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

Data access layer implementation that simply stores objects in memory.

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

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Открытые методы

Метод	Описание
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.

Приватные методы

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

Описание методов

CreateIndex() публичный Метод

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).
Результат	void

CreateSequence() публичный Метод

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.
Результат	void

CreateStoreHouse() публичный Метод

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

public CreateStoreHouse ( ) : void
Результат	void

CreateStoreRoom() публичный Метод

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.
Результат	void

Delete() публичный Метод

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!
Результат	int

DeleteIndex() публичный Метод

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.
Результат	void

DeleteSequence() публичный Метод

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.
Результат	void

DeleteStoreHouse() публичный Метод

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

public DeleteStoreHouse ( ) : void
Результат	void

DeleteStoreRoom() публичный Метод

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.
Результат	void

ExecuteQuery() публичный Метод

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.
Результат	void

GenerateClassMappingFromStoreRoom() публичный Метод

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.
Результат	ClassMapping

GetCount() публичный Метод

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.
Результат	List

GetCount() публичный Метод

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.
Результат	int

GetLastAutoGeneratedId() публичный Метод

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.
Результат	object

GetNextSequenceValue() публичный Метод

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.
Результат	int

IndexExists() публичный Метод

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.
Результат	bool

Insert() публичный Метод

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.
Результат	int

InsertBatch() публичный Метод

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.
Результат	void

MemoryDaLayer() публичный Метод

Create a new memory store.

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

SequenceExists() публичный Метод

Returns whether a sequence with this name exists or not.

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

StoreHouseMissing() публичный Метод

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

public StoreHouseMissing ( ) : bool
Результат	bool

StoreRoomMissing() публичный Метод

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

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

Truncate() публичный Метод

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
Результат	void

Update() публичный Метод

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.
Результат	int

UpdateBatch() публичный Метод

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.
Результат	void