db.java

相关新闻浏览,把相关的新闻列表显示.Java实现

package news;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DB {
	Connection connect = null;
	ResultSet rs = null;
	public DB() {
		try {
			Class.forName("com.mysql.jdbc.Driver"); 	//设置驱动程序类型		
		}
		catch(java.lang.ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	public ResultSet executeQuery(String sql) {
		try {
			connect = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "1234");  
			Statement stmt = connect.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
			rs = stmt.executeQuery(sql);//执行指定的数据查询语句
		} 
		catch(SQLException ex) { 
			ex.printStackTrace();
		}
		return rs;
	}
	public int executeUpdate(String sql) {
		int result = 0;
		try {
			connect = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "1234"); 
			Statement stmt = connect.createStatement();
			result = stmt.executeUpdate(sql);//执行指定的数据操作语句
		} 
		catch(SQLException ex) { 
			System.err.println(ex.getMessage());		
		}
		return result;
	}
	public void close(){
		if(connect!=null){
			try{
				connect.close();
				connect = null;	
			}catch(SQLException ex) { 
				System.err.println(ex.getMessage());
			}
		}	
	}
	

}