oracle存储过程游标循环

CREATE OR REPLACE PROCEDURE sp_sync_plan IS 
  CURSOR C_EMP IS --声明显式游标  
    SELECT * FROM dc_check_todo;  
  C_ROW C_EMP%ROWTYPE; --定义游标变量，该变量的类型为基于游标C_EMP的记录  
BEGIN 
  --For 循环  
  FOR C_ROW IN C_EMP LOOP  
    DBMS_OUTPUT.PUT_LINE(C_ROW.todo_id || '--' );  
  END LOOP;  
 
  --Fetch 循环  
  OPEN C_EMP;--必须要明确的打开和关闭游标  
  LOOP  
    FETCH C_EMP  
      INTO C_ROW;  
    EXIT WHEN C_EMP%NOTFOUND;  
    DBMS_OUTPUT.PUT_LINE(C_ROW.todo_id || '++' );  
  END LOOP;  
  CLOSE C_EMP;  
 
  --While 循环  
  OPEN C_EMP;--必须要明确的打开和关闭游标  
    FETCH C_EMP INTO C_ROW;  
    WHILE C_EMP%FOUND LOOP  
      DBMS_OUTPUT.PUT_LINE(C_ROW.todo_id || '**' );  
      FETCH C_EMP INTO C_ROW;  
    END LOOP;  
  CLOSE C_EMP;  
END sp_sync_plan;