整合过程
1.1 导包
（1）Spring包
（2）mybatis包
（3）导入整合包
1.2搭建环境
创建applicationContext.xml，sqlMapConfig.xml,db.properties,log4j.properties等文件
1.3开始整合mybatis
不管哪种整合都依赖于sessionFactory对象，sessionFactory需要依赖于读取mybatis核心配置文件中的信息。
分为三层：
一、别名的设置
二、数据库的链接信息
三、读取映射文件
其中的第二层可以使用连接池来取代，实际上sqlSession需要依赖两个一个是DataSource还有就是核心配置文件
(一) 原始整合
|
public class User {
private Integer id;
private String name;
private String sex;
private String address;
private Integer balance;
public User() {
}
public User(Integer id, String name, String sex, String address, Integer balance) {
this.id = id;
this.name = name;
this.sex = sex;
this.address = address;
this.balance = balance;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Integer getBalance() {
return balance;
}
public void setBalance(Integer balance) {
this.balance = balance;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
", balance=" + balance +
'}';
}
}
|
创建dao层接口，并实现类
|
public interface UserDao {
User findUserById(Integer id);
}
|
|
public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {
@Override
public User findUserById(Integer id) {
User user = getSqlSession().selectOne("test.findUserById", 1);
return user;
}
}
|
配置applicationContext.xml文件和数据库连接文件db.properties以及userMapper.xml文件
|
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="password" value="${jdbc.password}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="driverClass" value="${jdbc.driver}"></property>
</bean>
<bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:resources/mybatis/sqlMapConfig.xml"></property>
</bean>
<bean name="userDao" class="cd.hd.dao.impl.UserDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>
<bean name="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
<property name="mapperInterface" value="cd.hd.mapper.UserMapper"></property>
</bean>
|
|
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=1234
|
|
<?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="cd.hd.mapper.UserMapper">-->
<mapper namespace="test">
<select id="findUserById" parameterType="int" resultType="user">
SELECT * FROM mbs WHERE id=#{id}
</select>
</mapper>
|
最后书写测试代码
|
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:resources/spring/applicationContext.xml")
public class Demo {
@Resource(name = "userDao")
private UserDao userDao;
@Test
public void fun(){
User userById = userDao.findUserById(1);
System.out.println(userById);
}
|
测试结果
（二）mapper整合
需要一个bean类--》mapperFactoryBean类（需要取名字）
该类依赖于两个（sqlSessionFactory和接口的位置）
直接进行测试
这种方式需要写很多的mapper,mybatis提供了升级版
配置一个扫描类，自动扫描某个位置下的mapper，并起名为对应的小写
|
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="cd.hd.mapper"></property>
</bean>
|
userMapper.xml文件配置一下
|
<?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="cd.hd.mapper.UserMapper">
<!--<mapper namespace="test">-->
<select id="findUserById" parameterType="int" resultType="user">
SELECT * FROM mbs WHERE id=#{id}
</select>
</mapper>
|
Namespace的属性值设为userMapper接口的相对路径
测试代码直接使用注解
|
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:resources/spring/applicationContext.xml")
public class Demo {
@Resource(name = "userMapper")
private UserMapper userMapper;
@Test
public void fun1(){
User userById = userMapper.findUserById(1);
System.out.println(userById);
}
}
|
测试结果
