SaeMysql l类

<?php

/**
* SAE Mysql服务
*
* 支持主从分离
*
* @author Easychen <easychen@gmail.com>
* @version $Id$
* @package sae
*
*/

/**
* Sae Mysql Class
*
* <code>
* <?php
* $mysql = new SaeMysql();
*
* $sql = "SELECT * FROM `user` LIMIT 10";
* $data = $mysql->getData( $sql );
* $name = strip_tags( $_REQUEST['name'] );
* $age = intval( $_REQUEST['age'] );
* $sql = "INSERT  INTO `user` ( `name` , `age` , `regtime` ) VALUES ( '"  . $mysql->escape( $name ) . "' , '" . intval( $age ) . "' , NOW() ) ";
* $mysql->runSql( $sql );
* if( $mysql->errno() != 0 )
* {
*     die( "Error:" . $mysql->errmsg() );
* }
*
* $mysql->closeDb();
* ?>
* </code>
*
* @package sae
* @author EasyChen
*
*/
class SaeMysql extends SaeObject
{

/**
* 构造函数
*
* @param bool $do_replication 是否支持主从分离，true:支持，false:不支持，默认为true
* @return void
* @author EasyChen
*/
function __construct($do_replication = true)
{
$this->port = 3307;
$this->host = '.rdc.sae.sina.com.cn';

$this->accesskey = SAE_ACCESSKEY;
$this->secretkey = SAE_SECRETKEY;
$this->appname = 'app_'.$_SERVER['HTTP_APPNAME'];

//set default charset as utf8
$this->charset = 'UTF8';

$this->do_replication = $do_replication;
}

/**
* 设置keys
*
* 当需要连接其他APP的数据库时使用
*
* @param string $akey AccessKey
* @param string $skey SecretKey
* @return void
* @author EasyChen
*/
public function setAuth($akey, $skey)
{
$this->accesskey = $akey;
$this->secretkey = $skey;
}

/**
* 设置Mysql服务器端口
*
* 当需要连接其他APP的数据库时使用
*
* @param string $port
* @return void
* @author EasyChen
*/
public function setPort($port)
{
$this->port = 3307;
$this->host = '.rdc.sae.sina.com.cn';

}

/**
* 设置Appname
*
* 当需要连接其他APP的数据库时使用
*
* @param string $appname
* @return void
* @author EasyChen
*/
public function setAppname($appname)
{
$this->appname = 'app_'.$appname;
}

/**
* 设置当前连接的字符集 , 必须在发起连接之前进行设置
*
* @param string $charset 字符集,如GBK,GB2312,UTF8
* @return void
*/
public function setCharset($charset)
{
return $this->set_charset($charset);
}

/**
* 同setCharset,向前兼容
*
* @param string $charset
* @return void
* @ignore
*/
public function set_charset($charset)
{
$this->charset = $charset;
}

/**
* 运行Sql语句,不返回结果集
*
* @param string $sql
* @return mysqli_result|bool
*/
public function runSql($sql)
{
return $this->run_sql($sql);
}

/**
* 同runSql,向前兼容
*
* @param string $sql
* @return bool
* @author EasyChen
* @ignore
*/
public function run_sql($sql)
{
$this->last_sql = $sql;
$dblink = $this->db_write();
if ($dblink===false)
{
return false;
}
$ret = mysqli_query($dblink, $sql);
$this->save_error($dblink);
return $ret;
}

/**
* 运行Sql,以多维数组方式返回结果集
*
* @param string $sql
* @return array 成功返回数组，失败时返回false
* @author EasyChen
*/
public function getData($sql)
{
return $this->get_data($sql);
}

/**
* 同getData,向前兼容
*
* @ignore
*/
public function get_data($sql)
{
$this->last_sql = $sql;
$data = Array();
$i = 0;
$dblink = $this->do_replication?$this->db_read():$this->db_write();
if ($dblink===false)
{
return false;
}
$result = mysqli_query($dblink, $sql);

