springboot学习入门简易版八---springboot2.0多环境配置整合mybatis mysql8+（19-20)

Posted 2021-11-29 cslj2013

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了springboot学习入门简易版八---springboot2.0多环境配置整合mybatis mysql8+（19-20)相关的知识，希望对你有一定的参考价值。

2.11 SpringBoot多环境配置（19）

application.properties中配置

Spring.profiles.active=prd

配置环境：

Application-dev.properties 开发环境

Application-test.properties 测试环境

Application-uat.properties 用户测试环境

Application-prd.properties 生产环境

2.12 SpringBoot整合mybatis（20）

注意：使用springboot2和mysql8+(8.0.11)，jdk8+(jdk8)

配置和之前版本有所不同

项目结构：

技术图片

从上到下依次创建

2.12.1 实体对象

public class Employee implements Serializable{
    private static final long serialVersionUID = 1L;
    private Integer id;
    private String lastName;
省略get/set

2.12.2 controller

@RestController
@RequestMapping("/employee")
public class EmployeeController {
    @Resource
    EmployeeService employeeService;
    
    @RequestMapping("/insert")
    public String insert(String lastName){
        Employee emp=new Employee();
        emp.setLastName(lastName);
        int i=employeeService.insert(emp);
        return i+"";
    }
}

2.12.3 service

@Service
public class EmployeeService {
    @Resource
    EmployeeDao employeeDao;
    
    public Integer insert(Employee emp) {
        return employeeDao.insert(emp);
    }
}

省去了接口类写法，直接写service类

2.12.4 dao

public interface EmployeeDao {

    int insert(Employee emp);
    
}

2.12.5 mapping

<?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.springboot2.dao.EmployeeDao">
  <insert id="insert" parameterType="com.springboot2.bean.Employee">
    insert into myemployeee(last_name) values (#{lastName,jdbcType=VARCHAR})
  </insert>
</mapper>

注意：mapping和dao不在同一个包下，配置时通过

mapper-locations: classpath:com/springboot2/mapping/*.xml

扫描xml文件

2.12.6 application配置文件

mybatis:
  mapper-locations: classpath:com/springboot2/mapping/*.xml
  
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/mytest?useSSL=false&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&serverTimezone=GMT%2B8&allowMultiQueries=true
    username: root
    password: (****)
    driver-class-name: com.mysql.cj.jdbc.Driver

注意：

1）url连接与之前版本有所不同，如添加serverTimezone时区，useSSL

2）Url中有时报错，可能是&不识别，需要转为&但有时&也会报错，改为&再尝试。本例即改为&不报错。

3）Jdbc驱动变动为com.mysql.cj.jdbc.Driver，之前为com.mysql.jdbc.Driver

https://blog.csdn.net/qq_22076345/article/details/81952035

2.12.7 启动类

@SpringBootApplication
@MapperScan("com.springboot2.dao")
public class StartApplication {

    public static void main(String[] args) {
        SpringApplication.run(StartApplication.class, args);
    }

}

2.12.8 pom文件

<parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
     <version>2.0.9.RELEASE</version>
 </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-web</artifactId>
     </dependency>
     <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
        <!-- mysql 驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
        </dependency>
     </dependencies>

如果不需要start-web，仅使用mybatis-spring-boot-starter和mysql-connector-java即可。