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km_res.c
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km_res.c
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/*
* Copyright (C) 2003 August.Net Services, LLC
* Copyright (C) 2006 Norman Brandinger
* Copyright (C) 2008 1&1 Internet AG
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* Kamailio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/*! \file
* \brief DB_POSTGRES :: Core
* \ingroup db_postgres
* Module: \ref db_postgres
*/
#include <stdlib.h>
#include <string.h>
#include "../../lib/srdb1/db_id.h"
#include "../../lib/srdb1/db_res.h"
#include "../../lib/srdb1/db_con.h"
#include "../../core/dprint.h"
#include "../../core/mem/mem.h"
#include "km_res.h"
#include "km_val.h"
#include "km_pg_con.h"
#include "km_pg_type.h"
/*!
* \brief Fill the result structure with data from the query
* \param _h database connection
* \param _r result set
* \return 0 on success, negative on error
*/
int db_postgres_convert_result(const db1_con_t* _h, db1_res_t* _r)
{
if (!_h || !_r) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (db_postgres_get_columns(_h, _r) < 0) {
LM_ERR("failed to get column names\n");
return -2;
}
if (db_postgres_convert_rows(_h, _r) < 0) {
LM_ERR("failed to convert rows\n");
db_free_columns(_r);
return -3;
}
return 0;
}
/*!
* \brief Get and convert columns from a result set
* \param _h database connection
* \param _r result set
* \return 0 on success, negative on error
*/
int db_postgres_get_columns(const db1_con_t* _h, db1_res_t* _r)
{
int col, datatype;
if (!_h || !_r) {
LM_ERR("invalid parameter value\n");
return -1;
}
/* Get the number of rows (tuples) in the query result. */
RES_ROW_N(_r) = PQntuples(CON_RESULT(_h));
/* Get the number of columns (fields) in each row of the query result. */
RES_COL_N(_r) = PQnfields(CON_RESULT(_h));
if (!RES_COL_N(_r)) {
LM_DBG("no columns returned from the query\n");
return -2;
} else {
LM_DBG("%d columns returned from the query\n", RES_COL_N(_r));
}
if (db_allocate_columns(_r, RES_COL_N(_r)) != 0) {
LM_ERR("could not allocate columns\n");
return -3;
}
/* For each column both the name and the OID number of the data type are saved. */
for(col = 0; col < RES_COL_N(_r); col++) {
RES_NAMES(_r)[col] = (str*)pkg_malloc(sizeof(str));
if (! RES_NAMES(_r)[col]) {
LM_ERR("no private memory left\n");
db_free_columns(_r);
return -4;
}
LM_DBG("allocate %d bytes for RES_NAMES[%d] at %p\n", (unsigned int) sizeof(str), col,
RES_NAMES(_r)[col]);
/* The pointer that is here returned is part of the result structure. */
RES_NAMES(_r)[col]->s = PQfname(CON_RESULT(_h), col);
RES_NAMES(_r)[col]->len = strlen(PQfname(CON_RESULT(_h), col));
LM_DBG("RES_NAMES(%p)[%d]=[%.*s]\n", RES_NAMES(_r)[col], col,
RES_NAMES(_r)[col]->len, RES_NAMES(_r)[col]->s);
/* get the datatype of the column */
switch(datatype = PQftype(CON_RESULT(_h),col))
{
case INT2OID:
case INT4OID:
LM_DBG("use DB1_INT result type\n");
RES_TYPES(_r)[col] = DB1_INT;
break;
case INT8OID:
LM_DBG("use DB1_BIGINT result type\n");
RES_TYPES(_r)[col] = DB1_BIGINT;
break;
case FLOAT4OID:
case FLOAT8OID:
case NUMERICOID:
LM_DBG("use DB1_DOUBLE result type\n");
RES_TYPES(_r)[col] = DB1_DOUBLE;
break;
case DATEOID:
case TIMESTAMPOID:
case TIMESTAMPTZOID:
LM_DBG("use DB1_DATETIME result type\n");
RES_TYPES(_r)[col] = DB1_DATETIME;
break;
case BOOLOID:
case CHAROID:
case VARCHAROID:
case BPCHAROID:
LM_DBG("use DB1_STRING result type\n");
RES_TYPES(_r)[col] = DB1_STRING;
break;
case TEXTOID:
case BYTEAOID:
LM_DBG("use DB1_BLOB result type\n");
RES_TYPES(_r)[col] = DB1_BLOB;
break;
case BITOID:
case VARBITOID:
LM_DBG("use DB1_BITMAP result type\n");
RES_TYPES(_r)[col] = DB1_BITMAP;
break;
default:
LM_WARN("unhandled data type column (%.*s) type id (%d), "
"use DB1_STRING as default\n", RES_NAMES(_r)[col]->len,
RES_NAMES(_r)[col]->s, datatype);
RES_TYPES(_r)[col] = DB1_STRING;
break;
}
}
return 0;
}
/*!
