Mybatis入门（三）Spring整合Mybatis – xml文件

文章目录

前言

Mybatis-Spring整合：http://mybatis.org/spring/zh/index.html

一、导入依赖

pom.xml

<dependencies>
        <!-- Spring核心 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.9</version>
        </dependency>

        <!--MySQL-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>

        <!--MyBatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>

        <!--Spring整合MyBatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>

        <!--Spring整合JDBC-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.9</version>
        </dependency>

        <!-- druid阿里的数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.20</version>
        </dependency>

        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

二、编写User实体类

User

@Data
@Accessors(chain = true)
public class User implements Serializable {
    private Integer id;
    private String name;
    private Integer age;
    private String sex;
}

三、编写持久层UserMapper接口

UserMapper

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

四、编写UserMapper映射文件

UserMapper.xml

<?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="cn.cy.mapper.UserMapper">
    <select id="getAllUser" resultType="cn.cy.pojo.User">
        select * from demo_user
    </select>
</mapper>

五、编写jdbc.properties配置文件

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/demo_admin?useSSL=false&useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root

六、编写springContext.xml配置文件

springContext.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"
       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">

    <!-- 加载数据库连接信息的属性文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!-- 配置Druid数据源的Bean -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="initialSize" value="5"/>
        <property name="maxActive" value="5"/>
    </bean>

    <!-- 配置SessionFactory的Bean -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 指定MyBatis配置文件的位置 -->
        <property name="mapperLocations" value="classpath:mappers/*.xml"/>
        <!-- 给实体类起别名 -->
        <property name="typeAliasesPackage" value="cn.cy.pojo"/>
    </bean>

    <!-- 配置mapper接口的扫描器，将Mapper接口的实现类自动注入到IoC容器中
     实现类Bean的名称默认为接口类名的首字母小写 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <!-- basePackage属性指定自动扫描mapper接口所在的包 -->
        <property name="basePackage" value="cn.cy.mapper"/>
    </bean>
</beans>

七、编写UserMapperTests测试类

UserMapperTests

public class UserMapperTests {

    private ApplicationContext ac;

    @Before
    public void init() {
        ac = new ClassPathXmlApplicationContext("springContext.xml");
    }

    @Test
    public void getAllUser() {
        UserMapper mapper = ac.getBean(UserMapper.class);
        List<User> users = mapper.getAllUser();
        // [User(id=1, name=zs, age=18, sex=男), User(id=2, name=ls, age=20, sex=男), User(id=3, name=xiaohong, age=18, sex=女)]
        System.out.println(users);
    }
}