|Title:||NAN storage problem in columns of type 'double'|
|Last Modified:||2013-03-22 23:53:17|
|Version Found In:||18.104.22.168|
anonymous added on 2013-03-22 14:04:58:
I'd like to insert NaN values into SQLite database, via System.Data.SQLite. I have Ent table with Id, StringColumn and DoubleColumn (IMPORTANT: DoubleColumn is not nullable) and I try use the following SQL statement: INSERT INTO Ent (Id, StringColumn, DoubleColumn) VALUES (1, 'NaN test', NULL) Unfortunately I get error: "Abort due to constraint violation. Ent.DoubleColumn may not be NULL". According to http://www.sqlite.org/cvstrac/tktview?tn=3060 NULL serves as NaN for not nullable double columns. I expect that I could write NaN values using the above statement and after reading them back using i.e.: 'SELECT DoubleColumn FROM Ent', I would get double.NaN. Maybe there's another method of handling NaNs, that I don't know about.
mistachkin added on 2013-03-22 23:45:07:
I've added a new connection flag that can help work around the strict type affinity checking normally imposed by System.Data.SQLite. The new connection flag is "GetAllAsText" and it will force all column values returned from the SQLiteDataReader.GetValue method to be text, even if their type affinity would suggest otherwise. Using this new flag along with the "BindAllAsText" flag, attempting to insert a NaN into the column will actually insert the literal string "NaN" and that string will be returned upon being read via the SQLiteDataReader.GetValue method. The check-in is [2cd9814a44]. This feature will appear in the upcoming 22.214.171.124 release.