repos/PyMySQL-PyMySQL-2cab9ec/pymysql/tests/test_cursor.py

from pymysql.constants import ER
from pymysql.tests import base
import pymysql.cursors

import pytest


class CursorTest(base.PyMySQLTestCase):
    def setUp(self):
        super().setUp()

        conn = self.connect()
        self.safe_create_table(
            conn,
            "test",
            "create table test (data varchar(10))",
        )
        cursor = conn.cursor()
        cursor.execute(
            "insert into test (data) values ('row1'), ('row2'), ('row3'), ('row4'), ('row5')"
        )
        conn.commit()
        cursor.close()
        self.test_connection = pymysql.connect(**self.databases[0])
        self.addCleanup(self.test_connection.close)

    def test_cursor_is_iterator(self):
        """Test that the cursor is an iterator"""
        conn = self.test_connection
        cursor = conn.cursor()
        cursor.execute("select * from test")
        self.assertEqual(cursor.__iter__(), cursor)
        self.assertEqual(cursor.__next__(), ("row1",))

    def test_cleanup_rows_unbuffered(self):
        conn = self.test_connection
        cursor = conn.cursor(pymysql.cursors.SSCursor)

        cursor.execute("select * from test as t1, test as t2")
        for counter, row in enumerate(cursor):
            if counter > 10:
                break

        del cursor

        c2 = conn.cursor()

        c2.execute("select 1")
        self.assertEqual(c2.fetchone(), (1,))
        self.assertIsNone(c2.fetchone())

    def test_cleanup_rows_buffered(self):
        conn = self.test_connection
        cursor = conn.cursor(pymysql.cursors.Cursor)

        cursor.execute("select * from test as t1, test as t2")
        for counter, row in enumerate(cursor):
            if counter > 10:
                break

        del cursor

        c2 = conn.cursor()
        c2.execute("select 1")

        self.assertEqual(c2.fetchone(), (1,))
        self.assertIsNone(c2.fetchone())

    def test_executemany(self):
        conn = self.test_connection
        cursor = conn.cursor(pymysql.cursors.Cursor)

        m = pymysql.cursors.RE_INSERT_VALUES.match(
            "INSERT INTO TEST (ID, NAME) VALUES (%s, %s)"
        )
        self.assertIsNotNone(m, "error parse %s")
        self.assertEqual(m.group(3), "", "group 3 not blank, bug in RE_INSERT_VALUES?")

        m = pymysql.cursors.RE_INSERT_VALUES.match(
            "INSERT INTO TEST (ID, NAME) VALUES (%(id)s, %(name)s)"
        )
        self.assertIsNotNone(m, "error parse %(name)s")
        self.assertEqual(m.group(3), "", "group 3 not blank, bug in RE_INSERT_VALUES?")

        m = pymysql.cursors.RE_INSERT_VALUES.match(
            "INSERT INTO TEST (ID, NAME) VALUES (%(id_name)s, %(name)s)"
        )
        self.assertIsNotNone(m, "error parse %(id_name)s")
        self.assertEqual(m.group(3), "", "group 3 not blank, bug in RE_INSERT_VALUES?")

        m = pymysql.cursors.RE_INSERT_VALUES.match(
            "INSERT INTO TEST (ID, NAME) VALUES (%(id_name)s, %(name)s) ON duplicate update"
        )
        self.assertIsNotNone(m, "error parse %(id_name)s")
        self.assertEqual(
            m.group(3),
            " ON duplicate update",
            "group 3 not ON duplicate update, bug in RE_INSERT_VALUES?",
        )

        # https://github.com/PyMySQL/PyMySQL/pull/597
        m = pymysql.cursors.RE_INSERT_VALUES.match(
            "INSERT INTO bloup(foo, bar)VALUES(%s, %s)"
        )
        assert m is not None

        # cursor._executed must bee "insert into test (data)
        #  values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9)"
        # list args
        data = range(10)
        cursor.executemany("insert into test (data) values (%s)", data)
        self.assertTrue(
            cursor._executed.endswith(b",(7),(8),(9)"),
            "execute many with %s not in one query",
        )

