
        size = *p++;
        if(size >= SIZE1BYTE)
        {
            if(size == SIZE1BYTE)
            {
                //data bigger than 250 and less 500 next byte has more info
                size += *p++;
            }
            else if(size == SIZE2BYTE)
            {
                //data bigger than 250 next two bytes has more info
                size = (*p++ * IBYTE1);
                size += *p++;
            }
            else if(size == SIZE3BYTE)
            {
                //data bigger than 250 next three bytes has more info
                size = (*p++ * IBYTE2);
                size += (*p++ * IBYTE1);
                size += *p++;
            }
            else if(size == SIZE4BYTE)
            {
                //data bigger than 250 next four bytes has more info
                size = (*p++ * IBYTE3);
                size += (*p++ * IBYTE2);
                size += (*p++ * IBYTE1);
                size += *p++;
            }
            else if(size == SLEMARK)
            {
                //reserved can be used for multi part data, metadata, digest, ...
                break;
            }
        }

        sq_pushstring(v, (const char*)p, size);
        sq_arrayappend(v, -2);
        p += size;
        data_len += size;
        if(data_len > sle_size)
        {
            //something went wrong here
            return sq_throwerror(v, "We got more data than expected !");
        }
    }
    *next = ++p;
    return 0;
}

static SQRESULT sle2vec(HSQUIRRELVM v, const unsigned char *sle,
                        size_t sle_size,
                        const unsigned char **next)
{
    int rc;
    sq_newarray(v, 0);
    if(sle[0] != '[')
    {
        return sq_throwerror(v, "Invalid encoded vector !");
    }
    if(sle[1] == ']')
    {
        *next = sle+2; //empty array
        return 0;
    }
    if((rc = sle2array(v, sle+1, sle_size-1, next)) < 0) return rc;
    if(!*next || *next[0] != ']')
    {
        return sq_throwerror(v, "Invalid end of vector !");
    }
    (*next)++;
    return 0;
}

static SQRESULT sq_sle2vecOfvec(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    SQBlob *blob = NULL;
    const SQChar *sle, *sle_start;
    SQInteger sle_size;

    SQObjectType ptype = sq_gettype(v, 2);
    switch(ptype)
    {
    case OT_STRING:
        sq_getstr_and_size(v, 2, &sle, &sle_size);
        break;
    case OT_INSTANCE:
        if(SQ_FAILED(sq_getinstanceup(v,2,(SQUserPointer*)&blob,(SQUserPointer)SQBlob::SQBlob_TAG)))
            return sq_throwerror(v,_SC("invalid type tag"));
        if(!blob || !blob->IsValid())
            return sq_throwerror(v,_SC("the blob is invalid"));
        sle = (const SQChar*)blob->GetBuf();
        sle_size = blob->Len();
        break;
    default:
        return sq_throwerror(v,_SC("invalid parameter 1 of type %s"), sq_gettypename(v, 2));
    }
    if(sq_gettype(v, 3) != OT_ARRAY)
        return sq_throwerror(v,_SC("invalid parameter 2 of type %s"), sq_gettypename(v, 3));

    SQ_OPT_INTEGER(v, 4, start, 0);
    if(start < 0) return sq_throwerror(v, _SC("invalid start position (%d)"), start);
    sq_push(v, 3);

    int rc, data_count = 1;

    const unsigned char *next;
    sle_start = sle + start;
    sle_size -= start;
    if(sle_start[0] != '[')
    {
        return sq_throwerror(v, "Invalid encoded vector !");
    }
    if(sle_start[1] == ']')
    {
        //sq_pushinteger(v, start+2);
        return 1; //empty array
    }
    int saved_top = sq_gettop(v);
    if((rc=sle2vec(v, (const unsigned char *)sle_start+1, sle_size-1, &next)) < 0) return rc;
    while(next && *next == '[')
    {
        sq_arrayappend(v, -2);
        data_count++;
        if((rc=sle2vec(v, next, sle_size - (next - (const unsigned char *)sle_start), &next)) < 0) return rc;
    }
    if(sq_gettop(v) != saved_top)
    {
        //last added table left
        sq_arrayappend(v, -2);
        data_count++;
    }
    if(!next || *next != ']')
    {
        return sq_throwerror(v, "Invalid end of vector !");
    }
    sq_pushinteger(v, ((const SQChar*)(++next)) - sle);
    return 1;
}

typedef unsigned char slebuf_t[8];

static int sleSize2buf(slebuf_t sle, size_t size)
{
    size_t next_size, tmp_size;
    if(size < SIZE1BYTE)
    {
        sle[0] = size;
        return 1;
    }
    else if(size < (SIZE1BYTE*2))
    {
        sle[0] = SIZE1BYTE;
        next_size = size - 250;
        sle[1] = next_size;
        return 2;
    }
    else if(size < IBYTE2)
    {
        sle[0] = SIZE2BYTE;
        next_size = size/IBYTE1;
        sle[1] = next_size;
        next_size = size%IBYTE1;
        sle[2] = next_size;
        return 3;
    }
    else if(size < IBYTE3)
    {
        sle[0] = SIZE3BYTE;
        next_size = size/IBYTE2;
        sle[1] = next_size;
        tmp_size = size%IBYTE2;
        next_size = tmp_size/IBYTE1;
        sle[2] = next_size;
        next_size = tmp_size%IBYTE1;
        sle[3] = next_size;
        return 4;
    }
    else if(size < IBYTE4)
    {
        sle[0] = SIZE4BYTE;
        next_size = size/IBYTE3;
        sle[1] = next_size;
        tmp_size = size%IBYTE3;
        next_size = tmp_size/IBYTE2;
        sle[2] = next_size;
        tmp_size = tmp_size%IBYTE2;
        next_size = tmp_size/IBYTE1;
        sle[3] = next_size;
        next_size = tmp_size%IBYTE1;
        sle[5] = next_size;
        return 5;
    }
    return 0;
}

static SQRESULT sq_get_sle_size(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    slebuf_t slebuf;
    SQ_GET_INTEGER(v, 2, size);
    int slesize = sleSize2buf(slebuf, size);
    if(slesize)
    {
        sq_pushstring(v, (const char *)slebuf, slesize);
        return 1;
    }
    return 0;
}

static int add2sle(SQBlob &sle, const char *str, size_t size)
{
    slebuf_t slebuf;
    int slesize = sleSize2buf(slebuf, size);
    if(slesize) sle.Write((const char *)slebuf, slesize);
    if(size) sle.Write(str, size);
    return size;
}

static SQRESULT sq_add2sle(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    SQ_GET_INSTANCE_VAR(v, 2, SQBlob, blob, SQBlob::SQBlob_TAG);
    SQ_GET_STRING(v, 3, str);
    SQ_OPT_INTEGER(v, 4, size, str_size);
    if(size < 0) return sq_throwerror(v, _SC("invalid size value (%d)"), size);
    sq_pushinteger(v, add2sle(*blob, str, size));
    return 1;
}

static SQRESULT sq_sqlite3_stmt_asSleArray(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_stmt_INSTANCE();
    int col_count = sqlite3_column_count(self);
    int i;
    const char *value;

