【Spring】Spring整合Mybatis案例

第一步：创建maven工程

在idea中点击File->New->Project ,选择maven工程

第二步：添加依赖包

找到工程中的pom.xml文件，在文pom.xml文件的dependencies节点下添加如下依赖包

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

添加完依赖包以后点击maven同步按钮

第三步：创建数据库和实体类

创建数据库

在数据库中创建一个名字为user的，给该表增加3个字段分别是id、name、age

创建实体类和Mapper类

目录结构如下：

实体类MyUser

public class MyUser {
    private int id;
    private String name;
    private int age;

    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "MyUser{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

UserMapper类

@Repository("userDao")
@Mapper
public interface UserMapper {
    MyUser slelectUserById(int id);

    List<MyUser> slelectAll();

    void insertUser(MyUser myUser);

    void updateUser(MyUser user);

    void deleteUser(int userId);
}

第四步：添加Mybatis配置文件

mybatis-config.xml

<?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>

    <mappers>
        <mapper resource="UserMapper.xml"/>
    </mappers>

</configuration>

UserMapper.xml

创建UserMapper.xml映射文件

<?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="com.lucas.mybatis.mapper.UserMapper">
    <select id="slelectUserById" parameterType="Integer"
            resultType="com.lucas.mybatis.model.User">
    select  * from user where id = #{id}
    </select>

    <select id="slelectAll" resultType="com.lucas.mybatis.model.User">
    select  * from user
    </select>
    <insert id="insertUser" parameterType="com.lucas.mybatis.model.User">
        insert into user (name,age) value (#{name},#{age})
    </insert>
    <update id="updateUser" parameterType="com.lucas.mybatis.model.User">
        update  user set name= #{name},age= #{age} where id = #{id}
    </update>
    <delete id="deleteUser" parameterType="Integer">
        delete from user where id =  #{id}
    </delete>
</mapper>

applicationContext.xml

Spring配置文件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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!--    配置注解需要扫描的包-->
    <context:component-scan base-package="org.example.control"/>
    <context:component-scan base-package="org.example.mapper"/>
    <!-- 1.配置数据源 -->
    <bean id="dataSource"
          class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!-- 1.1.数据库驱动 -->
        <property name="driverClassName"
                  value="com.mysql.cj.jdbc.Driver"></property>
        <!-- 1.2.连接数据库的url -->
        <property name="url"
                  value="jdbc:mysql://localhost:3306/springtest?characterEncoding=utf8&amp;useSSL=false&amp;serverTimezone=UTC&amp;rewriteBatchedStatements=true"></property>
        <!-- 1.3.连接数据库的用户名 -->
        <property name="username" value="root"></property>
        <!-- 1.4.连接数据库的密码 -->
        <property name="password" value="123456"></property>
    </bean>
    <!--     开始事务支持-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>

    </bean>
    <!--    事务注解-->
    <tx:annotation-driven transaction-manager="txManager"/>

    <!-- 配置Mybatis工厂，指定数据源，SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置mapper.xml文件 -->
        <property name="configLocation" value="mybatis-config.xml"></property>
    </bean>

    <!--    使用Spring管理Mybatis数据操作接口-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.example.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
</beans>

创建日志配置文件log4j.properties

# 全局配置
log4j.rootLogger=ERROR,stdout
# MyBatis 日志配置
log4j.logger.org.example=DEBUG
# 控制台输出配置
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

第五步：添加测试代码

Controller

@Controller("userControl")
public class UserControl {
    @Autowired
    UserMapper userMapper;

    public MyUser slelectUserById(int id) {
        return userMapper.slelectUserById(id);
    }

    public List<MyUser> slelectAll() {
        return userMapper.slelectAll();
    }

    public void addUser(MyUser user) {
        userMapper.insertUser(user);
    }

    public void updateUser(MyUser user) {
        userMapper.updateUser(user);
    }

    public void deleteUser(int userId) {
        userMapper.deleteUser(userId);
    }

}

测试代码

public class App {

    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserControl userControl = (UserControl) applicationContext.getBean("userControl");


        // 增加一条数据
        MyUser myUser = new MyUser();
        myUser.setAge(30);
        myUser.setName("李四");
        userControl.addUser(myUser);


        // 查询所有的数据
        List<MyUser> list = userControl.slelectAll();
        for (MyUser myUser1 : list) {
            System.out.println(myUser1);
        }

        // 修改一条数据
        MyUser myUser2 = new MyUser();
        myUser2.setAge(20);
        myUser2.setId(3);
        myUser2.setName("王五");
        userControl.updateUser(myUser2);

        // 删除一条数据
        userControl.deleteUser(12);
    }
}

运行效果如下：

目录结构

完整的项目结构如下：