Question

我真的不知道为什么即使在绑定参数

之后我也有这个错误

 SQLSTATE[HY093]: Invalid parameter number: no parameters were bound

这是我的功能

    public function get_no_records($param){
    $query = "SELECT * FROM users_tbl WHERE username = :value";
    $this->query = $query;
    $stmt = $this->db->prepare($query);
    $stmt->bindParam(':value',$param);
    $stmt->execute();
    $row_num = $stmt->rowCount();
    if($row_num > 0){
        $this->total_rec = $row_num;
        return $row_num;
    }
}

该函数是分页类的一部分。这是类

<?php
class Paginator{
private $db;
public $page_no;//current page
public $limit;//record_per page
public $row_start;
public $total_rec;
public $query;

function __construct($con){
    $this->db = $con;
}
//get total no of records

    public function get_no_records($param){
    $query = "SELECT * FROM users_tbl WHERE username = :value";
    $this->query = $query;
    $stmt = $this->db->prepare($query);
    $stmt->bindParam(':value',$param);
    $stmt->execute();
    $row_num = $stmt->rowCount();
    if($row_num > 0){
        $this->total_rec = $row_num;
        return $row_num;
    }
}
public function get_data($limit,$page_no){
    try {
        $this->limit = $limit;
        $this->page_no = $page_no;
        if($this->limit == "all"){
            $query = $this->query;
        }
        else{
            $this->row_start = (($this->page_no-1) * $this->limit);
            $query = $this->query . " LIMIT ". $this->row_start . "," . $this->limit;
        }
        $stmt = $this->db->prepare($query);
        $stmt->execute();
        while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
            //create an array to hold record
            $results[] = $row;
        }
        $result = new stdClass();
        $result->page_no = $this->page_no;
        $result->limit = $this->limit;
        $result->total_rec = $this->total_rec;
        $result->data = $results;
        return $result;
    } catch (PDOException $e) {
        echo $e->getMessage();
    }
}
public function create_links($links,$list_class){
    if($this->limit == 'all'){
        return '';
    }
    $last = ceil($this->total_rec/$this->limit);
    $start = (($this->page_no - $links) > 0) ? $this->page_no - $links : 1;
    $end = (($this->page_no + $links) < $last) ? $this->page_no + $links : $last;
    $html = '<ul class="' . $list_class . '">';
    $class = ($this->page_no == 1) ? "disabled" : "";
    $previous_page = ($this->page_no == 1) ?
    '<a href= ""><li class="' . $class . '">&laquo;</a></li>' :
    '<li class="' . $class . '"><a href="?limit=' . $this->limit . '&page_no=' . ($this->page_no-1) . '">&laquo;</a></li>';
    $html .= $previous_page;
    if($start > 1){
        $html .= '<li><a href="?limit=' . $this->limit . '&page_no=1">1</a></li>';
        $html .= '<li class="disabled"><span>....</span></li>'; 
    }
    for($i = $start;$i<=$end;$i++){
        $class = ($this->page_no == $i)? "active" : "";
        $html .= '<li class="' . $class . '"><a href="?limit=' . $this->limit . '&page_no=' . $i .'">' . $i . '</a></li>';
    }
    if( $end < $last){
        $html .= '<li class="disabled"><span>....</span></li>';
        $html .= '<li><a href="?limit=' . $this->limit . '&page_no=' . $last . '">' . $last . '</a></li>';
    }
    $class = ($this->page_no == $last)? "disabled" : "";

    $next_page = ( $this->page_no == $last)?
    '<li class="' . $class . '"><a href="">&raquo;</a></li>':
    '<li class="' . $class . '"><a href="?limit=' . $this->limit . '&page_no=' . ($this->page_no + 1) . '">&raquo;</a></li>';
    $html .= $next_page;
    $html .= '</ul>';
    return $html;
}

} ？＆GT;

