![]() We call it twice to get the alter table command to fail but the program succeeds because we remove the alter table command from the sql and re-execute the updated code. In the lib folder, add a new file named sqlhelper.dart. Below is the structure of the table: The Code 1. We iterate the array executing each script. We are going to create an SQLite database called kindacode.db. ![]() SQLite engine is not a standalone process like other databases, you can link it. It is a database, which is zero-configured, which means like other databases you do not need to configure it in your system. Heres some example code where we have sql scripts in an array. SQLite is an in-process library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. The idea is to execute the sql if it exceptions on an alter table call we can find the alter table line in the sql and return the remaining lines and execute until it either succeeds or no more matching alter table lines can be found. ![]() Luckily the error message gives us all the information we need to do this. So the idea of catching an exception is acceptable and then moving on. ![]() Typically you are not going to run this in realtime or often. I am searching for a plugin or any solution that make SQLite work on flutter desktop windows app, i tried sqflite plugin and it work well with macOS desktop app but it doesnt support windows. However, the original question was to input a sql script that would be executed by a single db execute and all the solutions ( like checking to see if the column is there ahead of time ) would require the executing program either have knowledge of what tables and columns are being altered/added or do pre-processing and parsing of the input script to determine this information. So, as far as I understand I can: 1) Read db from multiple threads (SELECT) 2) Read db from multiple threads (SELECT) and write from single thread (CREATE, INSERT, DELETE) But, I read about Write-Ahead Logging that provides more concurrency as readers do not block writers and a writer does not block readers. All these answers are fine if you execute one line at a time. ![]()
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