25 lines
726 B
Python
Executable file
25 lines
726 B
Python
Executable file
from itertools import chain
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from django.db import connection, transaction
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class LockModel(object):
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def __init__(self, write, read=()):
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self.tables = ", ".join(
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chain(
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("`%s` WRITE" % model._meta.db_table for model in write),
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("`%s` READ" % model._meta.db_table for model in read),
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)
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)
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self.cursor = connection.cursor()
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def __enter__(self):
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self.cursor.execute("LOCK TABLES " + self.tables)
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def __exit__(self, exc_type, exc_val, exc_tb):
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if exc_type is None:
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transaction.commit()
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else:
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transaction.rollback()
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self.cursor.execute("UNLOCK TABLES")
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self.cursor.close()
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