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Mybatis实现增删改查及分页查询的方法

2016-01-18 11:03 609 查看

MyBatis的前身就是iBatis。是一个数据持久层(ORM)框架。 MyBatis是支持普通SQL查询,存储过程和高级映射的优秀持 久层框架。MyBatis消除了几乎所有的JDBC 代码和参数的手工 设置以及结果集的检索。MyBatis使用简单的XML或注解用于 配置和原始映射,将接口和Java 的POJOs(Plan Old Java Objects,普通的Java 对象)映射成数据库中的记录。每个 MyBatis应用程序主要都是使用SqlSessionFactory实例的,一个 SqlSessionFactory实例可以通过SqlSessionFactoryBuilder获得。

具体代码如下所示:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<!-- give a alias for model -->
<typeAlias alias="goods" type="com.clark.model.Goods"></typeAlias>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@172.30.0.125:1521:oradb01" />
<property name="username" value="settlement" />
<property name="password" value="settlement" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/clark/model/goodsMapper.xml" />
</mappers>
</configuration>
<?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="clark">
<!-- 将db查询出来的结果映射到Model--Goods -->
<resultMap type="com.clark.model.Goods" id="t_good">
<id column="id" property="id"/>
<result column="cate_id" property="cateId"/>
<result column="name" property="name"/>
<result column="price" property="price"/>
<result column="description" property="description"/>
<result column="order_no" property="orderNo"/>
<result column="update_time" property="updateTime"/>
</resultMap>
<!-- 根据id查询 返回Goods类型 <typeAlias alias="goods" type="com.clark.model.Goods"></typeAlias>-->
<!--resultMap 和 resultType的使用区别-->
<select id="selectGoodById" parameterType="int" resultType="goods">
select id,cate_id,name,price,description,order_no,update_time
from goods where id = #{id}
</select>
<!-- 查询所有Goods 返回resultMap类型-->
<select id="selectAllGoods" resultMap="t_good">
select id,cate_id,name,price,description,order_no,update_time from goods
</select>
<!-- 指定parameterType=map 其中map的形式为Map<String,PageBean> map-->
<select id="selectGoodsByPage" resultMap="t_good" parameterType="map">
<!-- order by id asc是指对查询后的结果进行升序排序 -->
<![CDATA[
select * from
(select g.*,rownum rn from (select * from goods) g where 1=1 and rownum <= #{pageBean.endNumber})
where rn >= #{pageBean.startNumber}
order by id asc
]]>
</select>
<!-- 新增Goods 参数类型为Goods-->
<insert id="insertGood" parameterType="goods">
insert into goods(id,cate_id,name,price,description,order_no,update_time)
values(#{id},#{cateId},#{name},#{price},#{description},#{orderNo},#{updateTime})
</insert>
<!-- 更新Goods 参数类型为Goods-->
<update id="updateGood" parameterType="goods">
update goods g
set g.name = #{name},g.order_no =#{orderNo}
where g.id = #{id}
</update>
<!-- 删除Goods 参数类型为int-->
<delete id="deleteGood" parameterType="int">
delete from goods g
where g.id = #{id}
</delete>
</mapper>
package com.clark.model;
import java.util.Date;
public class Goods {
private Integer id;
private Integer cateId;
private String name;
private double price;
private String description;
private Integer orderNo;
private Date updateTime;
public Goods(){
}
public Goods(Integer id, Integer cateId, String name, double price,
String description, Integer orderNo, Date updateTime) {
super();
this.id = id;
this.cateId = cateId;
this.name = name;
this.price = price;
this.description = description;
this.orderNo = orderNo;
this.updateTime = updateTime;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getCateId() {
return cateId;
}
public void setCateId(Integer cateId) {
this.cateId = cateId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getOrderNo() {
return orderNo;
}
public void setOrderNo(Integer orderNo) {
this.orderNo = orderNo;
}
public Date getTimeStamp() {
return updateTime;
}
public void setTimeStamp(Date updateTime) {
this.updateTime = updateTime;
}
@Override
public String toString() {
return "[goods include:Id="+this.getId()+",name="+this.getName()+
",orderNo="+this.getOrderNo()+",cateId="+this.getCateId()+
",updateTime="+this.getTimeStamp()+"]";
}
}
package com.clark.model;
//模拟的一个分页对象PageBean
public class PageBean {
//开始数
private Integer startNumber;
//结束数
private Integer endNumber;
public PageBean(){
}
public PageBean(Integer startNumber, Integer endNumber) {
super();
this.startNumber = startNumber;
this.endNumber = endNumber;
}
public Integer getStartNumber() {
return startNumber;
}
public void setStartNumber(Integer startNumber) {
this.startNumber = startNumber;
}
public Integer getEndNumber() {
return endNumber;
}
public void setEndNumber(Integer endNumber) {
this.endNumber = endNumber;
}
}
package com.clark.mybatis;
import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import com.clark.model.Goods;
import com.clark.model.PageBean;
public class TestGoods {
public static void main(String[] args) throws IOException {
String resource = "configuration.xml";
Reader reader = null;
SqlSessionFactory sessionFactory = null;
SqlSession session = null;
try {
reader = Resources.getResourceAsReader(resource);
sessionFactory = new SqlSessionFactoryBuilder().build(reader);
session = sessionFactory.openSession();
PageBean pageBean = new PageBean(8, 20);
Map<String,PageBean> map = new HashMap<String, PageBean>();
map.put("pageBean", pageBean);
List<Goods> gs = findGoodsByPage(session,map);
for (Goods goods2 : gs) {
System.out.println(goods2.toString());
}
} catch (IOException e) {
e.printStackTrace();
}finally{
session.close();
reader.close();
}
}
//find by id
public static Goods findGoodById(SqlSession session,Integer id){
//clark对应着goodMapper.xml配置文件中的namespace name="clark"
Goods goods = (Goods)session.selectOne("clark.selectGoodById", id);
return goods;
}
//find all
public static List<Goods> findAllGoods(SqlSession session){
List<Goods> goods = session.selectList("clark.selectAllGoods");
return goods;
}
public static List<Goods> findGoodsByPage(SqlSession session,Map<String,PageBean> map){
List<Goods> goods = session.selectList("clark.selectGoodsByPage",map);
return goods;
}
//insert a goods
public static int insertGoods(SqlSession session,Goods goods){
int result = session.insert("clark.insertGood", goods);
session.commit();
return result;
}
//update goods
public static int updateGoods(SqlSession session,Goods goods){
int result = session.update("clark.updateGood", goods);
session.commit();
return result;
}
//delete goods
public static int deleteGood(SqlSession session,Integer id){
int result = session.delete("clark.deleteGood", id);
session.commit();
return result;
}
}

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