update方法的第三个和第四个参数学习的时候书上讲的意思看不懂，查资料也没有特别说明，希望能详细的解释一下。
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These two parameters identify the updated record. You can think of this record as being updated only when this condition is established.
If you want to modify the grades of a student named zhangsan, you can write update('score',values,'name=?','zhangsan');
update('score',values,'name=?','zhangsan');
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These two parameters identify the updated record. You can think of this record as being updated only when this condition is established.
If you want to modify the grades of a student named zhangsan, you can write
update('score',values,'name=?','zhangsan');