SpringBoot用JdbcTemplates访问Mysql实例代码

时间:2021-05-20

本文介绍springboot通过jdbc访问关系型MySQL,通过spring的JdbcTemplate去访问。

准备工作

  • jdk 1.8
  • maven 3.0
  • idea
  • mysql
  • 初始化mysql:

    -- create table `account`DROP TABLE `account` IF EXISTSCREATE 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');

    创建工程

    引入依赖:

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

    <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency>

    引入mysql连接类和连接池:

    <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>

    开启web:

    <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>

    配置相关文件

    在application.properties文件配置mysql的驱动类,数据库地址,数据库账号、密码信息。

    spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/testspring.datasource.username=rootspring.datasource.password=123456

    通过引入这些依赖和配置一些基本信息,springboot就可以访问数据库类。

    具体编码

    实体类

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

    dao层

    public interface IAccountDAO { int add(Account account); int update(Account account); int delete(int id); Account findAccountById(int id); List<Account> findAccountList();}

    具体的实现类:

    package com.forezp.dao.impl;import com.forezp.dao.IAccountDAO;import com.forezp.entity.Account;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.stereotype.Repository;import java.util.List;/** * Created by fangzhipeng on 2017/4/20. */@Repositorypublic class AccountDaoImpl implements IAccountDAO { @Autowired private JdbcTemplate jdbcTemplate; @Override public int add(Account account) { return jdbcTemplate.update("insert into account(name, money) values(?, ?)", account.getName(),account.getMoney()); } @Override public int update(Account account) { return jdbcTemplate.update("UPDATE account SET NAME=? ,money=? WHERE id=?", account.getName(),account.getMoney(),account.getId()); } @Override public int delete(int id) { return jdbcTemplate.update("DELETE from TABLE account where id=?",id); } @Override public Account findAccountById(int id) { List<Account> list = jdbcTemplate.query("select * from account where id = ?", new Object[]{id}, new BeanPropertyRowMapper(Account.class)); if(list!=null && list.size()>0){ Account account = list.get(0); return account; }else{ return null; } } @Override public List<Account> findAccountList() { List<Account> list = jdbcTemplate.query("select * from account", new Object[]{}, new BeanPropertyRowMapper(Account.class)); if(list!=null && list.size()>0){ return list; }else{ return null; } }}

    service层

    public interface IAccountService { int add(Account account); int update(Account account); int delete(int id); Account findAccountById(int id); List<Account> findAccountList();}

    具体实现类:

    @Servicepublic class AccountService implements IAccountService { @Autowired IAccountDAO accountDAO; @Override public int add(Account account) { return accountDAO.add(account); } @Override public int update(Account account) { return accountDAO.update(account); } @Override public int delete(int id) { return accountDAO.delete(id); } @Override public Account findAccountById(int id) { return accountDAO.findAccountById(id); } @Override public List<Account> findAccountList() { return accountDAO.findAccountList(); }}

    构建一组restful api来展示

    package com.forezp.web;import com.forezp.entity.Account;import com.forezp.service.IAccountService;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 IAccountService 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.findAccountById(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){ Account account=new Account(); account.setMoney(money); account.setName(name); account.setId(id); int t=accountService.update(account); if(t==1){ return account.toString(); }else { return "fail"; } } @RequestMapping(value = "",method = RequestMethod.POST) public String postAccount( @RequestParam(value = "name")String name, @RequestParam(value = "money" )double money){ Account account=new Account(); account.setMoney(money); account.setName(name); int t= accountService.add(account); if(t==1){ return account.toString(); }else { return "fail"; } }}

    可以通过postman来测试,具体的我已经全部测试通过,没有任何问题。注意restful构建api的风格。

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

    以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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