SpringBoot和Mybatis的整合
2018-07-30 14:52
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以前用Spring构建一个项目，配置文件太过麻烦而且很容易出错，而用SpringBoot，只需要填写必要的配置文件，可以很轻松整合Mybatis。下面开启SpringBoot之旅吧!
1、pom.xml引入相关依赖
[code]<?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.jlu</groupId> <artifactId>springboot_mybatis</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot_mybatis</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.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>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!--引入druid--> <!-- https://mvnrepository.com/artifact/com.alibaba/druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.8</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>net.minidev</groupId> <artifactId>json-smart</artifactId> <version>2.2.1</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2、使用yaml配置文件比XML更加简洁明了。application.yml
[code]spring: datasource: # 数据源基本配置 username: root password: 123456 driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://192.168.0.113:3306/mybatis type: com.alibaba.druid.pool.DruidDataSource # 数据源其他配置 initialSize: 5 minIdle: 5 maxActive: 20 maxWait: 60000 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 validationQuery: SELECT 1 FROM DUAL testWhileIdle: true testOnBorrow: false testOnReturn: false poolPreparedStatements: true # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙 filters: stat,wall,log4j maxPoolPreparedStatementPerConnectionSize: 20 useGlobalDataSourceStat: true connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500 #建表时用 # schema: # - classpath:sql/department.sql # - classpath:sql/employee.sql #-----以下是xml配置文件方式开发------------- mybatis: # 指定全局配置文件位置 config-location: classpath:mybatis/mybatis-config.xml # 指定sql映射文件位置 mapper-locations: classpath:mybatis/mapper/*.xml
如果想要自动建表，可在要第一次运行前将schema打开，建表sql放到指定路径下
3、实体类:Department(注解版测试用)和Employee(注解+XML配置版测试用)
[code]public class Department {
private Integer id;
private String departmentName;
//getters sttters toString...
}
[code]public class Employee {
private Integer id;
private String lastName;
private Integer gender;
private String email;
private Integer dId;
//getters setters toString...
}
4、整合Druid数据源
[code]@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druid() {
return new DruidDataSource();
}
//配置Druid的监控
//1、配置一个管理后台的Servlet
@Bean
public ServletRegistrationBean statViewServlet() {
ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
Map<String, String> initParams = new HashMap<>();
initParams.put("loginUsername", "admin");
initParams.put("loginPassword", "123456");
initParams.put("allow", "");//默认就是允许所有访问
initParams.put("deny", "192.168.0.113");
bean.setInitParameters(initParams);
return bean;
}
//2、配置一个web监控的filter
@Bean
public FilterRegistrationBean webStatFilter() {
FilterRegistrationBean bean = new FilterRegistrationBean();
bean.setFilter(new WebStatFilter());
Map<String, String> initParams = new HashMap<>();
initParams.put("exclusions", "*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
5、实体类对应的Mapper
DepartmentMapper:
[code]//@Mapper指定这是一个操作数据库的mapper
//@Mapper
public interface DepartmentMapper {
@Select("select * from department where id=#{id}")
public Department getDeptById(Integer id);
@Delete("delete from department where id=#{id}")
public int deleteDeptById(Integer id);
//useGeneratedKeys：开启自增主键，keyProperty：Department中哪个属性与主键映射
@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(department_name) values(#{departmentName})")
public int insertDept(Department department);
@Update("update department set department_name=#{departmentName} where id=#{id}")
public int updateDept(Department department);
}
EmplyeeMapper:
[code]//@Mapper或者@MapperScan将接口扫描装配到容器中
public interface EmployeeMapper {
public Employee getEmpById(Integer id);
public void insertEmp(Employee employee);
}
注意mapper接口中如果不标明@Mapper，也可在主程序类里用@MapperScan注解扫描包
[code]//使用MapperScan批量扫描所有的Mapper接口；
@MapperScan(value = "com.jlu.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBoot06DataMybatisApplication.class, args);
}
}
第①方式：全注解版
1、编写controller：
[code]@RestController
public class DeptController {
@Autowired
DepartmentMapper departmentMapper;
//根据id查询部门信息
@GetMapping("/dept/{id}")
public Department getDepartment(@PathVariable("id") Integer id){
return departmentMapper.getDeptById(id);
}
//插入数据，并返回部门信息
@GetMapping("/dept")
public Department insertDept(Department department){
departmentMapper.insertDept(department);
return department;
}
}
2、mapper接口
[code]//@Mapper指定这是一个操作数据库的mapper
//@Mapper
public interface DepartmentMapper {
@Select("select * from department where id=#{id}")
public Department getDeptById(Integer id);
@Delete("delete from department where id=#{id}")
public int deleteDeptById(Integer id);
//useGeneratedKeys：开启自增主键，keyProperty：Department中哪个属性与主键映射
@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(department_name) values(#{departmentName})")
public int insertDept(Department department);
@Update("update department set department_name=#{departmentName} where id=#{id}")
public int updateDept(Department department);
}
3、启动和测试：
访问http://localhost:8080/dept?departmentName=研发部（其中id是自增长，mapper中用@Options注解标明），向数据库插入一条数据
页面返回数据：{"id":1,"departmentName":"研发部"}
访问http://localhost:8080/dept/1，查询id为1的数据---{"id":1,"departmentName":"研发部"}
问题：
当实体类属性departmentName和表字段depaartment_name不一致时，访问http://localhost:8080/dept/1（返回的jsons数据{"id":1,"departmentName":NULL}）。由于用全注解版，不能用XML配置开启驼峰命名规则，我们有2中办法解决这问题。
其一可以用@Results注解指定映射关系如下：
[code] @Results({
@Result(property = "departmentName", column = "department_name")
})
@Select("select * from department where id=#{id}")
public Department getDeptById(Integer id);
其二我们可以编写一个自定义MyBatis的配置规则配置类；给容器中添加一个ConfigurationCustomizer；开启驼峰命名规则
（值得注意的是如果application.yml中引入了配置文件这个就没用了？）
[code]@org.springframework.context.annotation.Configuration
public class MyBatisConfig {
@Bean
public ConfigurationCustomizer configurationCustomizer() {
return new ConfigurationCustomizer() {
@Override
public void customize(Configuration configuration) {
//全局开启驼峰命名规则
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}
第②种方式：XML
1、controller
[code]@RestController
public class DeptController {
@Autowired
EmployeeMapper employeeMapper;
//数据插入略...
//根据id查询雇员信息
@GetMapping("/emp/{id}")
public Employee getEmp(@PathVariable("id") Integer id){
return employeeMapper.getEmpById(id);
}
}
2、mapper接口：
[code]//@Mapper或者@MapperScan将接口扫描装配到容器中
public interface EmployeeMapper {
public Employee getEmpById(Integer id);
public void insertEmp(Employee employee);
}
3、SQL映射文件和mapper全局配置文件
类路径下/mybaties/mapper/Employeemapper.xml
[code]<?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.jlu.springboot.mapper.EmployeeMapper">
<select id="getEmpById" resultType="com.jlu.springboot.bean.Employee">
SELECT * FROM employee WHERE id=#{id}
</select>
<insert id="insertEmp">
INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lastName},#{email},#{gender},#{dId})
</insert>
</mapper>
类路径下/mybaties/mybatis-config.xml
[code]<?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> <!--mybatis开启驼峰映射规则，数据库字段自动映射为实体类属性--> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> </configuration>
4、在application.yml在全局配置文件中
5、启动和测试
访问http://localhost:8080/emp/1，查询id为1的数据
{"id":1,"lastName":"zhangSan",gender:0,email:"aaaa@163.com",dId:1}
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