SpringBoot用JdbcTemplates訪問Mysql實例代碼

發(fā)布時間：2020-08-21 18:00:31 來源：腳本之家閱讀：132 作者：方志朋欄目：編程語言

本文介紹springboot通過jdbc訪問關(guān)系型MySQL,通過spring的JdbcTemplate去訪問。

準(zhǔn)備工作

jdk 1.8
maven 3.0
idea
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');

創(chuàng)建工程

引入依賴：

在pom文件引入spring-boot-starter-jdbc的依賴：

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

引入mysql連接類和連接池：

<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>

開啟web:

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

配置相關(guān)文件

在application.properties文件配置mysql的驅(qū)動類，數(shù)據(jù)庫地址，數(shù)據(jù)庫賬號、密碼信息。

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

通過引入這些依賴和配置一些基本信息，springboot就可以訪問數(shù)據(jù)庫類。

具體編碼

實體類

public class Account {
  private int id ;
  private String name ;
  private double money;

....省略了getter. setter

}

dao層

public interface IAccountDAO {
  int add(Account account);

  int update(Account account);

  int delete(int id);

  Account findAccountById(int id);

  List<Account> findAccountList();
}

具體的實現(xiàn)類：

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層

public interface IAccountService {


  int add(Account account);

  int update(Account account);

  int delete(int id);

  Account findAccountById(int id);

  List<Account> findAccountList();

}

具體實現(xiàn)類：

@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();
  }
}

構(gòu)建一組restful api來展示

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";
    }

  }

}

可以通過postman來測試，具體的我已經(jīng)全部測試通過，沒有任何問題。注意restful構(gòu)建api的風(fēng)格。

源碼下載：https://github.com/forezp/SpringBootLearning

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持億速云。

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SpringBoot用JdbcTemplates訪問Mysql實例代碼

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