dbutils.java

多级联动菜单 用Ajax和 javas实现的

package ajax.db;

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

public class DBUtils {	

	private static String drivers;

	private static String url;

	private static String user;

	private static String password;
	static {
		
		drivers = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
		url = "jdbc:microsoft:sqlserver://127.0.0.1:1433;databaseName=select_menu";
		user = "sa";
		password = "sa";
	}

	public static Connection getConnection() throws SQLException {
		Connection conn = null;
		try {
			Class.forName(drivers).newInstance();
			conn = DriverManager.getConnection(url, user, password);
		} catch (Exception e) {
			e.printStackTrace();
		}
		if (conn == null) {
			throw new SQLException("没有得到链接");
		}
		return conn;
	}

	public static void close(Connection conn) {
		if (conn == null)
			return;
		try {
			conn.close();
		} catch (SQLException e) {
			System.out.println("链接关闭错误");
		}
	}

	public static void close(Statement stmt) {
		try {
			if (stmt != null) {
				stmt.close();
			}
		} catch (SQLException e) {
			System.out.println("stmt没有关闭");
		}

	}

	public static void close(ResultSet rs) {
		try {
			if (rs != null) {
				rs.close();
			}
		} catch (SQLException e) {
			System.out.println("rs出现错误");
		}
	}

}