SpringBoot与MyBatis整合

(1)首先使用spring Initializr快速创建一个项目，勾选web，mysql，jdbc,mybatis模块。

(2)在application.properties中:

server.port=8082

#配置数据源相关参数
spring.datasource.url=jdbc:mysql://localhost:3306/egobuy?characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#切换数据源类型为Druid
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

#Druid连接池的特有属性
spring.datasource.maxActive=20 //最大约束
spring.datasource.minIdle=8//
spring.datasource.initialSize=5//初始化数量

(3)将com....config.DataSourceConfig复制到包下:

package com.szhhome.springbootmybatis.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DataSourceConfig {

    //跟spring.datasource相关的对象属性跟配置文件进行绑定
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean//返回的对象交给spring容器管理
    public DruidDataSource dataSource(){
        return new DruidDataSource();
    }

}

(3)在Dao层采用基于注解的形式开发:

package com.szhhome.springbootmybatis.mapper;

import com.szhhome.springbootmybatis.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper//声明这个接口是一个mapper接口，需要生成mapper代理对象
public interface UserMapper {

    @Select("select * from tb_user")
    public List<User> selectUsers();

    @Select("select * from tb_user where id=#{id}")
    public User selectUserById(Long id);
}

（4）pojo,service,controller省略不写,在pojo中可以指定日期的数据类型格式:

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date created;

(5)配置mapper扫描器:

@SpringBootApplication
@MapperScan(basePackages = {"com.szhhome.springbootmybatis.mapper"})
public class SpringbootMybatisApplication {

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

}

(6)启动项目测试

拓展：基于配置文件开发

来源：CSDN

作者：szhwwjava

链接：https://blog.csdn.net/qq_39182939/article/details/104575846

标签

select

MyBatis

mapper