+"',password='"+password+"',email='"+email
+"',grade="+grade+" where userId="+userId
这几处是字符串需要加单引号
这样用"UPDATE table1 SET address = 'King's Road“,” WS' WHERE name = ‘James’;
在，两侧加双引号“”
UPDATE table1 SET address =“King's Road, WS” WHERE name = James
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