Oracle 删除当前用户下所有表数据

declare    -- 指向所有 table 的游标    cursor c_t is       select table_name      from user_tables;        table_name user_tables.table_name%type;  begin    open c_t;    loop          fetch c_t into table_name;          exit when c_t%notfound;                  -- 用 delete 而不用 truncate 是为了能户用户回滚,减少误操作         execute immediate 'delete from ' || table_name;    end loop;    close c_t;  end;