ORA-00942 未创建 oracle 中的 EXECUTE IMMEDIATE 临时表

Question

基于this answer，我试图创建临时表，但出现异常ORA-00942:table or view does not exist 我认为'CREATE OR REPLACE GLOBAL TEMPORARY TABLE TempQandA(column1 number) ON COMMIT PRESERVE ROWS' 语句有问题，它在insert into TempQandA(column1) VALUES (1); 上失败。
请在下面找到 SQL 语句。

DECLARE 
TransactioDetailId numeric := 3132;
HomePhoneNumber varchar(20);
MobileNumber varchar(20);
Email varchar(20);
whatever varchar(20);
BEGIN
EXECUTE IMMEDIATE 'CREATE OR REPLACE GLOBAL TEMPORARY TABLE TempQandA(column1 number) ON COMMIT PRESERVE ROWS';

        BEGIN
        SELECT contactvalue into HomePhoneNumber  FROM customercontact CC
         inner join TRANSACTIONMAIN tm on tm.customerid = CC.customerid
         inner join transactiondetail td on td.transactionid = tm.transactionid
         where contacttypeid = 2 and td.transactiondetailid = TransactioDetailId;
         EXCEPTION
         WHEN NO_DATA_FOUND THEN
         HomePhoneNumber := NULL;
                         begin
                         SELECT  contactvalue into MobileNumber  FROM customercontact CC
                         inner join TRANSACTIONMAIN tm on tm.customerid = CC.customerid
                         inner join transactiondetail td on td.transactionid = tm.transactionid
                         where contacttypeid = 3 and td.transactiondetailid = TransactioDetailId;
                         EXCEPTION
                         WHEN NO_DATA_FOUND THEN
                         MobileNumber := NULL;
                                      begin
                                      SELECT  contactvalue into Email  FROM customercontact CC
                                      inner join TRANSACTIONMAIN tm on tm.customerid = CC.customerid
                                      inner join transactiondetail td on td.transactionid = tm.transactionid
                                      where contacttypeid = 1 and td.transactiondetailid = TransactioDetailId;
                                      EXCEPTION
                                      WHEN NO_DATA_FOUND THEN
                                      Email := NULL;

                                            begin
                                            insert into TempQandA(column1) VALUES (1);
                                             end;
                                     end;
                     end;
         end;
END;

Answer 1

你动态地创建GTT，所以你的INSERT也应该是动态的..

请注意，PL/SQL 会在执行每个静态查询之前对其进行验证。 这就是为什么即使在编译时也会出现ORA-942 Table or view doesn't exist 错误的原因！

因此，为了逃避这种语义检查，我们必须使调用动态化。

    BEGIN
    EXECUTE IMMEDIATE 'CREATE GLOBAL TEMPORARY TABLE TempQandA(column1 number) ON COMMIT PRESERVE ROWS';

.....

    EXECUTE IMMEDIATE ' insert into TempQandA(column1) VALUES (1)';
    END;

最后，您不应该在运行时创建GTT。以避免此类问题。无论如何，GTT 都会本地到每个会话。

编辑：正如拉利特所说，GTT 的DDL 不接受CREATE OR REPLACE

Answer 2

'创建或替换全局临时表 TempQandA(column1 number) ON 提交保留行';

关键字REPLACE 不正确。您只需创建 GTT 并使用 EXECUTE IMMEDIATE 将值插入其中：

SQL> BEGIN
  2  EXECUTE IMMEDIATE 'CREATE GLOBAL TEMPORARY TABLE Temp_gtt(column1 number) ON COMMIT PRESERVE ROWS';
  3  EXECUTE IMMEDIATE 'insert into temp_gtt(column1) values(1)';
  4  END;
  5  /

PL/SQL procedure successfully completed.

SQL>
SQL> select * from temp_gtt;

   COLUMN1
----------
         1

SQL>