电子商务commerce

package com.wgh.DB; import java.sql.*; import java.io.*; import java.util.*; public class connDB { public Connection conn = null; public Statement stmt = null; public ResultSet rs = null; private static String propFileName = "C:/connDB.properties"; private static Properties prop = new Properties(); private static String dbClassName = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; private static String dbUrl = "jdbc:sqlserver://localhost:1433;DatabaseName=db_shop"; private static String dbUser = "sa"; private static String dbPwd = "sa"; private static void loadProperty() { try { prop.load(new FileInputStream(propFileName)); //通过文件输入流对象加载Properties文件 dbClassName = prop.getProperty("DB_CLASS_NAME"); dbUrl = prop.getProperty("DB_URL", "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_shop"); dbUser = prop.getProperty("DB_USER", "sa"); dbPwd = prop.getProperty("DB_PWD", "sa"); } catch (Exception e) { e.printStackTrace(); } } public static Connection getConnection() { Connection conn = null; loadProperty(); try { Class.forName(dbClassName).newInstance(); conn = DriverManager.getConnection(dbUrl, dbUser, dbPwd); } catch (Exception ee) { ee.printStackTrace(); } if (conn == null) { System.err.println( "警告: DbConnectionManager.getConnection() 获得数据库链接失败.\r\n\r\n链接类型:" + dbClassName + "\r\n链接位置:" + dbUrl + "\r\n用户/密码" + dbUser + "/" + dbPwd); } return conn; } /* *功能：执行查询语句 */ public ResultSet executeQuery(String sql) { try { conn = getConnection(); stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); rs = stmt.executeQuery(sql); } catch (SQLException ex) { System.err.println(ex.getMessage()); } return rs; } /* *功能:执行更新操作 */ public int executeUpdate(String sql) { int result = 0; try { conn = getConnection(); stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); result = stmt.executeUpdate(sql); } catch (SQLException ex) { result = 0; } try { stmt.close(); } catch (SQLException ex1) { } return result; } public int executeUpdate_id(String sql) { int result = 0; try { conn = getConnection(); stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); result = stmt.executeUpdate(sql); String ID = "select @@IDENTITY as id"; rs = stmt.executeQuery(ID); if (rs.next()) { int autoID = rs.getInt("id"); result = autoID; } } catch (SQLException ex) { result = 0; } return result; } /* *功能:关闭数据库的连接 */ public void close() { try { if (rs != null) { rs.close(); } } catch (Exception e) { e.printStackTrace(System.err); } try { if (stmt != null) { stmt.close(); } } catch (Exception e) { e.printStackTrace(System.err); } try { if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(System.err); } } }