C# Class Azavea.Open.DAO.Memory.MemoryDaLayer

Data access layer implementation that simply stores objects in memory.

Inheritance: Azavea.Open.DAO.Unqueryable.UnqueryableDaLayer, IDaDdlLayer

Mostra file Open project: azavea/net-dao Class Usage Examples

Public Methods

Method	Description
CreateIndex ( string name, ClassMapping mapping, ICollection propertyNames ) : void	Indexes the data for faster queries. Some data sources may not support indexes (such as CSV files), in which case this should throw a NotSupportedException. If the data source supports indexes, but support for creating them is not yet implemented, this should throw a NotImplementedException.
CreateSequence ( string name ) : void	Ensures the sequence exists. NOTE: It is not necessary to call this method, as this data store creates sequences on the fly when they are first accessed.
CreateStoreHouse ( ) : void	Does nothing. This data store does not support store houses.
CreateStoreRoom ( ClassMapping mapping ) : void	Creates the store room specified in the connection descriptor. NOTE: It is not necessary to call this method, as this data store will create the store room on the fly if it does not exist.
Delete ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit ) : int	Deletes a data object record using the mapping and criteria for what's deleted.
DeleteIndex ( string name, ClassMapping mapping ) : void	Removes an index on the data for slower queries (but usually faster inserts/updates/deletes). Some data sources may not support indexes (such as CSV files), in which case this method should be a no-op. If the data source supports indexes, but support for creating them is not yet implemented, this should throw a NotImplementedException.
DeleteSequence ( string name ) : void	Removes a sequence. NOTE: This data source creates seuqences on the fly when they are accessed, so this will have the effect that the next access of the sequence will get a "1" rather than the current next value.
DeleteStoreHouse ( ) : void	Does nothing. This data store does not support store houses.
DeleteStoreRoom ( ClassMapping mapping ) : void	Deletes the store room specified in the connection descriptor. NOTE: This data store will create the store room on the fly when accessed, so this method is effectively the same as just deleting all the records.
ExecuteQuery ( ITransaction transaction, ClassMapping mapping, IDaQuery query, DataReaderDelegate invokeMe, Hashtable parameters ) : void	Executes a query and invokes a method with a DataReader of results.
GenerateClassMappingFromStoreRoom ( string storeRoomName, IComparer columnSorter ) : ClassMapping	Uses some form of introspection to determine what data is stored in this data store, and generates a ClassMapping that can be immediately used with a DictionaryDAO. As much data as practical will be populated on the ClassMapping, at a bare minimum the Table (typically set to the storeRoomName passed in, or the more correct or fully qualified version of that name), the TypeName (set to the storeRoomName, since we have no .NET type), and the "data cols" and "obj attrs" will be the list of attributes / columns in the data source, mapped to themselves.
GetCount ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit, ICollection groupExpressions ) : List	Gets a count of records for the given criteria, aggregated by the given grouping expressions. This matches "GROUP BY" behavior in SQL.
GetCount ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit ) : int	Gets a count of records for the given criteria.
GetLastAutoGeneratedId ( ITransaction transaction, ClassMapping mapping, string idCol ) : object	Finds the last generated id number for a column.
GetNextSequenceValue ( ITransaction transaction, string sequenceName ) : int	Gets the next id number from a sequence in the data source.
IndexExists ( string name, ClassMapping mapping ) : bool	Returns whether an index with this name exists or not. NOTE: This does NOT verify what properties the index is on, merely whether an index with this name is already present.
Insert ( ITransaction transaction, ClassMapping mapping, object>.IDictionary propValues ) : int	Inserts a data object record using the "table" and a list of column/value pairs.
InsertBatch ( ITransaction transaction, ClassMapping mapping, object>.List propValueDictionaries ) : void	Inserts a list of data object records of the same type.
MemoryDaLayer ( IConnectionDescriptor connDesc ) : System	Create a new memory store.
SequenceExists ( string name ) : bool	Returns whether a sequence with this name exists or not.
StoreHouseMissing ( ) : bool	Always returns false. This data store does not support store houses.
StoreRoomMissing ( ClassMapping mapping ) : bool	Always returns false. This data store will create the storeroom on the fly if it is missing.
Truncate ( ClassMapping mapping ) : void	Deletes all contents of the table. Faster for large tables than DeleteAll, but requires greater permissions. For layers that do not support this, the behavior should be the same as calling Delete(null, mapping).
Update ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit, object>.IDictionary propValues ) : int	Updates a data object record using the "table" and a list of column/value pairs.
UpdateBatch ( ITransaction transaction, ClassMapping mapping, List criteriaList, object>.List propValueDictionaries ) : void	Updates a list of data object records of the same type.

