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km_dbase.c
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/*
* MySQL module core functions
*
* Copyright (C) 2001-2003 FhG Fokus
* Copyright (C) 2007-2008 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 Implementation of core functions for the MySQL driver.
*
* This file contains the implementation of core functions for the MySQL
* database driver, for example to submit a query or fetch a result.
* \ingroup db_mysql
* Module: \ref db_mysql
*/
#include <stdio.h>
#include <string.h>
#include <mysql.h>
#include <errmsg.h>
#include "../../core/mem/mem.h"
#include "../../core/dprint.h"
#include "../../core/async_task.h"
#include "../../lib/srdb1/db_query.h"
#include "../../lib/srdb1/db_ut.h"
#include "db_mysql.h"
#include "km_val.h"
#include "km_my_con.h"
#include "km_res.h"
#include "km_row.h"
#include "km_db_mysql.h"
#include "km_dbase.h"
static char *mysql_sql_buf;
/**
* \brief Send a SQL query to the server.
*
* Send a SQL query to the database server. This methods tries to reconnect
* to the server if the connection is gone and the auto_reconnect parameter is
* enabled. It also issues a mysql_ping before the query to connect again after
* a long waiting period because for some older mysql versions the auto reconnect
* don't work sufficient. If auto_reconnect is enabled and the server supports it,
* then the mysql_ping is probably not necessary, but its safer to do it in this
* cases too.
*
* \param _h handle for the db
* \param _s executed query
* \return zero on success, negative value on failure
*/
static int db_mysql_submit_query(const db1_con_t* _h, const str* _s)
{
time_t t;
int i, code;
if (!_h || !_s || !_s->s) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (my_ping_interval) {
t = time(0);
if ((t - CON_TIMESTAMP(_h)) > my_ping_interval) {
for (i=0; i < (db_mysql_auto_reconnect ? 3 : 1); i++) {
if (mysql_ping(CON_CONNECTION(_h))) {
LM_INFO("driver error on ping: %s\n", mysql_error(CON_CONNECTION(_h)));
counter_inc(mysql_cnts_h.driver_err);
} else {
break;
}
}
}
/*
* We're doing later a query anyway that will reset the timout of the server,
* so it makes sense to set the timestamp value to the actual time in order
* to prevent unnecessary pings.
*/
CON_TIMESTAMP(_h) = t;
}
/* screws up the terminal when the query contains a BLOB :-( (by bogdan)
* LM_DBG("submit_query(): %.*s\n", _s->len, _s->s);
*/
/* When a server connection is lost and a query is attempted, most of
* the time the query will return a CR_SERVER_LOST, then at the second
* attempt to execute it, the mysql lib will reconnect and succeed.
* However is a few cases, the first attempt returns CR_SERVER_GONE_ERROR
* the second CR_SERVER_LOST and only the third succeeds.
* Thus the 3 in the loop count. Increasing the loop count over this
* value shouldn't be needed, but it doesn't hurt either, since the loop
* will most of the time stop at the second or sometimes at the third
* iteration. In the case of CR_SERVER_GONE_ERROR and CR_SERVER_LOST the
* driver error counter is increased
*/
for (i=0; i < (db_mysql_auto_reconnect ? 3 : 1); i++) {
if (mysql_real_query(CON_CONNECTION(_h), _s->s, _s->len) == 0) {
return 0;
}
code = mysql_errno(CON_CONNECTION(_h));
if (code!=CR_SERVER_GONE_ERROR && code!=CR_SERVER_LOST
&& code!=CR_SSL_CONNECTION_ERROR && code!=CR_CONNECTION_ERROR
&& code!=CR_CONN_HOST_ERROR && code!=CR_SERVER_LOST_EXTENDED) {
break;
}
counter_inc(mysql_cnts_h.driver_err);
}
LM_ERR("driver error on query: %s (%d)\n", mysql_error(CON_CONNECTION(_h)),
mysql_errno(CON_CONNECTION(_h)));
return -2;
}
/**
*
*/
void db_mysql_async_exec_task(void *param)
{
str *p;
db1_con_t* dbc;
p = (str*)param;
dbc = db_mysql_init(&p[0]);
if(dbc==NULL) {
LM_ERR("failed to open connection for [%.*s]\n", p[0].len, p[0].s);
return;
}
if(db_mysql_submit_query(dbc, &p[1])<0) {
LM_ERR("failed to execute query [%.*s] on async worker\n",
(p[1].len>100)?100:p[1].len, p[1].s);
}
db_mysql_close(dbc);
}
/**
* Execute a raw SQL query via core async framework.
