Mybatis学习笔记（八）mybatis整合spring

项目结构

一、导入依赖

 <!--MySQL驱动-->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.47</version>
</dependency>
<!--c3p0-->
<dependency>
  <groupId>com.mchange</groupId>
  <artifactId>c3p0</artifactId>
  <version>0.9.5.2</version>
</dependency>
<!--mybatis-->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.4.6</version>
</dependency>
<!--spring -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>5.1.5.RELEASE</version>
</dependency>
<!--整合包-->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>1.3.2</version>
</dependency>

二、配置jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost/gu
username=root
password=root

三、配置mybatis.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>
    <!--实体别名-->
    <typeAliases>
        <package name="com.gu.mybatis.entity"/>
    </typeAliases>
</configuration>

四、配置spring.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.xsd
http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context.xsd
">
    <!--加载配置-->
    <!--<context:property-placeholder location="jdbc.properties"/> 这种方式会报错，不知道为什么-->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
            </list>
        </property>
    </bean>
    <!--扫描注解-->
    <context:component-scan base-package="com.gu.mybatis.*"/>
    <!--数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="password" value="${password}"/>
        <property name="user" value="${username}"/>
        <property name="driverClass" value="${driver}"/>
        <property name="jdbcUrl" value="${url}"/>
        <property name="maxPoolSize" value="5"/>
        <property name="initialPoolSize" value="2"/>
        <property name="minPoolSize" value="2"/>
    </bean>
    <!--sqlSessionFactory工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:Mybatis.xml"/>
    </bean>
    <!--加载mapper-->
    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.gu.mybatis.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
</beans>

五、实体类

六、映射

userMapper.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.gu.mybatis.mapper.UserMapper">
    <resultMap id="baseResultMap" type="User">
        <id column="user_id" property="id"/>
        <result column="user_name" property="name"/>
    </resultMap>
    <select id="queryAll" resultMap="baseResultMap">
        select * from users
    </select>
</mapper>

userMapper.java

public interface UserMapper {
    List<User> queryAll();
}

七、测试

console