Getting "Database is Locked" when trying to move a list of records from one table to another table in SQLite - vb.net

Question

I have a Public Sub to move a collection of records from one table to another in the same SQLite database. First it reads a record from strFromTable, then writes it to strToTable, then deletes the record from strFromTable. To speed things up, I've loaded the entire collection of records into a transaction. When the list involves moving a lot of image blobs, the db gets backed up, and throws the exception "The Database is Locked". I think what is happening is that it's not finished writing one record before it starts trying to write the next record. Since SQLite only allows one write at a time, it thows the "Locked" exception.
Here is the code that triggers the error when moving a lot of image blobs:
Using SQLconnect = New SQLiteConnection(strDbConnectionString)
SQLconnect.Open()
Using tr = SQLconnect.BeginTransaction()
Using SQLcommand = SQLconnect.CreateCommand
For Each itm As ListViewItem In lvcollection
SQLcommand.CommandText = $"INSERT INTO {strToTable} SELECT * FROM {strFromTable} WHERE id = {itm.Tag}; DELETE FROM {strFromTable} WHERE ID = {itm.Tag};"
SQLcommand.ExecuteNonQuery()
Next
End Using
tr.Commit()
End Using
End Using
When I get rid of the transaction, it executes without error:
Using SQLconnect = New SQLiteConnection(strDbConnectionString)
SQLconnect.Open()
Using SQLcommand = SQLconnect.CreateCommand
For Each itm As ListViewItem In lvcollection
SQLcommand.CommandText = $"INSERT INTO {strToTable} SELECT * FROM {strFromTable} WHERE id = {itm.Tag}; DELETE FROM {strFromTable} WHERE ID = {itm.Tag};"
SQLcommand.ExecuteNonQuery()
Next
End Using
End Using
I'm not very good with DB operations, so I'm sure there is something that needs improvement. Is there a way to make SQLite completely finish the previous INSERT before executing the next INSERT? How can I change my code to allow using a transaction?
Thank you for your help.
.

Answer 1

Ok ... here is the solution that I decided to go with. I hope this helps someone finding this in a search:
Dim arrIds(lvcollection.Count - 1) As String
Dim i as Integer = 0
' Load the array with all the Tags in the listViewCollection
For i = 0 to lvcollection.Count - 1
arrIds(i) = lvcollection(i).Tag 'item.Tag holds the Primary Key "id" field in the DB
Next
'build a comma-space separated string of all ids from the array of ids.
Dim strIds as String = String.Join(", ", arrIds)
Using SQLconnect = New SQLiteConnection(strDbConnectionString)
SQLconnect.Open()
Using tr = SQLconnect.BeginTransaction()
Using SQLcommand = SQLconnect.CreateCommand
SQLcommand.CommandText = $"INSERT INTO {strToTable} SELECT * FROM {strFromTable} WHERE id IN ({strIds});"
SQLcommand.ExecuteNonQuery()
SQLcommand.CommandText = $"DELETE FROM {strFromTable} WHERE ID IN ({strIds});"
SQLcommand.ExecuteNonQuery()
End Using
tr.Commit()
End Using
End Using
The IN statement allows me to pass all of the "id" values to be deleted as a batch. This solution is faster and more secure than doing them one by one with no transaction.
Thanks for the comments, and best wishes to everyone in their coding.