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mysql.php
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PHP Script
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2001-02-19
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13KB
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465 lines
<?php
//
// +----------------------------------------------------------------------+
// | PHP version 4.0 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2001 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Stig Bakken <ssb@fast.no> |
// | |
// +----------------------------------------------------------------------+
//
// Database independent query interface definition for PHP's MySQL
// extension.
//
//
// XXX legend:
//
// XXX ERRORMSG: The error message from the mysql function should
// be registered here.
//
require_once "DB/common.php";
class DB_mysql extends DB_common
{
// {{{ properties
var $connection;
var $phptype, $dbsyntax;
var $prepare_tokens = array();
var $prepare_types = array();
// }}}
// {{{ constructor
/**
* DB_mysql constructor.
*
* @access public
*/
function DB_mysql()
{
$this->DB_common();
$this->phptype = "mysql";
$this->dbsyntax = "mysql";
$this->features = array(
"prepare" => false,
"pconnect" => true,
"transactions" => false
);
$this->errorcode_map = array(
1004 => DB_ERROR_CANNOT_CREATE,
1005 => DB_ERROR_CANNOT_CREATE,
1006 => DB_ERROR_CANNOT_CREATE,
1007 => DB_ERROR_ALREADY_EXISTS,
1008 => DB_ERROR_CANNOT_DROP,
1046 => DB_ERROR_NODBSELECTED,
1050 => DB_ERROR_ALREADY_EXISTS,
1051 => DB_ERROR_NOSUCHTABLE,
1054 => DB_ERROR_NOSUCHFIELD,
1062 => DB_ERROR_ALREADY_EXISTS,
1064 => DB_ERROR_SYNTAX,
1100 => DB_ERROR_NOT_LOCKED,
1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
1146 => DB_ERROR_NOSUCHTABLE,
);
}
// }}}
// {{{ connect()
/**
* Connect to a database and log in as the specified user.
*
* @param $dsn the data source name (see DB::parseDSN for syntax)
* @param $persistent (optional) whether the connection should
* be persistent
* @access public
* @return int DB_OK on success, a DB error on failure
*/
function connect($dsn, $persistent = false)
{
if (is_array($dsn)) {
$dsninfo = &$dsn;
} else {
$dsninfo = DB::parseDSN($dsn);
}
if (!$dsninfo || !$dsninfo["phptype"]) {
return $this->raiseError(); // XXX ERRORMSG
}
$this->dsn = $dsninfo;
$dbhost = $dsninfo["hostspec"] ? $dsninfo["hostspec"] : "localhost";
$user = $dsninfo["username"];
$pw = $dsninfo["password"];
DB::assertExtension("mysql");
$connect_function = $persistent ? "mysql_pconnect" : "mysql_connect";
if ($dbhost && $user && $pw) {
$conn = @$connect_function($dbhost, $user, $pw);
} elseif ($dbhost && $user) {
$conn = @$connect_function($dbhost, $user);
} elseif ($dbhost) {
$conn = @$connect_function($dbhost);
} else {
$conn = false;
}
if ($conn == false) {
return $this->raiseError(); // XXX ERRORMSG
}
if ($dsninfo["database"]) {
if (!mysql_select_db($dsninfo["database"], $conn)) {
return $this->raiseError(); // XXX ERRORMSG
}
}
$this->connection = $conn;
return DB_OK;
}
// }}}
// {{{ disconnect()
/**
* Log out and disconnect from the database.
*
* @access public
*
* @return bool TRUE on success, FALSE if not connected.
*/
function disconnect()
{
return mysql_close($this->connection);
}
// }}}
// {{{ simpleQuery()
/**
* Send a query to MySQL and return the results as a MySQL resource
* identifier.
*
* @param the SQL query
*
* @access public
*
* @return mixed returns a valid MySQL result for successful SELECT
* queries, DB_OK for other successful queries. A DB error is
* returned on failure.
*/
function simpleQuery($query)
{
$this->last_query = $query;
$query = $this->modifyQuery($query);
$result = mysql_query($query, $this->connection);
if (!$result) {
return $this->mysqlRaiseError();
}
// Determine which queries that should return data, and which
// should return an error code only.
return DB::isManip($query) ? DB_OK : $result;
}
// }}}
// {{{ fetchRow()
/**
* Fetch a row and return as array.
*
* @param $result MySQL result identifier
* @param $fetchmode how the resulting array should be indexed
*
* @access public
*
* @return mixed an array on success, a DB error on failure, NULL
* if there is no more data
*/
function &fetchRow($result, $fetchmode = DB_FETCHMODE_DEFAULT)
{
if ($fetchmode == DB_FETCHMODE_DEFAULT) {
$fetchmode = $this->fetchmode;
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
$row = mysql_fetch_array($result, MYSQL_ASSOC);
} else {
$row = mysql_fetch_row($result);
}
if (!$row) {
$errno = mysql_errno($this->connection);
if (!$errno) {
return null;
}
return $this->mysqlRaiseError($errno);
}
return $row;
}
// }}}
// {{{ fetchInto()
/**
* Fetch a row and insert the data into an existing array.