* \param _h handle for the database
* \param _s raw query string
* \return zero on success, negative value on failure
*/
int db_mysql_submit_query_async(const db1_con_t* _h, const str* _s)
{
struct db_id* di;
async_task_t *atask;
int asize;
str *p;
di = ((struct pool_con*)_h->tail)->id;
asize = sizeof(async_task_t) + 2*sizeof(str) + di->url.len + _s->len + 2;
atask = shm_malloc(asize);
if(atask==NULL) {
LM_ERR("no more shared memory to allocate %d\n", asize);
return -1;
}
atask->exec = db_mysql_async_exec_task;
atask->param = (char*)atask + sizeof(async_task_t);
p = (str*)((char*)atask + sizeof(async_task_t));
p[0].s = (char*)p + 2*sizeof(str);
p[0].len = di->url.len;
strncpy(p[0].s, di->url.s, di->url.len);
p[1].s = p[0].s + p[0].len + 1;
p[1].len = _s->len;
strncpy(p[1].s, _s->s, _s->len);
if (async_task_push(atask)<0) {
shm_free(atask);
return -1;
}
return 0;
}
static char *db_mysql_tquote = "`";
/**
* Initialize the database module.
* No function should be called before this
* \param _url URL used for initialization
* \return zero on success, negative value on failure
*/
db1_con_t* db_mysql_init(const str* _url)
{
db1_con_t *c;
c = db_do_init(_url, (void *)db_mysql_new_connection);
if(c) CON_TQUOTE(c) = db_mysql_tquote;
return c;
}
/**
* Shut down the database module.
* No function should be called after this
* \param _h handle to the closed connection
* \return zero on success, negative value on failure
*/
void db_mysql_close(db1_con_t* _h)
{
db_do_close(_h, db_mysql_free_connection);
}
/**
* Retrieve a result set
* \param _h handle to the database
* \param _r result set that should be retrieved
* \return zero on success, negative value on failure
*/
static int db_mysql_store_result(const db1_con_t* _h, db1_res_t** _r)
{
int code;
if ((!_h) || (!_r)) {
LM_ERR("invalid parameter value\n");
return -1;
}
*_r = db_mysql_new_result();
if (*_r == 0) {
LM_ERR("no memory left\n");
return -2;
}
RES_RESULT(*_r) = mysql_store_result(CON_CONNECTION(_h));
if (!RES_RESULT(*_r)) {
if (mysql_field_count(CON_CONNECTION(_h)) == 0) {
(*_r)->col.n = 0;
(*_r)->n = 0;
goto done;
} else {
LM_ERR("driver error: %s\n", mysql_error(CON_CONNECTION(_h)));
code = mysql_errno(CON_CONNECTION(_h));
if (code == CR_SERVER_GONE_ERROR || code == CR_SERVER_LOST) {
counter_inc(mysql_cnts_h.driver_err);
}
db_mysql_free_result(_h, *_r);
*_r = 0;
return -3;
}
}
if (db_mysql_convert_result(_h, *_r) < 0) {
LM_ERR("error while converting result\n");
LM_DBG("freeing result set at %p\n", _r);
/* all mem on Kamailio API side is already freed by
* db_mysql_convert_result in case of error, but we also need
* to free the mem from the mysql lib side, internal pkg for it
* and *_r */
db_mysql_free_result(_h, *_r);
*_r = 0;
#if (MYSQL_VERSION_ID >= 40100)
while( mysql_more_results(CON_CONNECTION(_h)) && mysql_next_result(CON_CONNECTION(_h)) == 0 ) {
MYSQL_RES *res = mysql_store_result( CON_CONNECTION(_h) );
mysql_free_result(res);
}
#endif
return -4;
}
done:
#if (MYSQL_VERSION_ID >= 40100)
while( mysql_more_results(CON_CONNECTION(_h)) && mysql_next_result(CON_CONNECTION(_h)) == 0 ) {
MYSQL_RES *res = mysql_store_result( CON_CONNECTION(_h) );
mysql_free_result(res);
}
#endif
return 0;
}
/**
* Release a result set from memory.