    SQBlob sle(0, 8192);

    sle.WriteZstr("[[");
    for(i=0; i < col_count; ++i)
    {
        value = sqlite3_column_name(self, i);
        add2sle(sle, value, strlen(value));
    }
    sle.WriteChar(SLEEND);
    sle.WriteChar(']');

    while(sqlite3_step(self) == SQLITE_ROW)
    {
        sle.WriteChar('[');
        for(i=0; i < col_count; ++i)
        {
            switch(sqlite3_column_type(self, i))
            {
            case SQLITE_BLOB:
            {
                add2sle(sle, (const char*)sqlite3_column_blob(self, i),
                        sqlite3_column_bytes(self, i));
            }
            break;
            default:
                add2sle(sle, (const char*)sqlite3_column_text(self, i),
                        sqlite3_column_bytes(self, i));
            }
        }
        sle.WriteChar(SLEEND);
        sle.WriteChar(']');
    }
    sle.WriteChar(']');

    sq_pushstring(v, (const SQChar*)sle.GetBuf(), sle.Len());
    return 1;
}

#define _DECL_FUNC(name,nparams,tycheck, isStatic) {_SC(#name),  sq_sqlite3_stmt_##name,nparams,tycheck, isStatic}
static SQRegFunction sq_sqlite3_stmt_methods[] =
{
    _DECL_FUNC(constructor,  -2, _SC("xxs s|n|b|o"), SQFalse),

    _DECL_FUNC(stmt_ptr,  1, _SC("x"), SQFalse),
    _DECL_FUNC(get_db,  1, _SC("x"), SQFalse),
    _DECL_FUNC(finalize,  1, _SC("x"), SQFalse),
    _DECL_FUNC(prepare,  -2, _SC("xs s|n|b|o"), SQFalse),
    _DECL_FUNC(get_sql,  1, _SC("x"), SQFalse),
    _DECL_FUNC(bind,  3, _SC("xi s|n|b|o"), SQFalse),
    _DECL_FUNC(bind_empty_null,  3, _SC("xi s|n|b|o"), SQFalse),
    _DECL_FUNC(bind_blob,  3, _SC("xis"), SQFalse),
    _DECL_FUNC(bind_values,  -2, _SC("x s|n|b|o"), SQFalse),
    _DECL_FUNC(bind_names,  2, _SC("x t|a"), SQFalse),
    _DECL_FUNC(bind_parameter_index,  2, _SC("xs"), SQFalse),
    _DECL_FUNC(step,  1, _SC("x"), SQFalse),
    _DECL_FUNC(reset,  1, _SC("x"), SQFalse),
    _DECL_FUNC(next_row,  1, _SC("x"), SQFalse),
    _DECL_FUNC(colsAsArray,  1, _SC("x"), SQFalse),
    _DECL_FUNC(colsAsTable,  1, _SC("x"), SQFalse),
    _DECL_FUNC(col_count,  1, _SC("x"), SQFalse),
    _DECL_FUNC(col_name,  2, _SC("xi"), SQFalse),
    _DECL_FUNC(col_type,  2, _SC("xi"), SQFalse),
    _DECL_FUNC(col_declared_type,  2, _SC("xi"), SQFalse),
    _DECL_FUNC(asArray,  -1, _SC("xi"), SQFalse),
    _DECL_FUNC(asTable,  -1, _SC("xi"), SQFalse),
    _DECL_FUNC(asArrayOfArrays,  -1, _SC("xi"), SQFalse),
    _DECL_FUNC(asArrayOfTables,  -1, _SC("xi"), SQFalse),
    _DECL_FUNC(asSleArray,  1, _SC("x"), SQFalse),
    _DECL_FUNC(asJsonArray,  -1, _SC("x"), SQFalse),
    _DECL_FUNC(asJsonObject,  1, _SC("x"), SQFalse),
    _DECL_FUNC(col,  2, _SC("x i|s"), SQFalse),
    _DECL_FUNC(asString,  2, _SC("x i|s"), SQFalse),
    _DECL_FUNC(asStringOrNull, 2, _SC("x i|s"), SQFalse),
    _DECL_FUNC(asInteger,  2, _SC("x i|s"), SQFalse),
    _DECL_FUNC(asBool,  2, _SC("x i|s"), SQFalse),
    _DECL_FUNC(asFloat,  2, _SC("x i|s"), SQFalse),
    {0,0}
};
#undef _DECL_FUNC

static SQRESULT sqlite3_exec_fmt(HSQUIRRELVM v, e_type_result type_result, int null_as_empty_str=1)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    //SQ_GET_STRING(v, 2, szSQL);
    sqlite3_stmt *stmt = 0;
    _rc_ = sq_sqlite3_stmt_prepare_aux(v, self, &stmt, 2);
    if(_rc_ < 0)
    {
        if(stmt) sqlite3_finalize(stmt);
        return _rc_;
    }

    int rc = sqlite3_step(stmt);

    if(type_result == tr_ddml)
    {
        if(rc != SQLITE_DONE)
        {
            sqlite3_finalize(stmt);
            return sq_throwerror(v, "SQL is not a DDML %d %s", rc, sqlite3_errmsg(self));
        }
        sq_pushinteger(v, sqlite3_changes(sqlite3_db_handle(stmt)));
    }
    else
    {
        if(rc != SQLITE_ROW)
        {
            sqlite3_finalize(stmt);
            return sq_throwerror(v, "%d %s", rc, sqlite3_errmsg(self));
        }
        switch(type_result)
        {
        case tr_first_row_first_col:
            sqlite3_stmt_push_value(v, stmt, 0, 0);
            break;
        case tr_first_row:
            sqlite3_stmt_row_asArray(v, stmt, NULL_AS_EMPTY_STR|AS_STRING_ALWAYS);
            break;
        case tr_all_rows:
            sqlite3_stmt_asArrayOfArrays(v, stmt, NULL_AS_EMPTY_STR|AS_STRING_ALWAYS);
            break;
        default:
            sqlite3_finalize(stmt);
            return sq_throwerror(v, "Unknown requested return type %d", type_result);
        }
    }
    sqlite3_finalize(stmt);
    return 1;
}


static SQRESULT sq_sqlite3_close_release(HSQUIRRELVM v, sq_sqlite3_sdb *sdb)
{
    SQRESULT rc = SQ_ERROR;
    if(sdb)
    {
        sqlite3 *db = sdb->db;
        sqlite3_stmt* statement = NULL;
        int count = 0;
        while ((statement = sqlite3_next_stmt(db, statement)))
        {
        	//do no close statements because garbage collector will do it
        	//on MacOSX we get segfaults finalizing statements here
            //sqlite3_finalize(statement);
            count++;
        }
        if (count) return sq_throwerror(v, _SC("closing database with %d statements not closed."), count);

        if(sqlite3_close_v2(db) == SQLITE_OK)
        {
            rc = SQ_OK;

