Java连接数据库查询数据实例

Java工程结构图

maven工程,可参考:

bee.properties

#bee.db.dbName=MySQL
#bee.db.driverName = com.mysql.jdbc.Driver
bee.db.url =jdbc:mysql://localhost:3306/bee?characterEncoding=UTF-8
bee.db.username =root
bee.db.password =

BeeTest.java

/*
 * Copyright 2016-2021 the original author.All rights reserved.
 * Kingstar(honeysoft@126.com)
 * The license,see the LICENSE file.
 */

package org.bee.exam;

import java.util.List;

import org.bee.exam.entity.Orders;
import org.teasoft.bee.osql.Suid;
import org.teasoft.honey.osql.core.BeeFactoryHelper;

/**
 * @author Kingstar
 * @since  1.9
 */
public class BeeTest {
	public static void main(String[] args) {

		Suid suid = BeeFactoryHelper.getSuid();
		Orders orders1 = new Orders();
		orders1.setName("Bee(ORM Framework)");
		List<Orders> list1 = suid.select(orders1); //select
		for (int i = 0; i < list1.size(); i++) {
			System.out.println(list1.get(i).toString());
		}
	}
}
//注意: 事务,分页,排序,范围查询,查询结果直接返回json等都支持,这里只是一个入门例子.
//更加应用参考,请查看官网: 更多例子   和    综合应用 .
//https://github.com/automvc/bee
//https://gitee.com/automvc/bee

表orders对应的实体Javabean–Orders.

package org.bee.exam.entity;

import java.io.Serializable;
import java.math.BigDecimal;

/**
*@author Honey
*Create on 2020-10-01 12:41:06
*/
public class Orders implements Serializable {

	
	private static final long serialVersionUID = 1593472489996L;

	//time-->String
	private Long id;
	private String userid;
	private String name;
	private BigDecimal total;
	private String createtime;
	private String remark;
	private String sequence;
	private String abc;
	private String updatetime;

	//...get,set

	 public String toString(){	
		 StringBuffer str=new StringBuffer();	
		 str.append("Orders[");			
		 str.append("id=").append(id);		 
		 str.append(",userid=").append(userid);		 
		 str.append(",name=").append(name);		 
		 str.append(",total=").append(total);		 
		 str.append(",createtime=").append(createtime);		 
		 str.append(",remark=").append(remark);		 
		 str.append(",sequence=").append(sequence);		 
		 str.append(",abc=").append(abc);		 
		 str.append(",updatetime=").append(updatetime);		 
		 str.append("]");			 
		 return str.toString();			 
	 }	
	
}

运行结果:

Orders[id=637266389106717,userid=bee,name=Bee(ORM Framework),total=91.990000,createtime=null,remark=null,sequence=null,abc=null,updatetime=null]
Orders[id=637266389106743,userid=bee,name=Bee(ORM Framework),total=91.990000,createtime=2021-10-25 12:29:16,remark=null,sequence=null,abc=null,updatetime=null]
Orders[id=637266389106744,userid=bee,name=Bee(ORM Framework),total=91.990000,createtime=null,remark=null,sequence=null,abc=null,updatetime=null]

查询订单表数据:

关键语句只要两句就搞定.

Suid suid = BeeFactoryHelper.getSuid();

List<Orders> list1 = suid.select(orders1);//select 查询订单表数据

配置,只需要将数据的连接, 用户名,密码等信息写在bee.properties即可.

如此简单, 在于一个, 该框架帮我们处理了许多对数据库的固定操作,让我们从操作DB的繁杂步骤解放出来,尽快进入到业务逻辑的开发中.