kamailio.cfg: db_url parameters are set via defined DBURL ID

- one value to be updated in order to change DB connectivity URL, i.e.,

 #!define DBURL "mysql://openser:openserrw@localhost/openser"
 modparam("xyz", "db_url", DBURL)

etc/kamailio.cfg

@@ -64,6 +64,12 @@
   ALTER TABLE missed_calls ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT '';
 #!endif
 
+# *** Value defines - IDs used later in config
+#!ifdef WITH_MYSQL
+# - database URL - used to connect to database server by modules such
+#       as: auth_db, acc, usrloc, a.s.o.
+#!define DBURL "mysql://openser:openserrw@localhost/openser"
+#!endif
 
 ####### Global Parameters #########
 
@@ -228,8 +234,7 @@ modparam("acc", "log_extra",
 #!ifdef WITH_ACCDB
 modparam("acc", "db_flag", 1)
 modparam("acc", "db_missed_flag", 2)
-modparam("acc", "db_url",
-	"mysql://openser:openserrw@localhost/openser")
+modparam("acc", "db_url", DBURL)
 modparam("acc", "db_extra",
 	"src_user=$fU;src_domain=$fd;dst_ouser=$tU;dst_user=$rU;dst_domain=$rd")
 #!endif
@@ -237,9 +242,8 @@ modparam("acc", "db_extra",
 # ----- usrloc params -----
 /* enable DB persistency for location entries */
 #!ifdef WITH_USRLOCDB
-modparam("usrloc", "db_mode",   2)
-modparam("usrloc", "db_url",
-	"mysql://openser:openserrw@localhost/openser")
+modparam("usrloc", "db_mode", 2)
+modparam("usrloc", "db_url", DBURL)
 #!endif
 
 # ----- auth_db params -----
@@ -247,13 +251,11 @@ modparam("usrloc", "db_url",
 #!ifdef WITH_AUTH
 modparam("auth_db", "calculate_ha1", yes)
 modparam("auth_db", "password_column", "password")
-modparam("auth_db", "db_url",
-	"mysql://openser:openserrw@localhost/openser")
+modparam("auth_db", "db_url", DBURL)
 modparam("auth_db", "load_credentials", "")
 
 #!ifdef WITH_IPAUTH
-modparam("permissions", "db_url",
-	"mysql://openser:openserrw@localhost/openser")
+modparam("permissions", "db_url", DBURL)
 modparam("permissions", "db_mode", 1)
 #!endif
 
@@ -262,15 +264,13 @@ modparam("permissions", "db_mode", 1)
 # ----- alias_db params -----
 /* uncomment the following lines if you want to enable the DB based
    aliases */
-#modparam("alias_db", "db_url",
-#	"mysql://openser:openserrw@localhost/openser")
+#modparam("alias_db", "db_url", DBURL)
 
 
 # ----- domain params -----
 /* uncomment the following lines to enable multi-domain detection
    support */
-#modparam("domain", "db_url",
-#	"mysql://openser:openserrw@localhost/openser")
+#modparam("domain", "db_url", DBURL)
 #modparam("domain", "db_mode", 1)   # Use caching
 
 
@@ -283,8 +283,7 @@ modparam("permissions", "db_mode", 1)
 # ----- presence params -----
 /* enable presence server support */
 #!ifdef WITH_PRESENCE
-modparam("presence|presence_xml", "db_url",
-	"mysql://openser:openserrw@localhost/openser")
+modparam("presence|presence_xml", "db_url", DBURL)
 modparam("presence_xml", "force_active", 1)
 modparam("presence", "server_address", "sip:10.0.0.10:5060")
 #!endif