jinghuaconn.java

在线考试软件。 在线考试软件详细设计说明书：说明在线测试这一模块各部分的功能和结构

package jinghua;

/**
 * <p>Title: Jinghua-TestOnline</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Bit</p>
 * @author ChengBaodong
 * @version 1.0
 */

import java.sql.*;

//sqlConn=java.sql.DriverManager.getConnection(
//"jdbc:mysql://localhost/train?user=support&password=support&useUnicode=true&characterEncoding=gb2312");
//String MM_con1_DRIVER = "com.mysql.jdbc.Driver";
//String MM_con1_USERNAME = "root";
//String MM_con1_PASSWORD = "";
//String MM_con1_STRING = "jdbc:mysql://localhost/jinghua";
//Driver DriverRecordset1 = (Driver)Class.forName(MM_con1_DRIVER).newInstance();
//Connection Con = java.sql.DriverManager.getConnection(MM_con1_STRING,MM_con1_USERNAME,MM_con1_PASSWORD);

public class JinghuaConn {
    private static String rootpath="D:\\JavaApp\\Jinghua\\test_online";
    private static String chartPath="D:\\JavaApp\\Jinghua\\test_online\\chart\\temp";
//    private static String rootpath="/sfroot/home/groups/jsptestonline";
//    private static String chartPath="/sfroot/home/groups/jsptestonline/chart/temp";
    private String sample = "Sample";
    private Connection con = null;
    private Statement stmt = null;
    ResultSet rs = null;
    private static final String DRIVER = "com.mysql.jdbc.Driver";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "";
   private static final String HOST = "http://localhost:8080";

//    private static final String HOST = "http://jsptestonline.cosoft.org.cn";
    private static final String PHYPATH = "D:/JavaApp/Jinghua/test_online";
//    private static final String PHYPATH = "/sfroot/home/groups/jsptestonline";
    private static final String CONNECTION_STRING =
        "jdbc:mysql://localhost/jinghua";
    public static String getRootPath(){
        return rootpath;
    }
    public static String getChartPath(){
        return chartPath;
    }

    public JinghuaConn() {
        try {
            Driver DriverJinghua = (Driver) Class.forName(DRIVER).newInstance();
            //Con = DriverManager.getConnection(CONNECTION_STRING,USERNAME,PASSWORD);
        }
        catch (ClassNotFoundException e) {
            System.err.println("JinghuaConn():" + e.toString());
        }
        catch (Exception e) {
            System.err.println("JinghuaConn():" + e.toString());
        }

    }

    public Connection getConnection() {
        try {

            //Con = DriverManager.getConnection(CONNECTION_STRING,USERNAME,PASSWORD);
            String strUrl = CONNECTION_STRING + "?user=" + USERNAME +
                "&password=" +
                PASSWORD + "&useUnicode=true&characterEncoding=gb2312";
            con = DriverManager.getConnection(strUrl);

        }

        catch (Exception e) {
            con = null;
        }

        return con;
    }

    public void dropConnection() {
        try {
            closeStmt();
            con.close();
        }
        catch (Exception ignored) {}
        finally {
            con = null;
        }
    }

    public ResultSet executeQuery(String sql) {
        rs = null;
        try {
            //conStr = conStr + user ;
            con = getConnection();
            stmt = con.createStatement();
            rs = stmt.executeQuery(sql);
        }
        catch (SQLException ex) {
            System.err.println("JinghuaConn.executeQuery(): " + ex.getMessage() );
        }
        return rs;
    }

    public void executeUpdate(String sql) {
        stmt = null;
        rs = null;
        try {
            //conStr = conStr + user ;
            con =getConnection();
            stmt = con.createStatement();
            stmt.executeUpdate(sql);
            stmt.close();
            con.close();
        }
        catch (SQLException ex) {
            System.err.println("JinghuaConn:executeUpdate(): " + ex.getMessage());
        }
    }

    public void execute(String sql) {
        stmt = null;
        rs = null;
        try {
            //conStr = conStr + user ;
            con = getConnection();
            stmt = con.createStatement();
            stmt.execute(sql);
            stmt.close();
            con.close();
        }
        catch (SQLException ex) {
            System.err.println("JinghuaConn:execute(): " + ex.getMessage());
        }
    }

    public void closeStmt() {
        try {
            stmt.close();
        }
        catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void closeConn() {
        try {
            con.close();
        }
        catch (SQLException e) {
            e.printStackTrace();
        }
    }


}