java springcloud b2b2c shop 多用戶商城系統源碼（三）SpringBoot用JdbcTemplates訪問Mysql

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

Spring Cloud大型企業分佈式微服務雲構建的B2B2C電子商務平臺源碼請加企鵝求求：一零三八七七四六二六

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>

開啓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 {
 
    @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;
        }
    }
}

整體架構如下：

Spring Cloud大型企業分佈式微服務雲構建的B2B2C電子商務平臺源碼請加企鵝求求：一零三八七七四六二六

來源： java B2B2C 源碼 Springcloud多租戶電子商城系統