Question

我有DELETE查询，我想返回执行结果。我该怎么办？

我的PHP代码：

Function delete_cat($category){
    $stmt = $mysqli->prepare("DELETE category, products FROM category INNER JOIN products WHERE category.id = ? AND product_cat = category.category_name ");
    $stmt->bind_param($category);
    $stmt->execute();
    $stmt->close();
//return should be here

}

Answer 1

所以class ToolInputViewSet(viewsets.ModelViewSet): ''' Describes a Tool input. ''' lookup_field = 'id' serializer_class = StandaloneToolInputSerializer def get_queryset(self): tool_id = self.kwargs['tool_id'] return ToolInput.objects.filter(tool_id=tool_id) def create(self, request, *args, **kwargs): request.data["tool"] = self.kwargs['tool_id'] return super(ToolInputViewSet, self).create(request, *args, **kwargs) def update(self, request, *args, **kwargs): request.data["tool"] = self.kwargs['tool_id'] return super(ToolInputViewSet, self).update(request, *args, **kwargs) =＆gt;返回一个bool值，无论你的查询是否成功执行，你都可以这样做：

$stmt->execute();

如果您需要获取已删除元素的计数，可以使用mysqli_stmt_affected_rows，如下所示：

function delete_cat($category){
    $stmt = $mysqli->prepare("DELETE category, products FROM category INNER JOIN products WHERE category.id = ? AND product_cat = category.category_name ");
    $stmt->bind_param($category);
    $result = $stmt->execute();
    $stmt->close();
   return $result;
}

Answer 2

function delete_cat($category){
    $stmt = $mysqli->prepare("DELETE category, products FROM category INNER JOIN products WHERE category.id = ? AND product_cat = category.category_name ");
    $stmt->bind_param($category);
    $result = $stmt->execute(); // store the return of the method into a variable here so we can return it later
    $stmt->close();
    return $result // would return if the rows have been deleted or not.
    return $mysqli->affected_rows; // would return the amount of rows deleted

}

如果要获取已删除的行数，请使用affected_rows，如果要在SQL查询成功执行时获取结果，只需存储$stmt->execute的返回值变成一个变量然后返回。

http://php.net/manual/en/mysqli-stmt.affected-rows.php

http://php.net/manual/de/mysqli-stmt.execute.php

返回Mysqli execute（）的结果

2 个答案: