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Best practices for in-app database migration for Sqlite
...use prepared statements
sqlite3_exec([self database].sqliteHandle, [[NSString stringWithFormat:@"PRAGMA user_version = %d", DatabaseSchemaVersionLatest] UTF8String], NULL, NULL, NULL);
}
Here's [self database] method that lazily opens the database:
- (FMDatabase *)database {
if (!_databas...
How to unit test an object with database queries
...a, but applies to all OO-languages)
class Database {
public Result query(String query) {... real db here ...}
}
class MockDatabase extends Database {
public Result query(String query) {
return "mock result";
}
}
class ObjectThatUsesDB {
public ObjectThatUsesDB(Database db) {
this....
How to play with Control.Monad.Writer in haskell?
...sk for its type:
ghci> :t logNumber
logNumber :: (Show a, MonadWriter [String] m) => a -> m a
Which tells me that the inferred type is not a function that returns a particular writer, but rather anything that implements the MonadWriter type class. I can now use it:
ghci> let multWith...
How to comment out a block of Python code in Vim
...' at first column with ''. <cr>:noh<cr> just clears the search string so nothing is left highlighted when you are done.
– cdated
Sep 22 '16 at 16:06
1
...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...owever, this method is affected by intermediate-object-creation as summing strings is, right?
– Dr. Jan-Philip Gehrcke
Jan 22 '15 at 21:22
6
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How to get first character of string?
I have a string, and I need to get its first character.
16 Answers
16
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How to get current time and date in C++?
...is question gives you exactly this. If you are in doubt about how to get a string from stream, or how to properly format a time_point<>, go ahead and ask another question or google after it.
– Tarc
Jul 7 '17 at 17:02
...
Passing enum or object through an intent (the best solution)
...N 1:
public enum AwesomeEnum {
SOMETHING, OTHER;
private static final String name = AwesomeEnum.class.getName();
public void attachTo(Intent intent) {
intent.putExtra(name, ordinal());
}
public static AwesomeEnum detachFrom(Intent intent) {
if(!intent.hasExtra(name)) throw new Ill...
Select columns from result set of stored procedure
...UERY over OPENROWSET, given that OPENQUERY does not require the connection-string definition within the proc.
Note 2:
Having said all this: normally I would just use INSERT ... EXEC :) Yes, it's 10 mins extra typing, but if I can help it, I prefer not to jigger around with:
(a) quotes within qu...
Date query with ISODate in mongodb doesn't seem to work
... The mongo shell provides various methods to return the date, either as a string or as a Date object:
Date() method which returns the current date as a string.
new Date() constructor which returns a Date object using the ISODate() wrapper.
ISODate() constructor which returns a Date obje...