Namespace: Consultingwerk.SmartFramework.Repository.BusinessEntities.MetaDataSource
Class 
MetaDataSourceDataAccess Copy to Clipboard
Parent classes:
Progress.Lang.Object
Consultingwerk.OERA.DataAccess
Consultingwerk.SmartFramework.SmartDataAccess
Consultingwerk.SmartFramework.Repository.BusinessEntities.RepositoryObjectDataAccess
Consultingwerk.SmartFramework.Repository.BusinessEntities.MetaDataSource.MetaDataSourceDataAccess

Inherits: Consultingwerk.SmartFramework.Repository.BusinessEntities.RepositoryObjectDataAccess
Implements: Consultingwerk.OERA.IDataAccess, Consultingwerk.OERA.IDataAccessCanFind, Consultingwerk.OERA.IDataAccessCountRecords, IDSQueryStringSource, Consultingwerk.OERA.IProvidesSmartRecordInformation

File:MetaDataSourceDataAccess
Purpose:Data Access Component
Author(s):Mike Fechner / Consultingwerk Ltd.
Created:29.10.2020 12:04:25

Consultingwerk.SmartFramework.Repository.BusinessEntities.MetaDataSource.MetaDataSourceBusinessEntity
Consultingwerk.SmartFramework.Repository.BusinessEntities.MetaDataSource.MetaDataSourceBusinessEntity

Navigate to: Methods | Constructors | Events | Properties | ProDatasets | Temp-Tables



Top Method Summary
Options Name Purpose
AttachDataSources () Attaches the DATA-SOURCE objects to the ProDataset Buffers
BindDataset (dataset) Do nothing, just receive the parameter and bind to the received Dataset reference
CommitChanges (handle) This method is called from SaveChanges in the DA to do the actual database commit and any transaction-related validation logic for a buffer.
DefineReadEvents () TO-DO: Subscribe to ProDataset Event Handlers using SET-CALLBACK as needed
DetachDataSources () Detaches the DATA-SOURCE objects to the ProDataset Buffers
SaveChanges () Save changes to physical storage
CHARACTER SourceColumn (character, character) Returns the database field name matching a temp-table field name contained in a consumers query string (query string vs. temp-table definition)
CHARACTER SourceDefaultQuery (character) Returns the base query string used to retrieve data for the temp tables. This query string will be appended by the query provided by the consumer (FetchDataRequest object).

Top Constructor Summary
Options Name Purpose
MetaDataSourceDataAccess (handle) Constructor for the MetaDataSourceDataAccess class


Method Detail
Top

AttachDataSources ()
Purpose: Attaches the DATA-SOURCE objects to the ProDataset Buffers
Notes: Overrides ABSTRACT method in Consultingwerk.OERA.DataAccess,
Invoked in FetchData and SaveChanges

Top

BindDataset (dataset)
Purpose: Do nothing, just receive the parameter and bind to the received
Dataset reference
Notes: Invoked from the class constructor

Parameters:
dsMetaDataSource DATASET dsMetaDataSource
DATASET to bind to
Top

CommitChanges (handle)
Purpose: This method is called from SaveChanges in the DA
to do the actual database commit and any transaction-related
validation logic for a buffer.
Notes: This is taken directly from the OERI.
- Note that in this sample that illustrates support for distributed
business logic the DA saves the whole dataset in SaveChanges, so
this is not currently called from the BE.
- The event names are the same as in the OERI. The word "Trans"
is somewhat misleading as the DA need to support large transactions.
One could consider using a name that indicates that this is a row
event instead.

Parameters:
phBuffer HANDLE
The handle of the after buffer to commit
Top

DefineReadEvents ()
Purpose: TO-DO: Subscribe to ProDataset Event Handlers using SET-CALLBACK
as needed
Notes: Overrides ABSTRACT method in Consultingwerk.OERA.DataAccess,
Invoked in FetchData, note that the callback methods need to be
PUBLIC and need to have the Dataset defined as an INPUT Parameter.
Errors thrown from or raised in the FILL call-back methods of the
DataAccess class (SET-CALLBACK) will stop the Dataset from getting
filled / filled further. However errors thrown from the call-back
methods are not thrown from the FILL() method further up into a
catch block or to the client.
See http://knowledgebase.progress.com/articles/Article/P188375
Sample: BUFFER eCustomer:SET-CALLBACK (Consultingwerk.DatasetBufferCallbackEnum:AfterFill,
"eCustomerAfterFill":U) U) .

Top

DetachDataSources ()
Purpose: Detaches the DATA-SOURCE objects to the ProDataset Buffers
Notes: Overrides ABSTRACT method in Consultingwerk.OERA.DataAccess,
Invoked in FetchData and SaveChanges

Top

SaveChanges ()
Purpose: Save changes to physical storage
Notes: This implementation of data access save traverses all records in order
to:
- Allow the DA to control transactions, which cannot be directly
controlled in distributed BL. Transaction control is a concern of
the BL, but should not be controlled with TRANSACTION keyword.
- Offer a course grained save interface from distributed BL
- The default operation here is just a transaction per record
- This simple sample does not use child relations to traverse
the buffers as the OERI BE example. (A property that controls
update order would give the same effect).
- Traversing of child data from a parent would make sense if done for
one parent record at a time.

Top

CHARACTER SourceColumn (character, character)
Purpose: Returns the database field name matching a temp-table field name
contained in a consumers query string (query string vs. temp-table
definition)
Notes: Call-back used by Consultingwerk.OERA.Query.DSQueryString (part of
DataAccess:FetchData FetchData () query preparation
TO-DO: Provide code for alternative mapping

Parameters:
pcTable CHARACTER
The temp table name to return the source (database table) field name for
pcColumn CHARACTER
The temp table column name to return the source (database table) field name for
Returns CHARACTER
The database field name mapped to the passed in temp-table field
Top

CHARACTER SourceDefaultQuery (character)
Purpose: Returns the base query string used to retrieve data for the temp
tables. This query string will be appended by the query provided by
the consumer (FetchDataRequest object).
Notes: Call-back used by Consultingwerk.OERA.Query.DSQueryString (part of
DataAccess:FetchData FetchData () query preparation
TO-DO: Provide code to return the DATA-SOURCE root query string

Parameters:
pcTable CHARACTER
The temp table name to return the source default (database) query string for
Returns CHARACTER
The base query string used to retrieve data for the given temp-table


Constructor Detail
Top

MetaDataSourceDataAccess (handle)
Purpose: Constructor for the MetaDataSourceDataAccess class
Notes: Used by the BusinessEntity, will receive the handle of the dataset
instance form the BusinessEntity as a parameter. Permanently BIND's
to that dataset using the PRIVATE BindDataset Method.

Parameters:
phDataset HANDLE
The handle of the Business Entity dataset


ProDataset Detail

ProDataset dsMetaDataSource

Member tables: eMetaDataSource


Temp-Table Detail

Temp-Table eMetaDataSource

Defined in:


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