有人请帮助我,为什么我总是得到这个错误,以及解决方案是什么:
失败:SQLSTATE[42000]:语法错误或访问冲突:1064 您的 SQL 语法有错误;检查与您的 MySQL 服务器版本相对应的手册,以在第 1 行的“5”附近使用正确的语法
类.database.inc.php
我写了这个类来自动化我的 sql 查询。效果很好,除非我想将值绑定到 SQL LIMIT 操作:
class Database extends PDO
{
private $engine;
private $host;
private $database;
private $user;
private $pass;
private $tablename;
private $valueArray;
private $optionArray;
public function __construct($engine,$charset,$host,$database,$user,$pass)
{
$this->engine = $engine;
$this->charset = $charset;
$this->host = $host;
$this->database = $database;
$this->user = $user;
$this->pass = $pass;
$dns = $this->engine.':dbname='.$this->database.';charset='.$this->charset.';host='.$this->host;
parent::__construct($dns,$this->user,$this->pass);
$this->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
private function runSQL($sql=NULL,$valueArray=NULL)
{
$sth = $this->prepare($sql);
if(isset($valueArray))
{
foreach($valueArray as $values)
{
foreach($values as $key => $value)
{
$paramDataType = $this->getPdoParamDataType($value);
$sth->bindValue($key,$value,$paramDataType);
}
$sth->execute($values);
}
}
else
{
$sth->execute();
}
return $sth;
}
private function getPdoParamDataType($variable)
{
$variableType = gettype($variable);
switch ($variableType)
{
case 'integer':
return PDO::PARAM_INT;
break;
case 'string':
return PDO::PARAM_STR;
break;
case 'double':
return PDO::PARAM_STR;
break;
case 'boolean':
return PDO::PARAM_BOOL;
break;
case 'NULL':
return PDO::PARAM_NULL;
break;
}
}
private function fetchRows($sth=NULL)
{
$result = $sth->fetchAll(PDO::FETCH_ASSOC);
return $result;
}
private function getTableStructure($tableName=NULL)
{
$this->tableName = $tableName;
$sql = 'DESCRIBE '.$this->tableName;
$tableStructureArray = $this->fetchRows($this->runSQL($sql));
return $tableStructureArray;
}
public function getRecords($tableName=NULL,$options=NULL,$valueArray=NULL)
{
$this->tableName = $tableName;
$this->valueArray = $valueArray;
$options=' '.$options;
$columnFields = $this->getTableStructure($this->tableName);
$sql = 'SELECT '.implode(', ',$columnFields).' FROM '.$tableName.$options;
return $this->fetchRows($this->runSQL($sql,$this->valueArray));
}
}
测试.php
这就是我使用它的方式:
function __autoload($class_name)
{
include_once 'classes/class.' . $class_name . '.inc.php';
}
$pdo = new Database('mysql','utf8','localhost','database','password','');
try
{
$valueArray = array(
array(':limit'=>5)
);
$pdo->beginTransaction();
$result = $pdo->getRecords('my table name','LIMIT :limit',$valueArray);
$pdo->commit();
}
catch (Exception $e)
{
$pdo->rollBack();
echo "Failed: " . $e->getMessage();
}
如果我改变这一行:
$result = $pdo->getRecords('my table name','LIMIT :limit',$valueArray);
对此:
$result = $pdo->getRecords('my table name','LIMIT 5');
它运作良好。
知道有什么问题吗?