Java-MySql连接 自定义操作类

自定义操作类 在操作数据库时更方便

package com.test;

import java.sql.*;

public class OperateSql {
	private String username;
	private String password;
	private String url;
	//private String sql;
	private String sqlDriver;
	private Connection conn;
	private Statement stm;
	private ResultSet rs;
	
	public OperateSql(String username,String password,String url,String sqlDriver)
	{
		this.username = username;
		this.password = password;
		this.url = url;
		this.sqlDriver = sqlDriver;
	}
	
	/*
	 * 数据库连接
	 */
	public void OpenLink()
	{
		try
		{
			Class.forName(this.sqlDriver);
			this.conn = DriverManager.getConnection(this.url,this.username,this.password);
		}
		catch(Exception e)
		{
			System.out.println("数据库连接异常");
		}
	}
	/*
	 * 执行sql查询语句
	 */
	public void Query(String sql)
	{
		//this.sql = sql;
		try
		{
			this.stm = this.conn.createStatement();
			this.rs = this.stm.executeQuery(sql);
			//System.out.println(this.rs);
		}
		catch(Exception e)
		{
			System.out.println("查询操作异常");
		}
	}
	/*
	 * 执行查询操作并返回一个ResultSet结果集
	 */
	public ResultSet select(String sql)
	{
		OpenLink();
		Query(sql);
		return this.rs;
		
	}
	/*
	 * 数据库更新操作
	 */
	 public void Update(String sql)
	 {
		 OpenLink();
		 try
		 {
		 this.stm = this.conn.createStatement();
		 this.stm.executeUpdate(sql);
		 }
		 catch(Exception e)
		 {
			 System.out.println("更新操作异常");
		 }
	 }
	 /*
	  * 关闭数据库查询操作
	  */
	 public void closeSelect()
	 {
		 try
		 {
			 stm.close();
			 rs.close();
			 conn.close();
		 }
		 catch(Exception e)
		 {
			 System.out.println("数据库关闭异常");
		 }
	 }
	 /*
	  * 关闭数据库更新操作
	  */
	 public void closeUpdate()
	 {
		 try
		 {
			 stm.close();
			 conn.close();
		 }
		 catch(Exception e)
		 {
			 System.out.println("数据库关闭异常");
		 }
	 }
}

OperateSqlTest 测试操作类

package com.test;

import com.test.OperateSql;
import java.sql.*;

public class OperateSqlTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String sqlDriver = "com.mysql.jdbc.Driver";
		String strUrl = "jdbc:mysql://localhost:3306/stdmng?useSSL=false";
		String user = "root";
		String password = "password";
		
		OperateSql operatesql = new OperateSql(user,password,strUrl,sqlDriver);
		
		String sql = "select name,password,age,sex,birthday from student";
		ResultSet rs = operatesql.select(sql);
		
		try {
			while(rs.next())
			{
				try {
					System.out.print(rs.getString(1)+"\t");
					System.out.print(rs.getString(2)+"\t");
					System.out.print(rs.getString(3)+"\t");
					System.out.print(rs.getString(4)+"\t");
					System.out.print(rs.getString(5)+"\t");
					System.out.print("\n");
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		operatesql.closeSelect();
	}

}

MySql数据库student表截图和运行结果截图