bpo-34580: Update sqlite3 examples to call close() explicitly (GH-9079)

The sqlit3.Connection object doesn't call its close() method when it's used
as a context manager.

Doc/includes/sqlite3/adapter_datetime.py

@@ -13,3 +13,5 @@ cur = con.cursor()
 now = datetime.datetime.now()
 cur.execute("select ?", (now,))
 print(cur.fetchone()[0])
+
+con.close()

Doc/includes/sqlite3/adapter_point_1.py

@@ -14,3 +14,5 @@ cur = con.cursor()
 p = Point(4.0, -3.2)
 cur.execute("select ?", (p,))
 print(cur.fetchone()[0])
+
+con.close()

Doc/includes/sqlite3/adapter_point_2.py

@@ -15,3 +15,5 @@ cur = con.cursor()
 p = Point(4.0, -3.2)
 cur.execute("select ?", (p,))
 print(cur.fetchone()[0])
+
+con.close()

Doc/includes/sqlite3/connect_db_1.py

-import sqlite3
-
-con = sqlite3.connect("mydb")

Doc/includes/sqlite3/connect_db_2.py

-import sqlite3
-
-con = sqlite3.connect(":memory:")

Doc/includes/sqlite3/countcursors.py

@@ -13,3 +13,5 @@ con = sqlite3.connect(":memory:", factory=CountCursorsConnection)
 cur1 = con.cursor()
 cur2 = con.cursor()
 print(con.numcursors)
+
+con.close()

Doc/includes/sqlite3/ctx_manager.py

@@ -14,3 +14,7 @@ try:
         con.execute("insert into person(firstname) values (?)", ("Joe",))
 except sqlite3.IntegrityError:
     print("couldn't add Joe twice")
+
+# Connection object used as context manager only commits or rollbacks transactions,
+# so the connection object should be closed manually
+con.close()

Doc/includes/sqlite3/execsql_fetchonerow.py

@@ -15,3 +15,5 @@ for (name_last, age) in cur:
 cur.execute(SELECT)
 for row in cur:
     print('%s is %d years old.' % (row[0], row[1]))
+
+con.close()

Doc/includes/sqlite3/execsql_printall_1.py

@@ -11,3 +11,5 @@ cur.execute("select * from people order by age")
 
 # Retrieve all rows as a sequence and print that sequence:
 print(cur.fetchall())
+
+con.close()

Doc/includes/sqlite3/execute_1.py

@@ -14,3 +14,5 @@ cur.execute("insert into people values (?, ?)", (who, age))
 cur.execute("select * from people where name_last=:who and age=:age", {"who": who, "age": age})
 
 print(cur.fetchone())
+
+con.close()

Doc/includes/sqlite3/execute_3.py

-import sqlite3
-
-con = sqlite3.connect("mydb")
-
-cur = con.cursor()
-
-who = "Yeltsin"
-age = 72
-
-cur.execute("select name_last, age from people where name_last=:who and age=:age",
-    locals())
-print(cur.fetchone())

Doc/includes/sqlite3/executemany_1.py

@@ -22,3 +22,5 @@ cur.executemany("insert into characters(c) values (?)", theIter)
 
 cur.execute("select c from characters")
 print(cur.fetchall())
+
+con.close()

Doc/includes/sqlite3/executemany_2.py

@@ -13,3 +13,5 @@ cur.executemany("insert into characters(c) values (?)", char_generator())
 
 cur.execute("select c from characters")
 print(cur.fetchall())
+
+con.close()

Doc/includes/sqlite3/executescript.py

@@ -22,3 +22,4 @@ cur.executescript("""
         1987
     );
     """)
+con.close()

Doc/includes/sqlite3/insert_more_people.py

@@ -14,3 +14,5 @@ for person in newPeople:
 
 # The changes will not be saved unless the transaction is committed explicitly:
 con.commit()
+
+con.close()

Doc/includes/sqlite3/load_extension.py

@@ -24,3 +24,5 @@ con.executescript("""
     """)
 for row in con.execute("select rowid, name, ingredients from recipe where name match 'pie'"):
     print(row)
+
+con.close()

Doc/includes/sqlite3/md5func.py

@@ -9,3 +9,5 @@ con.create_function("md5", 1, md5sum)
 cur = con.cursor()
 cur.execute("select md5(?)", (b"foo",))
 print(cur.fetchone()[0])
+
+con.close()

Doc/includes/sqlite3/mysumaggr.py

@@ -18,3 +18,5 @@ cur.execute("insert into test(i) values (1)")
 cur.execute("insert into test(i) values (2)")
 cur.execute("select mysum(i) from test")
 print(cur.fetchone()[0])
+
+con.close()

Doc/includes/sqlite3/parse_colnames.py

@@ -6,3 +6,5 @@ cur = con.cursor()
 cur.execute('select ? as "x [timestamp]"', (datetime.datetime.now(),))
 dt = cur.fetchone()[0]
 print(dt, type(dt))
+
+con.close()

Doc/includes/sqlite3/pysqlite_datetime.py

@@ -18,3 +18,5 @@ cur.execute('select current_date as "d [date]", current_timestamp as "ts [timest
 row = cur.fetchone()
 print("current_date", row[0], type(row[0]))
 print("current_timestamp", row[1], type(row[1]))
+
+con.close()

Doc/includes/sqlite3/row_factory.py

@@ -11,3 +11,5 @@ con.row_factory = dict_factory
 cur = con.cursor()
 cur.execute("select 1 as a")
 print(cur.fetchone()["a"])
+
+con.close()

Doc/includes/sqlite3/rowclass.py

@@ -10,3 +10,5 @@ for row in cur:
     assert row["name"] == row["nAmE"]
     assert row[1] == row["age"]
     assert row[1] == row["AgE"]
+
+con.close()

Doc/includes/sqlite3/shortcut_methods.py

@@ -18,3 +18,7 @@ for row in con.execute("select firstname, lastname from person"):
     print(row)
 
 print("I just deleted", con.execute("delete from person").rowcount, "rows")
+
+# close is not a shortcut method and it's not called automatically,
+# so the connection object should be closed manually
+con.close()

Doc/includes/sqlite3/simple_tableprinter.py

@@ -24,3 +24,5 @@ for row in cur:
         print(fieldValue.ljust(FIELD_MAX_WIDTH), end=' ')
 
     print() # Finish the row with a newline.
+
+con.close()

Doc/includes/sqlite3/text_factory.py

@@ -25,3 +25,5 @@ con.text_factory = lambda x: x.decode("utf-8") + "foo"
 cur.execute("select ?", ("bar",))
 row = cur.fetchone()
 assert row[0] == "barfoo"
+
+con.close()

Doc/library/sqlite3.rst

@@ -537,6 +537,7 @@ Connection Objects
          with open('dump.sql', 'w') as f:
              for line in con.iterdump():
                  f.write('%s\n' % line)
+         con.close()
 
 
    .. method:: backup(target, *, pages=0, progress=None, name="main", sleep=0.250)
@@ -573,8 +574,11 @@ Connection Objects
              print(f'Copied {total-remaining} of {total} pages...')
 
          con = sqlite3.connect('existing_db.db')
-         with sqlite3.connect('backup.db') as bck:
+         bck = sqlite3.connect('backup.db')
+         with bck:
              con.backup(bck, pages=1, progress=progress)
+         bck.close()
+         con.close()
 
       Example 2, copy an existing database into a transient copy::