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MyBatis-Spring整合

程序员文章站 2022-03-19 16:22:42
导入相关依赖:mybatismysql数据库Spring相关的AOP置入mybatis-springjunit测试相关的 org.mybatis ...

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&amp;useUnicode=true&amp;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&amp;useUnicode=true&amp;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,sqlSessionFactorysqlSession
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>

MyBatis-Spring整合

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
MyBatis-Spring整合
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:
MyBatis-Spring整合
下图为spring整合mybatis后的目录结构:
MyBatis-Spring整合

整体整合顺序:

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&amp;useUnicode=true&amp;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