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- builtins.Exception(builtins.BaseException)
-
- DatabaseConnectionFailure
- builtins.object
-
- DatabaseConnection
class DatabaseConnection(builtins.object) |
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DatabaseConnection - Manages connections to the postgresql database
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Methods defined here:
- __init__(self, host=UseGlobalSetting, port=UseGlobalSetting, dbname=UseGlobalSetting, user=UseGlobalSetting, password=UseGlobalSetting, isTransactionMode=False)
- __init__ - Create a DatabaseConnection object
@param host <str/None/UseGlobalSetting> Default UseGlobalSetting -
IP or hostname to postgresql server.
If left at default UseGlobalSetting, the global value
will be used. Use "None" to not provide this element when connecting,
otherwise give a value to use.
@param port <int/None/UseGlobalSetting> Default UseGlobalSetting -
Port number to access postgresql on.
If left at default UseGlobalSetting, the global value
will be used. Use "None" to use the default [5432],
otherwise provide an alternate port
@param dbname <str/None/UseGlobalSetting> Default UseGlobalSetting -
Name of database to use
If left at default UseGlobalSetting, the global value
will be used. Use "None" to not provide this element when connecting,
otherwise give a value to use.
@param user <str/None/UseGlobalSetting> Default UseGlobalSetting -
Username to use
If left at default UseGlobalSetting, the global value
will be used. Use "None" to not provide this element when connecting,
otherwise give a value to use.
@param password <str/None/UseGlobalSetting> Default UseGlobalSetting -
Password to use
If left at default UseGlobalSetting, the global value
will be used. Use "None" to not provide this element when connecting,
otherwise give a value to use.
@param isTransactionMode <bool> default False, whether or not to default this connection to using transactions.
If False, autocommit is enabled.
- beginTransactionMode(self)
- beginTransactionMode - Set transaction mode.
This disables autocommit on future connection, and closes current connection.
@see #commitTransaction to commit the current transaction
@see #endTransactionMode to unset transaction mode
Alias is "startTransactionMode"
- closeConnection(self)
- closeConnection - Close the database connection
- commit(self)
- commit - Commit whatever is on the current connection
- commitTransaction(self)
- commitTransaction - Commit the current in-progress transaction.
Requires transaction mode to be on, @see #beginTransactionMode
- doInsert(self, query, valueDicts=None, autoCommit=True, returnPk=True)
- doInsert - Perform an INSERT query with a parameterized query
@param query - Query string.
For fields, e.x. "name" and "value":
INSERT INTO mytable (name, number) VALUES ( %(name)s , %(value)s )
@param valueDicts - A list of dicts, where each dict key = column name and value = column value.
So with above example select, valueDicts might be:
[
{ 'name' : 'Jimbo' , 'value' : 18 },
{ 'name' : 'Timbob', 'value' : 3033 },
]
which would cause the insert line to be executed twice,
once for each row to be inserted (element in the list)
@param autoCommit - If True, will commit transaction after these inserts
@param returnPk <bool> - If True, will return the primary key(s) inserted
@return list<int> - if returnPk is True, otherwise None
- doSelect(self, query)
- doSelect - Perform a SELECT query and return all the rows.
Results are ordered by SELECT order
@param list<tuple> - List of rows, each tuple of cols
- doSelectParams(self, query, params)
- endTransactionMode(self)
- endTransactionMode - Disable transaction mode.
This will enable autocommit on future connections, and closes current connection.
@see #beginTransactionMode to re-enable transaction mode
- executeSql(self, query)
- executeSql - Execute arbitrary SQL.
@param query <str> - SQL query to execute
No return. Maybe can guage number of rows returned etc
- executeSqlParams(self, query, params)
- executeSqlParams - Execute arbitary SQL with parameterized values
@param query <str> - SQL Query
@param params <dict> - Params to pass, %(name)s should have an entry "name"
- getConnection(self, forceReconnect=False)
- getConnection - Return a psycopg2 connection based on
connection info on this object.
Will reuse existing connection, if present.
@param forceReconnect <bool> default False - If True,
will force the connection to be re-established
@return < None/ psycopg2.connection object> -
Connection, if successful, otherwise None
- getCursor(self, forceReconnect=False)
- getCursor - Gets a psycopg cursor to the database
@param forceReconnect <bool> - Default False, if True
will force the connection to be re-established
@return psycopg2.cursor object
- rollback(self)
- rollback - rollback whatever transaction is on the current connection
- startTransactionMode = beginTransactionMode(self)
Data descriptors defined here:
- __dict__
- dictionary for instance variables (if defined)
- __weakref__
- list of weak references to the object (if defined)
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class DatabaseConnectionFailure(builtins.Exception) |
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Common base class for all non-exit exceptions.
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- Method resolution order:
- DatabaseConnectionFailure
- builtins.Exception
- builtins.BaseException
- builtins.object
Data descriptors defined here:
- __weakref__
- list of weak references to the object (if defined)
Methods inherited from builtins.Exception:
- __init__(self, /, *args, **kwargs)
- Initialize self. See help(type(self)) for accurate signature.
- __new__(*args, **kwargs) from builtins.type
- Create and return a new object. See help(type) for accurate signature.
Methods inherited from builtins.BaseException:
- __delattr__(self, name, /)
- Implement delattr(self, name).
- __getattribute__(self, name, /)
- Return getattr(self, name).
- __reduce__(...)
- helper for pickle
- __repr__(self, /)
- Return repr(self).
- __setattr__(self, name, value, /)
- Implement setattr(self, name, value).
- __setstate__(...)
- __str__(self, /)
- Return str(self).
- with_traceback(...)
- Exception.with_traceback(tb) --
set self.__traceback__ to tb and return self.
Data descriptors inherited from builtins.BaseException:
- __cause__
- exception cause
- __context__
- exception context
- __dict__
- __suppress_context__
- __traceback__
- args
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