mybatis笔记<二> 整合spring

mybatis与spring整合需要添加几个jar包，mybatis-spring， spring-context， spring-jdbc

1. spring ioc只要一个jar包就ok

2. 我用了c3p3数据库连接池

跟笔记<一>比，需要修改的地方

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>com.gxf.mybatis</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>
        <!-- c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <!-- spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.0.4.RELEASE</version>
        </dependency>

    </dependencies>

</project>

添加beans.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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mapperLocations" value="classpath*:mapper/*.xml"/>
    </bean>
    <bean id="personMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="com.gxf.mybatis.mapper.PersonMapper" />
        <property name="sqlSessionFactory" ref="sqlSessionFactory" />
    </bean>

    <bean id="dataSource"
          class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="${jdbc.driverClassName}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <context:property-placeholder location="jdbc.properties"/>

</beans>

jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost/db_test
jdbc.username=root
jdbc.password=luckygxf

测试类main方法

package com.gxf.mybatis.util;

import com.gxf.mybatis.mapper.PersonMapper;
import com.gxf.mybatis.mapper.PersonMapper1;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class PersonTableOps {
    private static SqlSessionFactory sqlSessionFactory = SqlSessionFactoryHelper.getSqlSessionFactory();
    private static PersonMapper personMapper;

    public static void main(String[] args) {
        testSpringMybatis();
    }

    private static void testSpringMybatis(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
        personMapper = (PersonMapper) applicationContext.getBean("personMapper");
        Person person = personMapper.selectPerson(1);
        System.out.println(person);
    }

    /**
     * test mybatis select method
     * */
    private static void testSelectOnes(){
        //        selectOne1();
//        selectOne2();
        selectOne3();
    }

    /**
     * 第一种方式
     * */
    public static void selectOne1(){
        SqlSession session = sqlSessionFactory.openSession();
        try {
            Person person = session.selectOne(
                    "com.gxf.mybatis.mapper.PersonMapper.selectPerson", 1);
            System.out.println(person);
        } finally {
            session.close();
        }
    }

    /**
     * 第二种方式
     * */
    public static void selectOne2(){
        SqlSession session = sqlSessionFactory.openSession();
        try {
            PersonMapper mapper = session.getMapper(PersonMapper.class);
            Person person = mapper.selectPerson(1);
            System.out.println(person);
        } finally {
            session.close();
        }

    }

    /**
     * 第三种方式
     * */
    public static void selectOne3(){
        SqlSession session = sqlSessionFactory.openSession();
        try {
            sqlSessionFactory.getConfiguration().addMapper(PersonMapper1.class);
            PersonMapper1 mapper = session.getMapper(PersonMapper1.class);
            Person person = mapper.selectPerson(1);
            System.out.println(person);
        } finally {
            session.close();
        }
    }

    public static SqlSessionFactory getSqlSessionFactory() {
        return sqlSessionFactory;
    }

    public static void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
        PersonTableOps.sqlSessionFactory = sqlSessionFactory;
    }

    public PersonMapper getPersonMapper() {
        return personMapper;
    }

    public void setPersonMapper(PersonMapper personMapper) {
        this.personMapper = personMapper;
    }
}

以前没有想到的

1. spring ioc 一个jar包搞定

2. 使用配置文件，占位符

接下来要看下mybatis源码，还有spring整合到一起的源码，出个笔记