Php pdo准备的带有可变列表的语句

设置可以有多个可选筛选器的搜索

$sql = "SELECT *
        FROM table 
        WHERE title = :title 
        AND filter1 = :filter1 
        AND filter2 = :filter2 
        AND filter3 = :filter3";
$query = $dbc->prepare($sql);
$query->execute(
           array(
             ':title' => $title, 
             ':filter1' => $filter1,
             ':filter2' => $filter2, 
             ':filter3' => $filter3
           )
        );

此问题有时会导致筛选器变量为空。如果过滤器为空，则任何值都应起作用。我曾尝试将空过滤器设置为通配符（%），但这似乎不起作用

if(empty($filter1)) $filter1 = '%';

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您需要在execute（）中将它们有条件地添加到SQL和SQLDATA中

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在这种情况下，SQL QueryBuilder可能是一个不错的选择。

$filters = array(
  ':filter1': $filter1, 
  ':filter2': $filter2, 
  ':filter3': $filter3
);
$sql = "SELECT * FROM TABLE WHERE title = :title";
$sqldata = array(
  ':title' => $title
);
foreach ($filters as $key => $value) {
  $sql .= " AND $key=$value";
  $sqldata[$key] => $value;
}
$query = $dbc->prepare($sql);
$query->execute($sqldata);