2023-02-20
原文作者:方志鹏 原文地址:https://blog.csdn.net/forezp/category_6830966.html

本文主要讲解如何在springboot下整合mybatis,并访问数据库。由于mybatis这个框架太过于流行,所以我就不讲解了。

引入依赖

在pom文件引入mybatis-spring-boot-starter的依赖:

           <dependency>
    			<groupId>org.mybatis.spring.boot</groupId>
    			<artifactId>mybatis-spring-boot-starter<artifactId>
    			<version>1.3.0</version>
    		</dependency>

引入数据库连接依赖:

    <dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<scope>runtime</scope>
    		</dependency>
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>druid</artifactId>
    			<version>1.0.29</version>
    		</dependency>

引入数据源

application.properties配置文件中引入数据源:

    spring.datasource.url=jdbc:mysql://localhost:3306/test
    spring.datasource.username=root
    spring.datasource.password=123456
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这样,springboot就可以访问数据了。

创建数据库表

建表语句:

    -- create table `account`
    # DROP TABLE `account` IF EXISTS
    CREATE TABLE `account` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `name` varchar(20) NOT NULL,
      `money` double DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
    INSERT INTO `account` VALUES ('1', 'aaa', '1000');
    INSERT INTO `account` VALUES ('2', 'bbb', '1000');
    INSERT INTO `account` VALUES ('3', 'ccc', '1000');

具体实现

这篇文篇通过注解的形式实现。

创建实体:

    public class Account {
       private int id ;
       private String name ;
       private double money;
       
     setter...
     getter...
    }

dao层

    @Mapper
    public interface AccountMapper {
    
        @Insert("insert into account(name, money) values(#{name}, #{money})")
        int add(@Param("name") String name, @Param("money") double money);
    
        @Update("update account set name = #{name}, money = #{money} where id = #{id}")
        int update(@Param("name") String name, @Param("money") double money, @Param("id") int  id);
    
        @Delete("delete from account where id = #{id}")
        int delete(int id);
    
        @Select("select id, name as name, money as money from account where id = #{id}")
        Account findAccount(@Param("id") int id);
    
        @Select("select id, name as name, money as money from account")
        List<Account> findAccountList();
    }

service层

    @Service
    public class AccountService {
        @Autowired
        private AccountMapper accountMapper;
    
        public int add(String name, double money) {
            return accountMapper.add(name, money);
        }
        public int update(String name, double money, int id) {
            return accountMapper.update(name, money, id);
        }
        public int delete(int id) {
            return accountMapper.delete(id);
        }
        public Account findAccount(int id) {
            return accountMapper.findAccount(id);
        }
        public List<Account> findAccountList() {
            return accountMapper.findAccountList();
        }
    }

controller层,构建restful API

    
    package com.forezp.web;
    
    import com.forezp.entity.Account;
    import com.forezp.service.AccountService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.*;
    
    import java.util.List;
    
    /**
     * Created by fangzhipeng on 2017/4/20.
     */
    @RestController
    @RequestMapping("/account")
    public class AccountController {
    
        @Autowired
        AccountService accountService;
    
        @RequestMapping(value = "/list", method = RequestMethod.GET)
        public List<Account> getAccounts() {
            return accountService.findAccountList();
        }
    
        @RequestMapping(value = "/{id}", method = RequestMethod.GET)
        public Account getAccountById(@PathVariable("id") int id) {
            return accountService.findAccount(id);
        }
    
        @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
        public String updateAccount(@PathVariable("id") int id, @RequestParam(value = "name", required = true) String name,
                                    @RequestParam(value = "money", required = true) double money) {
            int t= accountService.update(name,money,id);
            if(t==1) {
                return "success";
            }else {
                return "fail";
            }
    
        }
    
        @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
        public String delete(@PathVariable(value = "id")int id) {
            int t= accountService.delete(id);
            if(t==1) {
                return "success";
            }else {
                return "fail";
            }
    
        }
    
        @RequestMapping(value = "", method = RequestMethod.POST)
        public String postAccount(@RequestParam(value = "name") String name,
                                  @RequestParam(value = "money") double money) {
    
           int t= accountService.add(name,money);
           if(t==1) {
               return "success";
           }else {
               return "fail";
           }
    
        }
    
    
    }

通过postman测试通过。

源码下载:https://github.com/forezp/SpringBootLearning

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参考资料

mybatis

MyBatis整合

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