生成db_user数据库的3条测试数据的sql，字段有uid,name,age,sex sex是枚举类型，男和女

INSERT INTO db_user (uid, name, age, sex) VALUES (1, '张三', 25, '男'); INSERT INTO db_user (uid, name, age, sex) VALUES (2, '李四', 30, '男'); INSERT INTO db_user (uid, name, age, sex) VALUES (3, '王五', 28, '女');