我很好奇是否有可能使用PDO将值数组绑定到占位符。这里的用例试图传递一个值数组，以便与IN()条件一起使用。
我希望能够这样做:
<?php
$ids=array(1,2,3,7,8,9);
$db = new PDO(...);
$stmt = $db->prepare(
'SELECT *
FROM table
WHERE id IN(:an_array)'
);
$stmt->bindParam('an_array',$ids);
$stmt->execute();
?>
并让PDO绑定并引用数组中的所有值。
目前我正在做:
<?php
$ids = array(1,2,3,7,8,9);
$db = new PDO(...);
foreach($ids as &$val)
$val=$db->quote($val); //iterate through array and quote
$in = implode(',',$ids); //create comma separated list
$stmt = $db->prepare(
'SELECT *
FROM table
WHERE id IN('.$in.')'
);
$stmt->execute();
?>
这当然是工作，但只是想知道是否有一个内置的解决方案，我错过了?
在MySQL和PDO中，我们可以使用JSON数组和JSON_CONTAINS() (https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html#function_json-contains)进行搜索。
$ids = [123, 234, 345, 456]; // Array of users I search
$ids = json_encode($ids); // JSON conversion
$sql = <<<SQL
SELECT ALL user_id, user_login
FROM users
-- Cast is mandatory beaucause JSON_CONTAINS() waits JSON doc candidate
WHERE JSON_CONTAINS(:ids, CAST(user_id AS JSON))
SQL;
$search = $pdo->prepare($sql);
$search->execute([':ids' => $ids]);
$users = $search->fetchAll();
我们也可以使用JSON_TABLE() (https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html#function_json-table)进行更复杂的情况和JSON数据探索:
$users = [
['id' => 123, 'bday' => ..., 'address' => ...],
['id' => 234, 'bday' => ..., 'address' => ...],
['id' => 345, 'bday' => ..., 'address' => ...],
]; // I'd like to know their login
$users = json_encode($users);
$sql = <<<SQL
SELECT ALL user_id, user_login
FROM users
WHERE user_id IN (
SELECT ALL user_id
FROM JSON_TABLE(:users, '$[*]' COLUMNS (
-- Data exploration...
-- (if needed I can explore really deeply with NESTED kword)
user_id INT PATH '$.id',
-- I could skip these :
user_bday DATE PATH '$.bday',
user_address TINYTEXT PATH '$.address'
)) AS _
)
SQL;
$search = $pdo->prepare($sql);
$search->execute([':users' => $users]);
...
你可以这样转换:
$stmt = $db->prepare('SELECT * FROM table WHERE id IN('.$in.')');
在此:
$stmt = $db->prepare('SELECT * FROM table WHERE id IN(:id1, :id2, :id3, :id7, :id8, :id9)');
然后用这个数组执行它:
$stmt->execute(array(
:id1 =>1, :id2 =>2, :id3 =>3, :id7 =>7, :id8 =>8, :id9 => 9
)
);
因此:
$in = array();
$consultaParam = array();
foreach($ids as $k => $v){
$in[] = ':id'.$v;
$consultaParam[':id'.$v] = $v;
}
最后的代码:
$ids = array(1,2,3,7,8,9);
$db = new PDO(...);
$in = array();
$consultaParam = array();
foreach($ids as $k => $v){
$in[] = ':id'.$v;
$consultaParam[':id'.$v] = $v;
}
$stmt = $db->prepare(
'SELECT *
FROM table
WHERE id IN('.$in.')'
);
$stmt->execute($consultaParam);
我有一个独特的问题，在将即将被弃用的MySQL驱动程序转换为PDO驱动程序时，我必须创建一个函数，该函数可以动态地从相同的参数数组中构建正常参数和INs。所以我很快就做了这个:
/**
* mysql::pdo_query('SELECT * FROM TBL_WHOOP WHERE type_of_whoop IN :param AND siz_of_whoop = :size', array(':param' => array(1,2,3), ':size' => 3))
*
* @param $query
* @param $params
*/
function pdo_query($query, $params = array()){
if(!$query)
trigger_error('Could not query nothing');
// Lets get our IN fields first
$in_fields = array();
foreach($params as $field => $value){
if(is_array($value)){
for($i=0,$size=sizeof($value);$i<$size;$i++)
$in_array[] = $field.$i;
$query = str_replace($field, "(".implode(',', $in_array).")", $query); // Lets replace the position in the query string with the full version
$in_fields[$field] = $value; // Lets add this field to an array for use later
unset($params[$field]); // Lets unset so we don't bind the param later down the line
}
}
$query_obj = $this->pdo_link->prepare($query);
$query_obj->setFetchMode(PDO::FETCH_ASSOC);
// Now lets bind normal params.
foreach($params as $field => $value) $query_obj->bindValue($field, $value);
// Now lets bind the IN params
foreach($in_fields as $field => $value){
for($i=0,$size=sizeof($value);$i<$size;$i++)
$query_obj->bindValue($field.$i, $value[$i]); // Both the named param index and this index are based off the array index which has not changed...hopefully
}
$query_obj->execute();
if($query_obj->rowCount() <= 0)
return null;
return $query_obj;
}
它仍然未经测试，但逻辑似乎是存在的。
经过一些测试，我发现:
PDO不喜欢’。’(如果你问我的话，我觉得这有点蠢)
bindParam是错误函数，bindValue是正确函数。
因为我做了很多动态查询，所以这是我做的一个超级简单的helper函数。
public static function bindParamArray($prefix, $values, &$bindArray)
{
$str = "";
foreach($values as $index => $value){
$str .= ":".$prefix.$index.",";
$bindArray[$prefix.$index] = $value;
}
return rtrim($str,",");
}
像这样使用它:
$bindString = helper::bindParamArray("id", $_GET['ids'], $bindArray);
$userConditions .= " AND users.id IN($bindString)";
返回一个字符串:id1，:id2，:id3，并更新你的$bindArray绑定，当你需要运行你的查询时。简单!
