MyBatis整合Spring

导包

创建UserMapper这个类

package oyb.mapper;
import oyb.model.User;
public interface UserMapper {
    public User findUserById(int id);
}

配置UserMapper.xml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="oyb.mapper.UserMapper">
    <!--
        id:statement的id，要求在命名空间内唯一
        parameterType:传入的参数类型
        resultType:返回的类型
        #{id}：表示该占位符待接收参数的名称为id。
    -->
    <select id="findUserById" parameterType="int" resultType="user">
        SELECT * FROM USER WHERE id = #{id}
    </select>


</mapper>

配置sqlMapConfig.xml文件

<?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="oyb.model"></package>
    </typeAliases>

    <!--告诉mybatis加载映射文件-->
    <mappers>
        <package name="oyb.mapper"></package>
    </mappers>
</configuration>

配置Spring的applicationContext.xml文件

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">


    <!-- 1.配置数据库，dbcp数据库连接池-->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatisday01?useUnicode=true&amp;characterEncoding=utf8"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>

        <!-- 最大连接  -->
        <property name="maxActive" value="10"/>
        <!--最大空闲数  -->
        <property name="maxIdle" value="5"/>
    </bean>
    <!--配置sqlSessionFactory-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="classpath:SqlMapConfig.xml"></property>
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="oyb.mapper.UserMapper"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"></property>
    </bean>
</beans>

测试方法

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import oyb.mapper.UserMapper;

public class test {

    @Test
    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        UserMapper userMapper = (UserMapper) context.getBean("userMapper");
        System.out.println(userMapper.findUserById(1));
    }
}