package com.roytel.rtccp.util;

import java.sql.*;

public class DBManager {

//用戶名

  PRivate String user = "";

//密碼

  private String passWord = "";

//主機

  private String host = "";

//數據庫名字

  private String database = "";

  /*

     private String url="jdbc:MySQL://"+host+"/"+"useUnicode=true&characterEncoding=GB2312";

   */

  private String url ="";

  private Connection con = null;

  Statement stmt;

  /**

   * 根據主機、數據庫名稱、數據庫用戶名、數據庫用戶密碼取得連接。

   * @param host String

   * @param database String

   * @param user String

   * @param password String

   */

  public DBManager(String host, String database, String user, String password) {

    this.host = host;

    this.database = database;

    this.user = user;

this.password = password;

//顯示中文

    this.url = "jdbc:mysql://" + host + "/" + database +

        "?useUnicode=true&characterEncoding=GB2312";

    try {

      Class.forName("org.gjt.mm.mysql.Driver");

    }

    catch (ClassNotFoundException e) {

      System.err.println("class not found:" + e.getMessage());

    }

    try {

      con = DriverManager.getConnection(this.url, this.user, this.password);

//連接類型為ResultSet.TYPE_SCROLL_INSENSITIVE,                                 ResultSet.CONCUR_READ_ONLY

      stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,

                                 ResultSet.CONCUR_READ_ONLY);

    }

    catch (SQLException a) {

      System.err.println("sql exception:" + a.getMessage());

    }

  }

/**

* 返回取得的連接

*/

  public Connection getCon() {

    return con;

  }

/**

* 執行一條簡單的查詢語句

* 返回取得的結果集

*/

  public ResultSet executeQuery(String sql) {

    ResultSet rs = null;

    try {

      rs = stmt.executeQuery(sql);

    }

    catch (SQLException e) {

      e.printStackTrace();

    }

    return rs;

  }

/**

* 執行一條簡單的更新語句

* 執行成功則返回true

*/

  public boolean executeUpdate(String sql) {

    boolean v = false;

    try {

      v = stmt.executeUpdate(sql) > 0 ? true : false;

    }

    catch (SQLException e) {

      e.printStackTrace();

    }

    finally {

      return v;

    }

  }

}