1.     分页查询

2.     map传参数

3.     排序

UserMapper.xml

<?xml version="1.0" encoding= "UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><!-- <mapper namespace="model.User"> -->
<mapper namespace="model.User" ><insert id="add" parameterType="model.User" >insert into t_user (username,password,nickname,type)value (#{username},#{password},#{nickname},#{type})</insert ><update id="update" parameterType="model.User" >update t_user set password=#{password},nickname=#{nickname},type=#{type} where id=#{id}</update >  <delete id="delete" parameterType="int" >delete from t_user where id = #{id}</delete ><select id="load" parameterType="int" resultType="model.User" >select * from t_user where id = #{id}</select ><select id="loadByUsername" parameterType="String" resultType= "model.User">select * from t_user where username = #{username}</select >//分页查询<select id="find" resultType="model.User" parameterType="map" >select * from t_user where( username like #{name} or password like #{name})order by ${sort} ${order} limit #{pageOffset},#{pageSize}</select ><select id="find_count" parameterType="map" resultType="int" >select count(*) from t_user where( username like #{name} or password like #{name})</select >
</mapper>

SystemContext

package model;
public class SystemContext
{private static ThreadLocal<Integer> pageSize = new ThreadLocal<Integer>();private static ThreadLocal<Integer> pageIndex = new ThreadLocal<Integer>();private static ThreadLocal<Integer> pageOffset = new ThreadLocal<Integer>();private static ThreadLocal<String> order = new ThreadLocal<String>();private static ThreadLocal<String> sort = new ThreadLocal<String>();public static String getOrder() {return order .get();}public static void setOrder(String _order) {order.set(_order );}public static void removeOrder(){order.remove();}public static String getSort() {return sort .get();}public static void setSort(String _sort) {sort.set(_sort );}public static void removeSort(){sort.remove();}public static int getPageSize() {return pageSize .get();}public static void setPageSize(int _pageSize) {pageSize.set(_pageSize );;}public static int getPageIndex() {return pageIndex .get();}public static void setPageIndex(int _pageIndex) {pageIndex.set(_pageIndex );}public static int getPageOffset() {return pageOffset .get();}public static void setPageOffset(int _pageOffset) {pageOffset.set(_pageOffset );}}

IUserDao

package dao;
import model.Pager;
import model.User;
public interface IUserDao
{public void add(User user );public void update(User user );public void delete(int id);public User loadByUsername(String userName);public User load( int id );public User login(User user);public Pager<User> find(String userName);
}
UserDao
package dao;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import model.Pager;
import model.ShopException;
import model.SystemContext;
import model.User;
import org.apache.ibatis.session.SqlSession;
import util.MyBatisUtil;
public class UserDao implements IUserDao
{@Overridepublic void add(User user ) {User tu = this.loadByUsername(user .getUsername());if(tu != null)throw new ShopException("要添加的用户已经存在!" );SqlSession session = null ;session = MyBatisUtil.createSession();try{session.insert(User.class.getName()+".add", user);session.commit();}catch(Exception e ){e.printStackTrace();session.rollback();}finally{MyBatisUtil. closeSession(session);}}@Overridepublic void update(User user ) {SqlSession session = null ;session = MyBatisUtil.createSession();try{session.update(User.class.getName()+".update", user);session.commit();}catch(Exception e ){e.printStackTrace();session.rollback();}finally{MyBatisUtil. closeSession(session);}}@Overridepublic void delete(int id) {SqlSession session = null ;session = MyBatisUtil.createSession();try{session.delete(User.class.getName()+".delete", id);session.commit();}catch(Exception e ){e.printStackTrace();session.rollback();}finally{MyBatisUtil. closeSession(session);}}@Overridepublic User loadByUsername(String userName) {SqlSession session = null ;User u = null;session = MyBatisUtil.createSession();try{u = session.selectOne(User.class.getName()+".loadByUsername", userName);}catch(Exception e ){e.printStackTrace();session.rollback();}finally{MyBatisUtil. closeSession(session);}return u ;}@Overridepublic User load( int id ) {SqlSession session = null ;User u = null;session = MyBatisUtil.createSession();u = session.selectOne(User.class.getName()+".load", id);MyBatisUtil. closeSession(session);return u ;}@Overridepublic User login(User user) {User u = this.loadByUsername(user .getUsername());if(u == null)throw new ShopException("用户名不存在");if(!u .getPassword().equals(user.getPassword())){throw new ShopException("密码不正确");}return u ;}public Pager<User> find(String name){int pageSize = SystemContext.getPageSize();int pageOffset = SystemContext.getPageOffset();String order = SystemContext.getOrder();String sort = SystemContext.getSort();Pager<User> pages = new Pager<User>();SqlSession session = null ;try{session = MyBatisUtil.createSession();Map<String,Object> params = new HashMap<String,Object>();params.put("name" , "%" +name +"%" );params.put("pageSize" , pageSize );params.put("pageOffset" , pageOffset );params.put("order" , order );params.put("sort" , sort );List<User> datas = session.selectList(User.class.getName()+".find", params);pages.setDatas(datas );pages.setPageOffset(pageOffset );pages.setPageSize(pageSize );int totalRecord = session.selectOne(User.class.getName()+".find_count", params);pages.setTotalRecord(totalRecord );}finally{MyBatisUtil. closeSession(session);}return pages ;}
}

TestUserDao

package test;
import model.Pager;
import model.SystemContext;
import model.User;
import org.junit.Before;
import org.junit.Test;
import dao.DaoFactory;
import dao.IUserDao;
public class TestUserDao
{private IUserDao ud;@Beforepublic void init(){ud = DaoFactory. getUserDao();}/*** 添加用户*/@Testpublic void testAdd(){User user = new User();user.setUsername("呵呵 " );user.setPassword("123" );user.setNickname("张三" );user.setType("123" );ud.add( user);}/*** 更新用户*/@Testpublic void testUpate(){User u = ud.loadByUsername( "呵呵");u.setPassword( "1111");ud.update( u);}/*** 删除用户*/@Testpublic void testDelete(){ud.delete(4);}/*** 登陆验证*/@Testpublic void testLogin(){User user = new User();user.setUsername("2" );user.setPassword("2" );User u = ud.login( user);System. out.println(u .getNickname());}/*** 分页*/@Testpublic void testFind(){SystemContext. setPageOffset(0);SystemContext. setPageSize(15);SystemContext. setOrder("desc");SystemContext. setSort("id");Pager<User> ps = ud.find( "张");System. out.println(ps .getTotalRecord());for(User u :ps .getDatas()){System. out.println(u );}}
}

源码：

http://pan.baidu.com/s/1hqkoY6S