游标示例

代码

   
     

    
      
    
      SET
    
       NOCOUNT 
    
      ON
    
      


    
      begin
    
       
    
      tran
    
      


    
      DECLARE
    
       
    
      @newsid
    
       
    
      varchar
    
      (
    
      80
    
      )

    
      DECLARE
    
       
    
      @ishaveAnnex
    
       
    
      varchar
    
      (
    
      100
    
      )


    
      DECLARE
    
       vendor_cursor 
    
      CURSOR
    
       
    
      FOR
    
       

    
      SELECT
    
       
    
      [
    
      newsid
    
      ]
    
       
    
      FROM
    
       
    
      [
    
      News
    
      ]
    
      


    
      OPEN
    
       vendor_cursor 

    
      FETCH
    
       
    
      NEXT
    
       
    
      FROM
    
       vendor_cursor 
    
      INTO
    
       
    
      @newsid
    
      


    
      WHILE
    
       
    
      @@FETCH_STATUS
    
       
    
      =
    
       
    
      0
    
      

    
      BEGIN
    
      


    
      select
    
       
    
      @ishaveAnnex
    
       
    
      =
    
      ishaveAnnex 
    
      from
    
       News 
    
      where
    
       newsid 
    
      =
    
       
    
      @newsid
    
      


    
      if
    
       (
    
      @ishaveAnnex
    
       
    
      =
    
       
    
      '
    
      1
    
      '
    
      )
 
    
      begin
    
      
 
    
      update
    
       News 
    
      set
    
       ishaveAnnex 
    
      =
    
       
    
      '
    
      0
    
      '
    
       
    
      where
    
       newsid 
    
      =
    
       
    
      @newsid
    
      
 
    
      end
    
      

    
      else
    
       
    
      if
    
       (
    
      @ishaveAnnex
    
       
    
      =
    
       
    
      '
    
      0
    
      '
    
      )
 
    
      begin
    
      
 
    
      update
    
       News 
    
      set
    
       ishaveAnnex 
    
      =
    
       
    
      '
    
      1
    
      '
    
       
    
      where
    
       newsid 
    
      =
    
       
    
      @newsid
    
      
 
    
      end
    
      
 
    
      FETCH
    
       
    
      NEXT
    
       
    
      FROM
    
       vendor_cursor 
    
      INTO
    
       
    
      @newsid
    
      
 

    
      END
    
      

    
      CLOSE
    
       vendor_cursor

    
      DEALLOCATE
    
       vendor_cursor

    
      if
    
       
    
      @@error
    
      <>
    
      0
    
      
 
    
      rollback
    
       
    
      tran
    
      

    
      else
    
      
 
    
      commit
    
       
    
      tran