* \param _h handle to the database
* \param _r result set that should be freed
* \return zero on success, negative value on failure
*/
int db_mysql_free_result(const db1_con_t* _h, db1_res_t* _r)
{
if ((!_h) || (!_r)) {
LM_ERR("invalid parameter value\n");
return -1;
}
mysql_free_result(RES_RESULT(_r));
RES_RESULT(_r) = 0;
pkg_free(RES_PTR(_r));
if (db_free_result(_r) < 0) {
LM_ERR("unable to free result structure\n");
return -1;
}
return 0;
}
/**
* Query a table for specified rows.
* \param _h structure representing database connection
* \param _k key names
* \param _op operators
*\param _v values of the keys that must match
* \param _c column names to return
* \param _n number of key=values pairs to compare
* \param _nc number of columns to return
* \param _o order by the specified column
* \param _r pointer to a structure representing the result
* \return zero on success, negative value on failure
*/
int db_mysql_query(const db1_con_t* _h, const db_key_t* _k, const db_op_t* _op,
const db_val_t* _v, const db_key_t* _c, const int _n, const int _nc,
const db_key_t _o, db1_res_t** _r)
{
return db_do_query(_h, _k, _op, _v, _c, _n, _nc, _o, _r,
db_mysql_val2str, db_mysql_submit_query, db_mysql_store_result);
}
/**
* \brief Gets a partial result set, fetch rows from a result
*
* Gets a partial result set, fetch a number of rows from a database result.
* This function initialize the given result structure on the first run, and
* fetches the nrows number of rows. On subsequenting runs, it uses the
* existing result and fetches more rows, until it reaches the end of the
* result set. Because of this the result needs to be null in the first
* invocation of the function. If the number of wanted rows is zero, the
* function returns anything with a result of zero.
* \param _h structure representing the database connection
* \param _r pointer to a structure representing the result
* \param nrows number of fetched rows
* \return zero on success, negative value on failure
*/
int db_mysql_fetch_result(const db1_con_t* _h, db1_res_t** _r, const int nrows)
{
int rows, i, code;
if (!_h || !_r || nrows < 0) {
LM_ERR("Invalid parameter value\n");
return -1;
}
/* exit if the fetch count is zero */
if (nrows == 0) {
db_mysql_free_result(_h, *_r);
*_r = 0;
return 0;
}
if(*_r==0) {
/* Allocate a new result structure */
*_r = db_mysql_new_result();
if (*_r == 0) {
LM_ERR("no memory left\n");
return -2;
}
RES_RESULT(*_r) = mysql_store_result(CON_CONNECTION(_h));
if (!RES_RESULT(*_r)) {
if (mysql_field_count(CON_CONNECTION(_h)) == 0) {
(*_r)->col.n = 0;
(*_r)->n = 0;
return 0;
} else {
LM_ERR("driver error: %s\n", mysql_error(CON_CONNECTION(_h)));
code = mysql_errno(CON_CONNECTION(_h));
if (code == CR_SERVER_GONE_ERROR || code == CR_SERVER_LOST) {
counter_inc(mysql_cnts_h.driver_err);
}
db_mysql_free_result(_h, *_r);
*_r = 0;
return -3;
}
}
if (db_mysql_get_columns(_h, *_r) < 0) {
LM_ERR("error while getting column names\n");
return -4;
}
RES_NUM_ROWS(*_r) = mysql_num_rows(RES_RESULT(*_r));
if (!RES_NUM_ROWS(*_r)) {
LM_DBG("no rows returned from the query\n");
RES_ROWS(*_r) = 0;
return 0;
}
} else {
/* free old rows */
if(RES_ROWS(*_r)!=0)
db_free_rows(*_r);
RES_ROWS(*_r) = 0;
RES_ROW_N(*_r) = 0;
}
/* determine the number of rows remaining to be processed */
rows = RES_NUM_ROWS(*_r) - RES_LAST_ROW(*_r);
/* If there aren't any more rows left to process, exit */
if(rows<=0)
return 0;
/* if the fetch count is less than the remaining rows to process */
/* set the number of rows to process (during this call) equal to the fetch count */
if(nrows < rows)
rows = nrows;
RES_ROW_N(*_r) = rows;
LM_DBG("converting row %d of %d count %d\n", RES_LAST_ROW(*_r),
RES_NUM_ROWS(*_r), RES_ROW_N(*_r));
RES_ROWS(*_r) = (struct db_row*)pkg_malloc(sizeof(db_row_t) * rows);
if (!RES_ROWS(*_r)) {
LM_ERR("no memory left\n");
return -5;
}
for(i = 0; i < rows; i++) {
RES_ROW(*_r) = mysql_fetch_row(RES_RESULT(*_r));
if (!RES_ROW(*_r)) {
LM_ERR("driver error: %s\n", mysql_error(CON_CONNECTION(_h)));
RES_ROW_N(*_r) = i;
db_free_rows(*_r);
return -6;
}
if (db_mysql_convert_row(_h, *_r, &(RES_ROWS(*_r)[i])) < 0) {
LM_ERR("error while converting row #%d\n", i);
RES_ROW_N(*_r) = i;
db_free_rows(*_r);
return -7;
}
}
/* update the total number of rows processed */
RES_LAST_ROW(*_r) += rows;
return 0;
}
/**
* Execute a raw SQL query.
