mybatis 3个月前

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：

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<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：

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<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：

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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：

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-- 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：

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

dao层

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@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

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@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

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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

参考资料

mybatis

MyBatis整合