在MySQL工作台中查询工作，但在PHP中查询工作

Question

我有相当复杂的SQL状态，它们正在使用变量。

整个块在MySQL工作台中运行良好。

但是，如果我想在PHP端执行相同的代码，那么它就不会瞎眼了。

mysqli_select_db($conn, "$settings_database");
$sql = "
    SET @id := null;

    UPDATE incidents.enrichment
    SET enrichment.ManualEnricher4State = 1
    WHERE ParentTableId = @id :=    (
                                        SELECT * FROM   (
                                                            SELECT enr.ParentTableId
                                                            FROM  incidents.enrichment AS enr
                                                            WHERE enr.ManualEnricher1State Is NULL
                                                            AND (
                                                                    enr.ManualEnricher4State Is NULL 
                                                                        OR 
                                                                    enr.ManualEnricher4State = 2
                                                                )
                                                            LIMIT 1
                                                        ) as x
                                    );
    select @id;
";
$sql = mysqli_query($conn, $sql);
$row = mysqli_fetch_array($sql);
var_dump($row);

可能由于某种原因，PHP mysql连接器存在变量问题吗？

简单的查询工作正常......

在这个例子中，mysqli_query的结果只是假......

感谢您的帮助 - 同时我找到了解决方案：

在单个查询中执行那些东西，一切正常......

$sql = "SET @id := null;";
$sql = mysqli_query($conn, $sql);   

$sql = "
    UPDATE incidents.enrichment
    SET enrichment.ManualEnricher4State = 1
    WHERE ParentTableId = @id :=    (
                                        SELECT * FROM   (
                                                            SELECT enr.ParentTableId
                                                            FROM  incidents.enrichment AS enr
                                                            WHERE enr.ManualEnricher1State Is NULL
                                                            AND (
                                                                    enr.ManualEnricher4State Is NULL 
                                                                        OR 
                                                                    enr.ManualEnricher4State = 2
                                                                )
                                                            LIMIT 1
                                                        ) as x
                                    );
";
$sql = mysqli_query($conn, $sql);

$sql = "select @id;";
$sql = mysqli_query($conn, $sql);