Question

我通过SQL通过TRANSACTION通过一个体积适中的PDO服务器$sql = "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; BEGIN TRANSACTION; DECLARE @id [int]; //Check whether specific record exists with a SELECT //If it doesn't, create records on two tables //Check whether record exists again with another sSELECT (it will now) and assign the selected ID to @id //Update records on the two tables where ID = @id COMMIT TRANSACTION;";，格式如下：

UPSERT

这很好，我可以整天fetch()。但是，我想检索@id的值来更新调用对象以供以后使用，理想情况下无需编写另一个单独的选择查询，并且无法找到可靠的获取方法。

INSERTs在不需要UPDATEs时将其恢复（即记录存在，因此只调用INSERTs），而不是在调用tests.sort(function(a, b) { var diff = a.title.localeCompare(b.title); return diff == 0 ? (a.modifiedDate ? a.modifiedDate.getTime() : Infinity) - (b.modifiedDate ? b.modifiedDate.getTime() : Infinity) : diff; })时。< / p>

Answer 1

事实证明，经过大量的实验，问题是第一个SELECT语句 - 当记录存在时，它返回一个值，当记录不存在时，它没有。添加第二个SELECT最初似乎没有帮助，因为它是一个单独的结果行。因此，解决方案是在获取数组内容之前将结果集提前一个。

工作查询格式：

$sql = "SET NOCOUNT ON
            SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
            BEGIN TRANSACTION;
                DECLARE @id int;
                //Check whether specific record exists with a SELECT
                //If it doesn't, create records on two tables
                //Check whether record exists again with another SELECT (it will now) and assign the selected ID to @id
                //Update records on the two tables where ID = @id
                SELECT @id AS testID
            COMMIT TRANSACTION;";
 $stmt = $this->_db->prepare($sql);
 $stmt->execute();
 $stmt->nextRowset();
 $result = $stmt->fetch(PDO::FETCH_ASSOC);
 $testID = $result['testID'];
 return $testID;

从PDO SQL Server事务返回值

1 个答案: