SpringBoot用JdbcTemplates访问Mysql实例代码

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

1. jdk 1.8
2. maven 3.0
3. idea
4. mysql

初始化mysql:

-- 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');

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.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.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.
 */
@Repository
public 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：

@Service
public 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

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