Question

我在测试一些SQL命令时创建了很多表和用户，现在我不记得所有的表和用户的名字。

但现在我想为我的大项目删除所有内容。那么是否可以在SQL命令行中删除它？

Answer 1

执行此命令：

BEGIN
   FOR table_ IN (SELECT * FROM dba_tables where owner like 'YOUR_SCHEMA') LOOP
       execute immediate 'truncate table ' || table_.owner || '.' || table_.table_name ||' cascade';
   END LOOP;
END;
/

Answer 2

您有两种方式：

你可以使用函数delete而不是truncate这个函数你不应该禁用约束，但它的工作速度会慢一些，因为如果你这样做就可以回滚这个操作：

BEGIN

  FOR table_ IN (SELECT * FROM dba_tables where owner like 'YOUR_SCHEMA') LOOP
   execute immediate 'delete from table ' || table_.owner || '.' || table_.table_name;
  END LOOP;
END;

使用truncate它会更快，但您必须在表格上禁用约束：

begin

  for disable_constraint_ in
    (select * from dba_constraints where owner= 'YOUR_SCHEMA'
  )
  loop
  execute immediate 'alter table ' || disable_constraint_.owner || '.' || disable_constraint_.table_name ||' disable constraint '|| disable_constraint_.constraint_name;
  end loop;
  for table_ in (select * from dba_tables where owner = 'YOUR_SCHEMA')
  loop
    execute immediate 'truncate table ' || table_.owner || '.' ||table_.table_name ||' cascade';
  end loop;
  for enable_constaint_ in (select * from dba_constraints where owner= 'YOUR_SCHEMA')
  loop
  execute immediate 'alter table ' || enable_constaint_.owner || '.' || enable_constaint_.table_name ||' enable constraint '|| enable_constaint_.constraint_name;
 end loop;
end;

Answer 3

   BEGIN

        FOR T in (SELECT table_name FROM user_tables) LOOP
          EXECUTE IMMEDIATE 'ALTER TABLE '||T.table_name||' DISABLE ALL CONSTRAINTS';
          --This will disable all the constraint  
        END LOOP;


        FOR T in (SELECT table_name FROM user_tables) LOOP
          EXECUTE IMMEDIATE 'TRUNCATE TABLE '||T.table_name;
        END LOOP;

        FOR T in (SELECT table_name FROM user_tables) LOOP
          EXECUTE IMMEDIATE 'ALTER TABLE '||T.table_name||' ENABLE ALL CONSTRAINTS';
        END LOOP;
    END;

更改表...禁用所有约束抛出ORA-01735：如果没有为表定义约束，则抛出ALTER TABLE选项无效，如果至少有一个表没有，则会导致脚本无法截断每个表约束。您可能希望将execute immediate放在begin -exception块

中

Answer 4

此PL / SQL块将对删除oracle数据库中的所有数据很有用

BEGIN
   FOR cur_rec IN (SELECT object_name, object_type
                     FROM user_objects
                    WHERE object_type IN
                             ('TABLE',
                              'VIEW',
                              'PACKAGE',
                              'PROCEDURE',
                              'FUNCTION',
                              'SEQUENCE',
                              'SYNONYM',
                              'PACKAGE BODY'
                             ))
   LOOP
      BEGIN
         IF cur_rec.object_type = 'TABLE'
         THEN
            EXECUTE IMMEDIATE    'DROP '
                              || cur_rec.object_type
                              || ' "'
                              || cur_rec.object_name
                              || '" CASCADE CONSTRAINTS';
         ELSE
            EXECUTE IMMEDIATE    'DROP '
                              || cur_rec.object_type
                              || ' "'
                              || cur_rec.object_name
                              || '"';
         END IF;
      EXCEPTION
         WHEN OTHERS
         THEN
            DBMS_OUTPUT.put_line (   'FAILED: DROP '
                                  || cur_rec.object_type
                                  || ' "'
                                  || cur_rec.object_name
                                  || '"'
                                 );
      END;
   END LOOP;
END;

/

如何使用SQL删除Oracle数据库中的所有数据？

4 个答案: