src/com/dao/DB.java

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package com.dao;

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

public class DB
{
	private Connection con;

	private PreparedStatement pstm;

	private String user = "sa";

	private String password = "sa";

	private String className = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

	private String url = "jdbc:sqlserver://localhost:1433;databaseName=db_jzxcz";

	public DB()
	{
		try
		{
			Class.forName(className);
		} catch (ClassNotFoundException e)
		{
			System.out.println("加载数据库驱动失败！");
			e.printStackTrace();
		}
	}

	/** 创建数据库连接 */
	public Connection getCon()
	{
		try
		{
			con = DriverManager.getConnection(url, user, password);
		} catch (SQLException e)
		{
			System.out.println("创建数据库连接失败！");
			con = null;
			e.printStackTrace();
		}
		return con;
	}

	public void doPstm(String sql, Object[] params)
	{
		if (sql != null && !sql.equals(""))
		{
			if (params == null)
				params = new Object[0];

			getCon();
			if (con != null)
			{
				try