声明游标

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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。

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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