            //remove waekref from registrytable
            sq_pushregistrytable(sdb->v);
            sq_pushuserpointer(sdb->v, db);
            sq_deleteslot(sdb->v, -2, SQFalse);
            sq_poptop(sdb->v);

            if(sdb->func)
            {
                sq_sqlite3_sdb_func *func, *func_next;
                func = sdb->func;
                while (func)
                {
                    func_next = func->next;
                    sq_release(sdb->v, &func->fn_step);
                    sq_release(sdb->v, &func->fn_finalize);
                    sq_release(sdb->v, &func->udata);
                    sq_free(func, sizeof(sq_sqlite3_sdb_func));
                    func = func_next;
                }
                sdb->func = NULL;
            }
            /* 'free' all references */
            sq_release(sdb->v, &sdb->busy_cb);
            sq_release(sdb->v, &sdb->busy_udata);
            sq_release(sdb->v, &sdb->progress_cb);
            sq_release(sdb->v, &sdb->progress_udata);
            sq_release(sdb->v, &sdb->trace_cb);
            sq_release(sdb->v, &sdb->trace_udata);
            sq_release(sdb->v, &sdb->null_value);

            sq_free(sdb, sizeof(sq_sqlite3_sdb));
        }
        else return sq_throwerror(v, sqlite3_errmsg(db));
    }
    return rc;
}

static SQRESULT sq_sqlite3_releasehook(SQUserPointer p, SQInteger size, HSQUIRRELVM v)
{
    sq_sqlite3_sdb *sdb = ((sq_sqlite3_sdb *)p);
    sq_sqlite3_close_release(v, sdb);
    return 0;
}

static SQRESULT sq_sqlite3_constructor(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    SQ_GET_STRING(v, 2, dbname);
    SQ_OPT_INTEGER(v, 3, flags, SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE | SQLITE_OPEN_SHAREDCACHE | SQLITE_OPEN_SUBLATIN_NA_LIKE);
    sqlite3 *db;
    int rc = sqlite3_open_v2(dbname, &db, flags, 0);
    if(rc != SQLITE_OK) return sq_throwerror(v, "Failed to open database ! %d", rc);

    sq_sqlite3_sdb *sdb = (sq_sqlite3_sdb *)sq_malloc(sizeof(sq_sqlite3_sdb));
    memset(sdb, 0, sizeof(sq_sqlite3_sdb));
    sdb->db = db;
    sdb->v = v;
    sq_resetobject(&sdb->busy_cb);
    sq_resetobject(&sdb->busy_udata);
    sq_resetobject(&sdb->progress_cb);
    sq_resetobject(&sdb->progress_udata);
    sq_resetobject(&sdb->trace_cb);
    sq_resetobject(&sdb->trace_udata);
    sq_resetobject(&sdb->null_value);

    sq_setinstanceup(v, 1, sdb);
    sq_setreleasehook(v,1, sq_sqlite3_releasehook);

    //save a weakref to allow statement return it's db
    sq_pushuserpointer(v, sdb->db);
    sq_weakref(v, 1);
    sq_setonregistrytable(v);
    return 1;
}

static SQRESULT sq_sqlite3_close(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    if(sq_sqlite3_close_release(v, sdb) != SQ_OK) return SQ_ERROR;
    sq_setinstanceup(v, 1, 0); //next calls will fail with "database is closed"
    return 0;
}

static SQRESULT sq_sqlite3_db_ptr(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushuserpointer(v, self);
    return 1;
}

/* bool IsAutoCommitOn(  ) */
static SQRESULT sq_sqlite3_IsAutoCommitOn(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushbool(v, sqlite3_get_autocommit(self) ? SQTrue : SQFalse);
    return 1;
}

/* int changes(  ) */
static SQRESULT sq_sqlite3_changes(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushinteger(v, sqlite3_changes(self));
    return 1;
}

static SQRESULT sq_sqlite3_exec(HSQUIRRELVM v)
{
    return sqlite3_exec_fmt(v, tr_all_rows);
}

/* int exec_dml( const char * szSQL  ) */
static SQRESULT sq_sqlite3_exec_dml(HSQUIRRELVM v)
{
	SQ_FUNC_VARS_NO_TOP(v);
	GET_sqlite3_INSTANCE();
	SQ_GET_STRING(v, 2, szSQL);
	char *errmsg;
	if(sqlite3_exec(self, szSQL, NULL, NULL, &errmsg) != SQLITE_OK){
		sq_throwerror(v, errmsg);
		sqlite3_free(errmsg);
		return SQ_ERROR;
	}
	sq_pushinteger(v, sqlite3_changes(self));
    return 1;
}

/* bool exec_get_one( std::string & result  , const char * szSQL  ) */
static SQRESULT sq_sqlite3_exec_get_one(HSQUIRRELVM v)
{
    return sqlite3_exec_fmt(v, tr_first_row_first_col);
}

static SQRESULT sq_sqlite3_exec_get_first_row(HSQUIRRELVM v)
{
    return sqlite3_exec_fmt(v, tr_first_row);
}

/* const char * get_db_name(  ) */
static SQRESULT sq_sqlite3_get_db_name(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushstring(v, sqlite3_db_filename(self, "main"), -1);
    return 1;
}

/* sqlite3_int64 last_row_id(  ) */
static SQRESULT sq_sqlite3_last_row_id(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushinteger(v, sqlite3_last_insert_rowid(self));
    return 1;
}

/* stmt * prepare( const char * sql  ) */
static SQRESULT sq_sqlite3_prepare(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    //GET_sqlite3_INSTANCE();
    SQ_GET_STRING(v, 2, sql);
    sq_pushstring(v, SQLite3_Stmt_TAG, -1);
    if(sq_getonroottable(v) == SQ_ERROR) return SQ_ERROR;
    sq_pushroottable(v);
    sq_push(v, 1);
    sq_push(v, 2);
    if(sq_call(v, 3, SQTrue, SQFalse) != SQ_OK) return SQ_ERROR;
    return 1;
}

/* void set_busy_timeout( int nMillisecs  ) */
static SQRESULT sq_sqlite3_set_busy_timeout(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    //GET_sqlite3_INSTANCE();
    SQ_GET_INTEGER(v, 2, nMillisecs);
    //self->set_busy_timeout(nMillisecs);
    return 0;
}

/* int total_changes(  ) */
static SQRESULT sq_sqlite3_total_changes(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushinteger(v, sqlite3_total_changes(self));
    return 1;
}

static SQRESULT sq_sqlite3_enable_shared_cache(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    SQ_GET_BOOL(v, 2, bhow);
    sq_pushbool(v, sqlite3_enable_shared_cache(bhow) == SQLITE_OK);
    return 1;
}

static SQRESULT sq_sqlite3_sleep(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    SQ_GET_INTEGER(v, 2, n);
    sqlite3_sleep(n);
    return 0;
}

static SQRESULT sq_sqlite3_version(HSQUIRRELVM v)
{
    sq_pushstring(v, sqlite3_libversion(), -1);
    return 1;
}

static SQRESULT sq_sqlite3_errcode(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushinteger(v, sqlite3_errcode(self));
    return 1;
}

static SQRESULT sq_sqlite3_errmsg(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sq_pushstring(v, sqlite3_errmsg(self), -1);
    return 1;
}

