default-value

问题 I have a table where I have an auto increment column id and another column ord . My goal is to have a 'default' value for ord that is id . I am using a trigger (see below), but it always uses 0 instead of the id value. When I remove the auto_increment from id , it works as it should. How can I set the 'default' value of a field to the one of an auto_increment field? Table CREATE TABLE IF NOT EXISTS `mytable` ( `id` int(11) NOT NULL AUTO_INCREMENT, `ord` int(11) DEFAULT NULL, PRIMARY KEY (`id`

问题 I have a table where I have an auto increment column id and another column ord . My goal is to have a 'default' value for ord that is id . I am using a trigger (see below), but it always uses 0 instead of the id value. When I remove the auto_increment from id , it works as it should. How can I set the 'default' value of a field to the one of an auto_increment field? Table CREATE TABLE IF NOT EXISTS `mytable` ( `id` int(11) NOT NULL AUTO_INCREMENT, `ord` int(11) DEFAULT NULL, PRIMARY KEY (`id`

问题 Hi I have problem to be solved.I read data from database setting data to text value in javascript .But the value data does not seen in page correctly.For example if the value is equal to value="hello friends " only "hello" is seen . How can I solve this problem. Here is code :- <input type=" + "text" + " value="+login+" id=" + Type + " name=" + Type + " size=" + "40" + " maxlength=" + "200" + " /> show data:- <input type=text value=Lütfen kullanıcı adınızı girin id=Kullanıcı Girisi name

问题 I was wondering if it is possible to change the default value for a built-in function in R? I have found some questions about setting default values for user made functions in R, but not for built-in functions. Why do I want this? To be honest, it is purely a matter of convenience. Sometimes I write my results/data to a .csv file to make some quick graphs in Excel. To do this I use the write.csv function. One of the defaults in this function is row.names = TRUE . So far, I have never wanted

问题 I have a model called Fattura, and I would like to set the default value of the field "printable" to a string that includes the value of the field "numero". But I have the error that link_fattura has less arguments, but if I add default=link_fattura(self) I have an error because self is not defined. How can I solve this issue? class Fattura(models.Model): def link_fattura(self, *args, **kwargs): return u"http://127.0.0.1:8000/fatture/%s/" % (self.numero) data = models.DateField() numero =

问题 I want to define a function with some optional arguments, let's say A (mandatory) and B (optional). When B is not given, I want it to take the same value as A. How could I do that? I have tried this, but it doesn't work (name 'B' is not defined): def foo(A, B=A): do_something() I understand that the values of the arguments are not assigned before the body of the function. 回答1: You shall do this inside of your function. Taking your original function: def foo(A, B=A): do_something() try

问题 I have below input JSON : { "id": "2ef8a2ee-054f-4b43-956a-8aa4f51a41d5", "type": "VOICE", "tags": [ { "id": "some id 1", "description": "some description 1" }, { "id": "some id 2", "description": "some description 2" } ], "transcription": { "key1": "val1", "key2": "val2" } } But, output JSON should look like similarly, and add only default values: { "id": "2ef8a2ee-054f-4b43-956a-8aa4f51a41d5", "created": "2019-06-18T18:12:37", "firstName": "Khusan", "lastName": "Sharipov", "status": "OPEN"

问题 I have an html select that is populated with DATA from a query using a foreach loop. It looks something like this $client = $wpdb->get_results("SELECT string FROM `file` WHERE `code` = 002 AND `status` = 2"); echo 'Filter by client: '; echo '<select name="client_list">'; foreach ($client as $key => $row) { $value = $row->string; echo '<option value='.$value.'>' .$value. '</option>'; } $client = $_GET['client_list']; echo '</select>'; It serves as a filter to display data based on the selected

问题 How can I remove the default value that is added by default to the textboxes of non nullable properties when using the EditFor helper? I don't want that behavior EDIT Sorry I didn't give enough information. For example if you use Html.EditorFor with a property that is DateTime it will set the textbox value to 1/1/0001 automatically. If you use "DateTime?"(nullable), it won't, it just leaves the textbox empty. 回答1: You can use UIHint to do it. Create a file called ShortDate.cshtml in

问题 I don't know. Simply I don't know. Why does the second codeblock work and check the checkboxes by default, but the first block isn't? I need to pre-check bitmask flags and I can't/don't want to append strings or something. // THIS isn't working?!! $test1 = array( 2 => 'tomato', 4 => 'bitmask problem' ); $test2 = array(2, 4); $form->addElement('multiCheckbox', 'flags', array( 'label' => 'Flags', 'value' => $test2, 'multiOptions' => $test1, ) ); // THIS IS WORKING: $form->addElement (