Private Methods

Method	Description
GetNextAutoGeneratedId ( ClassMapping mapping, string idCol ) : object	Finds the next generated id number for a column (for inserts for example).
GetTable ( ClassMapping mapping ) : MemoryObject>.IDictionary

Method Details

CreateIndex() public method

Indexes the data for faster queries. Some data sources may not support indexes (such as CSV files), in which case this should throw a NotSupportedException. If the data source supports indexes, but support for creating them is not yet implemented, this should throw a NotImplementedException.

public CreateIndex ( string name, ClassMapping mapping, ICollection propertyNames ) : void
name	string	Name of the index. Some data sources require names for indexes, /// and even if not this is required so the index can be deleted if desired.
mapping	ClassMapping	ClassMapping for the data that is being indexed.
propertyNames	ICollection	Names of the data properties to include in the index (in order).
return	void

CreateSequence() public method

Ensures the sequence exists. NOTE: It is not necessary to call this method, as this data store creates sequences on the fly when they are first accessed.

public CreateSequence ( string name ) : void
name	string	Name of the new sequence to create.
return	void

CreateStoreHouse() public method

Does nothing. This data store does not support store houses.

public CreateStoreHouse ( ) : void
return	void

CreateStoreRoom() public method

Creates the store room specified in the connection descriptor. NOTE: It is not necessary to call this method, as this data store will create the store room on the fly if it does not exist.

public CreateStoreRoom ( ClassMapping mapping ) : void
mapping	ClassMapping	ClassMapping for the data that will be stored in this room.
return	void

Delete() public method

Deletes a data object record using the mapping and criteria for what's deleted.

public Delete ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit ) : int
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table from which to delete.
crit	Azavea.Open.DAO.Criteria.DaoCriteria	Criteria for deletion. NOTE: Only the expressions are observed, /// other things (like "order" or start / limit) are ignored. /// WARNING: A null or empty (no expression) criteria will /// delete ALL records!
return	int

DeleteIndex() public method

Removes an index on the data for slower queries (but usually faster inserts/updates/deletes). Some data sources may not support indexes (such as CSV files), in which case this method should be a no-op. If the data source supports indexes, but support for creating them is not yet implemented, this should throw a NotImplementedException.

public DeleteIndex ( string name, ClassMapping mapping ) : void
name	string	Name of the index to delete.
mapping	ClassMapping	ClassMapping for the data that was being indexed.
return	void

DeleteSequence() public method

Removes a sequence. NOTE: This data source creates seuqences on the fly when they are accessed, so this will have the effect that the next access of the sequence will get a "1" rather than the current next value.

public DeleteSequence ( string name ) : void
name	string	Name of the sequence to delete.
return	void

DeleteStoreHouse() public method

Does nothing. This data store does not support store houses.

public DeleteStoreHouse ( ) : void
return	void

DeleteStoreRoom() public method

Deletes the store room specified in the connection descriptor. NOTE: This data store will create the store room on the fly when accessed, so this method is effectively the same as just deleting all the records.

public DeleteStoreRoom ( ClassMapping mapping ) : void
mapping	ClassMapping	ClassMapping for the data that was stored in this room.
return	void

ExecuteQuery() public method

Executes a query and invokes a method with a DataReader of results.

public ExecuteQuery ( ITransaction transaction, ClassMapping mapping, IDaQuery query, DataReaderDelegate invokeMe, Hashtable parameters ) : void
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	Class mapping for the table we're querying against. Optional, /// but not all columns may be properly typed if it is null.
query	IDaQuery	The query to execute, should have come from CreateQuery.
invokeMe	DataReaderDelegate	The method to invoke with the IDataReader results.
parameters	System.Collections.Hashtable	A hashtable containing any values that need to be persisted through invoked method. /// The list of objects from the query will be placed here.
return	void

GenerateClassMappingFromStoreRoom() public method

Uses some form of introspection to determine what data is stored in this data store, and generates a ClassMapping that can be immediately used with a DictionaryDAO. As much data as practical will be populated on the ClassMapping, at a bare minimum the Table (typically set to the storeRoomName passed in, or the more correct or fully qualified version of that name), the TypeName (set to the storeRoomName, since we have no .NET type), and the "data cols" and "obj attrs" will be the list of attributes / columns in the data source, mapped to themselves.

