DButils使用示例:
1-3. 查询
4-5. 插入
6 . 删除
7 . 修改
1:查询单个记录,返回实体Bean
User user = qr.query(conn,
"select * from user where username='admin'",
new BeanHandler<User>(User.class));
2:查找单个记录,返回Map集合
Map<String, Object> map = qr.query(conn, "SELECT * FROM user where username=?", new MapHandler(),"admin");
3:查找所有记录,返回List集合
List<User> list = (List) qr.query(conn, "SELECT * FROM user", new BeanListHandler(User.class));
4:插入一条数据
qr.update(conn, "insert into user (username,password) values (?,?)","admin3", "1234");
5:插入多条数据
qr.batch(conn, "insert into user (username,password) values (?,?)",new Object[][] {
{"admin4", "1234"},
{"admin5", "1234"}
});
6:删除
//删除单条记录(SQL语句中带好条件)
qr.update(conn, "delete from user where username='admin2'");
//删除单条记录(SQL语句中条件预处理)
qr.update(conn, "delete from user where username=?", "admin3");
//删除多条记录
qr.batch(conn, "delete from user where username=?",
new Object[][] { { "admin5" }, { "admin4" } });
7:修改一条记录
qr.update(conn,"update user set password = ? where username=?", "set修改的内容", "where条件");