        # dict args
        data_dict = [{"data": i} for i in range(10)]
        cursor.executemany("insert into test (data) values (%(data)s)", data_dict)
        self.assertTrue(
            cursor._executed.endswith(b",(7),(8),(9)"),
            "execute many with %(data)s not in one query",
        )

        # %% in column set
        cursor.execute(
            """\
            CREATE TABLE percent_test (
                `A%` INTEGER,
                `B%` INTEGER)"""
        )
        try:
            q = "INSERT INTO percent_test (`A%%`, `B%%`) VALUES (%s, %s)"
            self.assertIsNotNone(pymysql.cursors.RE_INSERT_VALUES.match(q))
            cursor.executemany(q, [(3, 4), (5, 6)])
            self.assertTrue(
                cursor._executed.endswith(b"(3, 4),(5, 6)"),
                "executemany with %% not in one query",
            )
        finally:
            cursor.execute("DROP TABLE IF EXISTS percent_test")

    def test_execution_time_limit(self):
        # this method is similarly implemented in test_SScursor

        conn = self.test_connection
        db_type = self.get_mysql_vendor(conn)

        with conn.cursor(pymysql.cursors.Cursor) as cur:
            # MySQL MAX_EXECUTION_TIME takes ms
            # MariaDB max_statement_time takes seconds as int/float, introduced in 10.1

            # this will sleep 0.01 seconds per row
            if db_type == "mysql":
                sql = (
                    "SELECT /*+ MAX_EXECUTION_TIME(2000) */ data, sleep(0.01) FROM test"
                )
            else:
                sql = "SET STATEMENT max_statement_time=2 FOR SELECT data, sleep(0.01) FROM test"

            cur.execute(sql)
            # unlike SSCursor, Cursor returns a tuple of tuples here
            self.assertEqual(
                cur.fetchall(),
                (
                    ("row1", 0),
                    ("row2", 0),
                    ("row3", 0),
                    ("row4", 0),
                    ("row5", 0),
                ),
            )

            if db_type == "mysql":
                sql = (
                    "SELECT /*+ MAX_EXECUTION_TIME(2000) */ data, sleep(0.01) FROM test"
                )
            else:
                sql = "SET STATEMENT max_statement_time=2 FOR SELECT data, sleep(0.01) FROM test"
            cur.execute(sql)
            self.assertEqual(cur.fetchone(), ("row1", 0))

            # this discards the previous unfinished query
            cur.execute("SELECT 1")
            self.assertEqual(cur.fetchone(), (1,))

            if db_type == "mysql":
                sql = "SELECT /*+ MAX_EXECUTION_TIME(1) */ data, sleep(1) FROM test"
            else:
                sql = "SET STATEMENT max_statement_time=0.001 FOR SELECT data, sleep(1) FROM test"
            with pytest.raises(pymysql.err.OperationalError) as cm:
                # in a buffered cursor this should reliably raise an
                # OperationalError
                cur.execute(sql)

            if db_type == "mysql":
                # this constant was only introduced in MySQL 5.7, not sure
                # what was returned before, may have been ER_QUERY_INTERRUPTED
                self.assertEqual(cm.value.args[0], ER.QUERY_TIMEOUT)
            else:
                self.assertEqual(cm.value.args[0], ER.STATEMENT_TIMEOUT)

            # connection should still be fine at this point
            cur.execute("SELECT 1")
            self.assertEqual(cur.fetchone(), (1,))

    def test_warnings(self):
        con = self.connect()
        cur = con.cursor()
        cur.execute("DROP TABLE IF EXISTS `no_exists_table`")
        self.assertEqual(cur.warning_count, 1)

        cur.execute("SHOW WARNINGS")
        w = cur.fetchone()
        self.assertEqual(w[1], ER.BAD_TABLE_ERROR)
        self.assertIn(
            "no_exists_table",
            w[2],
        )

        cur.execute("SELECT 1")
        self.assertEqual(cur.warning_count, 0)