default-value

I'd like some clarification on the behaviour of default values in MySQL 5.5 & 5.6. Lets say we have the following table on a MySQL 5.5 server: CREATE TABLE `test` ( `TestColumn` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ) ENGINE=INNODB DEFAULT CHARSET=utf8; I am able to run the following query without issue: INSERT INTO `test` VALUES (NULL); Which creates the following row: TestColumn 2014-02-20 14:55:05 Now if I repeat the same test on a MySQL 5.6 server, the insert fails: Error Code: 1048 Column 'TestColumn' cannot be null I understand that timestamp automatic initilisation has changed in

As title, how can I set a table's column to have the default value the current year and month, in format 'YYYYMM', like 200905 for today? Nic Gibson Please bear in mind that the formatting of the date is independent of the storage. If it's essential to you that the date is stored in that format you will need to either define a custom data type or store it as a string. Then you can use a combination of extract , typecasting and concatenation to get that format. However, I suspect that you want to store a date and get the format on output. So, something like this will do the trick for you:

Consider this example: var Field = React.createClass({ render: function () { // never renders new value... return ( <div> <input type="text" defaultValue={this.props.value || ''} /> </div> ); } }); var App = React.createClass({ getInitialState: function () { return {value: 'Hello!'}; }, changeTo: function (str) { this.setState({value: str}); }, render: function () { return ( <div> <Field value={this.state.value} /> <button onClick={this.changeTo.bind(null, 'Whyyyy?')}>Change to "Whyyyy?"</button> <button onClick={this.changeTo.bind(null, void 0)}>Change to undefined</button> </div> ); } });

I am having a very annoying issue with React and checkboxes. The application I am working with requires a list of checkboxes that represent settings that are persisted in the back-end. There is an option to restore the settings to their original state . At first, I created a component that has an object like a map of settings. Each setting has a key and a boolean value. Hence: { bubbles: true, gregory: false } Is to be represented as: <input type="checkbox" value="bubbles" checked="checked" /> <input type="checkbox" value="gregory" /> Now, it seems React is ignorant about how a checkbox is

Here I have to set the default value if the user will enter the value from the keyboard. Here is the code that user can enter value: input = int(raw_input("Enter the inputs : ")) Here the value will be assigned to a variable input after entering the value and hitting Enter . Is there any method that if we don't enter the value and directly hit the Enter key, the variable will be directly assigned to a default value, say as input = 0.025 ? input = int(raw_input("Enter the inputs : ") or "42") How does it work? If nothing was entered then raw_input returns empty string. Empty string in python is

I'm trying to test if a property has been set yet. I know that with objects that I've got: CGRect ppGoalFrame; LocalPlaySetup *localPlaySetup; and I can test if (localPlaySetup == nil) but if I attempt to test the CGRect with == nil or == NULL if (ppGoalFrame == nil) I get invalid operands to binary == (have 'CGRect' and 'void *') So is the CGRect "void", null, nil...? before it's set? Obviously I can't compare CGrect to a void pointer (I can't use ppGoalFrame == void ); is there another way to test this? The Objective-C so far is pretty easy to understand but as soon as the C looms, I get a

I'm trying to parse string as DateTime but I'm getting an error. here my code return DateTime.ParseExact("01/01/0001 12:00:00 AM", "dd/MM/yyyy HH:mm:ss tt", CultureInfo.InvariantCulture); The date and its format is got from DataBase as string and I'm trying to add it to a DataColumn DateTime data type. What's the problem? Thanks. You are trying to parse the DateTime exactly , therefore the format has to be exact DateTime.ParseExact("01/01/0001 12:00:00 AM", "dd/MM/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture); You're using ParseExact, meaning you're specifying the whole format of the date

In MS-SQL Server, is it possible to pass a parameter to a DEFAULT function, or somehow base the DEFAULT value on the values inserted in the record? You can assign a function as a DEFAULT value for a column in MS-SQL Server. Using this, I'm trying to achieve the following. For a table with study ids and patient ids, I want to automatically assign a new patient number within that study. CREATE TABLE [dbo].[PATIENT_STUDY]( [PatientStudyID] [int] IDENTITY(1,1) NOT NULL, [PatientID] [int] NOT NULL, [StudyID] [int] NOT NULL, [PatientCode] [varchar(30)] NULL, [ActiveParticipant] [tinyint] NULL -- 1