#ifndef WIN32
static SQRESULT sq_sqlite3_temp_directory(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    const char *oldtemp = sqlite3_temp_directory;

    if (_top_ > 1)
    {
        SQ_GET_STRING(v, 2, temp);
        if (sqlite3_temp_directory)
        {
            sqlite3_free((char*)sqlite3_temp_directory);
        }
        if (temp && temp_size)
        {
            sqlite3_temp_directory = sqlite3_mprintf("%s", temp);
        }
        else
        {
            sqlite3_temp_directory = NULL;
        }
    }
    sq_pushstring(v, oldtemp, -1);
    return 1;
}
#endif

#ifdef SQLITE_HAS_CODEC

//#include "codecext.h"
/*
** Params: db, sql
** returns: code, compiled length or error message
*/
static SQRESULT sq_sqlite3_key(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    SQ_GET_STRING(v, 2, key);
    sq_pushinteger(v, sqlite3_key_v2(self, 0, key, key_size));
    return 1;
}

/*
** Params: db, sql
** returns: code, compiled length or error message
*/
static SQRESULT sq_sqlite3_rekey(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    SQ_GET_STRING(v, 2, key);
    sq_pushinteger(v, sqlite3_rekey_v2(self, 0, key, key_size));
    return 1;
}

#endif

#if !defined(SQLITE_OMIT_PROGRESS_CALLBACK) || !SQLITE_OMIT_PROGRESS_CALLBACK

/*
** progress handler:
** Params: database, number of opcodes, callback function, userdata
**
** callback function:
** Params: userdata
** returns: 0 to return immediatly and return SQLITE_ABORT, non-zero to continue
*/
static int db_progress_callback(void *user)
{
    SQInteger result = 1; /* abort by default */
    sq_sqlite3_sdb *sdb = (sq_sqlite3_sdb*)user;
    HSQUIRRELVM v = sdb->v;
    int top = sq_gettop(v);

    sq_pushobject(v, sdb->progress_cb);
    sq_pushroottable(v); //this
    sq_pushobject(v, sdb->progress_udata);

    /* call lua function */
    if (sq_call(v, 2, SQTrue, SQFalse) == SQ_OK)
        sq_getinteger(v, -1, &result);

    sq_settop(v, top);
    return result;
}

static SQRESULT sq_sqlite3_progress_handler(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_INSTANCE();

    if (_top_ < 2 || sq_gettype(v, 2) == OT_NULL)
    {
        sq_release(v, &sdb->progress_cb);
        sq_release(v, &sdb->progress_udata);

        sq_resetobject(&sdb->progress_cb);
        sq_resetobject(&sdb->progress_udata);

        /* clear busy handler */
        sqlite3_progress_handler(self, 0, NULL, NULL);
    }
    else
    {
        SQ_GET_INTEGER(v, 2, nop);
        if(sq_gettype(v, 3) != OT_CLOSURE)
            return sq_throwerror(v, _SC("invalid second parameter expected closure"));

        sq_getstackobj(v, 3, &sdb->progress_cb);
        sq_addref(v, &sdb->progress_cb);
        if(_top_ > 3)
        {
            sq_getstackobj(v, 4, &sdb->progress_udata);
            sq_addref(v, &sdb->progress_udata);
        }

        /* set progress callback */
        sqlite3_progress_handler(self, nop, db_progress_callback, sdb);
    }

    return 0;
}

#else /* #if !defined(SQLITE_OMIT_PROGRESS_CALLBACK) || !SQLITE_OMIT_PROGRESS_CALLBACK */

static SQRESULT sq_sqlite3_progress_handler(HSQUIRRELVM v)
{
    return sq_throwerror(v, _SC("progress callback support disabled at compile time"));
    return 0;
}

#endif /* #if !defined(SQLITE_OMIT_PROGRESS_CALLBACK) || !SQLITE_OMIT_PROGRESS_CALLBACK */

/*
** trace callback:
** Params: database, callback function, userdata
**
** callback function:
** Params: userdata, sql
*/
static void db_trace_callback(void *user, const char *sql)
{
    sq_sqlite3_sdb *sdb = (sq_sqlite3_sdb*)user;
    HSQUIRRELVM v = sdb->v;
    int top = sq_gettop(v);

    /* setup squirrel callback call */
    sq_pushobject(v, sdb->trace_cb);
    sq_pushroottable(v);
    sq_pushobject(v, sdb->trace_udata);
    sq_pushstring(v, sql, -1); /* traced sql statement */

    /* call squirrel function */
    sq_call(v, 3, SQFalse, SQFalse);
    /* ignore any error generated by this function */

    sq_settop(v, top);
}

static SQRESULT sq_sqlite3_trace(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_INSTANCE();

    if (_top_ < 2 || sq_gettype(v, 2) == OT_NULL)
    {
        sq_release(v, &sdb->trace_cb);
        sq_release(v, &sdb->trace_udata);

        sq_resetobject(&sdb->trace_cb);
        sq_resetobject(&sdb->trace_udata);

        /* clear trace handler */
        sqlite3_trace(self, NULL, NULL);
    }
    else
    {
        if(sq_gettype(v, 2) != OT_CLOSURE)
            return sq_throwerror(v, _SC("invalid fisrt parameter expected closure"));

        sq_getstackobj(v, 2, &sdb->trace_cb);
        sq_addref(v, &sdb->trace_cb);
        if(_top_ > 2)
        {
            sq_getstackobj(v, 3, &sdb->trace_udata);
            sq_addref(v, &sdb->trace_udata);
        }

        /* set trace callback */
        sqlite3_trace(self, db_trace_callback, sdb);
    }

    return 0;
}

/*
** busy handler:
** Params: database, callback function, userdata
**
** callback function:
** Params: userdata, number of tries
** returns: 0 to return immediatly and return SQLITE_BUSY, non-zero to try again
*/
static int db_busy_callback(void *user, int tries)
{
    SQBool retry = SQFalse; /* abort by default */
    sq_sqlite3_sdb *sdb = (sq_sqlite3_sdb*)user;
    HSQUIRRELVM v = sdb->v;
    int top = sq_gettop(v);

    sq_pushobject(v, sdb->busy_cb);
    sq_pushroottable(v);
    sq_pushobject(v, sdb->busy_udata);
    sq_pushinteger(v, tries);

