Oracle游标使用参考语句实例解析

Declare 
  -- 声明游标  
  Cursor Mycur Is 
    Select  From Emp; 
  Empinfo Emp%Rowtype; 
  Cou   Number; 
Begin 
  -- 游标操作使用循环，在操作之前必须先将游标打开  
  For Empinfo In Mycur Loop 
    Cou := Mycur%Rowcount; 
    Dbms_Output.Put_Line('行号' || Cou || '  雇员编号' || Empinfo.Empno || '  雇员姓名' || Empinfo.Ename); 
  End Loop; 
End; 

Declare 
  -- 声明游标  
  Cursor Mycur Is 
    Select  From Emp; -- List (EmpPo)  
  Empinfo Emp%Rowtype; 
  Cou   Number; 
Begin 
  -- 游标操作使用循环，在操作之前必须先将游标打开  
  If Mycur%Isopen Then 
    Null; 
  Else 
    Open Mycur; 
  End If; 
  -- 使游标向下一行  
  Fetch Mycur 
    Into Empinfo; 
  -- 判断此行是否有数据被发现  
  While (Mycur%Found) Loop 
    Cou := Mycur%Rowcount; 
    Dbms_Output.Put_Line('行号' || Cou || '  雇员编号' || Empinfo.Empno || '  雇员姓名' || Empinfo.Ename); 
    -- 修改游标，继续向下  
    Fetch Mycur 
      Into Empinfo; 
  End Loop; 
End; 

Declare 
  -- 声明游标 
  Cursor Mycur Is 
    Select  From Emp; 
  Empinfo Emp%Rowtype; 
  Cou   Number; 
Begin 
  -- 游标操作使用循环，在操作之前必须先将游标打开  
  If Mycur%Isopen Then 
    Null; 
  Else 
    Open Mycur; 
  End If; 
  Loop 
    -- 使游标向下一行  
    Fetch Mycur 
      Into Empinfo; 
    Exit When Mycur%Notfound; 
    Cou := Mycur%Rowcount; 
    Dbms_Output.Put_Line('行号' || Cou || '  雇员编号' || Empinfo.Empno || '  雇员姓名' || Empinfo.Ename); 
  End Loop; 
End; 

Create Or Replace Procedure Myproc(Oi_Return Out Integer) Is 
  Cursor Mycur Is 
    Select  From Emp_0915; 
  Empinfo Emp_0915%Rowtype; 
  Cou   Number; 
  Exc_Return Exception; -- 程序中间返回自定义异常 
Begin 
  If Mycur%Isopen Then 
    Null; 
  Else 
    Open Mycur; 
  End If; 
  Loop 
    Fetch Mycur 
      Into Empinfo; 
    Exit When Mycur%Notfound; 
    Cou := Mycur%Rowcount; 
    Dbms_Output.Put_Line(Cou || '开始更新...'); 
    Update Emp_0915 t Set t.Sal = t.Sal + 1 Where t.Empno = Empinfo.Empno; 
    Dbms_Output.Put_Line(Cou || '更新结束...'); 
  End Loop; 
  Commit; 
  Oi_Return := 1; 
Exception 
  When Exc_Return Then 
    Rollback; 
    Oi_Return := 0; 
End; 

Declare 
  Re Integer; 
Begin 
  Myproc(Re); 
  If Re = 1 Then 
    Dbms_Output.Put_Line(Re || '执行结束。。。'); 
  Else 
    Dbms_Output.Put_Line(Re || '执行错误_______'); 
  End If; 
End;