modules_k/sqlops: sql_query(): make result parameter optional

No need to specify a result parameter for SQL statements that do not return
a resultset, so make it optional.

modules_k/sqlops/doc/sqlops_admin.xml

@@ -179,7 +179,7 @@ modparam("sqlops", "sqlres", "ra")
 	<title>Exported Functions</title>
 	<section>
 		<title>
-		<function moreinfo="none">sql_query(connection, query, result)</function>
+		<function moreinfo="none">sql_query(connection, query[, result])</function>
 		</title>
 		<para>
 			Make a SQL query using 'connection' and store data in 'result'.
@@ -201,6 +201,8 @@ modparam("sqlops", "sqlres", "ra")
 				<emphasis>result</emphasis> - string name to identify the
 				result. Will be used by $dbr(...) pseudo-variable to access
 				result attributes.
+				If omitted, any resultset will be discarded. The result parameter should
+				normally only be omitted when no result is expected (INSERT, UPDATE, DELETE).
 			</para>
 		</listitem>
 		</itemizedlist>

modules_k/sqlops/sql_api.c

@@ -208,7 +208,6 @@ int sql_do_query(sql_con_t *con, str *query, sql_result_t *res)
 		LM_ERR("bad parameters\n");
 		return -1;
 	}
-	sql_reset_result(res);
 	if(con->dbf.raw_query(con->dbh, query, &db_res)!=0)
 	{
 		LM_ERR("cannot do the query\n");
@@ -221,6 +220,14 @@ int sql_do_query(sql_con_t *con, str *query, sql_result_t *res)
 		con->dbf.free_result(con->dbh, db_res);
 		return 2;
 	}
+	if(!res)
+	{
+		LM_DBG("no sqlresult parameter, ignoring result from query\n");
+		con->dbf.free_result(con->dbh, db_res);
+		return 3;
+	}
+
+	sql_reset_result(res);
 	res->ncols = RES_COL_N(db_res);
 	res->nrows = RES_ROW_N(db_res);
 	LM_DBG("rows [%d] cols [%d]\n", res->nrows, res->ncols);

modules_k/sqlops/sqlops.c

@@ -60,6 +60,7 @@ static int bind_sqlops(sqlops_api_t* api);
 
 /** module functions */
 static int sql_query(struct sip_msg*, char*, char*, char*);
+static int sql_query2(struct sip_msg*, char*, char*);
 #ifdef WITH_XAVP
 static int sql_xquery(struct sip_msg *msg, char *dbl, char *query, char *res);
 #endif
@@ -86,6 +87,9 @@ static cmd_export_t cmds[]={
 	{"sql_query",  (cmd_function)sql_query, 3, fixup_sql_query, 0, 
 		REQUEST_ROUTE | FAILURE_ROUTE |
 		ONREPLY_ROUTE | BRANCH_ROUTE | LOCAL_ROUTE},
+	{"sql_query",  (cmd_function)sql_query2, 2, fixup_sql_query, 0, 
+		REQUEST_ROUTE | FAILURE_ROUTE |
+		ONREPLY_ROUTE | BRANCH_ROUTE | LOCAL_ROUTE},
 #ifdef WITH_XAVP
 	{"sql_xquery",  (cmd_function)sql_xquery, 3, fixup_sql_xquery, 0, 
 		REQUEST_ROUTE | FAILURE_ROUTE |
@@ -192,6 +196,11 @@ static int sql_query(struct sip_msg *msg, char *dbl, char *query, char *res)
 	return sql_do_query((sql_con_t*)dbl, &sq, (sql_result_t*)res);
 }
 
+static int sql_query2(struct sip_msg *msg, char *dbl, char *query)
+{
+	return sql_query(msg, dbl, query, NULL);
+}
+
 #ifdef WITH_XAVP
 /**
  *