add

python/examples/sqlite/sql_autoincrement.py

@@ -0,0 +1,54 @@
+import sqlite3
+
+
+def insert(conn, crs, username):
+    sql = 'INSERT INTO people (username) VALUES (?)'
+    try:
+        crs.execute(sql, (username,))
+    except sqlite3.IntegrityError as err:
+        print('sqlite error: ', err.args[0])
+    conn.commit()
+
+
+def list_rows(conn, crs):
+    sql = "SELECT * FROM people"
+    for id, username in crs.execute(sql):
+        print(f"{id} - {username}")
+
+
+def create_table(conn, crs):
+    sql = '''
+        CREATE TABLE people (
+           id        INTEGER PRIMARY KEY AUTOINCREMENT,
+           username  VARCRCHAR(100) UNIQUE NOT NULL
+    );
+    '''
+
+    try:
+        crs.execute(sql)
+    except sqlite3.OperationalError as err:
+        print(f'sqlite error: {err.args[0]}')  # table companies already exists
+    conn.commit()
+
+def main():
+    conn = sqlite3.connect(":memory:")
+    crs = conn.cursor()
+    create_table(conn, crs)
+
+    insert(conn, crs, "rachel")
+    list_rows(conn, crs)
+
+    insert(conn, crs, "joey")
+    list_rows(conn, crs)
+
+    insert(conn, crs, "monica")
+    list_rows(conn, crs)
+
+    insert(conn, crs, "monica")
+    list_rows(conn, crs)
+
+    conn.close()
+    print('done')
+
+
+main()

python/sqlite.md

@@ -72,9 +72,15 @@ If the result set might be empty, then the fetchone might return None. Check for
 
 ![](examples/sqlite/sql_update.py)
 
-
 ## A counter
 {id: sqlite-counter}
 
 ![](examples/sqlite/counter.py)
 
+## SQLite in-memory AUTOINCREMENT
+{id: sqlite-in-memory-autoincrement}
+{i: AUTOINCREMENT}
+{i: :memory:}
+
+![](examples/sqlite/sql_autoincrement.py)
+