cpython/Lib/test/test_sqlite3/test_dump.py

# Author: Paul Kippes <kippesp@gmail.com>

import unittest
import sqlite3 as sqlite
from .test_dbapi import memory_database


class DumpTests(unittest.TestCase):
    def setUp(self):
        self.cx = sqlite.connect(":memory:")
        self.cu = self.cx.cursor()

    def tearDown(self):
        self.cx.close()

    def test_table_dump(self):
        expected_sqls = [
                """CREATE TABLE "index"("index" blob);"""
                ,
                """INSERT INTO "index" VALUES(X'01');"""
                ,
                """CREATE TABLE "quoted""table"("quoted""field" text);"""
                ,
                """INSERT INTO "quoted""table" VALUES('quoted''value');"""
                ,
                "CREATE TABLE t1(id integer primary key, s1 text, " \
                "t1_i1 integer not null, i2 integer, unique (s1), " \
                "constraint t1_idx1 unique (i2));"
                ,
                "INSERT INTO \"t1\" VALUES(1,'foo',10,20);"
                ,
                "INSERT INTO \"t1\" VALUES(2,'foo2',30,30);"
                ,
                "CREATE TABLE t2(id integer, t2_i1 integer, " \
                "t2_i2 integer, primary key (id)," \
                "foreign key(t2_i1) references t1(t1_i1));"
                ,
                "CREATE TRIGGER trigger_1 update of t1_i1 on t1 " \
                "begin " \
                "update t2 set t2_i1 = new.t1_i1 where t2_i1 = old.t1_i1; " \
                "end;"
                ,
                "CREATE VIEW v1 as select * from t1 left join t2 " \
                "using (id);"
                ]
        [self.cu.execute(s) for s in expected_sqls]
        i = self.cx.iterdump()
        actual_sqls = [s for s in i]
        expected_sqls = ['BEGIN TRANSACTION;'] + expected_sqls + \
            ['COMMIT;']
        [self.assertEqual(expected_sqls[i], actual_sqls[i])
            for i in range(len(expected_sqls))]

    def test_dump_autoincrement(self):
        expected = [
            'CREATE TABLE "t1" (id integer primary key autoincrement);',
            'INSERT INTO "t1" VALUES(NULL);',
            'CREATE TABLE "t2" (id integer primary key autoincrement);',
        ]
        self.cu.executescript("".join(expected))

        # the NULL value should now be automatically be set to 1
        expected[1] = expected[1].replace("NULL", "1")
        expected.insert(0, "BEGIN TRANSACTION;")
        expected.extend([
            'DELETE FROM "sqlite_sequence";',
            'INSERT INTO "sqlite_sequence" VALUES(\'t1\',1);',
            'COMMIT;',
        ])

        actual = [stmt for stmt in self.cx.iterdump()]
        self.assertEqual(expected, actual)

    def test_dump_autoincrement_create_new_db(self):
        self.cu.execute("BEGIN TRANSACTION")
        self.cu.execute("CREATE TABLE t1 (id integer primary key autoincrement)")
        self.cu.execute("CREATE TABLE t2 (id integer primary key autoincrement)")
        self.cu.executemany("INSERT INTO t1 VALUES(?)", ((None,) for _ in range(9)))
        self.cu.executemany("INSERT INTO t2 VALUES(?)", ((None,) for _ in range(4)))
        self.cx.commit()

        with memory_database() as cx2:
            query = "".join(self.cx.iterdump())
            cx2.executescript(query)
            cu2 = cx2.cursor()

            dataset = (
                ("t1", 9),
                ("t2", 4),
            )
            for table, seq in dataset:
                with self.subTest(table=table, seq=seq):
                    res = cu2.execute("""
                        SELECT "seq" FROM "sqlite_sequence" WHERE "name" == ?
                    """, (table,))
                    rows = res.fetchall()
                    self.assertEqual(rows[0][0], seq)

    def test_unorderable_row(self):
        # iterdump() should be able to cope with unorderable row types (issue #15545)
        class UnorderableRow:
            def __init__(self, cursor, row):
                self.row = row
            def __getitem__(self, index):
                return self.row[index]
        self.cx.row_factory = UnorderableRow
        CREATE_ALPHA = """CREATE TABLE "alpha" ("one");"""
        CREATE_BETA = """CREATE TABLE "beta" ("two");"""
        expected = [
            "BEGIN TRANSACTION;",
            CREATE_ALPHA,
            CREATE_BETA,
            "COMMIT;"
            ]
        self.cu.execute(CREATE_BETA)
        self.cu.execute(CREATE_ALPHA)
        got = list(self.cx.iterdump())
        self.assertEqual(expected, got)


if __name__ == "__main__":
    unittest.main()