匿名 PL/SQL 块检查异常

Question

我试图在我的匿名 PL/SQL 块中捕获异常

DECLARE
    ...

BEGIN
FOR herstell_row IN (
    ...
) 
LOOP
    ...

    DECLARE
        table_does_not_exists exception;
        pragma exception_init( table_does_not_exists, -942 );
    BEGIN
        INSERT INTO SMART_MONITORING_MACHINE_NAV_B (
            MACHINE, 
            NAVIGATION_LEVEL_ID
        ) 
        SELECT 
            old_binding.MACHINE, 
            pv_id 
        FROM 
            SMART_MACHINE_NAV_BINDING old_binding
        WHERE
            old_binding.NAVIGATION_LEVEL_ID = herstell_row.HENAME1;
    EXCEPTION
        WHEN table_does_not_exists THEN null;
    END;

END LOOP;
END;

我知道 table SMART_MACHINE_NAV_BINDING 在我的案例中不存在，所以我需要嵌套的匿名块来忽略它的代码。但我总是得到这个错误：

Error report - ORA-06550: line 41, column 14: PL/SQL: ORA-00942: table or view does not exist ORA-06550: line 33, column 10: PL/SQL: SQL Statement ignored

Answer 1

Oracle 不知道这个错误table_does_not_exists它是用户定义的，所以你应该在其他人那时处理，例如。

Exception
  When Others then
     null;
  -- or at this time you can raise your error table_does_not_exists
    raise table_does_not_exists;
  -- and handle it in another parent block
end;
Exception
   when table_does_not_exists then
     null;
end;

Answer 2

你不能用不存在的 table 编译代码，但你可以尝试使用 EXECUTE EMMEDIATE:

来执行它

DECLARE
    ...

BEGIN
FOR herstell_row IN (
    ...
) 
LOOP
    ...

    DECLARE
        table_does_not_exists exception;
        pragma exception_init( table_does_not_exists, -942 );
    BEGIN
      execute immediate 
        'INSERT INTO SMART_MONITORING_MACHINE_NAV_B (
            MACHINE, 
            NAVIGATION_LEVEL_ID
        ) 
        SELECT 
            old_binding.MACHINE, 
            pv_id 
        FROM 
            SMART_MACHINE_NAV_BINDING old_binding
        WHERE
            old_binding.NAVIGATION_LEVEL_ID = :P' using herstell_row.HENAME1;
    EXCEPTION
        WHEN table_does_not_exists THEN null;
    END;

END LOOP;
END;

此外，您在这里不需要例外，您可以使用系统视图检查 table 是否存在：

declare
  table_created number;
begin
  select count(*)
    into table_created
    from all_tables
   where table_name = ...
     and owner = ...;

  if table_created > 0 then
     execute immediate 'insert into ...';
  end if;
end;

有关 EXECUTE IMMEDIATE 语句的更多信息：http://docs.oracle.com/cd/E11882_01/appdev.112/e25519/executeimmediate_statement.htm#LNPLS01317

匿名 PL/SQL 块检查异常

Anonymous PL/SQL block checked exception

plsql

exception-handling

oracle11g