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所有属性必须是包装类
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一个类对应一张表
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一个对象对应一条记录
首先建立一张表
Snipaste_2019-03-12_17-14-26.png
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配置文件
<?xml version="1.0" encoding="UTF-8"?>
<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.spring</groupId>
<artifactId>orm</artifactId>
<version>1.0-SNAPSHOT</version>
<name>orm</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<spring.version>5.1.5.RELEASE</spring.version>
<aspectj.version>1.9.2</aspectj.version>
<junit.version>4.12</junit.version>
<log4j.version>1.2.17</log4j.version>
<slf4j.version>1.7.12</slf4j.version>
<mysql.version>5.1.47</mysql.version>
<mybatis.version>3.5.0</mybatis.version>
<mybatis-spring.version>2.0.0</mybatis-spring.version>
<tk-mybatis.version>4.1.5</tk-mybatis.version>
<druid.version>1.1.14</druid.version>
<lombok.version>1.18.6</lombok.version>
</properties>
<dependencies>
<!--Spring相关依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</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>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!--mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!--mybatis-spring依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis-spring.version}</version>
</dependency>
<!--通用mapper依赖-->
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper</artifactId>
<version>${tk-mybatis.version}</version>
</dependency>
<!--druid连接池依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<!--lombok依赖-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!--junit依赖-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<!-- log4j日志依赖 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
通过注解注释写一个实体User
@Table(name = "t_user")
@Data
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String account;
private String password;
private Integer credits;
}
- 通用接口BaseDAO
public interface BaseDAO<T> extends Mapper<T>,MySqlMapper<T> {
}
- UserDAO继承BaseDAO实现CRUD(增删改查)
public interface UserDAO extends BaseDAO<User> {
}
业务逻辑层
创建一个接口public interface UserService {
/**
* 新增用户
*
* @param user
* @return
*/
int insertUser(User user);
/**
* 根据id删除用户
*
* @param id
* @return
*/
int deleteUser(long id);
/**
* 更新用户
*
* @param user
* @return
*/
int updateUser(User user);
/**
* 查询所有用户
*
* @return
*/
List<User> selectUsers();
/**
*@param id
* @return
*
*/
User getUser(long id);
}
实现类
//标注本类是一个Service组件
@Service
//在service层启动事务
@Transactional
public class UserServiceImpl implements UserService {
@Autowired
private UserDAO userDao;
@Override
public int insertUser(User user)
{
return userDao.insert(user);
}
@Override
public int deleteUser(long id) {
return userDao.deleteByPrimaryKey(id);
}
@Override
public int updateUser(User user) {
return userDao.updateByPrimaryKey(user);
}
@Override
public List <User> selectUsers() {
return userDao.selectAll();
}
@Override
public User getUser(long id) {
return userDao.selectByPrimaryKey( id );
}
}
测试类
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"/spring_mybatis.xml"})
public class UserServiceImplTest {
@Autowired
private UserService userService;
@Test
public void insertUser() throws Exception {
User user = new User();
user.setAccount("e");
user.setCredits(500 );
user.setPassword("555");
int n = userService.insertUser( user );
assertEquals(1,n);
}
@Test
public void deleteUser() throws Exception {
int n = userService.deleteUser(3);
assertEquals(1,n);
}
@Test
public void updateUser() throws Exception {
User user = userService.getUser(2);
user.setPassword( "1702343131" );
user.setCredits( 8888888 );
int n = userService.updateUser( user );
assertEquals( 1,n);
}
@Test
public void selectUsers() throws Exception {
List<User> users = userService.selectUsers();
users.forEach(user -> System.out.println(user));
}
@Test
public void getUser() throws Exception {
User user = userService.getUser(2);
System.out.println(user);
}
}
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