$this->save_error($dblink);

if (is_bool($result))
{
return $result;
}
else
{
while ($Array = mysqli_fetch_array($result, MYSQL_ASSOC))
{
$data[$i++] = $Array;
}
}

mysqli_free_result($result);

if (count($data)>0)
return $data;
else
return NULL;
}

/**
* 运行Sql,以数组方式返回结果集第一条记录
*
* @param string $sql
* @return array 成功返回数组，失败时返回false
* @author EasyChen
*/
public function getLine($sql)
{
return $this->get_line($sql);
}

/**
* 同getLine,向前兼容
*
* @param string $sql
* @return array
* @author EasyChen
* @ignore
*/
public function get_line($sql)
{
$data = $this->get_data($sql);
if ($data)
{
return @reset($data);
}
else
{
return false;
}
}

/**
* 运行Sql,返回结果集第一条记录的第一个字段值
*
* @param string $sql
* @return mixxed 成功时返回一个值，失败时返回false
* @author EasyChen
*/
public function getVar($sql)
{
return $this->get_var($sql);
}

/**
* 同getVar,向前兼容
*
* @param string $sql
* @return array
* @author EasyChen
* @ignore
*/
public function get_var($sql)
{
$data = $this->get_line($sql);
if ($data)
{
return $data[@reset(@array_keys($data))];
}
else
{
return false;
}
}

/**
* 同mysqli_affected_rows函数
*
* @return int 成功返回行数,失败时返回-1
* @author Elmer Zhang
*/
public function affectedRows()
{
$result = mysqli_affected_rows($this->db_write());
return $result;
}

/**
* 同mysqli_last_id函数
*
* @return int 成功返回last_id,失败时返回false
* @author EasyChen
*/
public function lastId()
{
return $this->last_id();
}

/**
* 同lastId,向前兼容
*
* @return int
* @author EasyChen
* @ignore
*/
public function last_id()
{
$result = mysqli_insert_id($this->db_write());
return $result;
}

/**
* 关闭数据库连接
*
* @return bool
* @author EasyChen
*/
public function closeDb()
{
return $this->close_db();
}

/**
* 同closeDb,向前兼容
*
* @return bool
* @author EasyChen
* @ignore
*/
public function close_db()
{
if (isset($this->db_read)) @mysqli_close($this->db_read);

if (isset($this->db_write)) @mysqli_close($this->db_write);

}

/**
*  同mysqli_real_escape_string
*
* @param string $str
* @return string
* @author EasyChen
*/
public function escape($str)
{
if (isset($this->db_read))
{
$db = $this->db_read;
}
elseif (isset($this->db_write))
{
$db = $this->db_write;
}
else
{
$db = $this->db_read();
}

return mysqli_real_escape_string($db, $str);
}

/**
* 返回错误码
*
*
* @return int
* @author EasyChen
*/
public function errno()
{
return $this->errno;
}

/**
* 返回错误信息
*
* @return string
* @author EasyChen
*/
public function error()
{
return $this->error;
}

/**
* 返回错误信息,error的别名
*
* @return string
* @author EasyChen
*/
public function errmsg()
{
return $this->error();
}

/**
* @ignore
*/
private function connect($is_master = true)
{
if ($this->port==0)
{
$this->error = 13048;
$this->errno = 'Not Initialized';
return false;
}
if ($is_master)
$host = 'w'.$this->host;
else
$host = 'r'.$this->host;

$db = mysqli_init();
mysqli_options($db, MYSQLI_OPT_CONNECT_TIMEOUT, 5);

if (!mysqli_real_connect($db, $host, $this->accesskey, $this->secretkey, $this->appname, $this->port))
{
$this->error = mysqli_connect_error();
$this->errno = mysqli_connect_errno();
return false;
}

mysqli_set_charset($db, $this->charset);

return $db;
}

/**
* @ignore
*/
private function db_read()
{
if (isset($this->db_read))
{
return $this->db_read;
}
else
{
if (!$this->do_replication)
return $this->db_write();
else
{
$this->db_read = $this->connect(false);
return $this->db_read;
}
}
}

/**
* @ignore
*/
private function db_write()
{
if (isset($this->db_write))
{
return $this->db_write;
}
else
{
$this->db_write = $this->connect(true);
return $this->db_write;
}
}

/**
* @ignore
*/
private function save_error($dblink)
{
$this->error = mysqli_error($dblink);
$this->errno = mysqli_errno($dblink);
}

private $error;

private $errno;

private $last_sql;

}