mybatis和spring的整合

Mybatis与Spring的集成

1.配置Spring环境

创建maven工程

pom.xml导入依赖

 <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>
     <parent>
         <groupId>cn.itcast.parent</groupId>
         <artifactId>itcast-parent</artifactId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
     <groupId>cn.itcast.mybatis</groupId>
     <artifactId>itcast-mybatis-spring</artifactId>
     <version>1.0.0-SNAPSHOT</version>

     <dependencies>
         <!-- 单元测试 -->
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
             <scope>test</scope>
         </dependency>
         <!-- Mybatis -->
         <dependency>
             <groupId>org.mybatis</groupId>
             <artifactId>mybatis</artifactId>
         </dependency>
         <!-- MySql -->
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
         </dependency>
         <dependency>
             <groupId>cglib</groupId>
             <artifactId>cglib</artifactId>
             <version>3.1</version>
         </dependency>
         <dependency>
             <groupId>com.github.pagehelper</groupId>
             <artifactId>pagehelper</artifactId>
             <version>3.7.5</version>
         </dependency>
         <dependency>
             <groupId>com.github.jsqlparser</groupId>
             <artifactId>jsqlparser</artifactId>
             <version>0.9.1</version>
         </dependency>

         <!-- 整合 -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context</artifactId>
         </dependency>
         <dependency>
             <groupId>org.mybatis</groupId>
             <artifactId>mybatis-spring</artifactId>
         </dependency>

         <!-- 连接池 -->
         <dependency>
             <groupId>com.jolbox</groupId>
             <artifactId>bonecp-spring</artifactId>
             <version>0.8.0.RELEASE</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-jdbc</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-aspects</artifactId>
         </dependency>
     </dependencies>
 </project>

创建applicationContext.xml文件

jdbc.properties

 jdbc.driver=com.mysql.jdbc.Driver
 jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis_0716?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
 jdbc.username=root
 jdbc.password=123456

applicationContext.xml（配置资源文件替换器、配置数据源）

 <?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"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 使用spring自带的占位符替换功能 -->
     <bean
         class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
         <!-- 允许JVM参数覆盖 -->
         <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
         <!-- 忽略没有找到的资源文件 -->
         <property name="ignoreResourceNotFound" value="true" />
         <!-- 配置资源文件 -->
         <property name="locations">
             <list>
                 <value>classpath:jdbc.properties</value>
             </list>
         </property>
     </bean>

     <bean id="dataSource" class="com.jolbox.bonecp.BoneCPDataSource"
         destroy-method="close">
         <!-- 数据库驱动 -->
         <property name="driverClass" value="${jdbc.driver}" />
         <!-- 相应驱动的jdbcUrl -->
         <property name="jdbcUrl" value="${jdbc.url}" />
         <!-- 数据库的用户名 -->
         <property name="username" value="${jdbc.username}" />
         <!-- 数据库的密码 -->
         <property name="password" value="${jdbc.password}" />
         <!-- 检查数据库连接池中空闲连接的间隔时间，单位是分，默认值：240，如果要取消则设置为0 -->
         <property name="idleConnectionTestPeriod" value="60" />
         <!-- 连接池中未使用的链接最大存活时间，单位是分，默认值：60，如果要永远存活设置为0 -->
         <property name="idleMaxAge" value="30" />
         <!-- 每个分区最大的连接数 -->
         <property name="maxConnectionsPerPartition" value="150" />
         <!-- 每个分区最小的连接数 -->
         <property name="minConnectionsPerPartition" value="5" />
     </bean>

 </beans>

applicationContext-mybatis.xml（SqlSessionFactory）

 <?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"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 定义Mybatis的SqlSessionFactory -->
     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <!-- 定义数据源 -->
         <property name="dataSource" ref="dataSource" />
         <!-- 指定mybatis全局配置文件 -->
         <property name="configLocation" value="classpath:mybatis-config.xml"></property>

         <!-- 扫描mappers目录以及子目录下的所有xml文件 -->
           <property name="mapperLocations" value="classpath:mappers/**/*.xml" />

           <!-- 别名扫描包 -->
           <property name="typeAliasesPackage" value="cn.itcast.mybatis.pojo"/>
     </bean>

 </beans>

mybatis-config.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>

     <settings>
         <!-- 开启驼峰自动映射 -->
         <setting name="mapUnderscoreToCamelCase" value="true" />
     </settings>

 </configuration>

单元测试：

UserMapperTest

 package cn.itcast.mybatis.mapper;

 import org.apache.ibatis.session.SqlSession;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.junit.Before;
 import org.junit.Test;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 import cn.itcast.mybatis.pojo.User;

 public class UserMapperTest {

     private UserMapper userMapper;

     @Before
     public void setUp() throws Exception {
         // 初始化SPring容器
         ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml",
                 "applicationContext-mybatis.xml");
         //从容器中获取SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = applicationContext.getBean(SqlSessionFactory.class);
         SqlSession sqlSession = sqlSessionFactory.openSession(true);
         this.userMapper = sqlSession.getMapper(UserMapper.class);
     }

     @Test
     public void testQueryUserById() {
         User user = this.userMapper.queryUserById(1L);
         System.out.println(user);
     }

 }

测试成功：

注意：我的mysql数据库用户名和密码是root root

所以要修改jdbc.properties设置

 jdbc.driver=com.mysql.jdbc.Driver
 jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
 jdbc.username=root
 jdbc.password=root

所以对应的改成：

定义Mapper接口

在Spring容器中定义Mapper接口，无需手动获取SqlSessionFactory获取Session以及Mapper，只需要从Spring容器中获取即可。

配置Mapper接口的自动扫描器

多个包怎么配置，可以用逗号

通配符配置Mapper.xml和别名扫描包