Question

我有一个事务，其中有多个操作，例如创建表，截断表和插入。当任何操作失败时，我将回滚事务。在此过程中，除一个表外，所有表都将回滚。

        try{
        $conn = $this->_getconnetion();
        $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);  
        $conn->setAttribute(PDO::ATTR_TIMEOUT, 600);
        $sqlE = 'CREATE TABLE IF NOT EXISTS pext ("col1" varchar, "col2" varchar, "col3" varchar, "col4" varchar, "col5" varchar)';
        $stmt = $conn->prepare($sqlE);
        $stmt->execute();

        $sql1 = 'CREATE TABLE IF NOT EXISTS PreProducts ( like public."Products");';
        $stmt = $conn->prepare($sql1);
        $stmt->execute();
        $sql2 = 'CREATE TABLE IF NOT EXISTS TempTable1 AS SELECT * FROM public."Products";';
        $stmt = $conn->prepare($sql2);
        $stmt->execute();

        $conn->beginTransaction();

        $truc1 = 'TRUNCATE TABLE PreProducts';
        $stmt = $conn->prepare($truc1);
        $stmt->execute();

        $trunc2 = 'TRUNCATE TABLE TempTable1';
        $stmt = $conn->prepare($trunc2);
        $stmt->execute();

        $sql3 = 'INSERT INTO TempTable1 SELECT * FROM public."Products"';
        $stmt = $conn->prepare($sql3);
        $stmt->execute();

        $trunc3 = 'TRUNCATE TABLE public."Products" CASCADE';
        $stmt = $conn->prepare($trunc3);
        $stmt->execute();

        $sql4 = 'INSERT INTO public."Products" SELECT * FROM TempTable1 WHERE "ProductTy" = \'X\';';
        $stmt = $conn->prepare($sql4);
        $stmt->execute();

        // Execute script to insert records for existing images only
        $output = productlogoimport($conn);

        $conn->commit();

        $logmsg = "Import | Multi | Multi product successfully executed.";
        $logged = $this->savelog($logmsg);
        } catch (PDOException $e){
            echo $logmsg = "Error |  " .$e->getMessage();
            $logged = $this->savelog($logmsg);
            $conn->rollBack();
        }
        finally {
            $this->_destroyconnection($conn);
        }

现在执行'TRUNCATE TABLE public."Products" CASCADE'语句时，它将截断2个表，即。 ProductExt和ProductImg。此语句假定 $ sql4 执行失败后，它将引发异常，并执行catch中存在的代码以回滚事务。

现在回滚完成后，它会使用脚本（PHP）回滚除ProductExt以外的所有表。

当我在pgAdmin上执行此语句时，即postgres的GUI，它按预期工作。回滚所有表，包括 ProductExt

  begin transaction 

  TRUNCATE TABLE public."Products" CASCADE
  select * from  "preproducts"

  select * from "Products"

  select * from "ProductExt"

  select * from "tempproducts"

  rollback

当我调试应用程序时，发现存在FK约束，该约束阻止通过程序进行回滚。

下面是ProductExt上存在的约束。当我删除此约束时，代码运行良好，但我需要此约束。我该如何实现。

  ALTER TABLE public."ProductExt"
  ADD CONSTRAINT "FK_ProductExt_Products_ProductId" FOREIGN KEY ("ProductId")
  REFERENCES public."Products" ("Id") MATCH SIMPLE
  ON UPDATE NO ACTION ON DELETE RESTRICT;

我也很清楚该事务在具有约束的GUI中可以正常工作，而不能在PHP脚本中正常工作。

Postgres无法回滚，GUI中的查询工作正常，PHP脚本失败

0 个答案: