简单实现jdbc连接数据库工具类

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第一步:导入连接mysql数据库所需要的jar包

第二步:实现一个简单的jdbc连接数据库工具类

package jdbc;

import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.PreparedStatement;  
import java.sql.SQLException; 

/**
 * JDBC连接MYSQL工具类
 * yiqqin 2017.4.19
 */
public class DBHelper {
	
    public static final String url = "jdbc:mysql://115.115.115.115/mydatabase";  
    public static final String name = "com.mysql.jdbc.Driver";  
    public static final String user = "root";
    public static final String password = "root";
    
    public Connection conn = null;  
    public PreparedStatement pst = null; 
    
    public DBHelper(String sql) {  
        try {  
            Class.forName(name);//指定连接类型  
            conn = DriverManager.getConnection(url, user, password);//获取连接  
            pst = conn.prepareStatement(sql);//准备执行语句  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
  
    public void close() {  
        try {  
            this.conn.close();  
            this.pst.close();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
    } 
}

第三步:写一个测试类,看连接是否成功

package demo;

import java.sql.ResultSet;  
import java.sql.SQLException;
import jdbc.DBHelper;

/**
 * 测试JDBC连接MYSQL
 * qinyi 2017.4.19
 */
public class TestJDBC {
	
    static String sql = null;  
    static DBHelper db1 = null;  
    static ResultSet ret = null;
    
	public static void main(String[] args) {
		
        sql = "SELECT imgurl,articleurl FROM imgurltable WHERE imgurltable.`index` = 6473172 and 1=1";//SQL语句  
        db1 = new DBHelper(sql);//创建DBHelper对象 
        
        try {  
            ret = db1.pst.executeQuery();//执行语句，得到结果集  
            while (ret.next()) {  
                String imgurl = ret.getString(1).substring(0, 18);  
                String articleurl = ret.getString(2).substring(0, 18);  
                System.out.println(imgurl + "\t" + articleurl);  
            }//显示数据 
            ret.close();  
            db1.close();//关闭连接  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }
		
	}
}