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

準備工作

• 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>

配置相關文件

在application.properties文件配置mysql的驅動類，數據庫地址，數據庫賬號、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就可以訪問數據庫類。

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 {@Autowiredprivate JdbcTemplate jdbcTemplate;@Overridepublic int add(Account account) {return jdbcTemplate.update("insert into account(name, money) values(?, ?)",account.getName(),account.getMoney());}@Overridepublic int update(Account account) {return jdbcTemplate.update("UPDATE account SET NAME=? ,money=? WHERE id=?",account.getName(),account.getMoney(),account.getId());}@Overridepublic int delete(int id) {return jdbcTemplate.update("DELETE from TABLE account where id=?",id);}@Overridepublic 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;}}@Overridepublic 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();}

具體實現類：

@Service public class AccountService implements IAccountService {@AutowiredIAccountDAO accountDAO;@Overridepublic int add(Account account) {return accountDAO.add(account);}@Overridepublic int update(Account account) {return accountDAO.update(account);}@Overridepublic int delete(int id) {return accountDAO.delete(id);}@Overridepublic Account findAccountById(int id) {return accountDAO.findAccountById(id);}@Overridepublic List<Account> findAccountList() {return accountDAO.findAccountList();} }

構建一組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 {@AutowiredIAccountService 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，具體的我已經全部測試通過，沒有任何問題。注意restful構建api的風格。

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