    /* call lua function */
    if (sq_call(v, 3, SQTrue, SQFalse) == SQ_OK)
        sq_getbool(v, -1, &retry);

    sq_settop(v, top);
    return retry == SQTrue;
}

static SQRESULT sq_sqlite3_busy_handler(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_INSTANCE();

    if (_top_ < 2 || sq_gettype(v, 2) == OT_NULL)
    {
        sq_release(v, &sdb->busy_cb);
        sq_release(v, &sdb->busy_udata);

        sq_resetobject(&sdb->busy_cb);
        sq_resetobject(&sdb->busy_udata);

        /* clear busy handler */
        sqlite3_busy_handler(self, NULL, NULL);
    }
    else
    {
        if(sq_gettype(v, 2) != OT_CLOSURE)
            return sq_throwerror(v, _SC("invalid fisrt parameter expected closure"));

        sq_getstackobj(v, 2, &sdb->busy_cb);
        sq_addref(v, &sdb->busy_cb);
        if(_top_ > 2)
        {
            sq_getstackobj(v, 3, &sdb->busy_udata);
            sq_addref(v, &sdb->busy_udata);
        }

        /* set busy callback */
        sqlite3_busy_handler(self, db_busy_callback, sdb);
    }

    return 0;
}

static SQRESULT sq_sqlite3_busy_timeout(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    SQ_GET_INTEGER(v, 2, timeout);

    sqlite3_busy_timeout(self, timeout);

    /* if there was a timeout callback registered, it is now
    ** invalid/useless. free any references we may have */
    sq_release(v, &sdb->busy_cb);
    sq_resetobject(&sdb->busy_cb);
    sq_release(v, &sdb->busy_udata);
    sq_resetobject(&sdb->busy_udata);

    return 0;
}

static SQRESULT sq_sqlite3_interrupt(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_INSTANCE();
    sqlite3_interrupt(self);
    return 0;
}

/*
** =======================================================
** User Defined Functions - Context Methods
** =======================================================
*/
typedef struct
{
    sqlite3_context *ctx;
    HSQOBJECT udata;
} sq_sqlite3_context_st;

static const SQChar sq_sqlite3_context_TAG[]  = _SC(":sqlite3:ctx");

static SQRESULT sq_sqlite3_context_releasehook(SQUserPointer p, SQInteger size, HSQUIRRELVM v)
{
    sq_sqlite3_context_st *ctx = ((sq_sqlite3_context_st *)p);
    /* 'free' all references */
    sq_free(ctx, sizeof(sq_sqlite3_context_st));
    return 0;
}

static SQRESULT sq_sqlite3_context_constructor(HSQUIRRELVM v)
{
    sq_sqlite3_context_st *ctx = (sq_sqlite3_context_st*)sq_malloc(sizeof(sq_sqlite3_context_st));
    ctx->ctx = NULL;
    sq_resetobject(&ctx->udata);
    sq_setinstanceup(v, 1, ctx);
    sq_setreleasehook(v,1, sq_sqlite3_context_releasehook);
    return 1;
}

#define SQ_SQLITE3_GETCONTEXT(v, idx) \
    sq_sqlite3_context_st *self;\
    if((_rc_ = sq_getinstanceup(v, idx, (void**)&self, (void*)sq_sqlite3_context_TAG)) < 0) return _rc_;

#define GET_sqlite3_context_INSTANCE() SQ_SQLITE3_GETCONTEXT(v,1)

static SQRESULT sq_sqlite3_context__tostring(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    char buff[64];
    snprintf(buff, sizeof(buff), "sqlite function context (%p)", self);
    sq_pushstring(v, buff, -1);
    return 1;
}

static SQRESULT sq_sqlite3_context_check_aggregate(HSQUIRRELVM v, sq_sqlite3_context_st *ctx)
{
    sq_sqlite3_sdb_func *func = (sq_sqlite3_sdb_func*)sqlite3_user_data(ctx->ctx);
    if (sq_isclosure(func->fn_finalize))
    {
        return sq_throwerror(v, "attempt to call aggregate method from scalar function");
    }
    return 1;
}

static SQRESULT sq_sqlite3_context_user_data(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    sq_sqlite3_sdb_func *func = (sq_sqlite3_sdb_func*)sqlite3_user_data(self->ctx);
    sq_pushobject(v, func->udata);
    return 1;
}

static SQRESULT sq_sqlite3_context_aggregate_data(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_context_INSTANCE();
    sq_sqlite3_context_check_aggregate(v, self);
    if(_top_ < 2)
    {
        sq_pushobject(v, self->udata);
    }
    else
    {
        sq_release(v, &self->udata);
        sq_getstackobj(v, 2, &self->udata);
        sq_addref(v, &self->udata);
    }
    return 0;
}

static SQRESULT sq_sqlite3_context_aggregate_count(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    sq_sqlite3_context_check_aggregate(v, self);
    sq_pushinteger(v, sqlite3_aggregate_count(self->ctx));
    return 1;
}

#if 0
void *sqlite3_get_auxdata(sqlite3_context*, int);
void sqlite3_set_auxdata(sqlite3_context*, int, void*, void (*)(void*));
#endif

static SQRESULT sq_sqlite3_context_result_blob(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    SQ_GET_STRING(v, 2, blob);
    sqlite3_result_blob(self->ctx, (const void*)blob, blob_size, SQLITE_TRANSIENT);
    return 0;
}

static SQRESULT sq_sqlite3_context_result_double(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    SQ_GET_FLOAT(v, 2, d);
    sqlite3_result_double(self->ctx, d);
    return 0;
}

static SQRESULT sq_sqlite3_context_result_error(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    SQ_GET_STRING(v,2, err);
    sqlite3_result_error(self->ctx, err, err_size);
    return 0;
}

static SQRESULT sq_sqlite3_context_result_int(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    SQ_GET_INTEGER(v, 2, i);
    sqlite3_result_int(self->ctx, i);
    return 0;
}

static SQRESULT sq_sqlite3_context_result_null(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    sqlite3_result_null(self->ctx);
    return 0;
}

static SQRESULT sq_sqlite3_context_result_text(HSQUIRRELVM v)
{
    SQ_FUNC_VARS_NO_TOP(v);
    GET_sqlite3_context_INSTANCE();
    SQ_GET_STRING(v, 2, text);
    sqlite3_result_text(self->ctx, text, text_size, SQLITE_TRANSIENT);
    return 0;
}

#define _DECL_FUNC(name,nparams,tycheck) {_SC(#name),  sq_sqlite3_context_##name,nparams,tycheck}
static SQRegFunction sq_sqlite3_context_methods[] =
{
    _DECL_FUNC(constructor,  1, _SC("x")),

    _DECL_FUNC(user_data,  1, _SC("x")),
    _DECL_FUNC(aggregate_data,  -1, _SC("x.")),
    _DECL_FUNC(aggregate_count,  1, _SC("x")),
    _DECL_FUNC(result_null,  1, _SC("x")),
    _DECL_FUNC(result_double,  2, _SC("xn")),
    _DECL_FUNC(result_int,  2, _SC("xi")),
    _DECL_FUNC(result_text,  2, _SC("xs")),
    _DECL_FUNC(result_blob,  2, _SC("xs")),
    _DECL_FUNC(result_error,  2, _SC("xs")),
    _DECL_FUNC(_tostring,  -1, _SC("x")),
    {0,0}
};
#undef _DECL_FUNC

/*
** callback functions used when calling registered sql functions
*/

static void sqlite3_push_value(HSQUIRRELVM v, sqlite3_value *value)
{
    const char *tmp_value;
    switch (sqlite3_value_type(value))
    {
    case SQLITE_TEXT:
        tmp_value = (const char*) sqlite3_value_text(value);
        if(tmp_value) sq_pushstring(v, tmp_value, sqlite3_value_bytes(value));
        else push_sqlite3_null(v);
        break;

    case SQLITE_INTEGER:
    {
        sqlite_int64 i64 = sqlite3_value_int64(value);
        SQInteger n = (SQInteger)i64;
        if (n == i64)
            sq_pushinteger(v, n);
        else
            sq_pushstring(v, (const char*) sqlite3_value_text(value), sqlite3_value_bytes(value));
    }
    break;

    case SQLITE_FLOAT:
        sq_pushfloat(v, sqlite3_value_double(value));
        break;

    case SQLITE_BLOB:
        tmp_value = (const char*) sqlite3_value_blob(value);
        if(tmp_value) sq_pushstring(v, tmp_value, sqlite3_value_bytes(value));
        else push_sqlite3_null(v);
        break;

    case SQLITE_NULL:
        push_sqlite3_null(v);
        break;

    default:
        /* things done properly (SQLite + Lua SQLite)
        ** this should never happen */
        push_sqlite3_null(v);
        break;
    }
}
//#if 0

static SQRESULT new_context_instance(HSQUIRRELVM v, sq_sqlite3_context_st **ctx)
{
    sq_pushregistrytable(v);
    sq_pushstring(v,_SC("sqite3_context"),-1);
    int rc = sq_rawget(v, -2);
    sq_remove(v, -2); //remove registrytable
    sq_pushroottable(v);
    rc = sq_call(v, 1, SQTrue, SQFalse);
    sq_remove(v, -2); //class
    rc = sq_getinstanceup(v, -1, (void**)ctx, (void*)sq_sqlite3_context_TAG);
    return rc;
}
/* scalar function to be called
** callback params: context, values... */
static void db_sql_normal_function(sqlite3_context *context, int argc, sqlite3_value **argv)
{
    sq_sqlite3_sdb_func *func = (sq_sqlite3_sdb_func*)sqlite3_user_data(context);
    HSQUIRRELVM v = func->sdb->v;

    int n;
    sq_sqlite3_context_st *ctx;
    int top = sq_gettop(v);

    /* ensure there is enough space in the stack */
    sq_reservestack(v, argc + 5);

    sq_pushobject(v, func->fn_step);
    sq_pushroottable(v);

    if (!sq_isclosure(func->fn_finalize))
    {
        new_context_instance(v, &ctx);
    }
    else
    {
        /* reuse context userdata value */
        void *p = sqlite3_aggregate_context(context, 1);
        /* i think it is OK to use assume that using a light user data
        ** as an entry on LUA REGISTRY table will be unique */
        sq_pushregistrytable(v);
        sq_pushuserpointer(v, p);
        /* context table */
        if(sq_rawget(v, -2) != SQ_OK)
        {
            /* not yet created? */
            sq_poptop(v); //remove null
            new_context_instance(v, &ctx);
            sq_pushuserpointer(v, p);
            sq_push(v, -2);
            sq_rawset(v, -4); //insert into registrytable
        }
        sq_remove(v, -2); //remove registrytable
    }

    /* push params */
    for (n = 0; n < argc; ++n)
    {
        sqlite3_push_value(v, argv[n]);
    }

    /* set context */
    ctx->ctx = context;

    if (sq_call(v, argc + 2, SQFalse, SQFalse) != SQ_OK)   //2 = roottable + ctx
    {
        sqlite3_result_error(context, sq_getlasterror_str(v), -1);
    }

    /* invalidate context */
    ctx->ctx = NULL;

    if (!sq_isclosure(func->fn_finalize))
    {
        sq_release(v, &ctx->udata);
        sq_resetobject(&ctx->udata);
    }

    sq_settop(v, top);
}

static void db_sql_finalize_function(sqlite3_context *context)
{
    sq_sqlite3_sdb_func *func = (sq_sqlite3_sdb_func*)sqlite3_user_data(context);
    HSQUIRRELVM v = func->sdb->v;
    void *p = sqlite3_aggregate_context(context, 1); /* minimal mem usage */
    sq_sqlite3_context_st *ctx;
    int top = sq_gettop(v);

    sq_pushobject(v, func->fn_finalize);
    sq_pushroottable(v);

    /* i think it is OK to use assume that using a light user data
    ** as an entry on LUA REGISTRY table will be unique */
    sq_pushregistrytable(v);
    sq_pushuserpointer(v, p);
    /* remove it from registry but we'll use it last time here */
    /* context table */
    if(sq_deleteslot(v, -2, SQTrue) != SQ_OK)
    {
        /* not yet created? - shouldn't happen in finalize function */
        sq_pop(v, 1);
        new_context_instance(v, &ctx);
        sq_pushuserpointer(v, p);
        sq_push(v, -2);
        sq_rawset(v, -4);
    }
    sq_remove(v, -2); //registrytable

    /* set context */
    ctx->ctx = context;

    if (sq_call(v, 1, SQFalse, SQFalse) != SQ_OK)
    {
        sqlite3_result_error(context, sq_getlasterror_str(v), -1);
    }

    /* invalidate context */
    ctx->ctx = NULL;

    /* cleanup context */
    sq_release(v, &ctx->udata);
    sq_resetobject(&ctx->udata);
    sq_settop(v, top);
}

/*
** Register a normal function
** Params: db, function name, number arguments, [ callback | step, finalize], user data
** Returns: true on sucess
**
** Normal function:
** Params: context, params
**
** Aggregate function:
** Params of step: context, params
** Params of finalize: context
*/
static SQRESULT db_register_function(HSQUIRRELVM v, int aggregate)
{
    SQ_FUNC_VARS(v);
    SQInteger ftype = 0;
    GET_sqlite3_INSTANCE();
    SQ_GET_STRING(v, 2, name);
    SQ_GET_INTEGER(v, 3, nargs);
    if(sq_gettype(v, 4) != OT_CLOSURE)
        return sq_throwerror(v, "invalid parameter 3 expected closure");
    if (aggregate)
    {
        if(sq_gettype(v,5) != OT_CLOSURE)
            return sq_throwerror(v, "invalid parameter 4 expected closure");
    } else {
        sq_optinteger(v, 5, &ftype, 0);
    }

    sq_sqlite3_sdb_func *func;
    /* maybe an alternative way to allocate memory should be used/avoided */
    func = (sq_sqlite3_sdb_func*)sq_malloc(sizeof(sq_sqlite3_sdb_func));
    memset(func, 0, sizeof(sq_sqlite3_sdb_func));
    _rc_ = sqlite3_create_function(
               self, name, nargs, SQLITE_UTF8 | (ftype == SQLITE_DETERMINISTIC ? ftype : 0),
                func,
               aggregate ? NULL : db_sql_normal_function,
               aggregate ? db_sql_normal_function : NULL,
               aggregate ? db_sql_finalize_function : NULL
           );

    if (_rc_ == SQLITE_OK)
    {
        /* save registered function in db function list */
        func->sdb = sdb;
        func->next = sdb->func;
        sdb->func = func;

