mysql_num_rows（）错误

Question

我在Drupal用下面的代码显示可编辑的表格

function _MYMODULE_sql_to_table($sql) { 
    $html = "";  
    // execute sql 
    $resource = db_query($sql);  
    // fetch database results in an array 
    $results = array(); 
    while ($row = db_fetch_array($resource)) { 

    $results[] = $row; 
     $id = $row['id']; 
     $email = $row['email']; 
     $comment = $row['comment']; 
//  drupal_set_message('Email: '.$email. ' comment: '.$comment. ' id: '.$id); 
    } 
    // ensure results exist 
    if (!count($results)) { 
    $html .= "Sorry, no results could be found."; 
    return $html;  
    } 

    // create an array to contain all table rows 
    $rows = array(); 
    // get a list of column headers 
    $columnNames = array_keys($results[0]); 

    // loop through results and create table rows 
    foreach ($results as $key => $data) { 
    // create row data 
    $row = array(

    'edit' => l(t('Edit'),"admin/content/test/".$data['id']."/ContactUs", $options=array()),); 

    // loop through column names 
    foreach ($columnNames as $c) { 
     $row[] = array(
     'data' => $data[$c], 
     'class' => strtolower(str_replace(' ', '-', $c)), 
    ); 
    } 

    // add row to rows array 
    $rows[] = $row; 

    } 

    // loop through column names and create headers 
    $header = array(); 
    foreach ($columnNames as $c) { 
    $header[] = array(
     'data' => $c, 
     'class' => strtolower(str_replace(' ', '-', $c)), 
    ); 
    } 

    // generate table html 
    $html .= theme('table', $header, $rows); 

    return $html; 

} 

// then you can call it in your code... 
function _MYMODULE_some_page_callback() { 

    $html = ""; 

    $sql = "select * from {contact3}"; 

    $html .= _MYMODULE_sql_to_table($sql); 

    return $html; 
} 

不过，我不断收到mysql_num_rows（）误差

警告：mysql_num_rows（）：提供参数不是有效的MySQL结果资源。是什么造成的？

Answer 1

您正在使用哪个版本的Drupal？

尝试db_affected_rows()

或db_num_rows()