目录

1、配置pom.xml

2、配置application.yml

3、配置DruidConfig关联yml的配置文件spring.datasource

4、创建数据库及数据库表结构

5、创建对应的实体类

1）Department

2）Employee

6、创建对应的Mapper

1)创建DepartmentMapper

7、创建DeptController

8、浏览器访问

1）新增测试：

返回结果

2）查询测试：

返回结果

9、解决驼峰命名问题

1）使用配置类的方式

2）使用配置文件的方式

10、省写@Mapper 注解，统一配置在启动入口

11、配置文件的方式整合Mybatis

1）创建EmployeeMapper类

2）创建mybatis/mapper/EmployeeMapper.xml

3)创建mybatis/mybatis-config.xml

4) 在application.yml文件中配置mybatis文件的位置

5）创建EmpController类

6）测试配置版springboot整合mybatis

1、配置pom.xml

<?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><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.6.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.mi</groupId><artifactId>spring-boot-mybatis</artifactId><version>0.0.1-SNAPSHOT</version><name>spring-boot-mybatis</name><description>spring-boot-mybatis project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.0.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!--引入自定义数据源--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.18</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

2、配置application.yml

spring:datasource:username: rootpassword: rooturl: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTCdriver-class-name: com.mysql.jdbc.Drivertype: com.alibaba.druid.pool.DruidDataSourceinitialSize: 5minIdle: 5maxActive: 20maxWait: 60000timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: SELECT 1 FROM DUALtestWhileIdle: truetestOnBorrow: falsetestOnReturn: falsepoolPreparedStatements: 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,log4jmaxPoolPreparedStatementPerConnectionSize: 20useGlobalDataSourceStat: trueconnectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500schema:- classpath:sql/department.sql- classpath:sql/employee.sql

3、配置DruidConfig关联yml的配置文件spring.datasource

package com.mi.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;/*** Created by chengwen on 2019/7/3.*/
@Configuration
public class DruidConfig {@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource druid(){return new DruidDataSource();}//配置Druid的监控//1、配置一个管理后台的servlet@Beanpublic ServletRegistrationBean statViewServlet(){ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");Map<String,String> initParms = new HashMap<>();initParms.put("loginUsername","admin");initParms.put("loginPassword","123456");initParms.put("allow",""); //默认是允许所有访问initParms.put("deny","192.168.15.21"); //不允许访问bean.setInitParameters(initParms);return bean;}//2、配置一个监控的filter@Beanpublic FilterRegistrationBean webStatFilter(){FilterRegistrationBean bean = new FilterRegistrationBean();bean.setFilter(new WebStatFilter());Map<String,String> initParms = new HashMap<>();initParms.put("exclusions","*.js,*.css,/druid/*");bean.setInitParameters(initParms);bean.setUrlPatterns(Arrays.asList("/*"));return bean;}
}

4、创建数据库及数据库表结构

SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for department
-- ----------------------------
DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (`id` int(11) NOT NULL AUTO_INCREMENT,`departmentName` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;SET FOREIGN_KEY_CHECKS=0;-- ----------------------------
-- Table structure for employee
-- ----------------------------
DROP TABLE IF EXISTS `employee`;
CREATE TABLE `employee` (`id` int(11) NOT NULL AUTO_INCREMENT,`lastName` varchar(255) DEFAULT NULL,`email` varchar(255) DEFAULT NULL,`gender` int(2) DEFAULT NULL,`d_id` int(11) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

5、创建对应的实体类
1）Department

package com.mi.bean;
/*** Created by chengwen on 2019/7/3.*/
public class Department {private  Integer id;private String departmentName;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getDepartmentName() {return departmentName;}public void setDepartmentName(String departmentName) {this.departmentName = departmentName;}
}

2）Employee

package com.mi.bean;/*** Created by chengwen on 2019/7/3.*/
public class Employee {private Integer id;private String lastName;private Integer gender;private String email;private Integer dId;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getLastName() {return lastName;}public void setLastName(String lastName) {this.lastName = lastName;}public Integer getGender() {return gender;}public void setGender(Integer gender) {this.gender = gender;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public Integer getdId() {return dId;}public void setdId(Integer dId) {this.dId = dId;}
}