        /* save the setp/normal function callback */
        sq_resetobject(&func->fn_step);
        sq_getstackobj(v, 4, &func->fn_step);
        sq_addref(v, &func->fn_step);
        /* save the finalize function callback */
        sq_resetobject(&func->fn_finalize);
        if (aggregate)
        {
            sq_getstackobj(v, 5, &func->fn_finalize);
            sq_addref(v, &func->fn_finalize);
        }

        /* save user data */
        sq_resetobject(&func->udata);
        int udata_idx = aggregate ? 6 : 5;
        if(_top_ >= udata_idx)
        {
            sq_getstackobj(v, udata_idx, &func->udata);
            sq_addref(v, &func->udata);
        }
    }
    else
    {
        /* free allocated memory */
        sq_free(func, sizeof(sq_sqlite3_sdb_func));
    }

    sq_pushbool(v, _rc_ == SQLITE_OK ? 1 : 0);
    return 1;
}
//#endif

static SQRESULT sq_sqlite3_create_function(HSQUIRRELVM v)
{
    return db_register_function(v, 0);
}

static SQRESULT sq_sqlite3_create_aggregate(HSQUIRRELVM v)
{
    return db_register_function(v, 1);
}

static SQRESULT sq_sqlite3_backup(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_INSTANCE();
    SQ_GET_STRING(v, 2, fname);
    SQ_OPT_STRING(v, 3, dbname, _SC("main"));

    sqlite3 *pDest;
    sqlite3_backup *pBackup;

    int rc = sqlite3_open(fname, &pDest);
    if(rc!=SQLITE_OK)
    {
        sqlite3_close(pDest);
        return sq_throwerror(v, _SC("SQLite can't open %s"), fname);
    }

    pBackup = sqlite3_backup_init(pDest, "main", self, dbname);
    if( pBackup==0 ){
        rc = sq_throwerror(v, _SC("Error: %s\n"), sqlite3_errmsg(pDest));
        sqlite3_close(pDest);
    }
    while(  (rc = sqlite3_backup_step(pBackup,100))==SQLITE_OK ){}
    sqlite3_backup_finish(pBackup);
    if( rc==SQLITE_DONE ){
        rc = SQ_OK;
    }else{
        rc = sq_throwerror(v, _SC("Error: %s\n"), sqlite3_errmsg(pDest));
    }
    sqlite3_close(pDest);

    return rc;
}

static SQRESULT sq_sqlite3_restore(HSQUIRRELVM v)
{
    SQ_FUNC_VARS(v);
    GET_sqlite3_INSTANCE();
    SQ_GET_STRING(v, 2, fname);
    SQ_OPT_STRING(v, 3, dbname, _SC("main"));

    sqlite3 *pSrc;
    sqlite3_backup *pBackup;
    int nTimeout = 0;

    int rc = sqlite3_open(fname, &pSrc);
    if(rc!=SQLITE_OK)
    {
        sqlite3_close(pSrc);
        return sq_throwerror(v, _SC("SQLite can't open %s"), fname);
    }

    pBackup = sqlite3_backup_init(self, "main", pSrc, dbname);
    if( pBackup==0 ){
        sqlite3_close(pSrc);
        return sq_throwerror(v, _SC("Error: %s\n"), sqlite3_errmsg(self));
    }
    while( (rc = sqlite3_backup_step(pBackup,100))==SQLITE_OK
          || rc==SQLITE_BUSY  ){
      if( rc==SQLITE_BUSY ){
        if( nTimeout++ >= 3 ) break;
        sqlite3_sleep(100);
      }
    }

    sqlite3_backup_finish(pBackup);
    if( rc==SQLITE_DONE ){
        rc = SQ_OK;
    }else if( rc==SQLITE_BUSY || rc==SQLITE_LOCKED ){
        rc = sq_throwerror(v, _SC("Error: source database is busy\n"));
    }else{
        rc = sq_throwerror(v, _SC("Error: %s\n"), sqlite3_errmsg(self));
    }
    sqlite3_close(pSrc);

    return rc;
}


#define _DECL_FUNC(name,nparams,tycheck) {_SC(#name),  sq_sqlite3_##name,nparams,tycheck}
static SQRegFunction sq_sqlite3_methods[] =
{
    _DECL_FUNC(constructor,  -2, _SC("xsi")),
    _DECL_FUNC(close,  1, _SC("x")),
    _DECL_FUNC(db_ptr,  1, _SC("x")),

    _DECL_FUNC(IsAutoCommitOn,  1, _SC("x")),
    _DECL_FUNC(version,  1, _SC("x")),
    _DECL_FUNC(errcode,  1, _SC("x")),
    _DECL_FUNC(errmsg,  1, _SC("x")),
    _DECL_FUNC(sleep,  1, _SC("x")),
    _DECL_FUNC(interrupt,  1, _SC("x")),
    _DECL_FUNC(progress_handler,  -2, _SC("x i|o c .")),
    _DECL_FUNC(trace,  -2, _SC("x c|o .")),
    _DECL_FUNC(busy_handler,  -2, _SC("x c|o .")),
    _DECL_FUNC(busy_timeout,  2, _SC("xi")),
    _DECL_FUNC(create_function,  -4, _SC("xsic.")),
    _DECL_FUNC(create_aggregate,  -5, _SC("xsicc.")),
#ifndef WIN32
    _DECL_FUNC(temp_directory,  2, _SC("xs")),
#endif
    _DECL_FUNC(enable_shared_cache,  2, _SC("xb")),
    _DECL_FUNC(changes,  1, _SC("x")),
    _DECL_FUNC(exec,  -2, _SC("xs")),
    _DECL_FUNC(exec_dml,  2, _SC("xs")),
    _DECL_FUNC(exec_get_first_row,  2, _SC("xs")),
    _DECL_FUNC(exec_get_one,  2, _SC("xs")),
    _DECL_FUNC(get_db_name,  1, _SC("x")),
    _DECL_FUNC(last_row_id,  1, _SC("x")),
    _DECL_FUNC(prepare,  2, _SC("xs")),
    _DECL_FUNC(set_busy_timeout,  -1, _SC("xi")),
    _DECL_FUNC(total_changes,  1, _SC("x")),
    _DECL_FUNC(backup,  -2, _SC("xss")),
    _DECL_FUNC(restore,  -2, _SC("xss")),
#ifdef SQLITE_HAS_CODEC
    _DECL_FUNC(key,  2, _SC("xs")),
    _DECL_FUNC(rekey,  2, _SC("xs")),
#endif
    {0,0}
};

