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
maven 3
idea/sts
mysql
初始化mysql:
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>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.url=jdbc:mysql://localhost:3306/test?zeroDateTimeBehavior=convertToNull&useUnicode=true&connectTimeout=5000&socketTimeout=5000&characterEncoding=UTF-8&useConfigs=maxPerformance&prepStmtCacheSqlLimit=1024 spring.datasource.username=root spring.datasource.password=root spring.datasource.driver-class-name=com.mysql.jdbc.Driver
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
package com.example.demo.domain;
public class Account {
private int id;
private String name;
private double money;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getMoney() {
return money;
}
public void setMoney(double money) {
this.money = money;
}
}
dao层
package com.example.demo.dao;
import java.util.List;
import com.example.demo.domain.Account;
public interface IAccountDAO {
int add(Account account);
int update(Account account);
int delete(int id);
Account findAccountById(int id);
List<Account> findAccountList();
}
dao具体的实现类：
package com.example.demo.dao.impl;
import java.util.List;
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 com.example.demo.dao.IAccountDAO;
import com.example.demo.domain.Account;
@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
package com.example.demo.service;
import java.util.List;
import com.example.demo.domain.Account;
public interface IAccountService {
int add(Account account);
int update(Account account);
int delete(int id);
Account findAccountById(int id);
List<Account> findAccountList();
}
package com.example.demo.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.example.demo.dao.IAccountDAO;
import com.example.demo.domain.Account;
import com.example.demo.service.IAccountService;
@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.example.demo.web;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.domain.Account;
import com.example.demo.service.IAccountService;
@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://gitee.com/zhmal/spring-boot-samples/tree/master/spring-boot-sample-jdbctemplate