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

Chaigneau, Nicolas nicolas.chaigneau at capgemini.com
Fri Apr 8 17:01:08 CEST 2022


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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