[SR-Users] PostgreSQL - module sqlops - working with prepared statements ?

[Henning Westerholt]

Hello,

the sqlops module only support "standard SQL" queries from the configuration. And practically speaking, if you are executing your query against a remote server, the network overhead will probably substancially higher than parsing the SQL statement on the server. So, I do not think there is actually a big benefit for using this.

If you need the last bit of performance, you could always implement a C module and implement it there. From my experience you will gain most with statement batching, especially for write operations.

Cheers,

Henning

--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://gilawa.com<https://gilawa.com/>

From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Chaigneau, Nicolas
Sent: Tuesday, April 19, 2022 6:25 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] PostgreSQL - module sqlops - working with prepared statements ?

Hello,


Trying again, in case this got unnoticed the first time.
I hope that by doing so I'm not breaching the rules of the mailing list.

If nobody answers, then I'll conclude that nobody knows about that, and shall not insist anymore. :)


Regards,
Nicolas.

De : sr-users <sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>> De la part de Chaigneau, Nicolas
Envoyé : vendredi 8 avril 2022 17:01
À : sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>
Objet : [SR-Users] PostgreSQL - module sqlops - working with prepared statements ?

Hello,


I'm using sql_xquery from sqlops module to execute requests on a PostgreSQL database.
This work fine.

Now, for performance reasons, I would like to use prepared statements.
I'm wondering if this is possible using sql_xquery. I've looked at the code and documentation, it seems it is not supported.
Can you confirm ?

If not possible with sql_xquery, is it possible with another existing function ?

In the code, I've searched for « PQprepare » / « PQexecPrepared ».
These can be found only in « modules/db_postgres/pg_cmd.c », in function « pg_cmd_exec » which is exported from « modules/db_postgres/pg_mod.c » (see below).
I have no idea how to use these though... :/

Any ideas ?



/*
* Postgres module interface
*/
static cmd_export_t cmds[] = {
       {"db_ctx", (cmd_function)NULL, 0, 0, 0, 0},
       {"db_con", (cmd_function)pg_con, 0, 0, 0, 0},
       {"db_uri", (cmd_function)pg_uri, 0, 0, 0, 0},
       {"db_cmd", (cmd_function)pg_cmd, 0, 0, 0, 0},
       {"db_put", (cmd_function)pg_cmd_exec, 0, 0, 0, 0},
       {"db_del", (cmd_function)pg_cmd_exec, 0, 0, 0, 0},
       {"db_get", (cmd_function)pg_cmd_exec, 0, 0, 0, 0},
       {"db_upd", (cmd_function)pg_cmd_exec, 0, 0, 0, 0},
       {"db_sql", (cmd_function)pg_cmd_exec, 0, 0, 0, 0},
       {"db_res", (cmd_function)pg_res, 0, 0, 0, 0},
       {"db_fld", (cmd_function)pg_fld, 0, 0, 0, 0},
       {"db_first", (cmd_function)pg_cmd_first, 0, 0, 0, 0},
       {"db_next", (cmd_function)pg_cmd_next, 0, 0, 0, 0},
       {"db_setopt", (cmd_function)pg_setopt, 0, 0, 0, 0},
       {"db_getopt", (cmd_function)pg_getopt, 0, 0, 0, 0},
       {"db_bind_api", (cmd_function)db_postgres_bind_api, 0, 0, 0, 0},
       {0, 0, 0, 0, 0, 0}
};



Regards,
Nicolas.


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