FETCH
语法结构:
FETCH cursor_name INTO var_name [, var_name] ...
解释说明：
该语句从指定的游标取下一行值，并向下移动一次光标。
If no more rows are available, a No Data condition occurs with
SQLSTATE value 02000. To detect this condition, you can set up a
handler for it (or for a NOT FOUND condition).
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