声明游标
语法结构:
DECLARE cursor_name CURSOR FOR select_statement
描述说明:
游标就是通过该方式声明的。存储过程中可能有多个游标，但同一个代码块中的每个游标必须有唯一标识符。
将SELECT 查询结果关联到类似一个变量的游标中，但是这个查询本身并不是变量，结果也不是动态的。SELECT 语句中不能包含into关键字。
游标必须声明在HANDLERs之前， CONDITIONs和局部变量之后。
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