mybatis配置SQL语句的方式

yui

配置MAPPER的方式有四种，不过现在只用了两种。
一种是通过XML方式配置，另一种是通过接口+注解
先看第一种：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lonton.mybatis.filemapper">
<select id="findPage" parameterType="map" resultType="fileinfo">
select * from file_info  limit #{begin},#{size}
</select>
<select id="findPageOrder" parameterType="map" resultType="fileinfo">
select * from file_info  order by #{column} #{order} limit #{begin},#{size}
</select>
<select id="findAll" resultType="fileinfo">
select * from file_info
</select>
<select id="search" parameterType="String" resultType="fileinfo">
select * from file_info  where name like #{name}
</select>
<select id="selectCount" resultType="int">
select count(*)  from file_info
</select>
</mapper>

通过接口+注解：
package com.lonton.testMyBatis.dao;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import com.lonton.testMyBatis.pojo.Fileinfo;
public interface FileinfoDao {
@Select("select * from file_info")
public List<Fileinfo> findAll();
@Select("select * from file_info limit #{begin},#{size}")
public List<Fileinfo> findPage(@Param("map")int page,int pageSize);//注解参数的意思是传给MyBatis API的参数

public List<Fileinfo> findPageOrder(int page,int pageSize,String column,String order);
@Select("select count(*) from file_info")
public int getCount();
@Select("select * from file_info where name like #{name}")
public List<Fileinfo> search(@Param("name") String name);
}

最后的实现类是这样的：
package com.lonton.testMyBatis.daoImpl;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.lonton.testMyBatis.dao.BaseDao;
import com.lonton.testMyBatis.dao.FileinfoDao;
import com.lonton.testMyBatis.pojo.Fileinfo;
public class FileinfoDaoImpl extends BaseDao implements FileinfoDao{
@Override
public List<Fileinfo> findAll() {
return sessionFactory.openSession().selectList("com.lonton.mybatis.filemapper.findAll");
}
@Override
public List<Fileinfo> findPage(int page, int pageSize) {
Map<String,Integer> map = new HashMap<String,Integer>();
map.put("begin", (page-1)*pageSize);
map.put("size", pageSize);
//XML
//return sessionFactory.openSession().selectList("com.lonton.mybatis.filemapper.findPage", map);
//interface
return sessionFactory.openSession().selectList("com.lonton.testMyBatis.dao.FileinfoDao.findPage",map);
}
@Override
public int getCount() {
/*
*  XML MAPPER
*  路径是 namespace+id
*/
//return sessionFactory.openSession().selectOne("com.lonton.mybatis.filemapper.selectCount");
/*
* interface MAPPER
* 路径应该是：包名+类名+方法
*/
return sessionFactory.openSession().selectOne("com.lonton.testMyBatis.dao.FileinfoDao.getCount");
}
@Override
public List<Fileinfo> search(String name) {
return sessionFactory.openSession().selectList("com.lonton.mybatis.filemapper.search", "%"+name+"%");
}
@Override
public List<Fileinfo> findPageOrder(int page, int pageSize, String column,
String order) {
Map<String,Object> map = new HashMap<String,Object>();
map.put("begin", (page-1)*pageSize);
map.put("size", pageSize);
map.put("column", column);
map.put("order", order);
return sessionFactory.openSession().selectList("com.lonton.mybatis.filemapper.findPageOrder", map);
}
}