Modeling.DatabaseAdaptors.AbstractDBAPI2AdaptorLayer.AbstractDBAPI2AdaptorChannel.AbstractDBAPI2AdaptorChannel

Package Modeling :: Package DatabaseAdaptors :: Package AbstractDBAPI2AdaptorLayer :: Module AbstractDBAPI2AdaptorChannel :: Class AbstractDBAPI2AdaptorChannel

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Class AbstractDBAPI2AdaptorChannel

AdaptorChannel --+
                 |
                AbstractDBAPI2AdaptorChannel

Known Subclasses:: MySQLAdaptorChannel, OracleAdaptorChannel, PostgresqlAdaptorChannel, SQLiteAdaptorChannel

Your inheriting concrete Adaptor class must override:

primaryKeysForNewRowsWithEntity()

You normally do not need to override other methods. In particular, dbAPI_cursor() does not need to be overridden --but you will use it to access the underlying cursor.

Method Summary
	`__init__(self, anAdaptorContext)` See Modeling.interfaces.AdaptorChannel for details
	`__unimplemented__(self)`
	`attributesToFetch(self)` See Modeling.interfaces.AdaptorChannel for details
	`cancelFetch(self)` See Modeling.interfaces.AdaptorChannel for details
	`closeChannel(self)` See Modeling.interfaces.AdaptorChannel for details
	`dbAPI_cursor(self)`
	`deleteRowsDescribedByQualifier(self, aQualifier, anEntity)` Builds the DELETE SQLExpression for 'aQualifier' and 'anEntity' ans executes it.
	`describeModelWithTableNames(self, tableNames)` See Modeling.interfaces.AdaptorChannel for details
	`describeResults(self)` See Modeling.interfaces.AdaptorChannel for details
	`describeStoredProcedureNames(self)` See Modeling.interfaces.AdaptorChannel for details
	`describeTableNames(self)` See Modeling.interfaces.AdaptorChannel for details
	`evaluateExpression(self, anSQLexpression)` See Modeling.interfaces.AdaptorChannel for details
	`executeStoredProcedure(self, aStoredProcedure, values)` See Modeling.interfaces.AdaptorChannel for details
	`fetchRow(self)` See Modeling.interfaces.AdaptorChannel for details
	`insertRow(self, row, anEntity)` See Modeling.interfaces.AdaptorChannel for details
	`isFetchInProgress(self)` See Modeling.interfaces.AdaptorChannel for details
	`isOpen(self)` See Modeling.interfaces.AdaptorChannel for details
	`openChannel(self)` See Modeling.interfaces.AdaptorChannel for details
	`primaryKeysForNewRowsWithEntity(self, count, anEntity)` Generates and returns a list of dictionaries, whose keys are PK attributes' names and values the corresponding PK value.
	`returnValuesForLastStoredProcedureInvocation(self)` See Modeling.interfaces.AdaptorChannel for details
	`rowCountForSelectAttributes(self, attributes, aFetchSpecification, shouldLock, anEntity)` Implemented by concrete adaptors to return the number of rows that would be fetched if selectAttributes() is called with the same arguments.
	`selectAttributes(self, attributes, aFetchSpecification, shouldLock, anEntity)` See Modeling.interfaces.AdaptorChannel for details
	`setAttributesToFetch(self, attributes)` See Modeling.interfaces.AdaptorChannel for details
	`updateValuesInRowsDescribedByQualifier(self, row, aQualifier, anEntity)` Builds the UPDATE SQLExpression for 'row', 'aQualifier' and 'anEntity' and executes it.
Inherited from AdaptorChannel
	`adaptorContext(self)` See interfaces.AdaptorChannel for details
	`addStoredProceduresNamed(self, storedProcedureNames, aModel)` See interfaces.AdaptorChannel for details
	`delegate(self)` See interfaces.AdaptorChannel for details
	`deleteRowDescribedByQualifier(self, aQualifier, anEntity)` Calls 'deleteRowsDescribedByQualifier()' on itself and make sure that one and only one row was deleted.
	`dictionaryWithObjectsForAttributes(self, objects, attributes)` See interfaces.AdaptorChannel for details
	`lockRowComparingAttributes(self, atts, anEntity, aQualifier, snapshot)` See interfaces.AdaptorChannel for details
	`performAdaptorOperation(self, anAdaptorOperation)` Examines 'anAdaptorOperation' and executes the corresponding method.
	`performAdaptorOperations(self, adaptorOperations)` Iterates on each item in 'adaptorOperations' and calls 'performAdaptorOperation()' with that item as a parameter.
	`setDelegate(self, aDelegate)` See interfaces.AdaptorChannel for details
	`updateValuesInRowDescribedByQualifier(self, row, aQualifier, anEntity)` Calls 'updateValuesInRowsDescribedByQualifier' on itself and make sure that one and only one row was updated.

