Question

我在http://www.phpclasses.org/browse/file/24355.html找到了简单的数据库包装器，但我无法获取行

<?php

class DBConnect
{

  static public  $HOST; 

  static public  $USER;

  static public  $PASS;

  static public  $BASE;

  static private $LINK = -1;

  public function Prepare($h,$u,$p,$b)
  {

    self::setHost($h);
    self::setUser($u);
    self::setPass($p);
    self::setBase($b);
  }

  public function setHost($h)  { self::$HOST = $h; }

  public function setUser($u)  { self::$USER = $u; }

  public function setPass($p)  { self::$PASS = $p; }

  public function setBase($b)  { self::$BASE = $b; }

  private function setLink($l) { self::$LINK = $l; }

  public function getHost() { return self::$HOST; }

  public function getUser() { return self::$USER; }

  public function getPass() { return self::$PASS; }

  public function getBase() { return self::$BASE; }


  public function getLink()
  {

    if( self::$LINK != -1 )
    {
      return self::$LINK;
    }
    else
    {
      try
      {
        $link = mysql_connect(self::getHost(),self::getUser(),self::getPass());
        self::setLink($link);
      }
      catch(Exception $e)
      {
        echo "Could not establish a link to the specified database.\n" . $e->getMessage();
        self::setLink(-1);
      }
      return self::$LINK;
    }
  }


  public function SelectDb($db='')
  {

    try
    {
      if( $db == '' )
        mysql_select_db(self::getBase(),self::getLink());
      else
        mysql_select_db($db,self::getLink());
    }
    catch(Exception $e)
    {
      echo "Could not select the specified database '$db'.\n" . $e->getMessage();
    }
  }

  public function Select($q)
  {

    try
    {
      $result = mysql_query($q,self::getLink());
      if( is_resource($result) )
        return $result;
    }
    catch(Exception $e)
    {
      echo "Could not query datasource.\n" . $e->getMessage();
    }
    return 0;
  }

  public function Insert($q)
  {

    try
    {
      mysql_query($q,self::getLink());
      return mysql_insert_id(self::getLink());
    }
    catch( Exception $e )
    {
      echo "Bad insert: " . $e->getMessage();
      return -1;
    }
  }

  public function Update($q)
  {

    return mysql_query($q,self::getLink());
  }

  public function Delete($q)
  {

    return mysql_query($q,self::getLink());
  }

  public function getRow($r)
  {

    if( is_resource($r) ) return mysql_fetch_assoc($r);
    return null;
  }

  public function Close()
  {

    if( is_resource(self::$LINK) ) mysql_close(self::$LINK);
  }

  public function Escape($s)
  {

    return mysql_real_escape_string($s,self::$LINK);
  }

}

以下是获取行的代码：

包括'DBConnect.php';

DBConnect::Prepare("127.0.0.1","myUser","myPass","mySchema");

$mysql_result = DBConnect::Select("SELECT * FROM myTable");
while($row = DBConnect::getRow($mysql_result)){

echo $row[id];

}

Answer 1

首先需要SelectDb

Answer 2

我不明白为什么这不起作用。我唯一想改变的是你的echo语句

echo $row[id];

to

echo $row['id'];

同样如下所述，你需要选择你想要处理的数据库，我们没有引用表，而是表所属的数据库

你需要使用它：

$db = DBConnect::SelectDb("dbname");

MySQL Wrapper和获取行

2 个答案: