You ask: Is there a command that can change this maximum length? Is this length the same for other names (columns, tables etc)? The manual answers here: The system uses no more than NAMEDATALEN-1 bytes of an identifier; longer names can be written in commands, but they will be truncated. By default, NAMEDATALEN is 64 … Read more
Nowadays with C# 7.0 the _ does have significance sometimes. It became the discard operator for the new out var feature. It is used when a function returns a value and you want to notify the compiler that you won’t be using it – so it can be optimized out. Or when deconstructing (Another C# … Read more
(I think it’s pretty cool too, that might mean we’re geeks.) You’re fine to do this with the code you have above in Python 3. (It works in my Python 3.1 interpreter at least.) See: http://docs.python.org/py3k/reference/lexical_analysis.html#identifiers http://www.python.org/dev/peps/pep-3131/ But in Python 2, identifiers can only be ASCII letters, numbers and underscores. http://docs.python.org/reference/lexical_analysis.html#identifiers
The rules for identifiers state at the end: When identifiers are used in Transact-SQL statements, the identifiers that do not comply with these rules must be delimited by double quotation marks or brackets. By choosing a database name which does not conform to those rules, you have to enclose it always with double quotation marks … Read more
You may keep it in KeyChain -(NSString *)getUniqueDeviceIdentifierAsString { NSString *appName=[[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString*)kCFBundleNameKey]; NSString *strApplicationUUID = [SSKeychain passwordForService:appName account:@”incoding”]; if (strApplicationUUID == nil) { strApplicationUUID = [[[UIDevice currentDevice] identifierForVendor] UUIDString]; [SSKeychain setPassword:strApplicationUUID forService:appName account:@”incoding”]; } return strApplicationUUID; }
I finally discover the error. The problem is that the primary key constraint name is equal the table name. I don know how postgres represents constraints, but I think the error “Relation already exists” was being triggered during the creation of the primary key constraint because the table was already declared. But because of this … Read more
Having 2 elements with the same ID is not valid html according to the W3C specification. When your CSS selector only has an ID selector (and is not used on a specific context), jQuery uses the native document.getElementById method, which returns only the first element with that ID. However, in the other two instances, jQuery … Read more
We call them references. They work like this i = 5 # create int(5) instance, bind it to i j = i # bind j to the same int as i j = 3 # create int(3) instance, bind it to j print i # i still bound to the int(5), j bound to the … Read more
You can use header files. Good practice. You can create a file called player.h declare all functions that are need by other cpp files in that header file and include it when needed. player.h #ifndef PLAYER_H // To make sure you don’t declare the function more than once by including the header multiple times. #define … Read more
Your @Entity class has a String type for its @Id field, so it can’t generate ids for you. If you change it to an auto increment in the DB and a Long in java, and add the @GeneratedValue annotation: @Id @Column(name=”U_id”) @GeneratedValue(strategy=GenerationType.IDENTITY) private Long U_id; it will handle incrementing id generation for you.