3/25

3/18

package db;

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

public class jdbcmysql {
  private Connection con = null; //Database objects
  //連接object
  private Statement stat = null;
  //執行,傳入之sql為完整字串
  private ResultSet rs = null;
  //結果集
  private PreparedStatement pst = null;
  //執行,傳入之sql為預儲之字申,需要傳入變數之位置
  //先利用?來做標示

  private String dropdbSQL = "DROP TABLE User ";

  private String createdbSQL = "CREATE TABLE User (" +
    "    id     INTEGER " +
    "  , name    VARCHAR(20) " +
    "  , passwd  VARCHAR(20))";

  private String insertdbSQL = "insert into User(id,name,passwd) " +
      "select ifNULL(max(id),0)+1,?,? FROM User";

  private String selectSQL = "select * from User ";

  public jdbcmysql()
  {
    try {
      Class.forName("com.mysql.jdbc.Driver");
      //註冊driver
      con = DriverManager.getConnection(
      "jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=Big5",
      "","");
      //取得connection

//jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=Big5
//localhost是主機名,test是database名
//useUnicode=true&characterEncoding=Big5使用的編碼
   
    }
    catch(ClassNotFoundException e)
    {
      System.out.println("DriverClassNotFound :"+e.toString());
    }//有可能會產生sqlexception
    catch(SQLException x) {
      System.out.println("Exception :"+x.toString());
    }
 
  }
  //建立table的方式
  //可以看看Statement的使用方式
  public void createTable()
  {
    try
    {
      stat = con.createStatement();
      stat.executeUpdate(createdbSQL);
    }
    catch(SQLException e)
    {
      System.out.println("CreateDB Exception :" + e.toString());
    }
    finally
    {
      Close();
    }
  }
  //新增資料
  //可以看看PrepareStatement的使用方式
  public void insertTable( String name,String passwd)
  {
    try
    {
      pst = con.prepareStatement(insertdbSQL);
   
      pst.setString(1, name);
      pst.setString(2, passwd);
      pst.executeUpdate();
    }
    catch(SQLException e)
    {
      System.out.println("InsertDB Exception :" + e.toString());
    }
    finally
    {
      Close();
    }
  }
  //刪除Table,
  //跟建立table很像
  public void dropTable()
  {
    try
    {
      stat = con.createStatement();
      stat.executeUpdate(dropdbSQL);
    }
    catch(SQLException e)
    {
      System.out.println("DropDB Exception :" + e.toString());
    }
    finally
    {
      Close();
    }
  }
  //查詢資料
  //可以看看回傳結果集及取得資料方式
  public void SelectTable()
  {
    try
    {
      stat = con.createStatement();
      rs = stat.executeQuery(selectSQL);
      System.out.println("ID\t\tName\t\tPASSWORD");
      while(rs.next())
      {
        System.out.println(rs.getInt("id")+"\t\t"+
            rs.getString("name")+"\t\t"+rs.getString("passwd"));
      }
    }
    catch(SQLException e)
    {
      System.out.println("DropDB Exception :" + e.toString());
    }
    finally
    {
      Close();
    }
  }
  //完整使用完資料庫後,記得要關閉所有Object
  //否則在等待Timeout時,可能會有Connection poor的狀況
  private void Close()
  {
    try
    {
      if(rs!=null)
      {
        rs.close();
        rs = null;
      }
      if(stat!=null)
      {
        stat.close();
        stat = null;
      }
      if(pst!=null)
      {
        pst.close();
        pst = null;
      }
    }
    catch(SQLException e)
    {
      System.out.println("Close Exception :" + e.toString());
    }
  }


  public static void main(String[] args)
  {
    //測看看是否正常
    jdbcmysql test = new jdbcmysql();
    test.dropTable();
    test.createTable();
    test.insertTable("yku", "12356");
    test.insertTable("yku2", "7890");
    test.SelectTable();

  }
}

3/11

<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "test";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM `user`";
$result = $conn->query($sql);

if ($result != null) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["name"]. $row["passwd"]. "<br>";
    }
} else {
    echo "0 results";
}
$conn->close();
?>