Class Variable Summary
`tuple`	`__implements__` = `(<class Modeling.interfaces.AdaptorChan...`
`int`	`_count_for_execute` = 0

Method Details

init(self, anAdaptorContext)
(Constructor)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.__init__

unimplemented(self)

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.__unimplemented__ (inherited documentation)

attributesToFetch(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.attributesToFetch

cancelFetch(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.cancelFetch

closeChannel(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.closeChannel

deleteRowsDescribedByQualifier(self, aQualifier, anEntity)

Builds the DELETE SQLExpression for 'aQualifier' and 'anEntity' ans executes it. Returns the number of rows that were deleted.

Raises GeneralAdaptorException if the channel is not opened, or if it is fetching, or if its AdaptorContext has no transaction in progress.

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.deleteRowsDescribedByQualifier

describeModelWithTableNames(self, tableNames)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.describeModelWithTableNames

describeResults(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.describeResults

describeStoredProcedureNames(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.describeStoredProcedureNames

describeTableNames(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.describeTableNames

evaluateExpression(self, anSQLexpression)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.evaluateExpression

executeStoredProcedure(self, aStoredProcedure, values)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.executeStoredProcedure

fetchRow(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.fetchRow

insertRow(self, row, anEntity)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.insertRow

isFetchInProgress(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.isFetchInProgress

isOpen(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.isOpen

openChannel(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.openChannel

primaryKeysForNewRowsWithEntity(self, count, anEntity)

Generates and returns a list of dictionaries, whose keys are PK attributes' names and values the corresponding PK value.

If 'anEntity' defines more than one PK (compound primary key), returns an empty list.

Parameters:

count -- the number of primary keys to generate

anEntity -- the entity for which PKs are generated

Subclasses should override this method without calling the superclass' implementation.

This method is correlated with the implementation of your concrete SchemaGeneration's methods:

primaryKeySupportStatementsForEntityGroup()

dropPrimaryKeySupportStatementsForEntityGroup()

See also: Modeling.AdaptorChannel.primaryKeysForNewRowsWithEntity()

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.primaryKeysForNewRowsWithEntity

returnValuesForLastStoredProcedureInvocation(self)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.returnValuesForLastStoredProcedureInvocation

rowCountForSelectAttributes(self, attributes, aFetchSpecification, shouldLock, anEntity)

Implemented by concrete adaptors to return the number of rows that would be fetched if selectAttributes() is called with the same arguments.

Parameters: see selectAttributes()

See also: SQLExpression.prepareSelectCountExpressionWithAttributes()

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.rowCountForSelectAttributes (inherited documentation)

selectAttributes(self, attributes, aFetchSpecification, shouldLock, anEntity)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.selectAttributes

setAttributesToFetch(self, attributes)

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.setAttributesToFetch

updateValuesInRowsDescribedByQualifier(self, row, aQualifier, anEntity)

Builds the UPDATE SQLExpression for 'row', 'aQualifier' and 'anEntity' and executes it.

Returns the number of rows that were updated.

Raises GeneralAdaptorException if the channel is not opened, or if it is fetching, or if its AdaptorContext has no transaction in progress.

See Modeling.interfaces.AdaptorChannel for details

Overrides:: Modeling.AdaptorChannel.AdaptorChannel.updateValuesInRowsDescribedByQualifier

Class Variable Details

implements

Type:: tuple
Value:: (<class Modeling.interfaces.AdaptorChannel.IAdaptorChannel at 0xb77020\ 8c>,)

_count_for_execute

Type:: int
Value:: 0

Generated by Epydoc 2.1 on Sat Mar 4 13:36:26 2006

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Class AbstractDBAPI2AdaptorChannel

__init__(self, anAdaptorContext) (Constructor)

__unimplemented__(self)

attributesToFetch(self)

cancelFetch(self)

closeChannel(self)

deleteRowsDescribedByQualifier(self, aQualifier, anEntity)

describeModelWithTableNames(self, tableNames)

describeResults(self)

describeStoredProcedureNames(self)

describeTableNames(self)

evaluateExpression(self, anSQLexpression)

executeStoredProcedure(self, aStoredProcedure, values)

fetchRow(self)

insertRow(self, row, anEntity)

isFetchInProgress(self)

isOpen(self)

openChannel(self)

primaryKeysForNewRowsWithEntity(self, count, anEntity)

returnValuesForLastStoredProcedureInvocation(self)

rowCountForSelectAttributes(self, attributes, aFetchSpecification, shouldLock, anEntity)

selectAttributes(self, attributes, aFetchSpecification, shouldLock, anEntity)

setAttributesToFetch(self, attributes)

updateValuesInRowsDescribedByQualifier(self, row, aQualifier, anEntity)

__implements__

_count_for_execute

init(self, anAdaptorContext)
(Constructor)

unimplemented(self)

implements