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import pytest
from pymysql.tests import base
import pymysql.cursors
from pymysql.constants import CLIENT, ER
class TestSSCursor(base.PyMySQLTestCase):
def test_SSCursor(self):
affected_rows = 18446744073709551615
conn = self.connect(client_flag=CLIENT.MULTI_STATEMENTS)
data = [
("America", "", "America/Jamaica"),
("America", "", "America/Los_Angeles"),
("America", "", "America/Lima"),
("America", "", "America/New_York"),
("America", "", "America/Menominee"),
("America", "", "America/Havana"),
("America", "", "America/El_Salvador"),
("America", "", "America/Costa_Rica"),
("America", "", "America/Denver"),
("America", "", "America/Detroit"),
]
cursor = conn.cursor(pymysql.cursors.SSCursor)
# Create table
cursor.execute(
"CREATE TABLE tz_data (region VARCHAR(64), zone VARCHAR(64), name VARCHAR(64))"
)
conn.begin()
# Test INSERT
for i in data:
cursor.execute("INSERT INTO tz_data VALUES (%s, %s, %s)", i)
self.assertEqual(conn.affected_rows(), 1, "affected_rows does not match")
conn.commit()
# Test fetchone()
iter = 0
cursor.execute("SELECT * FROM tz_data")
while True:
row = cursor.fetchone()
if row is None:
break
iter += 1
# Test cursor.rowcount
self.assertEqual(
cursor.rowcount,
affected_rows,
"cursor.rowcount != %s" % (str(affected_rows)),
)
# Test cursor.rownumber
self.assertEqual(
cursor.rownumber, iter, "cursor.rowcount != %s" % (str(iter))
)
# Test row came out the same as it went in
self.assertEqual((row in data), True, "Row not found in source data")
# Test fetchall
cursor.execute("SELECT * FROM tz_data")
self.assertEqual(
len(cursor.fetchall()),
len(data),
"fetchall failed. Number of rows does not match",
)
# Test fetchmany
cursor.execute("SELECT * FROM tz_data")
self.assertEqual(
len(cursor.fetchmany(2)),
2,
"fetchmany failed. Number of rows does not match",
)
# So MySQLdb won't throw "Commands out of sync"
while True:
res = cursor.fetchone()
if res is None:
break
# Test update, affected_rows()
cursor.execute("UPDATE tz_data SET zone = %s", ["Foo"])
conn.commit()
self.assertEqual(
cursor.rowcount,
len(data),
"Update failed. affected_rows != %s" % (str(len(data))),
)
# Test executemany
cursor.executemany("INSERT INTO tz_data VALUES (%s, %s, %s)", data)
self.assertEqual(
cursor.rowcount,
len(data),
"executemany failed. cursor.rowcount != %s" % (str(len(data))),
)
# Test multiple datasets
cursor.execute("SELECT 1; SELECT 2; SELECT 3")
self.assertListEqual(list(cursor), [(1,)])
self.assertTrue(cursor.nextset())
self.assertListEqual(list(cursor), [(2,)])
self.assertTrue(cursor.nextset())
self.assertListEqual(list(cursor), [(3,)])
self.assertFalse(cursor.nextset())
cursor.execute("DROP TABLE IF EXISTS tz_data")
cursor.close()
def test_execution_time_limit(self):
# this method is similarly implemented in test_cursor
conn = self.connect()
# table creation and filling is SSCursor only as it's not provided by self.setUp()
self.safe_create_table(
conn,
"test",
"create table test (data varchar(10))",
)
with conn.cursor() as cur:
cur.execute(
"insert into test (data) values "
"('row1'), ('row2'), ('row3'), ('row4'), ('row5')"
)
conn.commit()
db_type = self.get_mysql_vendor(conn)
with conn.cursor(pymysql.cursors.SSCursor) 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 Cursor, SSCursor returns a list 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 and raises an
# incomplete unbuffered query warning
with pytest.warns(UserWarning):
cur.execute("SELECT 1")
self.assertEqual(cur.fetchone(), (1,))
# SSCursor will not read the EOF packet until we try to read
# another row. Skipping this will raise an incomplete unbuffered
# query warning in the next cur.execute().
self.assertEqual(cur.fetchone(), None)
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 an unbuffered cursor the OperationalError may not show up
# until fetching the entire result
cur.execute(sql)
cur.fetchall()
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(pymysql.cursors.SSCursor)
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],
)
# ensure unbuffered result is finished
self.assertIsNone(cur.fetchone())
cur.execute("SELECT 1")
self.assertEqual(cur.fetchone(), (1,))
self.assertIsNone(cur.fetchone())
self.assertEqual(cur.warning_count, 0)
cur.execute("SELECT CAST('abc' AS SIGNED)")
# this ensures fully retrieving the unbuffered result
rows = cur.fetchmany(2)
self.assertEqual(len(rows), 1)
self.assertEqual(cur.warning_count, 1)
__all__ = ["TestSSCursor"]
if __name__ == "__main__":
import unittest
unittest.main()
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