在php中连接到mysql时，query_id没有返回任何内容

问题描述：

My query is:

$sqlCommand="select `ID` from `freecomputermarket`.`members` where `UserName`='$this->_userName';";

i am usign XAMPP as apache server and i am working on port (89)

this class responsible for database connection:

<?php
class MySql
{
    private $_link_Id,$_query_Id,$_serverName,$_userName,$_password,$_dbName,$_rowNum;

    public function __construct()
    {
       $this->_serverName="localhost";
       $this->_userName="root";
       $this->_password="";
       $this->_dbName="freecomputermarket";
    }
    public function connect()
    {
       $this->_link_Id=mysql_connect($this->_serverName,$this->_userName,$this->_password);
       if(!$this->_link_Id)
       {
          exit("The Connect is Failed");
       }
       $db_select=mysql_select_db($this->_dbName,$this->_link_Id);
       if(!$db_select)
       {
          exit("Can't Select DataBase");
       }
    }
    public function query($sqlcommand)
    {
       $sqlcommand= addslashes($sqlcommand);
       //echo $sqlcommand;
       $this->_query_Id=mysql_query($sqlcommand,$this->_link_Id);
       exit($this->_query_Id);//print it to check if it is available.
       if(!$this->_query_Id)
          exit("Query failed");
       $this->_rowNum=mysql_affected_rows();
    }
    public function getRow()
    {
       if($this->_rowNum)
       {
          return mysql_fetch_assoc($this->_query_Id);
       }
    }
    public function getAllRows()
    {
       $arr=array();
       $count=0;
       while($count<$this->_rowNum)
       {
          array_push($arr,$this->GetRow());
          $count++;
       }
       return $arr;
    }
    public function getAffectedRowsNumber()
    {
       return $this->_rowNum;
    }
}   
?>

this code for connecting to the mysql dbms and execute queries. when printing $_link_Id ,it has a value. when printing $_query_Id ,it has nothing ?

答

Problem is here

$sqlcommand= addslashes($sqlcommand);

Don't use addslashes.

use like this

//$sqlcommand= addslashes($sqlcommand);
$this->_query_Id=mysql_query($sqlcommand,$this->_link_Id);

答

<?php
class MySql
{
    private $_link_Id,$_query_Id,$_serverName,$_userName,$_password,$_dbName,$_rowNum;

    public function __construct()
    {
        $this->_serverName="localhost";
        $this->_userName="root";
        $this->_password="";
        $this->_dbName="freecomputermarket";
    }
    public function connect()
    {
        $this->_link_Id=mysql_connect($this->_serverName,$this->_userName,$this->_password);
        if(!$this->_link_Id)
        {
                                                exit("The Connect is Failed");
        }
        $db_select=mysql_select_db($this->_dbName,$this->_link_Id);
        if(!$db_select)
        {
                                                exit("Can't Select DataBase");
        }
    }
    public function query($sqlcommand)
    {
                                        // $sqlcommand= addslashes($sqlcommand);
                                          //echo $sqlcommand;
        $this->_query_Id=mysql_query($sqlcommand,$this->_link_Id);
                                          exit($this->_query_Id);//print it to check if it is available.
        if(!$this->_query_Id)
                                                exit("Query failed");
        $this->_rowNum=mysql_affected_rows();
    }
    public function getRow()
    {
        if($this->_rowNum)
        {
                                                return mysql_fetch_assoc($this->_query_Id);
        }
    }
    public function getAllRows()
    {
        $arr=array();
        $count=0;
        while($count<$this->_rowNum)
        {
                                                array_push($arr,$this->GetRow());
                                                $count++;
        }
        return $arr;
    }
                    public function getAffectedRowsNumber()
                    {
                        return $this->_rowNum;
                    }
}   
?>

addslashes() function is the problem

答

The problem is in the public function query($sqlcommand) you did not start connection in the scope. you should start connect() in function query($sqlcommand)

在php中连接到mysql时，query_id没有返回任何内容

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