public GenerateClassMappingFromStoreRoom ( string storeRoomName, IComparer columnSorter ) : ClassMapping
storeRoomName	string	The name of the storeroom (I.E. table). May be null /// if this data source does not use store rooms.
columnSorter	IComparer	If you wish the columns / attributes to be in a particular /// order, supply this optional parameter. May be null.
return	ClassMapping

GetCount() public method

Gets a count of records for the given criteria, aggregated by the given grouping expressions. This matches "GROUP BY" behavior in SQL.

public GetCount ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit, ICollection groupExpressions ) : List
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table for which to build the query string.
crit	Azavea.Open.DAO.Criteria.DaoCriteria	The criteria to use for "where" comparisons.
groupExpressions	ICollection	The fields/expressions to aggregate on when counting.
return	List

GetCount() public method

Gets a count of records for the given criteria.

public GetCount ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit ) : int
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table for which to build the query string.
crit	Azavea.Open.DAO.Criteria.DaoCriteria	The criteria to use for "where" comparisons.
return	int

GetLastAutoGeneratedId() public method

Finds the last generated id number for a column.

public GetLastAutoGeneratedId ( ITransaction transaction, ClassMapping mapping, string idCol ) : object
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The class mapping for the table being queried.
idCol	string	The ID column for which to find the last-generated ID.
return	object

GetNextSequenceValue() public method

Gets the next id number from a sequence in the data source.

public GetNextSequenceValue ( ITransaction transaction, string sequenceName ) : int
transaction	ITransaction	The transaction to do this as part of.
sequenceName	string	The name of the sequence.
return	int

IndexExists() public method

Returns whether an index with this name exists or not. NOTE: This does NOT verify what properties the index is on, merely whether an index with this name is already present.

public IndexExists ( string name, ClassMapping mapping ) : bool
name	string	Name of the index to check for.
mapping	ClassMapping	ClassMapping for the data that may be indexed.
return	bool

Insert() public method

Inserts a data object record using the "table" and a list of column/value pairs.

public Insert ( ITransaction transaction, ClassMapping mapping, object>.IDictionary propValues ) : int
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table or other data container we're dealing with.
propValues	object>.IDictionary	A dictionary of "column"/value pairs for the object to insert.
return	int

InsertBatch() public method

Inserts a list of data object records of the same type.

public InsertBatch ( ITransaction transaction, ClassMapping mapping, object>.List propValueDictionaries ) : void
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table or other data container we're dealing with.
propValueDictionaries	object>.List	A list of dictionaries of column/value pairs. /// Each item in the list should represent the dictionary of column/value pairs for /// each respective object being inserted.
return	void

MemoryDaLayer() public method

Create a new memory store.

public MemoryDaLayer ( IConnectionDescriptor connDesc ) : System
connDesc	IConnectionDescriptor	Connection descriptor to use with this layer.
return	System

SequenceExists() public method

Returns whether a sequence with this name exists or not.

public SequenceExists ( string name ) : bool
name	string	Name of the sequence to check for.
return	bool

StoreHouseMissing() public method

Always returns false. This data store does not support store houses.

public StoreHouseMissing ( ) : bool
return	bool

StoreRoomMissing() public method

Always returns false. This data store will create the storeroom on the fly if it is missing.

public StoreRoomMissing ( ClassMapping mapping ) : bool
mapping	ClassMapping
return	bool

Truncate() public method

Deletes all contents of the table. Faster for large tables than DeleteAll, but requires greater permissions. For layers that do not support this, the behavior should be the same as calling Delete(null, mapping).

public Truncate ( ClassMapping mapping ) : void
mapping	ClassMapping
return	void

Update() public method

Updates a data object record using the "table" and a list of column/value pairs.

public Update ( ITransaction transaction, ClassMapping mapping, DaoCriteria crit, object>.IDictionary propValues ) : int
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table or other data container we're dealing with.
crit	Azavea.Open.DAO.Criteria.DaoCriteria	All records matching this criteria will be updated per the dictionary of /// values.
propValues	object>.IDictionary	A dictionary of column/value pairs for all non-ID columns to be updated.
return	int

UpdateBatch() public method

Updates a list of data object records of the same type.

public UpdateBatch ( ITransaction transaction, ClassMapping mapping, List criteriaList, object>.List propValueDictionaries ) : void
transaction	ITransaction	The transaction to do this as part of.
mapping	ClassMapping	The mapping of the table or other data container we're dealing with.
criteriaList	List	A list of DaoCriteria. /// Each item in the list should represent the criteria for /// rows that will be updated per the accompanying dictionary.
propValueDictionaries	object>.List	A list of dictionaries of column/value pairs. /// Each item in the list should represent the dictionary of non-ID column/value pairs for /// each respective object being updated.
return	void