mysqli_query（）返回的東西不是一個對象

我似乎有這個代碼的問題，即時嘗試使用mysqli_connect（）和mysqli_query（）查詢數據庫，但代碼不返回一個mysqli對象和我不知道爲什麼。我做了我自己的代碼來格式化查詢，我確定沒有失敗，因爲我每次檢查：（即時通訊使用XAMPP，使用本地主機進行測試），難道是因爲安裝的PHP已損壞？）mysqli_query（）返回的東西不是一個對象

<?php 
//error_reporting(~E_ALL); 

require 'errorReporting.php'; 

$mysqli_host = 'localhost'; 
$mysqli_user = 'root'; 
$mysqli_pass = NULL; 
$mysqli_name = 'gsistel'; 

$mysqli_link = mysqli_connect($mysqli_host, $mysqli_user, $mysqli_pass, $mysqli_name) or die('SQL ERROR COULD NOT CONNECT TO DB'); 

mysqli_select_db($mysqli_link, $mysqli_name) or die('SQL ERROR COULD NOT SELECT DB'); 

function fQuery($table, $operation, $selectionColumns, $iouValues, $whereColumns, $whereValues, $orderBy, $orderClause) { 
    $operation = strtoupper($operation); 
    switch($operation) { 
     case 'SELECT': 
      global $mysqli_link; 
      $mysqli_query = 'SELECT '; 
      $selection = ''; 

      for($i = 0; $i < count($selectionColumns); $i++) {     
       if(count($selectionColumns) == 1) { 
        $selection = $selectionColumns[0]; 
       }else if($i == count($selectionColumns)-1) { 
        $selection = $selection . $selectionColumns[$i]; 
       }else { 
        $selection = $selection . $selectionColumns[$i] . ', '; 
       } 
      } 
      $mysqli_query = $mysqli_query . $selection . ' FROM ' . $table . ' '; 

      $whereSelection = ''; 
      if($whereColumns != null && (count($whereColumns == count($whereValues)))) {     
       $mysqli_query = $mysqli_query . ' WHERE '; 
       for($i = 0; $i < count($whereColumns); $i++) { 
        if(count($whereColumns) == 1) { 
         $whereSelection = $whereColumns[0] . '=\'' . $whereValues[0] . '\''; 
        }else if($i == 0){ 
         $whereSelection = $whereSelection . $whereColumns[$i] . '=\'' . $whereValues[$i] . '\''; 
        }else { 
         $whereSelection = $whereSelection . ' AND ' . $whereColumns[$i] . '=\'' . $whereValues[$i] . '\''; 
        } 
       } 
       $mysqli_query = $mysqli_query . $whereSelection . ' '; 
      }   

      if($orderBy != null) { 
       $mysqli_query = $mysqli_query . ' ORDER BY ' . $orderClause; 
      }   

      return $mysqli_result = mysqli_query($mysqli_link, $mysqli_query) or die(reportFriendlyError('SQL SELECT', 'ERROR: SQL QUERY FAILED<br>' . $mysqli_query)); 

      break; 
     case 'INSERT': 
      $mysqli_query = 'INSERT INTO ' . $table . ' VALUES (';         
      for($i = 0; $i < count($iouValues); $i++) {     
       if($i == count($iouValues)-1) { 
        if(strtoupper($iouValues[$i]) == 'NULL') { 
         $mysqli_query = $mysqli_query . $iouValues[$i] . ')';       
        }else { 
         $mysqli_query = $mysqli_query . '\'' . $iouValues[$i] . '\'' . ')';       
        }      
       }else { 
        if(strtoupper($iouValues[$i]) == 'NULL') { 
         $mysqli_query = $mysqli_query . $iouValues[$i] . ', ';       
        }else { 
         $mysqli_query = $mysqli_query . '\'' . $iouValues[$i] . '\'' . ', '; 
        }      
       }     
      }    
      return $mysqli_query; 
      //TODO: Executa query 
      break; 
     case 'UPDATE': 
      $mysqli_query = 'UPDATE ' . $table . ' SET '; 
      for($i = 0; $i < count($selectionColumns); $i++) { 
       if($i == count($selectionColumns)-1) { 
        $mysqli_query = $mysqli_query . $selectionColumns[$i] . '=\'' . $iouValues[$i] . '\''; 
       }else { 
        $mysqli_query = $mysqli_query . $selectionColumns[$i] . '=\'' . $iouValues[$i] . '\', '; 
       } 
      } 

      if($whereColumns != null && (count($whereColumns) == count($whereValues))) { 
       $mysqli_query = $mysqli_query . ' WHERE '; 
       for($i = 0; $i < count($whereColumns); $i++) { 
        if($i == count($whereColumns)-1) { 
         $mysqli_query = $mysqli_query . $whereColumns[$i] . '=\'' . $whereValues[$i] . '\''; 
        }else { 
         $mysqli_query = $mysqli_query . $whereColumns[$i] . '=\'' . $whereValues[$i] . '\', '; 
        }      
       } 
      }    
      return $mysqli_query; 
      //TODO: Execute query 
      break; 
     case 'DELETE': 
      $mysqli_query = 'DELETE FROM ' . $table . ' WHERE '; 
      for($i = 0; $i < count($whereColumns); $i++) { 
       if($i == count($whereColumns)-1) { 
        $mysqli_query = $mysqli_query . $whereColumns[$i] . '=\'' . $whereValues[$i] . '\''; 
       }else { 
        $mysqli_query = $mysqli_query . $whereColumns[$i] . '=\'' . $whereValues[$i] . '\', ';      
       } 
      } 
      return $mysqli_query; 
      //TODO: execute query 
      break; 
     default: 
      return false; 
      break;   
    } 
} 

?>

即時通訊使用的代碼在這裏進行測試：的mysqli_query（）返回false以外的東西，但它不是一個mysqli的對象。我也得到警告：警告：mysqli_fetch_array（）預計參數1被mysqli_result，在C定的boolean：\ XAMPP \ htdocs中\ Guardian2 \ login.php中第19行

<?php 

require 'connect.php'; 

$mysqli_object = fQuery('users', 'SELECT', array('username'), null, array('username') , array('admin'), null, null); 

if($mysqli_object === false) { 
    echo 'FAIL'; 
} 

if(is_object($mysqli_object)) { 
    echo 'IS OBJECT';  
}else { 
    echo 'IS NOT OBJECT'; 
} 

$user = ''; 

while($row = mysqli_fetch_array($mysqli_object)) { 
    echo $user = $row['username'];  
} 

?>

來源

2013-08-20 Gabriel Matusevich

'var_dump（$ mysqli_object）'會告訴你它是什麼。這可能是一個布爾值FALSE來表示任何你餵食它的失敗。 –

$ mysqli_object包含bool（true）o.O –

但我不知道爲什麼？它不應該返回真正的SELECT查詢 –

替換：

return $mysqli_result = mysqli_query($mysqli_link, $mysqli_query) or die(reportFriendlyError('SQL SELECT', 'ERROR: SQL QUERY FAILED<br>' . $mysqli_query));

有：

$mysqli_result = mysqli_query($mysqli_link, $mysqli_query) or die(reportFriendlyError('SQL SELECT', 'ERROR: SQL QUERY FAILED<br>' . $mysqli_query)); 
return $mysqli_result;

在 case 'SELECT'分支

。

來源

2013-08-20 23:06:17 ironcito

這樣做，我總是覺得PHP有時候有點奇怪 –

mysqli_query（）返回的東西不是一個對象

回答

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