Answer 1

谢谢大家。我得到了错误的来源，它的get_data（），因为该函数还包含一个查询，一个值也必须绑定。这是我的新代码。

<?php
class Paginator{
private $db;
public $page_no;//current page
public $limit;//record_per page
public $row_start;
public $total_rec;
public $query;

function __construct($con){
    $this->db = $con;
}
//get total no of records
public function get_no_records($query,$value){
    $this->query = $query;
    $stmt = $this->db->prepare($query);
    $stmt->bindParam(':value',$value);
    $stmt->execute();
    $row_num = $stmt->rowCount();
    if($row_num > 0){
        $this->total_rec = $row_num;
        return $row_num;
    }
}
public function get_data($limit,$page_no,$value){
    try {
        $this->limit = $limit;
        $this->page_no = $page_no;
        if($this->limit == "all"){
            $query = $this->query;
        }
        else{
            $this->row_start = (($this->page_no-1) * $this->limit);
            $query = $this->query . " LIMIT ". $this->row_start . "," . $this->limit;
        }
        $stmt = $this->db->prepare($query);
        $stmt->bindParam('value',$value);
        $stmt->execute();
        while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
            //create an array to hold record
            $results[] = $row;
        }
        if(empty($results)){
            return;
        }
        $result = new stdClass();
        $result->page_no = $this->page_no;
        $result->limit = $this->limit;
        $result->total_rec = $this->total_rec;
        $result->data = $results;
        return $result;
    } catch (PDOException $e) {
        echo $e->getMessage();
    }
}
public function create_links($links,$list_class){
    if($this->limit == 'all'){
        return '';
    }
    $last = ceil($this->total_rec/$this->limit);
    $start = (($this->page_no - $links) > 0) ? $this->page_no - $links : 1;
    $end = (($this->page_no + $links) < $last) ? $this->page_no + $links : $last;
    $html = '<ul class="' . $list_class . '">';
    $class = ($this->page_no == 1) ? "disabled" : "";
    $previous_page = ($this->page_no == 1) ?
    '<a href= ""><li class="' . $class . '">&laquo;</a></li>' :
    '<li class="' . $class . '"><a href="?limit=' . $this->limit . '&page_no=' . ($this->page_no-1) . '">&laquo;</a></li>';
    $html .= $previous_page;
    if($start > 1){
        $html .= '<li><a href="?limit=' . $this->limit . '&page_no=1">1</a></li>';
        $html .= '<li class="disabled"><span>....</span></li>'; 
    }
    for($i = $start;$i<=$end;$i++){
        $class = ($this->page_no == $i)? "active" : "";
        $html .= '<li class="' . $class . '"><a href="?limit=' . $this->limit . '&page_no=' . $i .'">' . $i . '</a></li>';
    }
    if( $end < $last){
        $html .= '<li class="disabled"><span>....</span></li>';
        $html .= '<li><a href="?limit=' . $this->limit . '&page_no=' . $last . '">' . $last . '</a></li>';
    }
    $class = ($this->page_no == $last)? "disabled" : "";

    $next_page = ( $this->page_no == $last)?
    '<li class="' . $class . '"><a href="">&raquo;</a></li>':
    '<li class="' . $class . '"><a href="?limit=' . $this->limit . '&page_no=' . ($this->page_no + 1) . '">&raquo;</a></li>';
    $html .= $next_page;
    $html .= '</ul>';
    return $html;
}
}
?>

在执行查询之前，get_data（）中的查询现在有一个$ value的参数。

Answer 2

我不使用bind param而只使用execute语句。

public function get_no_records($param)
{
    $query = "SELECT * FROM users_tbl WHERE username = :my_value;";
    $this->query = $query; //What use do I have?
    $stmt = $this->db->prepare($query);

    $stmt->execute(array(':my_value' => $param));

    $row_num = $stmt->rowCount();
    if($row_num > 0)
    {
        $this->total_rec = $row_num;
        return $row_num;
    }

    return 0; //Added so the function always has a return value
}

':value'的绑定是通过创建一个仅用作执行函数参数的关联数组来完成的。

绑定参数PDO准备好的声明

2 个答案: