[php] PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)

I do know that PDO does not support multiple queries getting executed in one statement. I've been Googleing and found few posts talking about PDO_MYSQL and PDO_MYSQLND.

PDO_MySQL is a more dangerous application than any other traditional MySQL applications. Traditional MySQL allows only a single SQL query. In PDO_MySQL there is no such limitation, but you risk to be injected with multiple queries.

From: Protection against SQL Injection using PDO and Zend Framework (June 2010; by Julian)

It seems like PDO_MYSQL and PDO_MYSQLND do provide support for multiple queries, but I am not able to find more information about them. Were these projects discontinued? Is there any way now to run multiple queries using PDO.

This question is related to php mysql pdo

The answer is


PDO does support this (as of 2020). Just do a query() call on a PDO object as usual, separating queries by ; and then nextRowset() to step to the next SELECT result, if you have multiple. Resultsets will be in the same order as the queries. Obviously think about the security implications - so don't accept user supplied queries, use parameters, etc. I use it with queries generated by code for example.

$statement = $connection->query($query);
do {
  $data[] = $statement->fetchAll(PDO::FETCH_ASSOC);
} while ($statement->nextRowset());

A quick-and-dirty approach:

function exec_sql_from_file($path, PDO $pdo) {
    if (! preg_match_all("/('(\\\\.|.)*?'|[^;])+/s", file_get_contents($path), $m))
        return;

    foreach ($m[0] as $sql) {
        if (strlen(trim($sql)))
            $pdo->exec($sql);
    }
}

Splits at reasonable SQL statement end points. There is no error checking, no injection protection. Understand your use before using it. Personally, I use it for seeding raw migration files for integration testing.


Tried following code

 $db = new PDO("mysql:host={$dbhost};dbname={$dbname};charset=utf8", $dbuser, $dbpass, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));

Then

 try {
 $db->query('SET NAMES gbk');
 $stmt = $db->prepare('SELECT * FROM 2_1_paidused WHERE NumberRenamed = ? LIMIT 1');
 $stmt->execute(array("\xbf\x27 OR 1=1 /*"));
 }
 catch (PDOException $e){
 echo "DataBase Errorz: " .$e->getMessage() .'<br>';
 }
 catch (Exception $e) {
 echo "General Errorz: ".$e->getMessage() .'<br>';
 }

And got

DataBase Errorz: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '/*' LIMIT 1' at line 1

If added $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); after $db = ...

Then got blank page

If instead SELECT tried DELETE, then in both cases got error like

 DataBase Errorz: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '* FROM 2_1_paidused WHERE NumberRenamed = '¿\' OR 1=1 /*' LIMIT 1' at line 1

So my conclusion that no injection possible...


Try this function : mltiple queries and multiple values insertion.

function employmentStatus($Status) {
$pdo = PDO2::getInstance();

$sql_parts = array(); 
for($i=0; $i<count($Status); $i++){
    $sql_parts[] = "(:userID, :val$i)";
}

$requete = $pdo->dbh->prepare("DELETE FROM employment_status WHERE userid = :userID; INSERT INTO employment_status (userid, status) VALUES ".implode(",", $sql_parts));
$requete->bindParam(":userID", $_SESSION['userID'],PDO::PARAM_INT);
for($i=0; $i<count($Status); $i++){
    $requete->bindParam(":val$i", $Status[$i],PDO::PARAM_STR);
}
if ($requete->execute()) {
    return true;
}
return $requete->errorInfo();
}

