MyBatis-Spring整合
导入相关依赖:
- mybatis
- mysql数据库
- Spring相关的
- AOP置入
- mybatis-spring
- junit测试相关的
<!--整合Mybatis-Spring要是用的依赖-->
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<!--mysql连接数据库依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--spring-ioc依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<!--AOP依赖,独立的AOP框架,与spring框架一起使用-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
<!--使用spring操作数据库-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<!--MyBatis-Spring-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<!--测试相关依赖-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
编写Mybatis步骤:
1,编写核心配置文件
2,编写工具类
3,编写实体类
4,编写接口
5,编写Mapper.xml
6,测试
Mybatis相关操作传送门:第一个Mybatis程序
MyBatis-Spring整合
第一步:编写核心配置文件(Mybatis数据库环境配置)
mybatis-config.xml
<configuration>
......
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url"
value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
......
</configuration>
将Mybatis数据库环境配置中的数据源dataSource注入Spring配置文件中,由Spring管理:
applicationContext.xml
<!--注入数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
第二步:编写工具类
MybatisUtils.java
public class MybatisUtils {
private static SqlSessionFactory sqlSessionFactory;
static {
try {
String resources = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resources);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getSqlSession(){
SqlSession sqlSession = sqlSessionFactory.openSession();
return sqlSession;
}
}
MybatisUtils.java这个工具类创建了两个对象,sqlSessionFactory和sqlSession
同样,这两个对象由Spring来接管:
<!--SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--绑定mybatis配置文件地址,可以添加注册映射-->
</bean>
<!--SqlSession-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
从源码中可以看到:从SqlSessionFactoryBean类中可以获得SqlSessionFactory的对象,这个类的属性中有DataSource dataSource属性,就做了数据源的注入
Spring中的SqlSessionTemplate的功能与Mybatis中的SqlSession具有同样的功能,所以要获得SqlSessionTemplate对象要通过传入一个参数SqlSessionFactory的的构造器来获得。
第三步:编写实体类
User.java
public class User {
private int id;
private String name;
private String pwd;
public User() {
}
public User(int id, String name, String pwd) {
this.id = id;
this.name = name;
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
}
第四步:编写接口:
UserMapper.java
public interface UserMapper {
//查询全部用户
public List<User> queryUser();
}
第五步:编写Mapper.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mofei.mapper.UserMapper">
<select id="queryUser" resultType="USer">
select * from mybatis.user
</select>
</mapper>
之后,在Mybatis核心配置文件(mybatis-config.xml)中注册映射以及User类的全类名的别名
<typeAliases>
<typeAlias type="com.mofei.pojo.User" alias="User"/>
</typeAliases>
......
<mappers>
<mapper class="com.mofei.mapper.UserMapper"/>
</mappers>
同样,将注册映射注入到Spring配置文件中,由Spring来接管,留一个别名配置在Mybatis配置文件中,见证Mybatis-Spring整合,当然也可以不要别名,然而Mybatis配置文件就空了,配置内容被Spring全部接管。
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--绑定mybatis配置文件地址,可以添加注册映射(*.xml:将包中的xml文件全部注册映射)-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="classpath:com/mofei/mapper/*.xml"/>
</bean>
此时,除了事务之外,Mybatis核心配置文件中的内容都被Spring接管了,由于SqlSession写入了配置文件,变成了面向对象的,所以Spring还要创建一个实现类,去实现Mapper接口,以后就可以直接通过这个类去调用其中的方法
UserMapperImpl.java
public class UserMapperImpl implements UserMapper{
//之前操作,都使用SqlSession来执行,现在换成SqlSessionTemplate
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> queryUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> users = mapper.queryUser();
return users;
}
}
然后将这个类及属性注入到Spring配置文件中:
<bean id="UserMapperImpl" class="com.mofei.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
进行测试:
public class MyTest {
@Test
public void queryUserTest(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper mapper = context.getBean("UserMapperImpl", UserMapper.class);
List<User> users = mapper.queryUser();
for (User user : users) {
System.out.println(user);
}
}
}
测试结果:
User{id=1, name='叶不羞', pwd='yebuxiu'}
User{id=2, name='提莫', pwd='timo'}
User{id=3, name='黄少天', pwd='huangshaotian'}
User{id=4, name='寒烟柔', pwd='yanrou'}
User{id=5, name='君不笑', pwd='junmoxiao'}
User{id=6, name='荷花', pwd='hehua'}
就是把Mybatis中的核心配置文件都注入到Spring的配置文件中
下图为mybatis的目录结构:
下图为spring整合mybatis后的目录结构:
第一步:整合Mybatis核心配置文件(mybatis-config.xml)及工具类(MybatisUtils.java),其中包括:数据源配置,SqlSessionFactory以及SqlSessionTemplate
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--注入数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
<!--SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--绑定mybatis配置文件地址,可以添加注册映射(*.xml:将包中的xml文件全部注册映射)-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="classpath:com/mofei/mapper/*.xml"/>
</bean>
<!--SqlSession-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
<!--注入接口实现类的对象及属性-->
<bean id="UserMapperImpl" class="com.mofei.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
</beans>
mybatis-config.xml
就剩下别名一个,可以去掉的
<?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>
<typeAlias type="com.mofei.pojo.User" alias="User"/>
</typeAliases>
</configuration>
第二步:编写实体类(User.java)
public class User {
private int id;
private String name;
private String pwd;
......
第三步:编写接口(UserMapper.java)
public interface UserMapper {
//查询全部用户
public List<User> queryUser();
}
第四步:编写Mapper.xml
<mapper namespace="com.mofei.mapper.UserMapper">
<select id="queryUser" resultType="USer">
select * from mybatis.user
</select>
</mapper>
第五步:添加接口实现类
public class UserMapperImpl implements UserMapper{
//之前操作,都使用SqlSession来执行,现在换成SqlSessionTemplate
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> queryUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> users = mapper.queryUser();
return users;
}
}
第五步:测试
public class MyTest {
@Test
public void queryUserTest(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper mapper = context.getBean("UserMapperImpl", UserMapper.class);
List<User> users = mapper.queryUser();
for (User user : users) {
System.out.println(user);
}
}
}
Mybatis-Spring参考文档:mybatis-spring官方文档
资源过滤:
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
本文地址:https://blog.csdn.net/mofeigege/article/details/110223632
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