139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
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* =====================================================================================
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*
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* Filename: postgresql.c
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*
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* Description: Interface to a PostgreSQL database
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*
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* Version: 0.1
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* Created: 16/09/2010 00:23:34
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* Revision: none
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* Compiler: gcc
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*
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* Author: BlackLight (http://0x00.ath.cx), <blacklight@autistici.org>
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* Licence: GNU GPL v.3
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* Company: DO WHAT YOU WANT CAUSE A PIRATE IS FREE, YOU ARE A PIRATE!
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*
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* =====================================================================================
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*/
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#include "spp_ai.h"
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#ifdef HAVE_LIBPQ
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#include <alloca.h>
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#include <postgresql/libpq-fe.h>
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#include "db.h"
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/** \defgroup postgresql Module for the interface with a PostgreSQL DBMS
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* @{ */
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PRIVATE PGconn *db = NULL;
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void*
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postgresql_do_init ( AI_config *config )
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{
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char *conninfo = NULL;
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int conninfo_max_length =
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((config->dbhost) ? strlen ( config->dbhost ) : 0) +
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((config->dbuser) ? strlen ( config->dbuser ) : 0) +
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((config->dbpass) ? strlen ( config->dbpass ) : 0) +
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((config->dbname) ? strlen ( config->dbname ) : 0) + 100;
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if ( !( conninfo = (char*) alloca ( conninfo_max_length )))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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memset ( conninfo, 0, conninfo_max_length );
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snprintf ( conninfo, conninfo_max_length, "dbname=%s", config->dbname );
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if ( config->dbuser )
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sprintf ( conninfo, "%s user=%s", conninfo, config->dbuser );
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if ( config->dbpass )
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sprintf ( conninfo, "%s password=%s", conninfo, config->dbpass );
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if ( config->dbhost )
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sprintf ( conninfo, "%s hostaddr=%s", conninfo, config->dbhost );
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if ( PQstatus ( db = PQconnectdb ( conninfo )) != CONNECTION_OK )
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return NULL;
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return (void*) db;
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}
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PSQL_result*
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postgresql_do_query ( const char *query )
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{
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int i, j, ntuples, nfields;
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PSQL_result *res = NULL;
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if ( !( res = (PSQL_result*) malloc ( sizeof ( PSQL_result ))))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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if ( PQresultStatus ( res->res = PQexec( db, query )) != PGRES_TUPLES_OK )
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{
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PQfinish ( db );
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return NULL;
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}
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ntuples = PQntuples ( res->res );
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res->index = 0;
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res->rows = NULL;
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if ( !( res->rows = ( char*** ) malloc ( ntuples * sizeof ( char** ))))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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for ( i=0; i < ntuples; i++ )
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{
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nfields = PQnfields ( res->res );
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if ( !( res->rows[i] = ( char** ) malloc ( nfields * sizeof ( char* ))))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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for ( j=0; j < nfields; j++ )
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{
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res->rows[i][j] = PQgetvalue ( res->res, i, j );
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}
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}
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return res;
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}
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int
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postgresql_num_rows ( PSQL_result *res )
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{
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return PQntuples ( res->res );
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}
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char**
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postgresql_fetch_row ( PSQL_result *res )
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{
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if ( (res->index++) >= PQntuples ( res->res ))
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return NULL;
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return res->rows[ res->index - 1];
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}
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void
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postgresql_free_result ( PSQL_result *res )
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{
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if ( res )
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{
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PQclear ( res->res );
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free ( res );
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}
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}
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void
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postgresql_do_close ()
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{
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if ( db )
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PQfinish ( db );
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db = NULL;
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}
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/* @} */
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#endif
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