*
* @param $result MySQL result identifier
* @param $arr (reference) array where data from the row is stored
* @param $fetchmode how the array data should be indexed
*
* @access public
*
* @return int DB_OK on success, a DB error on failure
*/
function fetchInto($result, &$arr, $fetchmode = DB_FETCHMODE_DEFAULT)
{
if ($fetchmode == DB_FETCHMODE_DEFAULT) {
$fetchmode = $this->fetchmode;
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
$arr = mysql_fetch_array($result, MYSQL_ASSOC);
} else {
$arr = mysql_fetch_row($result);
}
if (!$arr) {
$errno = mysql_errno($this->connection);
if (!$errno) {
return NULL;
}
return $this->mysqlRaiseError($errno);
}
return DB_OK;
}
// }}}
// {{{ freeResult()
/**
* Free the internal resources associated with $result.
*
* @param $result MySQL result identifier or DB statement identifier
*
* @access public
*
* @return bool TRUE on success, FALSE if $result is invalid
*/
function freeResult($result)
{
if (is_resource($result)) {
return mysql_free_result($result);
}
if (!isset($this->prepare_tokens[$result])) {
return false;
}
unset($this->prepare_tokens[$result]);
unset($this->prepare_types[$result]);
return true;
}
// }}}
// {{{ numCols()
/**
* Get the number of columns in a result set.
*
* @param $result MySQL result identifier
*
* @access public
*
* @return int the number of columns per row in $result
*/
function numCols($result)
{
$cols = mysql_num_fields($result);
if (!$cols) {
return $this->mysqlRaiseError();
}
return $cols;
}
// }}}
// {{{ numRows()
/**
* Get the number of rows in a result set.
*
* @param $result MySQL result identifier
*
* @access public
*
* @return int the number of rows in $result
*/
function numRows($result)
{
$rows = @mysql_num_rows($result);
if ($rows === null) {
return $this->mysqlRaiseError();
}
return $rows;
}
// }}}
// {{{ affectedRows()
/**
* Gets the number of rows affected by the data manipulation
* query. For other queries, this function returns 0.
*
* @return number of rows affected by the last query
*/
function affectedRows()
{
if (DB::isManip($this->last_query)) {
$result = mysql_affected_rows($this->connection);
} else {
$result = 0;
}
return $result;
}
// }}}
// {{{ errorNative()
/**
* Get the native error code of the last error (if any) that
* occured on the current connection.
*
* @access public
*
* @return int native MySQL error code
*/
function errorNative()
{
return mysql_errno($this->connection);
}
// }}}
// {{{ nextId()
/**
* Get the next value in a sequence. We emulate sequences
* for MySQL. Will create the sequence if it does not exist.
*
* @access public
*
* @param $seq_name the name of the sequence
*
* @param $ondemand whether to create the sequence table on demand
* (default is true)
*
* @return a sequence integer, or a DB error
*/
function nextId($seq_name, $ondemand = true)
{
$sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
$repeat = 0;
do {
$result = $this->query("INSERT INTO ${sqn}_seq VALUES(NULL)");
if ($ondemand && DB::isError($result) &&
$result->getCode() == DB_ERROR_NOSUCHTABLE) {
$repeat = 1;
$result = $this->createSequence($seq_name);
if (DB::isError($result)) {
return $result;
}
} else {
$repeat = 0;
}
} while ($repeat);
if (DB::isError($result)) {
return $result;
}
return mysql_insert_id($this->connection);
}
// }}}
// {{{ createSequence()
function createSequence($seq_name)
{
$sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
return $this->query("CREATE TABLE ${sqn}_seq ".
"(id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,".
" PRIMARY KEY(id))");
}
// }}}
// {{{ dropSequence()
function dropSequence($seq_name)
{
$sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
return $this->query("DROP TABLE ${sqn}_seq");
}
// }}}
// {{{ modifyQuery()
function modifyQuery($query)
{
if ($this->options['optimize'] == 'portability') {
// "DELETE FROM table" gives 0 affected rows in MySQL.
// This little hack lets you know how many rows were deleted.
if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $query)) {
$query = preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/',
'DELETE FROM \1 WHERE 1=1', $query);
}
}
return $query;
}
// }}}
// {{{ mysqlRaiseError()
function mysqlRaiseError($errno = null)
{
if ($errno === null) {
return $this->raiseError($this->errorCode(mysql_errno($this->connection)));
}
return $this->raiseError($this->errorCode($errno));
}
// }}}
// TODO/wishlist:
// simpleFetch
// simpleGet
// longReadlen
// binmode
}
?>