Print(c.fetchall()) # this stays 2, even tho there is only one row left, which works fineĬ.execute("INSERT INTO test (col1) VALUES (3)")Ĭ.execute("DELETE FROM test WHERE col1 LIKE 3")Ĭ.execute("INSERT INTO test (col1) VALUES (4)")Ĭ. This chapter will take you through the process of setting up SQLite on Windows, Linux and Mac OS X. MWE to maybe make that clearer: conn = nnect("db_problem.db")Ĭ.execute("INSERT INTO test (col1) VALUES (1)")Ĭ.execute("INSERT INTO test (col1) VALUES (2)")Ĭ.execute("DELETE FROM test WHERE col1 LIKE 1")Ĭ.execute("SELECT testID FROM test WHERE col1 LIKE 2") DQL - Data Query Language SQLite - Installation SQLite is famous for its great feature zero-configuration, which means no complex setup or administration is needed. I was wondering now, is there a way to have the database memorize every ID that was set earlier and not set the same ID twice, even when the maximum ID is deleted from the database? Change it to INSERT INTO child (e, f, g) VALUES (1, 1, 3) and it works. Your inserts are failing because there is no row (a, b) with values (1, 2). We can connect to a SQLite database using the Python sqlite3 module: import sqlite3 connection nnect('aquarium.db') import sqlite3 gives our Python. For now, we’ll consider a database that tracks the inventory of fish at a fictional aquarium. That works because deleting the most recent row leads to a lower maximum ID in the column, which makes sense to me. The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and disk I/O overhead and should be avoided if not strictly needed. SQLite databases are fully featured SQL engines that can be used for many purposes. The Column increases in value as desired, but if I delete the row with the maximum ID and then add another entry, it will receive the ID which was set already before. Introduction to SQLite ROWIDtable Whenever you create a tablewithout specifying the WITHOUT ROWIDoption, you get an implicit auto-increment column called rowid. Therefore, I’m using a column “testID integer PRIMARY KEY”. SQLite AUTOINCREMENT Summary: in this tutorial, you will learn about SQLite AUTOINCREMENTcolumn attribute and when to use it in your table. I’m starting to work with an SQL Database in python and I want to have multiple tables, where I can reference rows in each other’s table by ID.
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