Spring整合Mybatis浅尝

　　初学，记录自己学习整合两个框架的过程，里面也有很多踩过的坑，也有没有解决的问题，先记录下来。等待解决。

废话不多说，直接开始了。先上pom.xml配置文件。

This is my pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>Sping_Mybatis</groupId>
    <artifactId>spring_mybatis_test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
            <scope>test</scope>
        </dependency>
        <dependency><!-- spring对测试框架的简单封装功能 -->
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.2.0.RELEASE</version>
            <scope>test</scope>
        </dependency>

        <!-- 数据源 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.0.8</version>
        </dependency>

        <!-- Mybatis3.4.1 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.1</version>
        </dependency>

        <!-- spring整合mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>

        <!-- Spring-4.2.0 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

    </dependencies>

</project>

　　贴上一张项目目录的图

再来看mybatisConfig.xml的配置

　　数据源在spring的配置文件里，同时spring文件里配置了自动扫描Mapper。故在此不用再次编写<mappers>中的内容

<?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>
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <typeAliases>
        <typeAlias type="com.lpp.test.entity.Car" alias="car"/>
    </typeAliases>
    <!--<mappers>
        <mapper url="config/sqlMapper/CarMapper.xml"/>
    </mappers>-->
</configuration>

　　此时再来看spring_mybatis.xml的配置，在这里面有个问题暂时还未解决。把jdbc.properties放在resource目录下之后，在spring配置中引入失败。在配置数据源时候，变量失效，暂时没有解决是什么问题，先放在这里吧。等待以后回过头解决。配置的很简单，就是测试使用。

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       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">

    <context:component-scan base-package="com.lpp.test"/>
    <!--<context:property-placeholder location="classpath:jdbc.properties"/>

    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>-->
    <!--配置数据源-->
    <bean id="dataSource"
          class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"
          p:driverClassName="com.mysql.jdbc.Driver"
          p:url="jdbc:mysql://localhost:3306/test"
          p:username="root"
          p:password=""
    /><!--${driverClasss}${jdbcUrl}${username}com.mysql.jdbc.Driver-->

    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean"
          p:dataSource-ref="dataSource"
          p:configLocation="classpath:config/mybatisConfig.xml"
          p:mapperLocations="classpath:config/sqlMapper/*.xml"/>
    <!--这里使用spring提供的SQLSessionTemplate-->
    <bean class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg ref="sqlSessionFactory"/>
    </bean>

    <!-- 扫描直接使用mapper接口类操作dao，并直接纳入IOC容器管理 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
          p:sqlSessionFactory-ref="sqlSessionFactory"
          p:basePackage="com.lpp.test.dao">
    </bean>
</beans>

　　接下来是Mapper.xml的配置，三种配置效果差不多是一样的，写法上不太相同，跟carMapper接口对比来看就知道是三种方式。

<?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.lpp.test.dao.carMapper">
    <select id="findCarbyId" parameterType="int" resultType="Car">
        SELECT id,car_name AS carName,maxSpeed FROM t_car WHERE id = #{id}
    </select>
    <select id="findCarbyIdAndName" resultType="Car">
        SELECT * FROM t_car WHERE id = #{id} AND car_name = #{car_name};
    </select>
    <select id="findCarbyIdAndSpeed" resultType="Car">
        SELECT * FROM t_car WHERE id = #{id} AND maxSpeed = #{maxSpeed};
    </select>
</mapper>

　　carMapper接口

package com.lpp.test.dao;

import com.lpp.test.entity.Car;
import org.apache.ibatis.annotations.Param;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-17
 * Time: 19:44
 */
public interface carMapper {
    public Car findCarbyId(int id);
    public Car findCarbyIdAndName(@Param("id") int id, @Param("car_name") String car_name);
    public Car findCarbyIdAndSpeed(Car car);
}

　　

　　贴上log4j.properties的配置

# Global logging configuration\uff0c\u5efa\u8bae\u5f00\u53d1\u73af\u5883\u4e2d\u8981\u7528debug
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

　　entity下的实体 car.java

package com.lpp.test.entity;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-16
 * Time: 11:06
 */
public class Car {
    int id;
    String carName;
    int maxSpeed;

    public Car() {
    }

    public Car(int id, String carName, int maxSpeed) {
        this.id = id;
        this.carName = carName;
        this.maxSpeed = maxSpeed;
    }

    public int getId() {
        return id;
    }


    public String getCarName() {
        return carName;
    }

    public int getMaxSpeed() {
        return maxSpeed;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String car_name) {
        this.carName = carName;
    }

    public void setMaxSpeed(int maxSpeed) {
        this.maxSpeed = maxSpeed;
    }

    @Override
    public String toString() {
        return "Car{" +
                "id=" + id +
                ", name='" + carName + '\'' +
                ", maxSpeed=" + maxSpeed +
                '}';
    }
}

　　最后是测试方法，我创建了一个测试方法和一个主方法测试，代码分别如下。

test方法

package com.lpp.test.dao;

import com.lpp.test.entity.Car;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import static org.junit.Assert.*;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-27
 * Time: 17:36
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:config/spring-mybatis.xml")
public class carMapperTest {
    @Autowired
    carMapper carMapper;
    @Test
    public void findCarbyIdAndName() {
        Car car = carMapper.findCarbyIdAndName(1,"aodi");
        System.out.println(car);
    }
}

　　主方法

package com.lpp.test.main;

import com.lpp.test.dao.carMapper;
import com.lpp.test.entity.Car;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-25
 * Time: 17:44
 */
public class testMain {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("config/spring-mybatis.xml");
        carMapper carMapper = ctx.getBean(com.lpp.test.dao.carMapper.class);

        Car car = null;
        car = carMapper.findCarbyId(1);
        System.out.println(car.toString());
    }
}

　　两种测试方法结果是相同的，调用了不同的查询函数。以上就是我做整合的步骤，初次尝试，难免有些问题，希望能让大家收获一些东西。