Transakcije v MariaDB/MySQL (transakcija A)
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- Arthur Phillips
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1 Transakcije v MariaDB/MySQL (transakcija A) Pomožni elementi In [1]: # pyodbc import pyodbc try: cn1.close() except: pass # MariaDB/MySQL conn = "DRIVER={MySQL ODBC 5.3 Unicode Driver};SERVER=localhost;DATABASE=sandbox;UID=tu p;pwd=tupvaje" cn1 = pyodbc.connect(conn, autocommit=false) c1=cn1.cursor() In [2]: # Izpis rezultatov poizvedbe (pomožna funkcija) def tabela(rez): try: # Glava for g in rez.description: print(g[0],end="\t") print("\n"+"-"*31) # Vsebina for r in rez.fetchall(): for a in r: print(a,end="\t") print() # Število vrstic print("vseh vrstic je", rez.rowcount) except Exception(e): pass Nadaljuj s pomožnimi elementi transakcije B Korak A1: nastavi transakcijske parametre za vse nadaljnje nove transakcije In [3]: # Timeout ob predolgem zaklepanju c1.execute("set SESSION innodb_lock_wait_timeout = 5") # Čas v sekundah # Preizkusite različne stopnje izolacije c1.execute("set SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED") # Začnemo novo transakcijo 1/6
2 Korak A2: kreiramo in napolnimo testno tabelo In [4]: c1.execute("drop TABLE IF EXISTS rezervacija") c1.execute("drop TABLE IF EXISTS jadralec") c1.execute("""create TABLE jadralec AS SELECT * from tup.jadralec""") c1.execute("alter TABLE jadralec ADD PRIMARY KEY(jid)") #c1.execute("alter TABLE jadralec ENGINE MYISAM") # Privzeto: InnoDB ; Korak A3: izpis vsebine tabele pred spremembo In [5]: c1.execute("select * FROM jadralec") tabela(c1) jid ime rating starost Darko Borut Lojze Andrej Rajko Henrik Zdravko Henrik Anze Bine Vseh vrstic je 10 Nadaljuj s korakom B1 Branje neobstoječega podatka (dirty read) stopnja izolacije mora biti vsaj READ COMMITTED Korak A4: sprememba tabele try: SET rating = 222 \ WHERE jid = 29") except Exception as e: print(e) 2/6
3 Korak A5: izpis vsebine tabele po spremembi Nadaljuj na koraku B5 Korak A6: razveljavi spremembe in ponovno izpiši In [6]: c1.rollback() jid ime rating starost Darko Borut Lojze Andrej Rajko Henrik Zdravko Henrik Anze Bine Vseh vrstic je 10 Izgubljeno ažuriranje Korak A7: začetek nove transakcije in izpis ratinga In [7]: c1.rollback() c1.execute(""" SELECT rating FROM jadralec WHERE jid = 29""") rating = c1.fetchone()[0] print (rating) 1 Nadaljuj s korakom B4 Korak A8: sprememba ratinga 3/6
4 In [8]: SET rating =? \ WHERE jid = 29", rating + 100) Out[8]: <pyodbc.cursor at 0x21b88ae6db0> Nadaljuj s korakom B5 Korak A9: potrjevanje sprememb in izpis Neponovljivo branje (`non-repeatable read`) Potrebuje stopnjo izolacije najmanj REPEATABLE READ Alernativno: SELECT... LOCK IN SHARE MODE na kateri koli stopnji izolacije Korak A10: začetek transakcije in prvi izpis Nadaljuj s korakom B7 Korak A11: nadaljevanje transakcije in drugi izpis Fantomsko branje (`phantom read`) Potrebujemo SERIALIZABLE 4/6
5 Korak A12: začetek transakcije in prvi izpis Nadaljuj s korakom B8 Korak A13: nadaljevanje transakcije in drugi izpis Če je stopnja izolacije nižja od SERIALIZABLE pride do pojava fantomske vrstice. Mrtva zanka Korak A14: prva sprememba in zaklepanje c1.execute("set innodb_lock_wait_timeout = 500") # Daljši timeout samo za trenutno tran sakcijo SET rating =? \ WHERE jid = 22", 122) Nadaljuj s korakom B9. Korak A15: druga sprememba in zaklepanje SET rating =? \ WHERE jid = 29", 129) 5/6
6 Čakamo na transakcijo B, dokler se ta ne prekine zaradi pojava mrtve zanke. Nadaljuj s korakom B10. Korak A16: izpis 6/6
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