db.java

这是一个BBS系统

package com.fang.bbs;

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

public class DB {
	public static Connection getConn(){
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bbs","root","12345");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		return conn;
	}
	
	public static Statement createStmt(Connection conn){
		Statement stmt = null;
		try {
			stmt = conn.createStatement();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return stmt;
		
	}
	
	public static PreparedStatement prepareStmt(Connection conn,String sql){
		PreparedStatement pstmt=null;
		try {
			pstmt = conn.prepareStatement(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return pstmt;
	}
	
	
	public static PreparedStatement prepareStmt(Connection conn,String sql,int autoGeneratedKeys){
		PreparedStatement pstmt=null;
		try {
			pstmt = conn.prepareStatement(sql,autoGeneratedKeys);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return pstmt;
	}
	
	
	
	public static ResultSet executeQuery(Statement stmt,String sql){
		ResultSet rs = null;
		try {
			rs = stmt.executeQuery(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return rs;
		
	}
	
	public static void close(Connection conn){
		if(conn != null){
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	} 
	public static void close(Statement stmt){
		if(stmt != null){
			try {
				stmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	} 
	
	public static void close(ResultSet rs){
		if(rs != null){
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	} 
	

}