JDBC解析1_獲取數據源

 

package book.database;

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

/**
 * 連接各類數據庫的方法
 */
public class DBConnector {
 /**
  * 獲得數據庫連接
  * @param driverClassName 連接數據庫用到的驅動類的類名
  * @param dbURL  數據庫的URL
  * @param userName 登陸數據庫的用戶名
  * @param password 登陸數據庫的密碼
  * @return
  * @throws ClassNotFoundException
  * @throws SQLException
  */
 public static Connection getConnection(String driverClassName,
   String dbURL, String userName, String password)
   throws ClassNotFoundException, SQLException {
  Connection con = null;

  // 加載連接數據庫的驅動類
  Class.forName(driverClassName);
  // 用用戶名、密碼連接數據庫
  con = DriverManager.getConnection(dbURL, userName, password);

  return con;
 }

 /**
  * 獲得Oracle數據庫的連接
  * @param dricerClassName 連接數據庫用到的驅動類的類名
  * @param serverHost 數據庫所在服務器的IP或域名
  * @param serverPort 數據庫所在服務器的端口
  * @param dbName  數據庫名
  * @param userName  登陸數據庫的用戶名
  * @param password  登陸數據庫的密碼
  * @return
  * @throws ClassNotFoundException  數據庫驅動類無法找到是拋出該異常
  * @throws SQLException  創建連接時可能拋出該異常
  */
 public static Connection getOracleConnection(String dricerClassName,
   String serverHost, String serverPort, String dbName,
   String userName, String password) throws ClassNotFoundException,
   SQLException {
  // 如果沒有提供這些連接參數，則用默認值
  if (dricerClassName == null) {
   dricerClassName = "oracle.jdbc.driver.OracleDriver";
  }
  if (serverHost == null) {
   serverHost = "127.0.0.1";
  }
  if (serverPort == null) {
   serverPort = "1521";
  }
  // 構建訪問Oracle數據庫的URL
  String dbURL = "jdbc:oracle:thin:@" + serverHost + ":" + serverPort
    + ":" + dbName;
  return getConnection(dricerClassName, dbURL, userName, password);
 }

 /**
  * 獲得DB2數據庫的連接
  */
 public static Connection getDB2Connection(String dricerClassName,
   String serverHost, String serverPort, String dbName,
   String userName, String password) throws ClassNotFoundException,
   SQLException {
  // 如果沒有提供這些連接參數，則用默認值
  if (dricerClassName == null) {
   dricerClassName = "com.ibm.db2.jdbc.app.DB2Driver";
  }
  if (serverHost == null) {
   serverHost = "127.0.0.1";
  }
  if (serverPort == null) {
   serverPort = "5000";
  }
  // 構建訪問DB2數據庫的URL
  String dbURL = "jdbc:db2://" + serverHost + ":" + serverPort
    + "/" + dbName;
  return getConnection(dricerClassName, dbURL, userName, password);
 }

 /**
  * 獲得SQL Server數據庫的連接
  */
 public static Connection getSQLServerConnection(String dricerClassName,
   String serverHost, String serverPort, String dbName,
   String userName, String password) throws ClassNotFoundException,
   SQLException {
  // 如果沒有提供這些連接參數，則用默認值
  if (dricerClassName == null) {
   dricerClassName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
  }
  if (serverHost == null) {
   serverHost = "127.0.0.1";
  }
  if (serverPort == null) {
   serverPort = "1433";
  }
  // 構建訪問SQL Server數據庫的URL
  String dbURL = "jdbc:microsoft:sqlserver://" + serverHost + ":" + serverPort
    + "; DatabaseName=" + dbName;
  return getConnection(dricerClassName, dbURL, userName, password);
 }

 /**
  * 獲得MySQL數據庫的連接
  */
 public static Connection getMySQLConnection(String dricerClassName,
   String serverHost, String serverPort, String dbName,
   String userName, String password) throws ClassNotFoundException,
   SQLException {
  // 如果沒有提供這些連接參數，則用默認值
  if (dricerClassName == null) {
   dricerClassName = "com.mysql.jdbc.Driver";
  }
  if (serverHost == null) {
   serverHost = "127.0.0.1";
  }
  if (serverPort == null) {
   serverPort = "3306";
  }
  // 構建訪問SQL Server數據庫的URL
  String dbURL = "jdbc:mysql://" + serverHost + ":" + serverPort
    + "/" + dbName;
  return getConnection(dricerClassName, dbURL, userName, password);
 }

 /**
  * 獲得Sybase數據庫的連接
  */
 public static Connection getSybaseConnection(String dricerClassName,
   String serverHost, String serverPort, String dbName,
   String userName, String password) throws ClassNotFoundException,
   SQLException {
  // 如果沒有提供這些連接參數，則用默認值
  if (dricerClassName == null) {
   dricerClassName = "com.sybase.jdbc3.jdbc.SybDriver";
  }
  if (serverHost == null) {
   serverHost = "127.0.0.1";
  }
  if (serverPort == null) {
   serverPort = "5007";
  }
  // 構建訪問SQL Server數據庫的URL
  String dbURL = "jdbc:sybase:Tds:" + serverHost + ":" + serverPort
    + "/" + dbName;
  return getConnection(dricerClassName, dbURL, userName, password);
 }

 /**
  * 獲得PostgreSQL數據庫的連接
  */
 public static Connection getPostgreSQLConnection(String dricerClassName,
   String serverHost, String serverPort, String dbName,
   String userName, String password) throws ClassNotFoundException,
   SQLException {
  // 如果沒有提供這些連接參數，則用默認值
  if (dricerClassName == null) {
   dricerClassName = "org.postgresql.Driver";
  }
  if (serverHost == null) {
   serverHost = "127.0.0.1";
  }
  if (serverPort == null) {
   serverPort = "5432";
  }
  // 構建訪問SQL Server數據庫的URL
  String dbURL = "jdbc:postgresql://" + serverHost + ":" + serverPort
    + "/" + dbName;
  return getConnection(dricerClassName, dbURL, userName, password);
 }

 public static void main(String[] args) throws ClassNotFoundException,
   SQLException {
  // 獲得本地MySQL的連接實例，使用MySQL需要去www.mysql.com下載最新的MySQL安裝程序和Java驅動
  // MySQL有多個連接MySQL的驅動類，如org.gjt.mm.mysql.Driver。
  // 這裏使用MySQL官方網站上提供的驅動類
  String mySQLDirver = "com.mysql.jdbc.Driver";
  String dbName = "studentdb";
  String userName = "test";
  String password = "test";
  Connection con = DBConnector.getMySQLConnection(mySQLDirver,
    null, null, dbName, userName, password);
  System.out.println("連接MySQL數據庫成功！");
  con.close();
  System.out.println("成功關閉與MySQL數據庫的連接！");
  String url = "jdbc:mysql://127.0.0.1:3306/" +  dbName;
  con = DBConnector.getConnection(mySQLDirver, url, userName, password);
  System.out.println("連接MySQL數據庫成功！");
  con.close();
  System.out.println("成功關閉與MySQL數據庫的連接！");
 }
}