Spring与Mybatis整合

Spring 与Mybatis整合

项目结构如图：

一、导入依赖

spring整合mybatis核心jar包

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

spring 所需要的jar包

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.0.0.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>4.0.0.RELEASE</version>
</dependency>

mysql数据库jar包

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.8</version>
</dependency>

数据源这里分为c3p0、dbcp(自行选择一种)

c3p0数据源

<!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->
<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.2</version>
</dependency>

dbpc数据源

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.3.9</version>
</dependency>

<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
</dependency>

<dependency>
    <groupId>commons-pool</groupId>
    <artifactId>commons-pool</artifactId>
    <version>1.5.4</version>
</dependency>

<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.2</version>
</dependency>

二、创建mapper、pojo类

先创建MyUserMapper接口

import java.util.List;

public interface MyUserMapper {

   List<MyUser> selectMyUser() throws Exception;
}

MyUserMapper.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="com.hzc.mapper.MyUserMapper">
    <select id="selectMyUser" resultType="com.hzc.pojo.MyUser">
        select *from myuser;
    </select>
</mapper>

pojo类

@Data
@NoArgsConstructor
@AllArgsConstructor
public class MyUser {

    //    用户表的实体类；
    private  int id;
    private String username;
    private Date birthday;
    private String sex;
    private String address;

}

三、resources文件

c3p0.propertie

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test3
jdbc.username=root
jdbc.password=123456

db.properties

jdbc.url=jdbc:mysql://localhost:3306/test3?useUnicode=true&characterEncoding=UTF-8
#使用username项目会报错 bean.xml文件中value值调用会报错
jdbc.username=root
jdbc.password=123456
jdbc.driver=com.mysql.jdbc.Driver
jdbc.initialSize=20
jdbc.minIdle=5
jdbc.maxActive=30

log4j.properties

# Global logging configuration
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

配置SqlMapperConfig.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>
    <!--由于我们现在数据库连接操作都交给我们的spring； 只需要一个mapper；
        datasorces交给spring进行注入； 属性文件也是在spring里边做即可-->
    <mappers>
        <mapper resource="com\hzc\mapper\MyUserMapper.xml"></mapper>
    </mappers>
</configuration>

配置bean.xml

根据你使用的数据源选择

<?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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.1.xsd
    http://www.springframework.org/schema/mvc">

    <context:component-scan base-package="com.hzc.pojo"></context:component-scan>

    <!--根据数据源选择文件载入-->
    <context:property-placeholder location="db.properties"></context:property-placeholder> 

    <!--配置dbcp数据源-->
    <!--使用dbcp要导入spring-jdbc jar包-->
    <bean id="DbcpDataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}" />
        <property name="url" value="${jdbc.url}" />
        <property name="initialSize" value="${jdbc.initialSize}" />
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="minIdle" value="${jdbc.minIdle}" />
    </bean>

    <!--c3p0数据库连接池  -->
<!--    <bean id="dataSource01" class="com.mchange.v2.c3p0.ComboPooledDataSource">-->
<!--    <property name="driverClass" value="${jdbc.driver}"/>-->
<!--    <property name="jdbcUrl" value="${jdbc.url}"/>-->
<!--    <property name="user" value="${jdbc.username}"/>-->
<!--    <property name="password" value="${jdbc.password}"/>-->
<!--    &lt;!&ndash;  初始连接池大小 &ndash;&gt;-->
<!--    <property name="initialPoolSize" value="10"/>-->
<!--    &lt;!&ndash;  连接池中连接最小个数 &ndash;&gt;-->
<!--    <property name="minPoolSize" value="5"/>-->
<!--    <property name="maxPoolSize" value="20"/>-->
<!--    </bean>-->

    <!-- mybatis他要进行连接需要我们的数据源；这个数据源传入给你的 sqlsessionFactory-->
    <bean id="sqlsessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--加载数据源-->
        <property name="dataSource" ref="DbcpDataSource"></property>
        <!--加载你的映射-->
        <property name="mapperLocations" value="com/hzc/mapper/MyUserMapper.xml"></property>
    </bean>

    <!--配置userMapper对象(传递接口进来)-->
    <bean id="myUserMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <!--传递工厂-->
        <property name="sqlSessionFactory" ref="sqlsessionFactory"></property>

        <property name="mapperInterface" value="com.hzc.mapper.MyUserMapper"></property>
    </bean>
</beans>

四、测试

测试时，通过ClassPathXmlApplicationContext读取"bean.xml"

public class springMybatisTest {
    public static void main(String[] args) throws Exception {
        ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
        System.out.println(context);

        MyUserMapper bean = context.getBean(MyUserMapper.class);
        List<MyUser> myUsers = bean.selectMyUser();

        for (MyUser myuser:myUsers) {
            System.out.println(myuser.getUsername()+""+myuser.getId());
        }
    }
}