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        Oracle PL/SQL之DDL導(dǎo)致的隱式提交

        發(fā)布時間:  2012/8/26 15:59:23

        1. 如果DDL語法正確,即使執(zhí)行失敗,也會導(dǎo)致隱式提交:

        duzz$scott@orcl>create table t1 as select * from dept;

        Table created.

        Elapsed: 00:00:00.03

        duzz$scott@orcl>update t1 set loc='xx' where deptno=10;
        -
         

        1 row updated.

        Elapsed: 00:00:00.03

        duzz$scott@orcl>drop table xx;

        drop table xx

                   *

        ERROR at line 1:

        ORA-00942: table or view does not exist

        Elapsed: 00:00:00.01


        +++++++++++++++++++++++++++++++++++++++++++++++++++++

        duzz$sys@orcl>select * from scott.t1;

         

            DEPTNO DNAME                                      LOC

        ---------- ------------------------------------------ ---------------------------------------

                10 ACCOUNTING                                 xx

                20 RESEARCH                                   DALLAS

                30 SALES                                      CHICAGO

                40 OPERATIONS                                 BOSTON

        Elapsed: 00:00:00.01

        2. 如果DDL語法錯誤,則不會導(dǎo)致隱式提交,亦不會自動回滾事務(wù):

        duzz$scott@orcl>update t1 set loc='yy' where deptno=20;

        1 row updated.

        Elapsed: 00:00:00.00

        duzz$scott@orcl>drop table col xx;

        drop table col xx

                       *

        ERROR at line 1:

        ORA-00933: SQL command not properly ended

        Elapsed: 00:00:00.00

        +++++++++++++++++++++++++++++++++++++++++++++++++++++

        duzz$sys@orcl>select * from scott.t1;

            DEPTNO DNAME                                      LOC

        ---------- ------------------------------------------ ---------------------------------------

                10 ACCOUNTING                                 xx

                20 RESEARCH                                   DALLAS

                30 SALES                                      CHICAGO

                40 OPERATIONS                                 BOSTON

        Elapsed: 00:00:00.00

        總結(jié):

        DDL偽代碼:

        Begin

        Parse DDL;

        Commit;

        Do DDL;

        Exception

        When others then

        Null;

        End


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