#undef _DECL_FUNC

#define INT_CONST(v,num) 	sq_pushstring(v,_SC(#num),-1);sq_pushinteger(v,num);sq_newslot(v,-3,SQTrue);



#ifdef __cplusplus
extern "C" {
#endif

    SQRESULT sqext_register_SQLite3(HSQUIRRELVM v)
    {
        sq_insertfunc(v, _SC("sle2vecOfvec"), sq_sle2vecOfvec, -2, _SC(". s|x a i"), SQTrue);
        sq_insertfunc(v, _SC("get_sle_size"), sq_get_sle_size, -2, _SC(".i"), SQTrue);
        sq_insertfunc(v, _SC("add2sle"), sq_add2sle, -3, _SC(".xsi"), SQTrue);
        sq_pushconsttable(v);
#define INT_SLE_CONST(num) 	sq_pushstring(v,_SC("SLE_" #num),-1);sq_pushinteger(v,num);sq_newslot(v,-3,SQTrue);
        INT_SLE_CONST(IBYTE1);
        INT_SLE_CONST(IBYTE2);
        INT_SLE_CONST(IBYTE3);
        INT_SLE_CONST(IBYTE4);
        INT_SLE_CONST(SIZE1BYTE);
        INT_SLE_CONST(SIZE2BYTE);
        INT_SLE_CONST(SIZE3BYTE);
        INT_SLE_CONST(SIZE4BYTE);
        INT_SLE_CONST(SLEMARK);
        INT_SLE_CONST(SLEEND);

        sq_poptop(v); //remove const table


        HSQOBJECT sqlite3_NULL;
        sq_pushregistrytable(v);
        sq_pushstring(v, sqlite3_NULL_Name,-1);
        sq_newuserdata(v, sizeof(void*));
        sq_resetobject(&sqlite3_NULL);
        sq_getstackobj(v, -1, &sqlite3_NULL);
        sq_newtable(v);
        sq_insert_reg_funcs(v, sqlite3_NULL_methods);
        sq_setdelegate(v, -2);
        sq_newslot(v,-3,SQTrue);

        sq_pushstring(v,_SC("sqite3_context"),-1);
        sq_newclass(v,SQFalse);
        sq_settypetag(v,-1,(void*)sq_sqlite3_context_TAG);
        sq_insert_reg_funcs(v, sq_sqlite3_context_methods);
        sq_newslot(v,-3,SQTrue);

        sq_poptop(v); //remove registrytable

        sq_pushstring(v,SQLite3_TAG,-1);
        sq_newclass(v,SQFalse);
        sq_settypetag(v,-1,(void*)SQLite3_TAG);
        sq_insert_reg_funcs(v, sq_sqlite3_methods);

        INT_CONST(v,SQLITE_OPEN_CREATE);
        INT_CONST(v,SQLITE_OPEN_READWRITE);
        INT_CONST(v,SQLITE_OPEN_SHAREDCACHE);
        INT_CONST(v,SQLITE_OPEN_SUBLATIN_NA_LIKE);

        INT_CONST(v,SQLITE_OK);
        INT_CONST(v,SQLITE_BUSY);
        INT_CONST(v,SQLITE_DONE);
        INT_CONST(v,SQLITE_DETERMINISTIC);
        INT_CONST(v,SQLITE_ERROR);
        INT_CONST(v,SQLITE_INTERRUPT);
        INT_CONST(v,SQLITE_MISUSE);
        INT_CONST(v,SQLITE_ROW);
        INT_CONST(v,SQLITE_LOCKED_SHAREDCACHE);
        INT_CONST(v,SQLITE_BUSY_RECOVERY);
        INT_CONST(v,SQLITE_BUSY_SNAPSHOT);
        INT_CONST(v,SQLITE_CANTOPEN_NOTEMPDIR);
        INT_CONST(v,SQLITE_CANTOPEN_ISDIR);
        INT_CONST(v,SQLITE_CANTOPEN_FULLPATH);
        INT_CONST(v,SQLITE_CANTOPEN_CONVPATH);
        INT_CONST(v,SQLITE_CORRUPT_VTAB);
        INT_CONST(v,SQLITE_READONLY_RECOVERY);
        INT_CONST(v,SQLITE_READONLY_CANTLOCK);
        INT_CONST(v,SQLITE_READONLY_ROLLBACK);
        INT_CONST(v,SQLITE_READONLY_DBMOVED);
        INT_CONST(v,SQLITE_ABORT_ROLLBACK);
        INT_CONST(v,SQLITE_CONSTRAINT_CHECK);
        INT_CONST(v,SQLITE_CONSTRAINT_COMMITHOOK);
        INT_CONST(v,SQLITE_CONSTRAINT_FOREIGNKEY);
        INT_CONST(v,SQLITE_CONSTRAINT_FUNCTION);
        INT_CONST(v,SQLITE_CONSTRAINT_NOTNULL);
        INT_CONST(v,SQLITE_CONSTRAINT_PRIMARYKEY);
        INT_CONST(v,SQLITE_CONSTRAINT_TRIGGER);
        INT_CONST(v,SQLITE_CONSTRAINT_UNIQUE);
        INT_CONST(v,SQLITE_CONSTRAINT_VTAB);
        INT_CONST(v,SQLITE_CONSTRAINT_ROWID);
        INT_CONST(v,SQLITE_NOTICE_RECOVER_WAL);
        INT_CONST(v,SQLITE_NOTICE_RECOVER_ROLLBACK);
        INT_CONST(v,SQLITE_WARNING_AUTOINDEX);
        //push sqlite3_NULL as a member
        sq_pushstring(v, nullName,-1);
        sq_pushobject(v, sqlite3_NULL);
        sq_newslot(v,-3,SQTrue);

        sq_newslot(v,-3,SQTrue);

        sq_pushstring(v, SQLite3_Stmt_TAG,-1);
        sq_newclass(v,SQFalse);
        sq_settypetag(v,-1,(void*)SQLite3_Stmt_TAG);
        sq_insert_reg_funcs(v, sq_sqlite3_stmt_methods);

        INT_CONST(v,SQLITE_OK);
        INT_CONST(v,SQLITE_DONE);
        INT_CONST(v,SQLITE_ROW);
        INT_CONST(v,AS_STRING_ALWAYS);
        INT_CONST(v,NULL_AS_EMPTY_STR);
        INT_CONST(v,WITH_COL_NAMES);

        //push sqlite3_NULL as a member
        sq_pushstring(v, nullName,-1);
        sq_pushobject(v, sqlite3_NULL);
        sq_newslot(v,-3,SQTrue);

        sq_newslot(v,-3,SQTrue);
        return 1;
    }

#ifdef __cplusplus
}
#endif