* \brief Convert rows from PostgreSQL to db API representation
* \param _h database connection
* \param _r result set
* \return 0 on success, negative on error
*/
int db_postgres_convert_rows(const db1_con_t* _h, db1_res_t* _r)
{
char **row_buf, *s;
int row, col, len;
if (!_h || !_r) {
LM_ERR("invalid parameter\n");
return -1;
}
if (!RES_ROW_N(_r)) {
LM_DBG("no rows returned from the query\n");
RES_ROWS(_r) = 0;
return 0;
}
/*Allocate an array of pointers per column to holds the string representation */
len = sizeof(char *) * RES_COL_N(_r);
row_buf = (char**)pkg_malloc(len);
if (!row_buf) {
LM_ERR("no private memory left\n");
return -1;
}
LM_DBG("allocate for %d columns %d bytes in row buffer at %p\n", RES_COL_N(_r), len, row_buf);
if (db_allocate_rows(_r) < 0) {
LM_ERR("could not allocate rows\n");
LM_DBG("freeing row buffer at %p\n", row_buf);
pkg_free(row_buf);
return -2;
}
for(row = RES_LAST_ROW(_r); row < (RES_LAST_ROW(_r) + RES_ROW_N(_r)); row++) {
/* reset row buf content */
memset(row_buf, 0, len);
for(col = 0; col < RES_COL_N(_r); col++) {
/*
* The row data pointer returned by PQgetvalue points to storage
* that is part of the PGresult structure. One should not modify
* the data it points to, and one must explicitly copy the data
* into other storage if it is to be used past the lifetime of
* the PGresult structure itself.
*/
s = PQgetvalue(CON_RESULT(_h), row, col);
LM_DBG("PQgetvalue(%p,%d,%d)=[%s]\n", _h, row, col, s);
/*
* A empty string can be a NULL value, or just an empty string.
* This differs from the mysql behaviour, that further processing
* steps expect. So we need to simulate this here unfortunally.
*/
if (PQgetisnull(CON_RESULT(_h), row, col) == 0) {
row_buf[col] = s;
LM_DBG("[%d][%d] Column[%.*s]=[%s]\n",
row, col, RES_NAMES(_r)[col]->len, RES_NAMES(_r)[col]->s, row_buf[col]);
}
}
/* ASSERT: row_buf contains an entire row in strings */
if(db_postgres_convert_row(_h, _r, &(RES_ROWS(_r)[row - RES_LAST_ROW(_r)]), row_buf)<0){
LM_ERR("failed to convert row #%d\n", row);
RES_ROW_N(_r) = row - RES_LAST_ROW(_r);
LM_DBG("freeing row buffer at %p\n", row_buf);
pkg_free(row_buf);
db_free_rows(_r);
return -4;
}
}
LM_DBG("freeing row buffer at %p\n", row_buf);
pkg_free(row_buf);
row_buf = NULL;
return 0;
}
/*!
* \brief Convert a row from the result query into db API representation
* \param _h database connection
* \param _r result set
* \param _row row
* \param row_buf row buffer
* \return 0 on success, negative on error
*/
int db_postgres_convert_row(const db1_con_t* _h, db1_res_t* _r, db_row_t* _row,
char **row_buf)
{
int col, col_len;
if (!_h || !_r || !_row) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (db_allocate_row(_r, _row) != 0) {
LM_ERR("could not allocate row\n");
return -2;
}
/* For each column in the row */
for(col = 0; col < ROW_N(_row); col++) {
/* because it can contain NULL */
if (!row_buf[col]) {
col_len = 0;
} else {
col_len = strlen(row_buf[col]);
}
/* Convert the string representation into the value representation */
if (db_postgres_str2val(RES_TYPES(_r)[col], &(ROW_VALUES(_row)[col]),
row_buf[col], col_len) < 0) {
LM_ERR("failed to convert value\n");
LM_DBG("free row at %p\n", _row);
db_free_row(_row);
return -3;
}
}
return 0;
}