glofert.blogg.se - Sqlite autoincrement id python

Sqlite autoincrement id python update#
Sqlite autoincrement id python code#
Sqlite autoincrement id python professional#

execute ( 'CREATE TABLE url (id INTEGER PRIMARY KEY, url TEXT, count INTEGER) ' ) cursor. SELECT 'Project - '||ProjectNumber AS ProjectNumber, Title, 'DR'||printf('%07d',DrawingID) AS DrawingID FROM Drawing ORDER BY ProjectNumber,DrawingId * Extracting Project, Drawing Title and Drawing ID */ INSERT INTO Drawing (Title,ProjectNumber) VALUES Then rebuild the ID and return it to the OnSave function.Īs an example consider the following :- /* Cleanup in case existing Environment exists */ĬREATE TABLE IF NOT EXISTS Drawing (DrawingID INTEGER PRIMARY KEY, Title TEXT, ProjectNumber INTEGER) Of course you then don't have the additional inefficiency of trying to replicate this inbuilt behaviour by So I need to split the string, convert it to an Integer and add +1.

Using an alias of the rowid will be more efficient not only as the value stored is shorter (maximum of 8 bytes), it is stored in the most efficient (up to twice as fast as other indexes) index.

However, there is no guarantee that the unique value will be 1 greater or that if when (if) you reached the maximum number of 9223372036854775807 (basically impossible due to storage device capacity) that a lower (but still unique) number will be assigned.

This is typically 1 greater than the highest with the first value as 1. When inserting a row and you don't sepcify a value for the column then a unique value is supplied. To further elaborate if DrawingID is defined using INTEGER PRIMARY KEY the column is then an alias of the normally hidden rowid (if not a WITHOUT ROWID table (rarely used)). You also don't need to check calculate the next number as SQlite can do this on your behalf. That is you can add DR when extracting the value. Really you don't need DR to be stored as it's a user convenience.

Wx.MessageBox("Couldn't create new Drawing entry!", "Info", wx.OK | wx.ICON_INFORMATION) Wx.MessageBox("Couldn't get new Drawing ID!", "Info", wx.OK | wx.ICON_INFORMATION)Ĭ.execute("INSERT into Drawing (DrawingID,Titel,ProjectNumber) values (?,?,?)", (userID,titel,project_number)) New_drawing_id = "DR"+str(int(recent_drawing_id)+1).zfill(len(recent_drawing_id))

Sqlite autoincrement id python code#

Here is the Code we used up to this point: def GetID(self):Ĭ.execute("SELECT DrawingID FROM Drawing LIMIT 1 OFFSET (SELECT COUNT(*) FROM Drawing)-1")

Sqlite autoincrement id python professional#

I really think this isn't a professional way to do this and I want to learn the correct way.ģ.

I think the time between getting the recent ID and saving the new one to the DB is susceptible to errors like double usage of IDs.

Then if false is not returned I start the save process. Then rebuild the ID and return it to the OnSave function. So I need to split the string, convert it to an Integer and add +1. Our Drawing IDs look like this "DR0000001".

Therefore it has a function GetID to get the latest ID and create a new one from it.

It saves the ID, Title and Project Number of the Drawing in a SQLite Database.

I think the code I have has some problems, but I am quite unsure so I hope to get feedback and criticism from you all! 1.

Sqlite autoincrement id python update#

The code is written in Python and I need to update it. At our company we use an SQLite Database to manage our Drawing IDs (CAD Drawings).