更新的数据动态

Question

public function update($id, $table, $data, $exclude = array()){ 

    $query = "UPDATE $table SET"; 

    $fields = $values = array(); 

    if(!is_array($exclude)) $exclude = array($exclude); 
    foreach(array_keys($data) as $key) { 

     if(!in_array($key, $exclude)) { 
      $fields[] = "`$key`"; 
      $values[] = "'" . $this->db->real_escape_string($data[$key]) . "'"; 
     } 

     $fields = implode(" ", $fields); 
     $values = implode(" ", $values); 

     $query .= $fields . "=" . $values . ","; 

    } 

    $query = $query . "WHERE id = '".$id."' "; 


     if(!$this->db->query($query)){ 
     echo "Something wrong with query "; 

     } 
     else{ 
     echo "successfully updated"; 
     } 

    } 

遇到错误

Fatal error: [] operator not supported for strings 

从中工作的附加功能，调整了代码。希望在不使用变量的情况下动态更新字段和值，例如$ _POST ['address']。

$query .= $fields . "=" . $values . ", "; 

似乎没有工作。不知道是什么导致了错误：致命错误：[]运算符不支持字符串。如何在sql查询中插入field = value？

Answer 1

使用这样

if(!is_array($exclude)) $exclude = array($exclude); 
    foreach(array_keys($data) as $key) { 
     if(!in_array($key, $exclude)) { 
      $query .= $key . "='" . $data[$key] . "' ,"; 
     } 
    } 
    $query = substr($query,0,strlen($query)-1); 

    $query = $query . " WHERE id = '".$id."' "; 

Answer 2

看看foreach循环！

foreach(array_keys($data) as $key) { 

    if(!in_array($key, $exclude)) { 
     $fields[] = "`$key`"; 
     $values[] = "'" . $this->db->real_escape_string($data[$key]) . "'"; 
    } 

    $fields = implode(" ", $fields); // Mistake done here 
    $values = implode(" ", $values); // Mistake done here 

    $query .= $fields . "=" . $values . ","; 

} 

改变你的那两条线和循环外的下一条线。可能是这个解决你的问题。

foreach(array_keys($data) as $key) { 
    if(!in_array($key, $exclude)) { 
     $fields[] = "`$key`"; 
     $values[] = "'" . $this->db->real_escape_string($data[$key]) . "'"; 
    }  
} 
$fields = implode(" ", $fields); 
$values = implode(" ", $values); 
$query .= $fields . "=" . $values . ","; 

Answer 3

按照我的代码。哪里不需要实现implode()函数。我改变了你的功能代码。尝试一下。

public function update($id, $table, $data, $exclude = array()){ 

    $query = "UPDATE $table SET"; 

    $fields = $values = array(); 

    if(!is_array($exclude)) $exclude = array($exclude); 
    foreach(array_keys($data) as $key) { 

     if(!in_array($key, $exclude)) { 
      $queryArr[] = $key . "='" . $this->db->real_escape_string($data[$key]);     
     } 
    } 
    $query = implode(" ,", $queryArr); 

    $query = $query . "WHERE id = '".$id."' ";  

     if(!$this->db->query($query)){ 
     echo "Something wrong with query "; 

     } 
     else{ 
     echo "successfully updated"; 
     } 

    }