Like thousands of people, I'm looking for this question:
Can run multiple queries simultaneously, and if there was one error, none would run I went to this page everywhere
But although the friends here gave good answers, these answers were not good for my problem
So I wrote a function that works well and has almost no problem with sql Injection.
It might be helpful for those who are looking for similar questions so I put them here to use

function arrayOfQuerys($arrayQuery)
{
    $mx = true;
    $conn->beginTransaction();
    try {
        foreach ($arrayQuery AS $item) {
            $stmt = $conn->prepare($item["query"]);
            $stmt->execute($item["params"]);
            $result = $stmt->rowCount();
            if($result == 0)
                $mx = false;
         }
         if($mx == true)
             $conn->commit();
         else
             $conn->rollBack();
    } catch (Exception $e) {
        $conn->rollBack();
        echo "Failed: " . $e->getMessage();
    }
    return $mx;
}

for use(example):

 $arrayQuery = Array(
    Array(
        "query" => "UPDATE test SET title = ? WHERE test.id = ?",
        "params" => Array("aa1", 1)
    ),
    Array(
        "query" => "UPDATE test SET title = ? WHERE test.id = ?",
        "params" => Array("bb1", 2)
    )
);
arrayOfQuerys($arrayQuery);

and my connection:

    try {
        $options = array(
            //For updates where newvalue = oldvalue PDOStatement::rowCount()   returns zero. You can use this:
            PDO::MYSQL_ATTR_FOUND_ROWS => true
        );
        $conn = new PDO("mysql:host=$servername;dbname=$database", $username, $password, $options);
        $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    } catch (PDOException $e) {
        echo "Error connecting to SQL Server: " . $e->getMessage();
    }

Note:
This solution helps you to run multiple statement together,
If an incorrect a statement occurs, it does not execute any other statement


After half a day of fiddling with this, found out that PDO had a bug where...

--

//This would run as expected:
$pdo->exec("valid-stmt1; valid-stmt2;");

--

//This would error out, as expected:
$pdo->exec("non-sense; valid-stmt1;");

--

//Here is the bug:
$pdo->exec("valid-stmt1; non-sense; valid-stmt3;");

It would execute the "valid-stmt1;", stop on "non-sense;" and never throw an error. Will not run the "valid-stmt3;", return true and lie that everything ran good.

I would expect it to error out on the "non-sense;" but it doesn't.

Here is where I found this info: Invalid PDO query does not return an error

Here is the bug: https://bugs.php.net/bug.php?id=61613


So, I tried doing this with mysqli and haven't really found any solid answer on how it works so I thought I's just leave it here for those who want to use it..

try{
    // db connection
    $mysqli = new mysqli("host", "user" , "password", "database");
    if($mysqli->connect_errno){
        throw new Exception("Connection Failed: [".$mysqli->connect_errno. "] : ".$mysqli->connect_error );
        exit();
    }

    // read file.
    // This file has multiple sql statements.
    $file_sql = file_get_contents("filename.sql");

    if($file_sql == "null" || empty($file_sql) || strlen($file_sql) <= 0){
        throw new Exception("File is empty. I wont run it..");
    }

    //run the sql file contents through the mysqli's multi_query function.
    // here is where it gets complicated...
    // if the first query has errors, here is where you get it.
    $sqlFileResult = $mysqli->multi_query($file_sql);
    // this returns false only if there are errros on first sql statement, it doesn't care about the rest of the sql statements.

    $sqlCount = 1;
    if( $sqlFileResult == false ){
        throw new Exception("File: '".$fullpath."' , Query#[".$sqlCount."], [".$mysqli->errno."]: '".$mysqli->error."' }");
    }

    // so handle the errors on the subsequent statements like this.
    // while I have more results. This will start from the second sql statement. The first statement errors are thrown above on the $mysqli->multi_query("SQL"); line
    while($mysqli->more_results()){
        $sqlCount++;
        // load the next result set into mysqli's active buffer. if this fails the $mysqli->error, $mysqli->errno will have appropriate error info.
        if($mysqli->next_result() == false){
            throw new Exception("File: '".$fullpath."' , Query#[".$sqlCount."], Error No: [".$mysqli->errno."]: '".$mysqli->error."' }");
        }
    }
}
catch(Exception $e){
    echo $e->getMessage(). " <pre>".$e->getTraceAsString()."</pre>";
}

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