springBoot整合Mybatis
1.映入starter依赖
代码如下：
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.1
本项目的pom.xml文件
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.6.RELEASE
com.example
springboot-mybatis
0.0.1-SNAPSHOT
springboot-mybatis
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-jdbc
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.1
com.alibaba
druid
1.1.18
log4j
log4j
1.2.17
mysql
mysql-connector-java
runtime
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-maven-plugin
2.使用阿里的druid数据源
2.1 导入druid的依赖
代码如下：
com.alibaba
druid
1.1.18
2.2 在application.xml或者application.yml中配置druid数据源属性
application.yml
spring:
datasource:
# 数据源基本配置
username: root
password: 12345645
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
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
#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
# schema:
# - classpath:sql/department.sql
# - classpath:sql/employee.sql
注意
在url中一定要加入？后面的配置
代码如下：
url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
2.3 编写druid数据源的配置类
代码如下：
package com.example.springbootmybatis.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(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 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","127.0.0.1");
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 initParams = new HashMap<>();
initParams.put("exclusions","*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
3.操作MyBatis
3.1 注解版
3.1.1 Mapper接口
代码如下：
package com.example.springbootmybatis.mapper;
import com.example.springbootmybatis.bean.Department;
import org.apache.ibatis.annotations.*;
//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(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);
}
3.1.2 测试
代码如下：
package com.example.springbootmybatis.controller;
import com.example.springbootmybatis.bean.Department;
import com.example.springbootmybatis.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;
/**
* create by
*
* @Author luozhiyuan
* @qq [email protected]
* @on 2019-07-05.
* @time 13:55
*/
@RestController
public class DeptController {
@Autowired
private DepartmentMapper 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;
}
}
结果：
3.1.3 设置自动生成主键
代码如下：
@Options(useGeneratedKeys = true,keyProperty = "id")
3.1.4 设置驼峰规则
代码如下：
package com.example.springbootmybatis.config;
import org.apache.ibatis.session.Configuration;
import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;
import org.springframework.context.annotation.Bean;
/**
* create by
*
* @Author luozhiyuan
* @qq [email protected]
* @on 2019-07-05.
* @time 14:39
*/
@org.springframework.context.annotation.Configuration
public class MyBatisConfig {
@Bean
public ConfigurationCustomizer configurationCustomizer(){
return new ConfigurationCustomizer() {
@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}
3.1.5 Mapper注解扫描
3.1.5.1 去掉Mapper接口的Mapper注解
3.1.5.2 在启动类上添加Mapper扫描注解
代码如下：
@MapperScan(value = "com.example.springbootmybatis.mapper")
3.2 XML配置版
3.2.1 Mapper接口
代码如下：
package com.example.springbootmybatis.mapper;
import com.example.springbootmybatis.bean.Employee;
//@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);
}
3.2.2 Mapper.xml文件
代码如下：
INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lastName},#{email},#{gender},#{dId})
3.2.3 在application.yml或者application.properties文件配置xml版的配置
代码如下：
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
3.2.4 设置驼峰规则
代码如下：