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<?php
/**
* PDO链式调用的封装
* 使用预处理方式真正防止SQL注入
* 简化常用查询
* 要使用PDO高级功能， 可以通过GetConnecttion()返回PDO对象自己实现
* @author Paddy
* @link http://www.oschina.net/code/snippet_2520641_52271
* @version 1.1
*/
/*
USAGE:
//实例化对象并传人数据库配置信息
$db = new PDOHelper (array (
'host' => '127.0.0.1',
'username' => 'root',
'password' => '',
'database' => 'test',
'charset' => 'utf8',
'prefix' => '',
'persistent' => false,
'debug'=>true
));
//多行插入
$db->Insert( 't', array (
array (
'cid' => $cid,
'content' => "c1"
),
array (
'cid' => $cid,
'content' => "c2"
)
) )
->Execute();
//单行插入并获取id
$id = $db->Insert( 't', array (
'cid' => $cid,
'content' => $content
) )
->LastId();
//查询1：最简查询
$result = $db->Select( 't' )->FetchAll();
//查询2：带条件查询
$result = $db->Select( 't', array ( 'id', 'cid', 'content') )
->Where( 'cid=? and id>?', array ($cid, $id) )
->Order( 'id desc' )
->Limit( 1 )
->FetchRow();
//查询3：in用法
$where_data[] = $cid;
$ids = array(1,2,3);
$where_data += $ids;
$result = $db->Select( 't' )
->Where( 'cid=? and id in(?)', $where_data )
->FetchAll();
//更新
$count = $db->Update( 't', array (
'id' => $id,
'cid' => $cid,
'content' => $content
) )
->Where( 'id=?', $id )
->AffectedRows();
//删除
$count = $db->Delete( 't' )->Where( 'id=?', $id )->AffectedRows();
//sql语句查询
$result = $db->Sql( 'select * from `_t` where id>?', $id )->FetchAll();
//通过自定义来使用事务
$pdo = $db->GetConnecttion();
$pdo->beginTransaction();
...
*/
class PDOHelper
{
protected $mConnecttion;
protected $mPrefix;
protected $mDebug;
protected $mQueryType;
protected $mSql;
protected $mWhere;
protected $mOrder;
protected $mLimit;
protected $mData;
protected $mPDOStatement;
/**
* 构造方法
*
* @param array $config
*/
function __construct($config)
{
$this->mDebug = empty( $config['debug'] ) ? false : true;
$this->mPrefix = isset( $config['prefix'] ) ? $config['prefix'] : '';
$dsn = 'mysql:host=' . $config['host'] . ';dbname=' . $config['database'];
try
{
$this->mConnecttion = new PDO( $dsn, $config['username'], $config['password'], array (
PDO::ATTR_PERSISTENT => empty( $config['persistent'] ) ? false : true
) );
}
catch ( PDOException $e )
{
$this->Err( 'Connect failed<br/>' );
}
if ($this->mConnecttion)
{
// $this->mConnecttion->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$this->mConnecttion->setAttribute( PDO::ATTR_EMULATE_PREPARES, false );
$this->mConnecttion->setAttribute( PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC );
$charset = isset( $config['charset'] ) ? $config['charset'] : 'utf8';
// $charset = strtolower( str_replace( '-', '', $charset ) );
// if (! in_array( $charset, array ('utf8','gbk') ))
// {
// $charset = 'utf8';
// }
$this->mConnecttion->exec( "SET NAMES $charset" );
}
}
/**
* 获取PDO实例，以便自己实现复杂查询
*
* @return PDO
*/
function GetConnecttion()
{
return $this->mConnecttion;
}
/**
* 初始化链式调用的缓存
*/
private function Init()
{
$this->mQueryType = '';
$this->mSql = '';
$this->mWhere = '';
$this->mOrder = '';
$this->mLimit = '';
$this->mData = array ();
}
/**
* 查询链Select部分
*
* @param string $talbe
* @param string|array $field
* @return PDOHelper
*/
function Select($talbe, $field = '*')
{
$this->Init();
$this->mQueryType = 's';
$field_str = is_array( $field ) ? '`' . implode( '`,`', $field ) . '`' : $field;
$this->mSql = 'SELECT ' . $field_str . ' FROM `' . $this->mPrefix . $talbe . '`';
return $this;
}
/**
* 查询链Insert部分
*
* @param string $talbe
* @param array $data
* @return PDOHelper
*/
function Insert($talbe, $data)
{
$this->Init();
$first = current( $data );
if (is_array( $first ))
{
// 多行插入
$fields = array_keys( $first );
$values = substr( str_repeat( '?,', count( $fields ) ), 0, - 1 );
$values_all = substr( str_repeat( '(' . $values . '),', count( $data ) ), 0, - 1 );
$this->mSql = 'INSERT INTO `' . $this->mPrefix . $talbe . '`(`' . implode( '`,`', $fields ) . '`) VALUES' . $values_all;
foreach ( $this->mData as $item )
{
$this->mData += $item;
}
}
else
{
// 单行插入
$fields = array_keys( $data );
$values = substr( str_repeat( '?,', count( $fields ) ), 0, - 1 );