* \param _h handle for the database
* \param _s raw query string
* \param _r result set for storage
* \return zero on success, negative value on failure
*/
int db_mysql_raw_query(const db1_con_t* _h, const str* _s, db1_res_t** _r)
{
return db_do_raw_query(_h, _s, _r, db_mysql_submit_query,
db_mysql_store_result);
}
/**
* Execute a raw SQL query via core async framework.
* \param _h handle for the database
* \param _s raw query string
* \return zero on success, negative value on failure
*/
int db_mysql_raw_query_async(const db1_con_t* _h, const str* _s)
{
return db_mysql_submit_query_async(_h, _s);
}
/**
* Insert a row into a specified table.
* \param _h structure representing database connection
* \param _k key names
* \param _v values of the keys
* \param _n number of key=value pairs
* \return zero on success, negative value on failure
*/
int db_mysql_insert(const db1_con_t* _h, const db_key_t* _k, const db_val_t* _v,
const int _n)
{
if(unlikely(db_mysql_insert_all_delayed==1))
return db_do_insert_delayed(_h, _k, _v, _n, db_mysql_val2str,
db_mysql_submit_query);
else
return db_do_insert(_h, _k, _v, _n, db_mysql_val2str,
db_mysql_submit_query);
}
/**
* Delete a row from the specified table
* \param _h structure representing database connection
* \param _k key names
* \param _o operators
* \param _v values of the keys that must match
* \param _n number of key=value pairs
* \return zero on success, negative value on failure
*/
int db_mysql_delete(const db1_con_t* _h, const db_key_t* _k, const db_op_t* _o,
const db_val_t* _v, const int _n)
{
return db_do_delete(_h, _k, _o, _v, _n, db_mysql_val2str,
db_mysql_submit_query);
}
/**
* Update some rows in the specified table
* \param _h structure representing database connection
* \param _k key names
* \param _o operators
* \param _v values of the keys that must match
* \param _uk updated columns
* \param _uv updated values of the columns
* \param _n number of key=value pairs
* \param _un number of columns to update
* \return zero on success, negative value on failure
*/
int db_mysql_update(const db1_con_t* _h, const db_key_t* _k, const db_op_t* _o,
const db_val_t* _v, const db_key_t* _uk, const db_val_t* _uv, const int _n,
const int _un)
{
return db_do_update(_h, _k, _o, _v, _uk, _uv, _n, _un, db_mysql_val2str,
db_mysql_submit_query);
}
/**
* Just like insert, but replace the row if it exists.
* \param _h database handle
* \param _k key names
* \param _v values of the keys that must match
* \param _n number of key=value pairs
* \param _un unused for db_mysql
* \param _m unused for db_mysql
* \return zero on success, negative value on failure
*/
int db_mysql_replace(const db1_con_t* _h, const db_key_t* _k,
const db_val_t* _v, const int _n, const int _un, const int _m)
{
return db_do_replace(_h, _k, _v, _n, db_mysql_val2str,
db_mysql_submit_query);
}
/**
* Returns the last inserted ID.
* \param _h database handle
* \return returns the ID as integer or returns 0 if the previous statement
* does not use an AUTO_INCREMENT value.
