前言
前面已经学习了Spring以及MyBatis的相关知识,那么这一章就说一下Spring与MyBatis的集成。有两种方式。
一、方式一 使用MapperScannerConfigurer
1.1 新建项目并导包
新建一个maven项目,并导入如下jar包。
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.5.0</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
1.2 创建spring配置文件
这里将mybatis的配置也写在了spring中。
通过配置SqlSessionFactoryBean可以得到连接池和mapper映射文件。
配置MapperScannerConfigurer,该bean负责调用sqlsession的getMapper方法,创建符合mapper映射器要求的对象,并将对象添加到spring容器中,所以这个测试项目的配置中未曾配置组件扫描,但是仍然可以将对象添加到容器中。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 获取数据库连接配置 -->
<util:properties id="dbConfig" location="classpath:db.properties"></util:properties>
<!-- 连接池 -->
<bean id="ds" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="#{dbConfig.driver}"></property>
<property name="url" value="#{dbConfig.url}"></property>
<property name="username" value="#{dbConfig.username}"></property>
<property name="password" value="#{dbConfig.password}"></property>
</bean>
<!-- mybatis的配置,包括连接池和映射文件地址 -->
<bean id="ssfb" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="ds"></property>
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
</bean>
<!-- 生成符合映射器的对象 相当于SqlSession.getMapper() -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="dao"></property>
</bean>
</beans>
1.3 实体类
因为dao这种有两个实体类,这里就一并列出,也是因为懒不想改动以前的代码~~这里的基础类都是上一章用到的,感兴趣的可以去看一下上一章MyBatis框架
package entity;
public class Dept {
private String deptno;
private String deptname;
private String num;
public String getDeptno() {
return deptno;
}
public String getDeptname() {
return deptname;
}
public String getNum() {
return num;
}
public void setDeptno(String deptno) {
this.deptno = deptno;
}
public void setDeptname(String deptname) {
this.deptname = deptname;
}
public void setNum(String num) {
this.num = num;
}
@Override
public String toString() {
return "Dept [deptno=" + deptno + ", deptname=" + deptname + ", num=" + num + "]";
}
}
package entity;
public class Dept2 {
private String id;
private String name;
private String num;
public String getId() {
return id;
}
public String getName() {
return name;
}
public String getNum() {
return num;
}
public void setId(String id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setNum(String num) {
this.num = num;
}
@Override
public String toString() {
return "Dept2 [id=" + id + ", name=" + name + ", num=" + num + "]";
}
}
1.4 Dao
也可以成为映射器。这是一个接口文件。
package dao;
import java.util.List;
import java.util.Map;
import entity.Dept;
import entity.Dept2;
public interface DeptDao {
public void insertOne(Dept dept);
public void deleteOne(String id);
public void updateOne(Dept dept);
public List<Dept> findAll();
public Dept findById(String id);
public Dept2 findById2(String id);
public Dept2 findById3(String id);
public Map findById4(String id);
}
1.5 mapper映射文件
<?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="dao.DeptDao">
<insert id="insertOne" parameterType="entity.Dept">
insert into dept(deptno,deptname,num)values(#{deptno},#{deptname},#{num})
</insert>
<delete id="deleteOne" parameterType="String">
delete from dept where deptno=#{deptno}
</delete>
<update id="updateOne" parameterType="entity.Dept">
update dept set deptname=#{deptname},num=#{num} where deptno=#{deptno}
</update>
<select id="findById" resultType="entity.Dept">
select * from dept where deptno=#{deptno}
</select>
<select id="findAll" resultType="entity.Dept">
select * from dept
</select>
<select id="findById2" resultType="entity.Dept2">
select deptno id,deptname name,num from dept where deptno=#{deptno}
</select>
<select id="findById3" resultMap="deptmap">
