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POConnector/python select after insert
 

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  1. POConnector/python select after insert
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    <p>I have a database table with UNIQUE key. If I want to insert some record there are two possible ways. First, the unique item doesn't exist yet, that's OK, just return new id. Second, the item already exists and I need to get the id of this unique record.</p> <p>The problem is, that anything I try, I get always some exception.</p> <p>Here's example of the code:</p> <pre><code>def __init__(self, host, user, password, database): # set basic attributes super().__init__(host, user, password, database) #open connection try: self.__cnx = mysql.connector.connect( database=database, user=user, password=password, host = host) #self.__cursor = self.__cnx.cursor() except ... def insert_domain(self, domain): insertq = "INSERT INTO `sp_domains` (`domain`) VALUES ('{0}')".format(domain) cursor = self.__cnx.cursor() try: cursor.execute(insertq) print("unique") except (mysql.connector.errors.IntegrityError) as err: self.__cnx.commit() print("duplicate") s = "SELECT `domain_id` FROM `sp_domains` WHERE `domain` = '{0}';".format(domain) try: id = cursor.execute(s).fetchone()[0] except AttributeError as err: print("Unable to execute the query:", err, file=sys.stderr) except mysql.connector.errors.ProgrammingError as err: print("Query syntax error:", err, file=sys.stderr) else: self.__cnx.commit() cursor.close() </code></pre> <p>but anyting I try, on the first duplicate record I get either 'MySQL Connection not available', 'Unread result'. The code is just example to demonstrate it.</p> <p>This is my first program using Connector/python, so I don't know all the rules, about fetch the results, commiting queries and so on. </p> <p>Could anyone help me with this issue, please? Or is there any efficient way to such task ('cause this one seems to be not the best solution to me). Thank you for any advice.</p>
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    1. USdakov
    1. USdakov
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    1. CO_Where_ do you get that error? Is it printed as an `AttributeError` or `ProgrammingError`, or raised with a traceback because it's neither of those, or…? Which line does it come from?
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      1. USabarnert
    2. COOk, I've editted the code little bit, so you can see the connection establishing. Method insert_domain() is call in cycle, it crushes at the first appearence of duplicate item. Right now it raises mysql.connector.errors.OperationalError("MySQL Connection not available") exception. In previous version it was type error I guess, something like "NoneType has no attribute 'fetchone'. I'm not sure what changes I have made, I'm quite brainstorming right now
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      1. USdakov
    3. COWell, "NoneType has no attribute 'fetchone'" is an obvious problem.
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      1. USabarnert
 

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