PHP数据库连接类

Question

我试图从一个类中的数据库获取用户ID，但是我对类的经验很少甚至没有，我该如何从数据库中获取uid并返回uid？

所以基本上是这样的

class hello {
   public function getUid(){
      //connect to the db
      //get all of the users info
      $array = mysql_fetch_array($result);
      $uid = $array['uid'];

      return $uid;
   }
}

就像我说的，我还是新手，所以任何建议或帮助都将不胜感激！

提前感谢！

Answer 1

首先构建一个MySQL类库…满足以下示例中的要求：

<?php

include '../config/Dbconfig.php';

class Mysql extends Dbconfig    {

public $connectionString;
public $dataSet;
private $sqlQuery;

    protected $databaseName;
    protected $hostName;
    protected $userName;
    protected $passCode;

function Mysql()    {
    $this -> connectionString = NULL;
    $this -> sqlQuery = NULL;
    $this -> dataSet = NULL;

            $dbPara = new Dbconfig();
            $this -> databaseName = $dbPara -> dbName;
            $this -> hostName = $dbPara -> serverName;
            $this -> userName = $dbPara -> userName;
            $this -> passCode = $dbPara ->passCode;
            $dbPara = NULL;
}

function dbConnect()    {
    $this -> connectionString = mysql_connect($this -> serverName,$this -> userName,$this -> passCode);
    mysql_select_db($this -> databaseName,$this -> connectionString);
    return $this -> connectionString;
}

function dbDisconnect() {
    $this -> connectionString = NULL;
    $this -> sqlQuery = NULL;
    $this -> dataSet = NULL;
            $this -> databaseName = NULL;
            $this -> hostName = NULL;
            $this -> userName = NULL;
            $this -> passCode = NULL;
}

function selectAll($tableName)  {
    $this -> sqlQuery = 'SELECT * FROM '.$this -> databaseName.'.'.$tableName;
    $this -> dataSet = mysql_query($this -> sqlQuery,$this -> connectionString);
            return $this -> dataSet;
}

function selectWhere($tableName,$rowName,$operator,$value,$valueType)   {
    $this -> sqlQuery = 'SELECT * FROM '.$tableName.' WHERE '.$rowName.' '.$operator.' ';
    if($valueType == 'int') {
        $this -> sqlQuery .= $value;
    }
    else if($valueType == 'char')   {
        $this -> sqlQuery .= "'".$value."'";
    }
    $this -> dataSet = mysql_query($this -> sqlQuery,$this -> connectionString);
    $this -> sqlQuery = NULL;
    return $this -> dataSet;
    #return $this -> sqlQuery;
}

function insertInto($tableName,$values) {
    $i = NULL;

    $this -> sqlQuery = 'INSERT INTO '.$tableName.' VALUES (';
    $i = 0;
    while($values[$i]["val"] != NULL && $values[$i]["type"] != NULL)    {
        if($values[$i]["type"] == "char")   {
            $this -> sqlQuery .= "'";
            $this -> sqlQuery .= $values[$i]["val"];
            $this -> sqlQuery .= "'";
        }
        else if($values[$i]["type"] == 'int')   {
            $this -> sqlQuery .= $values[$i]["val"];
        }
        $i++;
        if($values[$i]["val"] != NULL)  {
            $this -> sqlQuery .= ',';
        }
    }
    $this -> sqlQuery .= ')';
            #echo $this -> sqlQuery;
    mysql_query($this -> sqlQuery,$this ->connectionString);
            return $this -> sqlQuery;
    #$this -> sqlQuery = NULL;
}

function selectFreeRun($query)  {
    $this -> dataSet = mysql_query($query,$this -> connectionString);
    return $this -> dataSet;
}

function freeRun($query)    {
    return mysql_query($query,$this -> connectionString);
  }
}
?>

和配置文件…

<?php
class Dbconfig {
    protected $serverName;
    protected $userName;
    protected $passCode;
    protected $dbName;

    function Dbconfig() {
        $this -> serverName = 'localhost';
        $this -> userName = 'root';
        $this -> passCode = 'pass';
        $this -> dbName = 'dbase';
    }
}
?>