6、创建对应的Mapper
1)创建DepartmentMapper

package com.mi.mapper;
import com.mi.bean.Department;
import org.apache.ibatis.annotations.*;/*** Created by chengwen on 2019/7/3.*/
//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);//@Options注解用于获取自增主键返回给前端@Options(useGeneratedKeys = true,keyProperty = "id")@Options(useGeneratedKeys = true,keyProperty = "id")@Insert("insert into department(departmentName) values (#{departmentName})")public int insertDept(Department department);@Update("update department set departmentName=#{departmentName} where id=#{id}")public int updateDept(Department department);}

7、创建DeptController

package com.mi.controller;import com.mi.bean.Department;
import com.mi.mapper.DepartmentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;/*** Created by chengwen on 2019/7/3.*/
@RestController
public class DeptController {@AutowiredDepartmentMapper departmentMapper;@GetMapping("dept/{id}")public Department getDepartment(@PathVariable("id") Integer id){return departmentMapper.getDeptById(id);}@GetMapping("dept")public Department insertDept(Department department){departmentMapper.insertDept(department);return department;}
}

8、浏览器访问
1）新增测试：

http://localhost:8080/dept?departmentName=CC

返回结果

{"id":3,"departmentName":"CC"}

2）查询测试：

http://localhost:8080/dept/1

返回结果

{"id":1,"departmentName":"AA"}

9、解决驼峰命名问题

可以使实体类的驼峰命名与数据库的下划线映射成功。

1）使用配置类的方式

package com.mi.config;
import org.apache.ibatis.session.Configuration;
import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;
import org.springframework.context.annotation.Bean;/*** Created by chengwen on 2019/7/3.*/
@org.springframework.context.annotation.Configuration
public class MyBatisConfig {@Beanpublic ConfigurationCustomizer configurationCustomizer(){return new ConfigurationCustomizer() {@Overridepublic void customize(Configuration configuration){configuration.setMapUnderscoreToCamelCase(true);}};}
}

2）使用配置文件的方式

在application.yml文件中添加配置

# 解决驼峰命名问题
mybatis:configuration:map-underscore-to-camel-case: true

10、省写@Mapper 注解，统一配置在启动入口

使用@MapperScan(value = "com.mi.mapper")扫描所有Mapper文件

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

11、配置文件的方式整合Mybatis
1）创建EmployeeMapper类

package com.mi.mapper;
import com.mi.bean.Employee;
import org.apache.ibatis.annotations.Mapper;/*** Created by chengwen on 2019/7/3.*/
//@Mapper或者mapperScan将接口扫描到容器中
public interface EmployeeMapper {public Employee getEmpById(Integer id);public void insertEmp(Employee employee);
}

2）创建mybatis/mapper/EmployeeMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mi.mapper.EmployeeMapper"><select id="getEmpById" resultType="com.mi.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>

3)创建mybatis/mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><settings><setting name="mapUnderscoreToCamelCase" value="true"/></settings>
</configuration>

4) 在application.yml文件中配置mybatis文件的位置

spring:datasource:username: rootpassword: rooturl: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTCdriver-class-name: com.mysql.jdbc.Drivertype: com.alibaba.druid.pool.DruidDataSourceinitialSize: 5minIdle: 5maxActive: 20maxWait: 60000timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: SELECT 1 FROM DUALtestWhileIdle: truetestOnBorrow: falsetestOnReturn: falsepoolPreparedStatements: 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,log4jmaxPoolPreparedStatementPerConnectionSize: 20useGlobalDataSourceStat: trueconnectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500#schema:#  - classpath:sql/department.sql#  - classpath:sql/employee.sql
# 解决驼峰命名问题
mybatis:#configuration:#  map-underscore-to-camel-case: true#配置文件的方式整合mybatisconfig-location: classpath:/mybatis/mybatis-config.xmlmapper-locations: classpath:/mybatis/mapper/*.xml

5）创建EmpController类

package com.mi.controller;
import com.mi.bean.Employee;
import com.mi.mapper.EmployeeMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;/*** Created by chengwen on 2019/7/3.*/
@RestController
public class EmpController {@AutowiredEmployeeMapper employeeMapper;@GetMapping("emp/{id}")public Employee getEmp(@PathVariable("id") Integer id){return employeeMapper.getEmpById(id);}}

6）测试配置版springboot整合mybatis

http://localhost:8080/emp/1

测试结果

{"id":1,"lastName":"zhangsan","gender":1,"email":"zhangsan@163.com","dId":1}

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