*/
int db_mysql_last_inserted_id(const db1_con_t* _h)
{
if (!_h) {
LM_ERR("invalid parameter value\n");
return -1;
}
return mysql_insert_id(CON_CONNECTION(_h));
}
/**
* Returns the affected rows of the last query.
* \param _h database handle
* \return returns the affected rows as integer or -1 on error.
*/
int db_mysql_affected_rows(const db1_con_t* _h)
{
if (!_h) {
LM_ERR("invalid parameter value\n");
return -1;
}
return (int)mysql_affected_rows(CON_CONNECTION(_h));
}
/**
* Starts a single transaction that will consist of one or more queries (SQL BEGIN)
* \param _h database handle
* \param _l database locking , supports no locking or full locking
* \return 0 on success, negative on failure
*/
int db_mysql_start_transaction(db1_con_t* _h, db_locking_t _l)
{
str begin_str = str_init("SET autocommit=0");
str lock_start_str = str_init("LOCK TABLES ");
str lock_end_str = str_init(" WRITE");
str lock_str = {0, 0};
if (!_h) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (CON_TRANSACTION(_h) == 1) {
LM_ERR("transaction already started\n");
return -1;
}
if (db_mysql_raw_query(_h, &begin_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
return -1;
}
CON_TRANSACTION(_h) = 1;
switch(_l)
{
case DB_LOCKING_NONE:
break;
case DB_LOCKING_FULL:
/* Fall-thru */
case DB_LOCKING_WRITE:
if ((lock_str.s = pkg_malloc((lock_start_str.len + CON_TABLE(_h)->len + lock_end_str.len) * sizeof(char))) == NULL)
{
LM_ERR("allocating pkg memory\n");
goto error;
}
memcpy(lock_str.s, lock_start_str.s, lock_start_str.len);
lock_str.len += lock_start_str.len;
memcpy(lock_str.s + lock_str.len, CON_TABLE(_h)->s, CON_TABLE(_h)->len);
lock_str.len += CON_TABLE(_h)->len;
memcpy(lock_str.s + lock_str.len, lock_end_str.s, lock_end_str.len);
lock_str.len += lock_end_str.len;
if (db_mysql_raw_query(_h, &lock_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
goto error;
}
if (lock_str.s) pkg_free(lock_str.s);
CON_LOCKEDTABLES(_h) = 1;
break;
default:
LM_WARN("unrecognised lock type\n");
goto error;
}
return 0;
error:
if (lock_str.s) pkg_free(lock_str.s);
db_mysql_abort_transaction(_h);
return -1;
}
/**
* Unlock tables in the session
* \param _h database handle
* \return 0 on success, negative on failure
*/
int db_mysql_unlock_tables(db1_con_t* _h)
{
str query_str = str_init("UNLOCK TABLES");
if (!_h) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (CON_LOCKEDTABLES(_h) == 0) {
LM_DBG("no active locked tables\n");
return 0;
}
if (db_mysql_raw_query(_h, &query_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
return -1;
}
CON_LOCKEDTABLES(_h) = 0;
return 0;
}
/**
* Ends a transaction and commits the changes (SQL COMMIT)
* \param _h database handle
* \return 0 on success, negative on failure
*/
int db_mysql_end_transaction(db1_con_t* _h)
{
str commit_query_str = str_init("COMMIT");
str set_query_str = str_init("SET autocommit=1");
if (!_h) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (CON_TRANSACTION(_h) == 0) {
LM_ERR("transaction not in progress\n");
return -1;
}
if (db_mysql_raw_query(_h, &commit_query_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
return -1;
}
if (db_mysql_raw_query(_h, &set_query_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
return -1;
}
/* Only _end_ the transaction after the raw_query. That way, if the
* raw_query fails, and the calling module does an abort_transaction()
* to clean-up, a ROLLBACK will be sent to the DB. */
CON_TRANSACTION(_h) = 0;
if(db_mysql_unlock_tables(_h)<0)
return -1;
return 0;
}
/**
* Ends a transaction and rollsback the changes (SQL ROLLBACK)
* \param _h database handle
* \return 1 if there was something to rollback, 0 if not, negative on failure
*/
int db_mysql_abort_transaction(db1_con_t* _h)
{
str rollback_query_str = str_init("ROLLBACK");
str set_query_str = str_init("SET autocommit=1");
int ret;
if (!_h) {
LM_ERR("invalid parameter value\n");
return -1;
}
if (CON_TRANSACTION(_h) == 0) {
LM_DBG("nothing to rollback\n");
ret = 0;
goto done;
}
/* Whether the rollback succeeds or not we need to _end_ the
* transaction now or all future starts will fail */
CON_TRANSACTION(_h) = 0;
if (db_mysql_raw_query(_h, &rollback_query_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
ret = -1;
goto done;
}
if (db_mysql_raw_query(_h, &set_query_str, NULL) < 0)
{
LM_ERR("executing raw_query\n");
ret = -1;
goto done;
}
ret = 1;
done:
db_mysql_unlock_tables(_h);
return ret;
}
/**
* Insert a row into a specified table, update on duplicate key.
