SpringBoot+Mybatis+druid整合详细过程,这里使用的是druid连接池(亦可以使用hikari连接池,参考SpringBoot整合hikari),具体参数配置请参考我的上一篇博客SpringBoot整合druid
欢迎大家访问 我的Hexo博客
项目准备
首先新建一个SpringBoot的web项目,选择Spring Initializr(用来初始化一个Spring boot 的项目)
然后填写项目坐标,自行修改
最后选择要添加的组件web,Mybatis,mysql新建成功
配置
打开pom.xml文件
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<!--添加druid依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.16</version>
</dependency>
<!--导入log4j,因为driud添加的拓展插件为log4j-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!--mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
打开配置文件application.yml添加具体属性
========================
#数据源基本配置
spring:
datasource:
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver# 时区配置错误就添加 serverTimezone = UTC
url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC
#druid增加的配置
type: com.alibaba.druid.pool.DruidDataSource
=========================以下配置酌情处理===========
# 初始化连接池个数
initialSize: 5
# 最小连接池个数
minIdle: 5
# 最大连接池个数
max-active: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测
timeBetweenEvictionRunsMillis: 60000
# 最小生存的时间
minEvictableIdleTimeMillis: 300000
# 用来检测连接是否有效的sql,要求是一个查询语句。
# 如果validationQuery为null,testOnBorrow、testOnReturn、testWhileIdle都不会起作用
validationQuery: SELECT 1 FROM DUAL
# 建议配置为true,不影响性能,并且保证安全性。
# 申请连接的时候检测,如果空闲时间大于timeBetweenEvictionRunsMillis,执行validationQuery检测连接是否有效。
testWhileIdle: true
# 申请连接时执行validationQuery检测连接是否有效,做了这个配置会降低性能
testOnBorrow: false
# 归还连接时执行validationQuery检测连接是否有效,做了这个配置会降低性能
testOnReturn: false
# 打开PSCache,并且指定每个连接上PSCache的大小
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
# 通过别名的方式配置扩展插件,多个英文逗号分隔,常用的插件有:
# 监控统计用的filter:stat
# 日志用的filter:log4j
# 防御sql注入的filter:wall
filters: stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
useGlobalDataSourceStat: true
添加配置类MyBatisConfig开启驼峰命名
public class MybatisConfig {
@Bean
public ConfigurationCustomizer configurationCustomizer() {
return new ConfigurationCustomizer() {
@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true); //开启驼峰
}
};
}
}
添加实体类Department
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;
}
}
打开数据库管理工具新建名为mybatis的数据库,执行Department类对应sql脚本
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for department
-- ----------------------------
DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`department_name` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
添加接口DepartmentMapper,使用注解增删改查,这里只演示insert和select
public interface DepartmentMapper {
@Select("select * from department where id=#{id}")
Department getDeptById(Integer id);
//使用自动生成的主键,并告诉是那个属性是封装主键的
@Options(useGeneratedKeys = true, keyProperty = "id")
@Insert("insert into department(department_name) values(#{departmentName})")
int insertDept(Department department);
}
在启动类上添加@MapperScan扫描mapper包
@MapperScan(value = "com.springboot.mapper")
@SpringBootApplication
public class SpringBootDataMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootDataMybatisApplication.class, args);
}
}
添加DeptController类
@RestController
public class DeptController {
@Autowired
private DepartmentMapper departmentMapper;
@GetMapping("/dept/{id}")
public Department getDepartment(@PathVariable("id") Integer id) {
return departmentMapper.getDeptById(id);
}
@GetMapping("/insert")
public Department insertDept(Department department) {
departmentMapper.insertDept(department);
return department;
}
}
启动项目,在浏览器输入localhost:8080/insert?departmentName=huawei,新增数据成功
然后再输入localhost:8080/dept/1,获取departmentName=huawei的数据
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