Spring整合Mybatis

Posted 2020-11-30 慕容子月

一、基于XML

　　实体类

package cn.spring.entity;

import java.io.Serializable;

public class Bank implements Serializable {
    private String card_code;       //卡号
    private String user_name;       //所属人姓名
    private double card_balance;    //卡内余额

    public String getCard_code() {
        return card_code;
    }

    public void setCard_code(String card_code) {
        this.card_code = card_code;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public double getCard_balance() {
        return card_balance;
    }

    public void setCard_balance(double card_balance) {
        this.card_balance = card_balance;
    }
}

　　Dao层接口和XML配置文件

Dao层接口
@Repository
public interface IBankDao {
    public List<Bank> getAllBank();
}
XML配置文件
<?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">
<!--小配置根节点 namespace代表命名空间-->
<mapper namespace="cn.spring.dao.IBankDao">
    <select id="getAllBank" resultType="Bank">
        select * from bank
    </select>
</mapper>

　　Service层接口和实现类

Service层接口
public interface IBankService {
    public List<Bank> getAllBank();
}
实现类public class IBankServiceImpl implements IBankService {
    @Resource
    private IBankDao iBankDao;
    @Override
    public List<Bank> getAllBank() {
        return iBankDao.getAllBank();
    }

    public IBankDao getiBankDao() {
        return iBankDao;
    }

    public void setiBankDao(IBankDao iBankDao) {
        this.iBankDao = iBankDao;
    }
}

　　applicationContext.xml大配置文件

<!--加载配置文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--配置数据源-->
    <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}"/>
    </bean>
    <!--配置SqlSessionFactoryBean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--加载Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--扫描Dao层，省略代码-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.spring.dao"/>
    </bean>
    <!--注入Dao层-->
    <bean id="iBankDao" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="cn.spring.dao.IBankDao"/>
        <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
    </bean>
    <!--Service层-->
    <bean id="iBankService" class="cn.spring.service.impl.IBankServiceImpl">
        <property name="iBankDao" ref="iBankDao"/>
    </bean>

　　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>
    <!--配置别名-->
    <typeAliases>
        <package name="cn.spring.entity"/>
    </typeAliases>
    <!--加载小配置文件-->
    <mappers>
        <package name="cn.spring.dao"/>
    </mappers>
</configuration>

　　测试类

public class SpringMybaitsTest {
    public static void main(String[] args) {
        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
        IBankService iBankService = (IBankService)ctx.getBean("iBankService");
        
        List<Bank> allBank = iBankService.getAllBank();
        for(Bank bank:allBank){
            System.out.println(bank.getUser_name());
        }
    }
}

二、基于注解配置

　　修改上面案例，使用注解注入Dao层

/**
 * Dao层接口
 */
@Repository
public interface IBankDao {
    public List<Bank> getAllBank();
}

　　使用注解注入Service层，并且使用注解调用Dao层对象

@Service("iBankService")
public class IBankServiceImpl implements IBankService {
    @Resource
    private IBankDao iBankDao;
    @Override
    public List<Bank> getAllBank() {
        return iBankDao.getAllBank();
    }
}

　　修改applicationContext.xml大配置文件，开启注解扫描

<!--扫描注解-->
    <context:component-scan base-package="cn.spring"/>
    <!--加载配置文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--配置数据源-->
    <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}"/>
    </bean>
    <!--配置SqlSessionFactoryBean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--加载Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--扫描Dao层，省略代码-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.spring.dao"/>
    </bean>

其他的不变