PDO请求只返回一个应该有更多的结果

时间:2012-10-03 10:04:16

标签: php mysql pdo

我创建了这个功能:

<?php

$pdo_db = new PDO( 'mysql:host=' . $db_host . ';dbname=' . $db_name, $db_user_name, $db_password );

function qlist_pdo( $fields, $tables, $where_fields='', $where_values='', $order='', $limit='' ) {

GLOBAL $pdo_db; // ignore this, it will be in class later. This is just for test purposes

if ( $order ) $order = ' ORDER BY ' . $order;
if ( $limit ) $limit = ' LIMIT ' . $limit; 

if ( is_array( $where_fields ) && is_array( $where_values ) && isset( $where_fields ) && isset( $where_values ) ) {

    if ( sizeof( $where_fields ) != sizeof( $where_values ) ) {
        die( "Query error: where <strong>field</strong> count doesn't match <strong>value</strong> count!" );
    } else {

        $where = ' WHERE ';
        foreach( $where_fields as $key => $value ) {
            $where .= $key . ' ' . $value . '=? ';
        }
        $where = substr( $where, 0, -1 );

        echo $query = "SELECT " . $fields . " FROM " . $tables . $where . $order . $limit;
        $qp = $pdo_db -> prepare( $query );

        foreach ( $where_values as $key => $val ) {
            $qp -> bindParam( $key+1, $val );
        }           

    }

} else {
    echo $query = "SELECT " . $fields . " FROM " . $tables . $order . $limit;
    $qp = $pdo_db -> prepare( $query );
}

$qp -> execute();
$result = $qp -> fetchAll();

return $result;

}

?>

我称之为:

$result = qlist_pdo( "*", "list", array( '' => 'id', 'OR' => 'id' ), array( '2', '8' ), 'id DESC' );

它工作正常,但是当我设置where参数时,结果只给出了一行(它应该是2)。如果我没有像这样的参数调用它:

$result = qlist_pdo( "*", "list", '', '', 'id DESC' );

返回所有行。为什么这样,我做错了什么?

生成查询:

SELECT * FROM list WHERE id=? OR id=? ORDER BY id DESC

生成的参数:

1, 2
2, 8  

[编辑] 看起来它只添加第二个参数。如果我将OR更改为AND,它仍会提供一个结果,即使它根本不应该提供任何行(因为不能有ID = 2 AND ID = 8选项)。

[EDIT2] 我设置了查询日志,得到了我的想法。实际查询为SELECT * FROM list WHERE id='8' OR id='8' ORDER BY id DESC

2 个答案:

答案 0 :(得分:0)

您将参数作为字符串传递,但它们是整数。

我建议以不同的方式传递数组:

$result = 
   qlist_pdo( "*", "list", 
   array( '' => 'id', 'OR' => 'id' ), array( 2, 8 ), 'id DESC' );

您的功能应如下所示:

function qlist_pdo( $fields, $tables, $where_fields = '', $where_values = '', $order = '', $limit = '' )
{
  if ( $order )
    $order = ' ORDER BY ' . $order;
  if ( $limit )
    $limit = ' LIMIT ' . $limit;

  if ( is_array( $where_fields ) && is_array( $where_values ) && isset( $where_fields ) && isset( $where_values ) ) 
  {

    if ( sizeof( $where_fields ) != sizeof( $where_values ) ) {
      die( "Query error: where <strong>field</strong> count doesn't match <strong>value</strong> count!" );
    } 
    else {

      $where = ' WHERE ';
      $p = 0;
      foreach ( $where_fields as $key => $value ) {
        $where .= $key . ' ' . $value . '= :p' . $p . ' ';
        $p++;
      }
      $where = substr( $where, 0, -1 );

      echo $query = "SELECT " . $fields . " FROM " . $tables . $where . $order . $limit; // . '<br>';
      $qp = $pdo_db->prepare( $query );

      foreach ( $where_values as $key => $val ) {
        $qp -> bindParam( ":p$key", $val, PDO::PARAM_INT );
        //echo ":p$key" . '<br>';
      }

    }

  } 
  else {
    echo $query = "SELECT " . $fields . " FROM " . $tables . $order . $limit;
    $qp = $pdo_db->prepare( $query );
  }
}

当删除输出的注释时,我得到了这个结果(对我来说似乎没问题)

SELECT * FROM list WHERE id= :p0 OR id= :p1 ORDER BY id DESC
:p0
:p1

答案 1 :(得分:0)

嗯,这很奇怪,但似乎我在绑定参数时需要一个参考。

而不是:

foreach ( $where_values as $key => $val ) {

我需要:

foreach ( $where_values as $key => &$val ) {

不知道为什么,但&amp; 是我需要添加到代码中的唯一内容。