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>

同一環境1.5.7.RELEASE版本的Spring-boot會拋Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver異常，1.5.6.RELEASE以及1.5.5.RELEASE版本親測沒問題

application.properties配置文件

#數據庫 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#分頁插件 pagehelper.helperDialect=mysql pagehelper.reasonable=true pagehelper.supportMethodsArguments=true pagehelper.params=count=countSql#log logging.file=logger.log logging.level.*=debug

映射實體（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;/*** 名稱*/@Column(name = "name")private String name;/*** 年齡*/@Column(name = "age")private Integer age;/*** 身份編號*/@Column(name = "card_no")private Integer cardNo;/*** 生日*/@Column(name = "birthday")private Date birthday; }

本地通用Mapper接口（繼承通用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、刪、改、查方法
MySqlMapper：針對MySQL的額外補充接口，支持批量插入

業務接口（繼承“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啟動類，@MapperScan僅掃描業務接口包，不能掃描本地通用Mapper接口包，否則報java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class異常

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);}}

通過使用@MapperScan可以指定要掃描的Mapper類的包的路徑，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); } }

可以根據包的結構指定不同的表達式。

使用@MapperScan注解多個包

可以使用如下的方式指定多個包：

@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類沒有在Spring Boot主程序可以掃描的包或者子包下面，可以使用如下方式進行配置：

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

單元測試

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;// 插入一條新記錄@Testpublic void insertOne() {User newUser = new User();int cardNo = (int) (Math.random() * 10000000);newUser.setAge(24);newUser.setBirthday(new Date());newUser.setName(cardNo + "用戶");newUser.setCardNo(cardNo);mapper.insertSelective(newUser);System.out.println("插入成功");}// 批量插入記錄@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 + "批量插入用戶");newUser.setCardNo(cardNo);recordList.add(newUser);}mapper.insertList(recordList);System.out.println("批量插入成功");}// 根據唯一編號查詢用戶(通用Mapper查詢)@Testpublic void selectByCardNo() {User paramBean = new User();paramBean.setCardNo(6647403);User dbUser = mapper.selectOne(paramBean);if (dbUser != null) {System.out.println("數據庫用戶(通用Mapper查詢)：" + dbUser.getName());return;}System.out.println("查無此用戶");}// 根據唯一編號查詢用戶(XML查詢)@Testpublic void selectByCardNoByXml() {User dbUser = mapper.selectByCardNo(6105967);if (dbUser != null) {System.out.println("數據庫用戶(XML查詢)：" + dbUser.getName());return;}System.out.println("查無此用戶");}// 根據年齡查詢一組用戶@Testpublic void selectByAge() {User paramBean = new User();paramBean.setAge(24);List<User> dbUserList = mapper.select(paramBean);System.out.println("總共查詢數：" + dbUserList.size());}// 分頁查詢用戶@Testpublic void selectByPage() {PageHelper.offsetPage(1, 5);List<User> dbUserList = mapper.select(null);for (User item : dbUserList) {System.out.println("分頁用戶：" + item.getName());}}// 更新用戶信息@Testpublic void updateOneInfo() {User paramBean = new User();paramBean.setId(1);paramBean.setAge(26);mapper.updateByPrimaryKeySelective(paramBean);System.out.println("更新成功");}}

事務的使用

spring Boot 使用事務非常簡單，首先使用注解 @EnableTransactionManagement開啟事務支持后，然后在訪問數據庫的Service方法上添加注解 @Transactional 便可。

@EnableTransactionManagement放在啟動類上

總結

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