如何在Oracle PLSQL中提交单个事务

Question

我需要编写一个PL/SQL过程,在这个过程中我需要在自己的事务边界内调用另一个过程,并且无论主事务的失败或提交如何都要提交它.换句话说,我需要像REQUIRES NEW事务传播这样的东西.

就像是:

procedure mainProcedure(arugements) is 
begin
    // some statements
    nestedProcedure(someArguments);
    // some other statements
end;

procedure nestedProcedure(arguments) is
begin
  // start a new transaction
  // some statements, lock some objects!
  // commit the new transaction and release locked objects
end;

我怎样才能做到这一点？

Answer 1

看看自治转换.另见demo

CREATE TABLE t (
 test_value VARCHAR2(25));

CREATE OR REPLACE PROCEDURE child_block IS
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
   INSERT INTO t
   (test_value)
   VALUES
   ('Child block insert');
  COMMIT; 
END child_block;
 /

CREATE OR REPLACE PROCEDURE parent_block IS

BEGIN
   INSERT INTO t
   (test_value)
   VALUES
   ('Parent block insert');

    child_block;

    ROLLBACK; 
END parent_block;
 /

执行:

 -- empty the test table
    TRUNCATE TABLE t;

   -- run the parent procedure
     exec parent_block;

   -- check the results
    SELECT * FROM t; 

Answer 2

您可以使用pragma autonomous_transaction. 它的作用与您所需要的相同。但不要忘记，在子事务中您将看不到上述事务的任何更新。

procedure mainProcedure(arugements) is 
begin
    // some statements
    nestedProcedure(someArguments);
    // some other statements
end;

procedure nestedProcedure(arguments) is
pragma autonomous_transaction;
begin
  // start a new transaction
  // some statements, lock some objects!
  // commit the new transaction and release locked objects
  commit; 
end;