java版spring cloud+spring boot+redis多租户社交电子商务平台 （三）SpringBoot用JdbcTemplates访问Mysql

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');

创建工程

引入依赖：

在pom文件引入spring-boot-starter-jdbc的依赖：

            org.springframework.boot
            spring-boot-starter-jdbc
        

引入mysql连接类和连接池：

            mysql
            mysql-connector-java
            runtime
        
 
        
            com.alibaba
            druid
            1.0.29
        

开启web:

            org.springframework.boot
            spring-boot-starter-web
        

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.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123456

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

public class Account {
    private int id ;
    private String name ;
    private double money;
 
....省略了getter. setter
 
}

dao层

public interface IAccountDAO {
    int add(Account account);
 
    int update(Account account);
 
    int delete(int id);
 
    Account findAccountById(int id);
 
    List findAccountList();
}

具体的实现类：

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 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 findAccountList() {
        List list = jdbcTemplate.query("select * from account", new Object[]{}, new BeanPropertyRowMapper(Account.class));
        if(list!=null && list.size()>0){
            return list;
        }else{
            return null;
        }
    }
}

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