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我刚开始玩PDO,我试图创建一个函数来显示给定表名的所有数据。在阅读了几篇文章后,我发现了一个解决方案,我可以开始工作(下面用硬编码的select语句显示)。然而,当我绑定我的字段名称时,我无法让我的execute语句正常工作(我得到的异常类似于:Undefined index:person_id)。我应该提及我的类扩展PDO:PHP - (PDO)使用绑定变量执行
/*********************************************************************
*Function showTable
*Purpose Display all information for a given table.
*Params $sTable -> Table name
********************************************************************/
public function showTable($sTable)
{
$result;
try
{
if(isset($sTable))
{
//create a result in a table format
$result = "<table>";
//$stmt = $this->prepare('DESCRIBE :sTable');
$stmt = $this->prepare('DESCRIBE ' . $sTable);
//$stmt->bindParam(':sTable', $sTable);
$stmt->execute();
//array version of the column names
$aCols = $stmt->fetchAll(PDO::FETCH_COLUMN);
//string version of the column names
$sCols = implode (", ", $aCols);
//$stmt = $this->prepare('SELECT :fields FROM :sTable');
//$stmt = $this->prepare('SELECT :fields FROM person');
$stmt = $this->prepare('SELECT person_id, first_name, last_name FROM person');
//$stmt->execute(array(':fields'=>$sCols, 'stable'=>$sTable));
//$stmt->execute(array(':fields'=>$sCols));
$stmt->execute();
while($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
var_dump($row);
$result = $result . "<tr>";
foreach($aCols as $col)
{
//var_dump($row);
$result = $result . " <td>" . $row[$col]. "</td>";
}
$result = $result . "</tr>";
}
$result = $result . "</table>";
}
return $result;
}
catch(PDOException $e)
{
if($this->bDebug)
{
echo $e->getMessage();
}
}
}
就像我说的硬编码的选择string作品,但是当我注释掉硬编码,并取消它引发异常绑定的执行。
哦,我现在明白了。非常感谢你。我会尽快设置为可接受的答案。 – Travis
有了这些信息,我按照我想要的方式工作,再次感谢 – Travis