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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 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springboot项目springboot-jdbcTemplate
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>
完成的pom依赖信息
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
配置相关文件
在application.yml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
data-username: root
data-password: 123456
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
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;
/**
* <pre>
*
* @auther: cao_wencao
* @date: 2019/2/20 13:34
* </pre>
*/
@Data
@ToString
@AllArgsConstructor
public class Account {
private int id ;
private String name ;
private double money;
}
dao层
public interface IAccountDAO {
int add(Account account);
int update(Account account);
int delete(int id);
Account findAccountById(int id);
List<Account> findAccountList();
}
实现类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;
/**
* <pre>
*
* @auther: cao_wencao
* @date: 2019/2/20 15:45
* </pre>
*/
@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();
}
实现类Impl：
@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
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;
/**
* <pre>
*
* @auther: cao_wencao
* @date: 2019/2/20 15:50
* </pre>
*/
@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。