Java springcloud B2B2C o2o多使用者商城 springcloud架構（三）SpringBoot用JdbcTemplates訪問Mysql

happywawa發表於2019-03-20
JavaGCCloud架構Spring BootJDBCMySql

準備工作

  • jdk 1.8
  • maven 3.0
  • idea
  • mysql

初始化mysql:

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-- 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');

　　

建立工程

引入依賴：

在pom檔案引入spring-boot-starter-jdbc的依賴：

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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

　　引入mysql連線類和連線池：

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<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:

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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

　　

配置相關檔案

在application.properties檔案配置mysql的驅動類，資料庫地址，資料庫賬號、密碼資訊。

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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資訊，springboot就可以訪問資料庫類。

具體編碼

實體類

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

　　

dao層

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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：

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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;
}
}
}

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