* \param _h structure representing database connection
* \param _k key names
* \param _v values of the keys
* \param _n number of key=value pairs
*/
int db_mysql_insert_update(const db1_con_t* _h, const db_key_t* _k, const db_val_t* _v,
const int _n)
{
int off, ret;
static str sql_str;
if ((!_h) || (!_k) || (!_v) || (!_n)) {
LM_ERR("invalid parameter value\n");
return -1;
}
ret = snprintf(mysql_sql_buf, sql_buffer_size, "insert into %s%.*s%s (",
CON_TQUOTESZ(_h), CON_TABLE(_h)->len, CON_TABLE(_h)->s, CON_TQUOTESZ(_h));
if (ret < 0 || ret >= sql_buffer_size) goto error;
off = ret;
ret = db_print_columns(mysql_sql_buf + off, sql_buffer_size - off, _k, _n, CON_TQUOTESZ(_h));
if (ret < 0) return -1;
off += ret;
ret = snprintf(mysql_sql_buf + off, sql_buffer_size - off, ") values (");
if (ret < 0 || ret >= (sql_buffer_size - off)) goto error;
off += ret;
ret = db_print_values(_h, mysql_sql_buf + off, sql_buffer_size - off, _v, _n, db_mysql_val2str);
if (ret < 0) return -1;
off += ret;
*(mysql_sql_buf + off++) = ')';
ret = snprintf(mysql_sql_buf + off, sql_buffer_size - off, " on duplicate key update ");
if (ret < 0 || ret >= (sql_buffer_size - off)) goto error;
off += ret;
ret = db_print_set(_h, mysql_sql_buf + off, sql_buffer_size - off, _k, _v, _n, db_mysql_val2str);
if (ret < 0) return -1;
off += ret;
sql_str.s = mysql_sql_buf;
sql_str.len = off;
if (db_mysql_submit_query(_h, &sql_str) < 0) {
LM_ERR("error while submitting query\n");
return -2;
}
return 0;
error:
LM_ERR("error while preparing insert_update operation\n");
return -1;
}
/**
* Insert delayed a row into a specified table.
* \param _h structure representing database connection
* \param _k key names
* \param _v values of the keys
* \param _n number of key=value pairs
* \return zero on success, negative value on failure
*/
int db_mysql_insert_delayed(const db1_con_t* _h, const db_key_t* _k,
const db_val_t* _v, const int _n)
{
return db_do_insert_delayed(_h, _k, _v, _n, db_mysql_val2str,
db_mysql_submit_query);
}
/**
* Insert a row into a specified table via core async framework.
* \param _h structure representing database connection
* \param _k key names
* \param _v values of the keys
* \param _n number of key=value pairs
* \return zero on success, negative value on failure
*/
int db_mysql_insert_async(const db1_con_t* _h, const db_key_t* _k,
const db_val_t* _v, const int _n)
{
return db_do_insert(_h, _k, _v, _n, db_mysql_val2str,
db_mysql_submit_query_async);
}
/**
* Store the name of table that will be used by subsequent database functions
* \param _h database handle
* \param _t table name
* \return zero on success, negative value on failure
*/
int db_mysql_use_table(db1_con_t* _h, const str* _t)
{
return db_use_table(_h, _t);
}
/**
* Allocate a buffer for database module
* No function should be called before this
* \return zero on success, negative value on failure
*/
int db_mysql_alloc_buffer(void)
{
if (db_api_init())
{
LM_ERR("Failed to initialise db api\n");
return -1;
}
mysql_sql_buf = (char*)malloc(sql_buffer_size);
if (mysql_sql_buf == NULL)
return -1;
else
return 0;
}