pgconsole/database.py
author Radek Brich <radek.brich@devl.cz>
Thu, 28 Feb 2013 12:55:25 +0100
changeset 69 1bf7d2f5e00c
parent 10 f3a1b9792cc9
child 76 3a41b351b122
permissions -rw-r--r--
Add doc for PgManager.
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import psycopg2
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import psycopg2.extensions
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import psycopg2.extras
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class DatabaseError(Exception):
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    def __init__(self, msg, query=None):
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        self.query = query
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        Exception.__init__(self, msg)
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class BadConnectionError(Exception):
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    pass
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class Row(dict):
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    def __getattr__(self, key):
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        return self[key]
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class Database:
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    def __init__(self):
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        # pool of database connections
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        # indexed by conninfo, items are lists of connections
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        self.pool = {}
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        # number of unused connections per conninfo to keep open
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        self.pool_keep_open = 1
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    def __del__(self):
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        for conninfo in self.pool.keys():
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            for conn in self.pool[conninfo]:
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                conn.close()
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    def connect(self, conninfo):
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        try:
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            conn = psycopg2.connect(conninfo, async=1)
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            psycopg2.extras.wait_select(conn)
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        except psycopg2.DatabaseError, e:
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            raise DatabaseError(str(e))
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        return conn
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    def get_conn(self, conninfo):
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        if not conninfo in self.pool:
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            self.pool[conninfo] = []
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            return self.connect(conninfo)
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        else:
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            conn = None
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            while len(self.pool[conninfo]) and conn is None:
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                conn = self.pool[conninfo].pop()
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                if conn.closed:
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                    conn = None
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            if conn is None:
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                return self.connect(conninfo)
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        return conn
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    def put_conn(self, conninfo, conn):
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        if len(self.pool[conninfo]) >= self.pool_keep_open:
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            conn.close()
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        else:
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            self.pool[conninfo].append(conn)
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    def execute(self, q, args=[]):
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        conn = self.get_conn()
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        try:
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            curs = conn.cursor()
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            curs.execute(q, args)
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            psycopg2.extras.wait_select(curs.connection)
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#            conn.commit()
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        except psycopg2.OperationalError, e:
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            # disconnected?
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#            conn.rollback()
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            conn.close()
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            raise BadConnectionError(str(e))
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        except psycopg2.DatabaseError, e:
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#            conn.rollback()
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            raise DatabaseError(str(e), curs.query)
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        return curs
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    def finish(self, curs):
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        self.put_conn(curs.connection)
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    def row(self, curs, row):
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        return Row(zip([x[0] for x in curs.description], row))
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    def fetchone(self, curs):
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        return self.row(curs, curs.fetchone())
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    def fetchall(self, curs):
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        rows = curs.fetchall()
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        return [self.row(curs, row) for row in rows]
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