springboot---mybits整合

配置

POM文件

<parent>
<groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.6.RELEASE</version><relativePath />
</parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version>
</properties><dependencies><dependency><groupId>tk.mybatis</groupId><artifactId>mapper-spring-boot-starter</artifactId><version>RELEASE</version></dependency><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>RELEASE</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
</dependencies>

同一环境1.5.7.RELEASE版本的Spring-boot会抛Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver异常，1.5.6.RELEASE以及1.5.5.RELEASE版本亲测没问题

application.properties配置文件

#数据库
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=741852
spring.datasource.driver-class-name=com.mysql.jdbc.Driver#mybatis&&通用Mapper
mybatis.type-aliases-package=com.karle.bean
mybatis.mapper-locations=classpath:mapper/*.xml
mapper.mappers=com.karle.tk.TkMapper
mapper.identity=MYSQL#分页插件
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql#log
logging.file=logger.log
logging.level.*=debug

映射实体（省略字段get、set）

import java.util.Date;import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;@Table(name = "user")
public class User {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private Integer id;/*** 名称*/@Column(name = "name")private String name;/*** 年龄*/@Column(name = "age")private Integer age;/*** 身份编号*/@Column(name = "card_no")private Integer cardNo;/*** 生日*/@Column(name = "birthday")private Date birthday;
}

本地通用Mapper接口（继承通用Mapper接口）

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;public interface TkMapper<T> extends Mapper<T>, MySqlMapper<T> {}

Mapper接口：基本的增、删、改、查方法
MySqlMapper：针对MySQL的额外补充接口，支持批量插入

业务接口（继承“本地通用Mapper接口”）

import org.apache.ibatis.annotations.Param;import com.karle.bean.User;
import com.karle.tk.TkMapper;public interface UserMapper extends TkMapper<User> {public User selectByCardNo(@Param("cardNo") int cardNo);}

Spring-boot启动类，@MapperScan仅扫描业务接口包，不能扫描本地通用Mapper接口包，否则报java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class异常

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
@MapperScan(basePackages = { "com.karle.mapper" })
public class SpringBootMyBatisApplication {public static void main(String[] args) {SpringApplication.run(SpringBootMyBatisApplication.class, args);}}

通过使用@MapperScan可以指定要扫描的Mapper类的包的路径，比如：

@SpringBootApplication
@MapperScan("com.kfit.*.mapper")
public class App {  public static void main(String[] args) {  SpringApplication.run(App.class, args);  }
}

或者：

@SpringBootApplication
@MapperScan("com.kfit.mapper")
public class App {  public static void main(String[] args) {  SpringApplication.run(App.class, args);  }
}

可以根据包的结构指定不同的表达式。

使用@MapperScan注解多个包

可以使用如下的方式指定多个包：

@SpringBootApplication
@MapperScan({"com.kfit.demo","com.kfit.user"})
public class App {  public static void main(String[] args) {  SpringApplication.run(App.class, args);  }
}

如果mapper类没有在Spring Boot主程序可以扫描的包或者子包下面，可以使用如下方式进行配置：

@SpringBootApplication
@MapperScan({"com.kfit.*.mapper","org.kfit.*.mapper"})
public class App {  public static void main(String[] args) {  SpringApplication.run(App.class, args);  }
}

单元测试

import java.util.ArrayList;
import java.util.Date;
import java.util.List;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import com.github.pagehelper.PageHelper;
import com.karle.bean.User;
import com.karle.mapper.UserMapper;@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootMyBatisApplicationTests {@Autowiredprivate UserMapper mapper;// 插入一条新记录@Testpublic void insertOne() {User newUser = new User();int cardNo = (int) (Math.random() * 10000000);newUser.setAge(24);newUser.setBirthday(new Date());newUser.setName(cardNo + "用户");newUser.setCardNo(cardNo);mapper.insertSelective(newUser);System.out.println("插入成功");}// 批量插入记录@Testpublic void insertMore() {List<User> recordList = new ArrayList<User>();for (int i = 0; i < 2; i++) {User newUser = new User();int cardNo = (int) (Math.random() * 10000000);newUser.setAge(26);newUser.setBirthday(new Date());newUser.setName(cardNo + "批量插入用户");newUser.setCardNo(cardNo);recordList.add(newUser);}mapper.insertList(recordList);System.out.println("批量插入成功");}// 根据唯一编号查询用户(通用Mapper查询)@Testpublic void selectByCardNo() {User paramBean = new User();paramBean.setCardNo(6647403);User dbUser = mapper.selectOne(paramBean);if (dbUser != null) {System.out.println("数据库用户(通用Mapper查询)：" + dbUser.getName());return;}System.out.println("查无此用户");}// 根据唯一编号查询用户(XML查询)@Testpublic void selectByCardNoByXml() {User dbUser = mapper.selectByCardNo(6105967);if (dbUser != null) {System.out.println("数据库用户(XML查询)：" + dbUser.getName());return;}System.out.println("查无此用户");}// 根据年龄查询一组用户@Testpublic void selectByAge() {User paramBean = new User();paramBean.setAge(24);List<User> dbUserList = mapper.select(paramBean);System.out.println("总共查询数：" + dbUserList.size());}// 分页查询用户@Testpublic void selectByPage() {PageHelper.offsetPage(1, 5);List<User> dbUserList = mapper.select(null);for (User item : dbUserList) {System.out.println("分页用户：" + item.getName());}}// 更新用户信息@Testpublic void updateOneInfo() {User paramBean = new User();paramBean.setId(1);paramBean.setAge(26);mapper.updateByPrimaryKeySelective(paramBean);System.out.println("更新成功");}}

事务的使用

spring Boot 使用事务非常简单，首先使用注解 @EnableTransactionManagement开启事务支持后，然后在访问数据库的Service方法上添加注解 @Transactional 便可。

@EnableTransactionManagement放在启动类上