select * from dept where deptno=#{deptno}
</select>
<resultMap type="entity.Dept2" id="deptmap">
<result property="id" column="deptno" />
<result property="name" column="deptname" />
</resultMap>
<select id="findById4" resultType="map">
select * from dept where deptno=#{deptno}
</select>
</mapper>
1.6 测试
此处测试只测试了一个方法,作为示例,感兴趣的小伙伴可以将其他的方法做一个测试,前面的代码以及有了,就只是增加测试方法。
package test;
import org.junit.Before;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import dao.DeptDao;
public class Test {
private DeptDao dao;
@Before
public void initInfo(){
ApplicationContext ac = new ClassPathXmlApplicationContext("spring.xml");
dao = ac.getBean("deptDao",DeptDao.class);
}
@org.junit.Test
public void test1(){
System.out.println(dao.findAll());
}
}
二、方式二 使用SqlSessionTemplate
这种方式很类似JdbcTemplate,都是将sql封装成模板对象,直接调用相应的方法即可。
2.1 配置文件
配置SqlSessionTemplate和组件扫描,此时不再需要配置上面的MapperScannerConfigurer。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 获取数据库连接配置 -->
<util:properties id="dbConfig" location="classpath:db.properties"></util:properties>
<!-- 连接池 -->
<bean id="ds" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="#{dbConfig.driver}"></property>
<property name="url" value="#{dbConfig.url}"></property>
<property name="username" value="#{dbConfig.username}"></property>
<property name="password" value="#{dbConfig.password}"></property>
</bean>
<!-- mybatis的配置,包括连接池和映射文件地址 -->
<bean id="ssfb" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="ds"></property>
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
</bean>
<!-- 生成符合映射器的对象 相当于SqlSession.getMapper() -->
<!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="dao"></property>
</bean> -->
<!-- 将SqlSessionFactory通过构造器方式注入 -->
<bean id="sst" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="ssfb"></constructor-arg>
</bean>
<!-- 组件扫描 -->
<context:component-scan base-package="dao" />
</beans>
2.2 映射器的实现类
需要编写一个映射器也就是dao的实现类,该类中注入SqlSessionTemplate,方法中调用其中的方法即可,此处以findAll作为示例,其他的方法未写全。
package dao;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.stereotype.Repository;
import entity.Dept;
import entity.Dept2;
@Repository("deptDaoImpl")
public class DeptDaoImpl implements DeptDao {
@Resource(name="sst")
private SqlSessionTemplate sst;
public void insertOne(Dept dept) {
// TODO Auto-generated method stub
}
public void deleteOne(String id) {
// TODO Auto-generated method stub
}
public void updateOne(Dept dept) {
// TODO Auto-generated method stub
}
public List<Dept> findAll() {
List<Dept> list = sst.selectList("dao.DeptDao.findAll", Dept.class);
return list;
}
public Dept findById(String id) {
// TODO Auto-generated method stub
return null;
}
public Dept2 findById2(String id) {
// TODO Auto-generated method stub
return null;
}
public Dept2 findById3(String id) {
// TODO Auto-generated method stub
return null;
}
public Map findById4(String id) {
// TODO Auto-generated method stub
return null;
}
}
2.3 测试
其他的类都是和上面一致的,无需改动。
测试方法有所变化,如下:
package test;
import org.junit.Before;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import dao.DeptDao;
public class Test {
private DeptDao dao;
@Before
public void initInfo(){
ApplicationContext ac = new ClassPathXmlApplicationContext("spring.xml");
dao = ac.getBean("deptDaoImpl",DeptDao.class);
}
@org.junit.Test
public void test1(){
System.out.println(dao.findAll());
}
}
此时获取的bean是deptDaoImpl,也就是实现类的bean。
至此,Spring与MyBatis的集成就说完了,两种方式相比,第一种方式较为常用一点。第二种方式略微复杂一些。
本文介绍两种Spring与MyBatis集成的方式:一是使用MapperScannerConfigurer,二是使用SqlSessionTemplate。详细讲解了每种方式的配置步骤及代码示例。
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