php - mysqli_multi_query 不返回任何值

Question

我在 mysqli_multi_query 的帮助下触发了以下查询。哪个执行正确但没有返回任何值。它返回空白。 mysqli_multi_query 有什么问题，或者是否有任何替代方法可以在 codeigniter 中触发多个查询。

   $sql="LOCK TABLE xp_subunit WRITE; ";
    $sql .= "SELECT @myLeft := ".$_GET['lft'].", @myRight :=  ".$_GET['rgt'].", @myWidth :=  ".$_GET['lft']." - lft + 1
    FROM xp_subunit
    WHERE id =".$_GET['id']."; ";

    $sql .= "DELETE FROM xp_subunit WHERE lft BETWEEN @myLeft AND @myRight; ";

    $sql .= "UPDATE xp_subunit SET rgt = rgt - @myWidth WHERE rgt > @myRight; ";
    $sql .= "UPDATE xp_subunit SET lft = lft - @myWidth WHERE lft > @myRight; ";
    $sql.="UNLOCK TABLES;";

    //echo $sql;
    $query = $this->db->mysqli_multi_query($sql);

Answer 1

只需尝试以下示例。,

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
$mysqli->multi_query($query);
?>

我认为这可能会帮助您找到解决方案。