$this->mSql = 'INSERT INTO `' . $this->mPrefix . $talbe . '`(`' . implode( '`,`', $fields ) . '`) VALUES(' . $values . ')';
$this->mData = $data;
}
return $this;
}
/**
* 查询链Update部分
*
* @param string $talbe
* @param array $data
* @return PDOHelper
*/
function Update($talbe, $data)
{
$this->Init();
$this->mQueryType = 'u';
$fields = array_keys( $data );
$this->mSql = 'UPDATE `' . $this->mPrefix . $talbe . '` SET ' . implode( '=?,', $fields ) . '=?';
$this->mData = $data;
return $this;
}
/**
* 查询链Delete部分
*
* @param string $talbe
* @return PDOHelper
*/
function Delete($talbe)
{
$this->Init();
$this->mQueryType = 'd';
$this->mSql = 'DELETE FROM `' . $this->mPrefix . $talbe . '`';
return $this;
}
/**
* 查询链Where部分
*
* @param string $str
* @param mixed $parameter
* @return PDOHelper
*/
function Where($str, $parameter = null)
{
if ($parameter !== null)
{
if (is_array( $parameter ))
{
$this->mData += $parameter;
// 根据实际传递的参数数目，替换in语句中的？，只能有一个in语句
$c1 = substr_count( $str, '?' );
$c2 = count( $parameter );
$replace = 'in(' . substr( str_repeat( '?,', $c2 - $c1 + 1 ), 0, - 1 ) . ')';
$str = str_replace( 'in(?)', $replace, $str );
}
else
{
$this->mData[] = $parameter;
}
}
$this->mWhere = " WHERE $str";
return $this;
}
/**
* 查询链Order部分
*
* @param string $str
* @return PDOHelper
*/
function Order($str)
{
$this->mOrder = " ORDER BY $str";
return $this;
}
/**
* 查询链Limit部分
*
* @param number $length
* @param number $begin
* @return PDOHelper
*/
function Limit($length = 10, $begin = 0)
{
$this->mLimit = " LIMIT $begin,$length";
return $this;
}
/**
* 直接Sql语句查询
*
* @param string $sql
* @param mixed $parameter
* @return PDOHelper
*/
function Sql($sql, $parameter = null)
{
$this->Init();
if ($parameter !== null)
{
if (is_array( $parameter ))
{
$this->mData = $parameter;
// 根据实际传递的参数数目，替换in语句中的？，只能有一个in语句
$c1 = substr_count( $sql, '?' );
$c2 = count( $parameter );
$replace = 'in(' . substr( str_repeat( '?,', $c2 - $c1 + 1 ), 0, - 1 ) . ')';
$sql = str_replace( 'in(?)', $replace, $sql );
}
else
{
$this->mData[] = $parameter;
}
}
// 自动为表名加前缀，需要时，请在表名前面加下划线并用反单引号括起来
$sql = str_replace( '`_', '`' . $this->mPrefix, $sql );
$this->mSql = $sql;
return $this;
}
/**
* 执行查询
*
* @return boolean
*/
function Execute()
{
if ($this->mConnecttion)
{
switch ($this->mQueryType)
{
case 's' :
$this->mSql .= $this->mWhere . $this->mOrder . $this->mLimit;
break;
case 'u' :
$this->mSql .= $this->mWhere;
break;
case 'd' :
$this->mSql .= $this->mWhere;
break;
}
//var_dump( $this->mSql );
//echo '<br/>';
if (empty( $this->mSql ))
{
$this->Err( 'Can not find SQL statement<br/>' );
return false;
}
if ($this->mPDOStatement = $this->mConnecttion->prepare( $this->mSql ))
{
$i = 1;
foreach ( $this->mData as $data )
{
// echo "<<$i:$data>><br/>";
if (! $this->mPDOStatement->bindValue( $i, $data ))
{
$this->Err( 'Error: PDOStatement::bindValue() ' . $i . '/' . count( $this->mData ) . '<br/>' );
return false;
}
++ $i;
}
if ($this->mPDOStatement->execute())
{
return true;
}
$this->Err( 'Error: PDOStatement::execute()<br/>' );
return false;
}
$this->Err( 'Error: PDOStatement::prepare()<br/>' );
}
return false;
}
/**
* 返回数据列表的二维关联数组
*
* @return array(array{}) | empty array | false
*/
function FetchAll()
{
if ($this->Execute())
{
return $this->mPDOStatement->fetchAll();
}
else
{
return false;
}
}
/**
* 返回数据行的一维关联数组
*
* @return array{} | empty array | false
*/
function FetchRow()
{
if ($this->Execute())
{
$rs = $this->mPDOStatement->fetch();
return $rs === false ? array () : $rs;
}
else
{
return false;
}
}
/**
* 返回第1行第1列的值
*
* @return mixed | false
*/
function FetchCell()
{
if ($this->Execute())
{
$rs = $this->mPDOStatement->fetchColumn();
return $rs === false ? null : $rs;
}
else
{
return false;
}
}
/**
* 返回插入数据的id
*
* @return string boolean
*/
function LastId()
{
if ($this->Execute())
{
return $this->mConnecttion->lastInsertId();
}
else
{
return false;
}
}
/**
* 返回实际受影响的行数
*
* @return number boolean
*/
function AffectedRows()
{
if ($this->Execute())
{
return $this->mPDOStatement->rowCount();
}
else
{
return false;
}
}
/**
* 调试模式下，显示错误信息
*
* @param string $msg
*/
private function Err($msg)
{
if ($this->mDebug)
{
echo $msg;
}
}
}