6_3.springboot2.x数据整合Mybatis(注解和非注解)
1、配置文件
pom.xml
导入mybatis提供的启动器
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.0</version>
</dependency>
application.yml
spring:
datasource:
username: root
password: 123456
url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT
driver-class-name: com.mysql.cj.jdbc.Driver
initialization-mode: always
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=500Druid数据源配置：
package com.spboot.springboot.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;
@Configuration
public class DruidConfig {
@ConfigurationProperties("spring.datasource")
@Bean
public DataSource druid(){
return new DruidDataSource();
}
//配置Druid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<String ,String >();
initParams.put("loginUsername","admin");
initParams.put("loginPassword","123456");
initParams.put("allow","");//默认允许所有
initParams.put("deny","192.168.1.1");
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<String ,String >();
initParams.put("exclusions","*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
2、注解版
1、pojo类
package com.spboot.springboot.pojo;
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) {
DepartmentName = departmentName;
}
}
2、新建Mybatis配置类
自定义MyBatis的配置规则；给容器中添加一个ConfigurationCustomizer
package com.spboot.springboot.config;
import org.apache.ibatis.session.Configuration;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;
import org.springframework.context.annotation.Bean;
@MapperScan(value = "com.spboot.springboot.mapper")
@org.springframework.context.annotation.Configuration
public class MybatisConfig {
@Bean
public ConfigurationCustomizer configurationCustomizer() {
return new ConfigurationCustomizer() {
@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}如果使用@MapperScan(value = "com.spboot.springboot.mapper")注解，则会扫描mapper包下的所有mapper接口，也可以单独在mapper接口类中一一配置。
3、mapper接口
package com.spboot.springboot.mapper;
import com.spboot.springboot.pojo.Department;
import org.apache.ibatis.annotations.*;
//告诉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 deleteDepartmentById(Integer id);
@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(department_name) values(#{department_name})")
public int insertDepart(Department department);
@Update("update department set department_name=#{department_name} where id=#{id}")
public int updateDept(Department department);
}
4、controller
@RestController
public class controller {
@Autowired
DepartmentMapper mapper;
@RequestMapping("/dept/{id}")
public Department getDepartment(@PathVariable("id") Integer id){
return mapper.getDeptById(id);
}
@RequestMapping("/dept")
public Department insertDepartment(Department department){
mapper.insertDepart(department);
return department;
}
}测试：
3、配置文件版
1、pojo
package com.spboot.springboot.pojo;
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;
}
}
2、mapper接口
package com.spboot.springboot.mapper;
import com.spboot.springboot.pojo.Employee;
//将接口扫描到容器中 @mapper
public interface EmployeeMapper {
public Employee getEmpById(Integer id);
public void insertEmpty(Employee employee);
}
3、mybatis-config.xml
<?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>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>
<setting name="mapUnderscoreToCamelCase" value="true"/>启用从数据库列名A_COLUMN到驼峰式经典Java属性名aColumn的自动映射
4、EmployeeMapper.xml
mapper映射文件
<?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.spboot.springboot.mapper.EmployeeMapper">
<select id="getEmpById" resultType="com.spboot.springboot.pojo.Employee">
SELECT * FROM employee WHERE id = #{ID}
</select>
<insert id="insertEmpty">
INSERT Into employee (lastName,email,gender,d_id) values (#{lastName},#{email},#{gender},#{d_id})
</insert>
</mapper>
注意关键一步：在application.yml加载mybaits配置文件包括（mybatis-config.xml和*Mapper.xml）
5、controller
@Autowired
EmployeeMapper employeeMapper;
@RequestMapping("/emp/{id}")
public Employee getEmp(@PathVariable("id") Integer id){
return employeeMapper.getEmpById(id);
}
测试：
ok 完成！
