Spring整合Mybatis（xml方式）

其他 2020-07-26 21:21:46 阅读次数: 0

Spring整合Mybatis

目录

导入依赖

  • Spring所需依赖：spring-context、spring-aspects、aspectjrt、aspectjweaver、spring-tx、spring-jdbc
  • mybatis所需要：mybatis、mybatis-spring、mysql-connector-java、(druid、c3p0、HikariCP)
  • 辅助性依赖：logback-classic、lombok、spring-test、junit、mapper(可选)、pagehelper(可选)

配置文件

  • 核心配置文件：数据库连接信息
  • 辅助性配置文件：日志配置
  • 可选配置文件：基于xml整合和半注解整合时需要的spring核心配置

整合思路

mybatis的任务

  • 构建SqlSessionFactory对象
    • 数据库的连接信息，最终以连接池的形式提供给SqlSessionFactory
  • 构建SqlSession对象
    • 通过SqlSessionFactory来获取
  • 必要的配置信息
    • 全局配置(类的别名、缓存等等)
    • 插件配置
    • 加载映射配置文件

Spring的任务

  • 管理各层的JavaBean对象
  • 管理事务

xml方式配置

环境配置

数据库连接属性

db.properties文件放置数据库连接属性

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/ssm?serverTimezone=GMT%2B8
jdbc.username=root
jdbc.password=root

bean对象

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private int age;
}

持久层

public interface UserMapper {
    public List<User> getAll();
}

xml文件

<mapper namespace="com.hello.mapper.UserMapper">

    <select id="getAll" resultType="user">
        select * from user
    </select>

</mapper>

服务层接口

public interface IUserServiceV1 {
    public List<User> getAll();
}

不使用mybatis：scan

服务层实现类

public class UserServiceV1 implements IUserServiceV1{

    private SqlSessionTemplate sqlSession;
    private UserMapper mapper;

    public UserServiceV1(SqlSessionTemplate sqlSession){
        this.sqlSession=sqlSession;
        mapper=sqlSession.getMapper(UserMapper.class);
    }

    @Override
    public List<User> getAll() {
        return mapper.getAll();
    }
}

spring配置文件

<?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">

    <!--导入数据库配置信息文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--数据库连接池配置-->
    <bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource">
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
    </bean>
    <!--sqlSessionFactory配置-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath*:com/hello/mapper/**/*.xml"/>
        <property name="typeAliasesPackage" value="com/hello/bean"/>
    </bean>
    <!--配置sqlSession对象-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    <!--配置service-->
    <bean id="userService" class="com.hello.v1.service.impl.UserServiceV1">
        <constructor-arg ref="sqlSession"/>
    </bean>
</beans>

测试代码：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationV1.xml")
public class AppTestV1 {
    @Autowired
    public IUserServiceV1 serviceV1;
    @Test
    public void getALL(){
        List<User> all = serviceV1.getAll();
        for (User user:all) {
            System.out.println(user);
        }
    }
}

使用mybatis：scan

服务层实现类：

public class UserServiceV2 implements IUserServiceV2 {

    private UserMapper mapper;

    public void setMapper(UserMapper mapper){
        this.mapper=mapper;
    }

    public UserMapper getMapper(){
        return this.mapper;
    }

    @Override
    public List<User> getAll() {
        return mapper.getAll();
    }
}

spring配置文件：

<?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"
       xmlns:mybatis="http://mybatis.org/schema/mybatis-spring"
       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 http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd">

    <!--关联jdbc连接属性文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--配置dataSource-->
    <bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource">
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
    </bean>
    <!--配置sqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="dataSource" ref="dataSource"/>
        <property name="typeAliasesPackage" value="com/hello/bean"/>
        <property name="mapperLocations" value="classpath*:com/hello/mapper/**/*.xml"/>
    </bean>
    <!--配置service-->
    <bean id="userService" class="com.hello.v2.service.impl.UserServiceV2" autowire="byType"/>
    <!--通过mybatis扫描，将mapper接口和xml文件生成mapper类，放入spring容器，不用从sqlSession中getMapper-->
    <mybatis:scan base-package="com.hello.mapper"/>

</beans>

依赖

<!--自定义属性列表-->
 <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>   
	<junit.version>4.12</junit.version>
    <spring.version>5.2.6.RELEASE</spring.version>
    <aspectjrt.version>1.6.11</aspectjrt.version>
    <aspectjweaver.version>1.6.11</aspectjweaver.version>
    <lombok.version>1.18.8</lombok.version>
    <logback.classic.version>1.2.3</logback.classic.version>
    <mybatis.version>3.4.6</mybatis.version>
    <mybatis.spring.version>1.3.2</mybatis.spring.version>
    <mysql.version>5.1.47</mysql.version>
    <HikariCP.version>3.3.1</HikariCP.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${spring.version}</version>
        <exclusions>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>${mysql.version}</version>
</dependency>
<dependency>
    <groupId>com.zaxxer</groupId>
    <artifactId>HikariCP</artifactId>
    <version>${HikariCP.version}</version>
</dependency>

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>${mybatis.version}</version>
</dependency>

<!-- spring整合mybatis包 -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>${mybatis.spring.version}</version>
</dependency>

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>${junit.version}</version>
    <scope>test</scope>
</dependency>
<!--Spring基础依赖-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
    <version>${spring.version}</version>
</dependency>
<!--使用AspectJ方式注解需要相应的包 -->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjrt</artifactId>
    <version>${aspectjrt.version}</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>${aspectjweaver.version}</version>
</dependency>

<!-- 整合Junit -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>${spring.version}</version>
    <scope>test</scope>
</dependency>

<!--省略get和set方法-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>${lombok.version}</version>
</dependency>
<!--日志依赖-->
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>${logback.classic.version}</version>
</dependency>
</dependencies>

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