mybatis+maven实例

1、创建表，并插入数据：

CREATE TABLE `alu`.`t_user` (  `USER_ID` int(11) NOT NULL AUTO_INCREMENT,  `USER_NAME` char(30) NOT NULL,  `USER_PASSWORD` char(10) NOT NULL,  PRIMARY KEY (`USER_ID`),  KEY `IDX_NAME` (`USER_NAME`)) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8INSERT INTO alu.t_user (USER_ID, USER_NAME, USER_PASSWORD) VALUES (1, 'luzhijian', '123456');

2、添加包的依赖：

<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>  <groupId>com.alu</groupId>  <artifactId>mybatis_maven_project</artifactId>  <version>0.0.1-SNAPSHOT</version>    <properties><!-- spring版本号 --><spring.version>4.3.0.RELEASE</spring.version><!-- junit版本号 --><junit.version>4.12</junit.version><!-- mybatis版本号 --><mybatis.version>3.2.1</mybatis.version>  </properties>    <dependencies><!-- 添加Spring依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><!--单元测试依赖 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version><scope>test</scope></dependency><!--spring单元测试依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring.version}</version><scope>test</scope></dependency><!--mybatis依赖 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>${mybatis.version}</version></dependency><!-- mybatis/spring包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.2.0</version></dependency><!-- mysql驱动包 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.29</version></dependency></dependencies></project>

3、配置文件：

3.1、mybatis包下添加mybatis-config.xml文件（mybatis配置文件）：

<?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>    </configuration>

3.2、properties包下添加jdbc.properties文件（数据源配置文件）：

jdbc_driverClassName=com.mysql.jdbc.Driverjdbc_url=jdbc:mysql://localhost:3306/alujdbc_username=rootjdbc_password=luzhijian

3.3、mapper包下userMapper.xml配置文件（表映射文件）：

<?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="com.alu.dao.UserDao"><!--设置domain类和数据库中表的字段一一对应，注意数据库字段和domain类中的字段名称不致，此处一定要！--><resultMap id="BaseResultMap" type="com.alu.domain.User"><id column="USER_ID" property="userId" jdbcType="INTEGER" /><result column="USER_NAME" property="userName" jdbcType="CHAR" /><result column="USER_PASSWORD" property="userPassword" jdbcType="CHAR" /></resultMap><!-- 查询单条记录 --><select id="selectUserById" parameterType="int" resultMap="BaseResultMap">SELECT * FROM t_user WHERE USER_ID = #{userId}</select></mapper>

3.4、spring配置文件application.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"xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="             http://www.springframework.org/schema/beans             http://www.springframework.org/schema/beans/spring-beans-3.0.xsd             http://www.springframework.org/schema/aop             http://www.springframework.org/schema/aop/spring-aop-3.0.xsd           http://www.springframework.org/schema/context             http://www.springframework.org/schema/context/spring-context-3.0.xsd">          <!-- 引入jdbc配置文件 -->       <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">        <property name="locations">            <list>               <value>classpath:properties/*.properties</value>                <!--要是有多个配置文件，只需在这里继续添加即可 -->            </list>        </property>    </bean>        <!-- 配置数据源 --><bean id="dataSource"class="org.springframework.jdbc.datasource.DriverManagerDataSource"><!-- 不使用properties来配置 --><!-- <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/learning" /> <property name="username" value="root" /> <property name="password" value="christmas258@" /> -->   <!-- 使用properties来配置 --><property name="driverClassName"><value>${jdbc_driverClassName}</value></property><property name="url"><value>${jdbc_url}</value></property><property name="username"><value>${jdbc_username}</value></property><property name="password"><value>${jdbc_password}</value></property></bean><!-- 自动扫描了所有的XxxxMapper.xml对应的mapper接口文件，这样就不用一个一个手动配置Mpper的映射了，只要Mapper接口类和Mapper映射文件对应起来就可以了。 --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage"value="com.alu.dao" /></bean>    <!-- 配置Mybatis的文件 ，mapperLocations配置**Mapper.xml文件位置，configLocation配置mybatis-config文件位置--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" />        <property name="mapperLocations" value="classpath:mapper/*.xml"/>  <property name="configLocation" value="classpath:mybatis/mybatis-config.xml" /><!-- <property name="typeAliasesPackage" value="com.tiantian.ckeditor.model" /> --></bean><!-- 自动扫描注解的bean --><context:component-scan base-package="com.alu.service" /></beans>

4、接口和类的配置：

4.1、com.luo.domain下添加User.java文件：

package com.alu.domain;public class User {private Integer userId;      private String userName;      private String userPassword;        public Integer getUserId() {          return userId;      }        public void setUserId(Integer userId) {          this.userId = userId;      }        public String getUserName() {          return userName;      }        public void setUserName(String userName) {          this.userName = userName;      }        public String getUserPassword() {          return userPassword;      }        public void setUserPassword(String userPassword) {          this.userPassword = userPassword;      }    }

4.2、com.luo.dao下添加UserDao.java文件：

package com.alu.dao;import com.alu.domain.User;public interface UserDao {/** * @param userId * @return User */public User selectUserById(Integer userId);  }

4.3、com.luo.service下添加UserService.java接口和UserServiceImpl实现类：

package com.alu.service;import com.alu.domain.User;public interface UserService {User selectUserById(Integer userId);  }

package com.alu.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.alu.dao.UserDao;import com.alu.domain.User;@Service  public class UserServiceImpl implements UserService {@Autowired      private UserDao userDao;        public User selectUserById(Integer userId) {          return userDao.selectUserById(userId);                }  }

5、单元测试

5.1、com.luo.baseTest下添加SpringTestCase.java：

package com.alu.baseTest;import org.junit.runner.RunWith;  import org.springframework.test.context.ContextConfiguration;  import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;  import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  //指定bean注入的配置文件  @ContextConfiguration(locations = { "classpath:application.xml" })  //使用标准的JUnit @RunWith注释来告诉JUnit使用Spring TestRunner  @RunWith(SpringJUnit4ClassRunner.class)  public class SpringTestCase extends AbstractJUnit4SpringContextTests {}

5.2、com.luo.service添加UserServiceTest.java：

package com.alu.service;import org.junit.Test;  import org.springframework.beans.factory.annotation.Autowired;import com.alu.baseTest.SpringTestCase;import com.alu.domain.User;import com.alu.service.UserService;public class UserServiceTest extends SpringTestCase {@Autowired      private UserService userService; @Test      public void selectUserByIdTest(){          User user = userService.selectUserById(1);          System.out.println(user.getUserName() + ":" + user.getUserPassword());    }  }

5.3、运行单元测试，UserServiceTest右键Run As –>Junit Test，运行结果：