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  • SQL游标 数据库编程样例

    --处理file与folder中的order
    
    -- 声明变量
    DECLARE
        @fileid AS INT,
        @folderid AS INT,
        @order AS INT,
        @oldFolderId AS INT,
        @orderCursor AS INT;
    -- 声明游标
    DECLARE C_FILE CURSOR FAST_FORWARD FOR
        SELECT Id,FolderID,[ORDER] 
        FROM FILES where [ORDER]=0
        ORDER BY FolderId,Name;
    OPEN C_FILE;
    
    -- 取第一条记录
    FETCH NEXT FROM C_FILE INTO @fileid,@folderid,@order;
    set @oldFolderId = @folderid
    set @orderCursor = 0
    WHILE @@FETCH_STATUS=0
    BEGIN
        
    	if(@oldFolderId != @folderid)
        begin
    		set @orderCursor = 0;
    		set @oldFolderId = @folderid;
        end
        set @orderCursor = @orderCursor + 1;
        
    	UPDATE FILES SET [Order]= @orderCursor WHERE Id=@fileid;
        
        -- 取下一条记录
        FETCH NEXT FROM C_FILE INTO @fileid,@folderid,@order;
    END
    
    -- 关闭游标
    CLOSE C_FILE;
    
    -- 释放游标
    DEALLOCATE C_FILE;
    
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  • 原文地址:https://www.cnblogs.com/wswind/p/9876237.html
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