Retrieves data from a database for a specified table, columns, and data contract type.

Syntax

public HashSet<T> GetDataFromDatabase<T>(string tableName, IDatabase connection, IQueryGenerator manager, List<string> columns, PropertyEqualityComparer<T> ComparablePropertyEqualityComparer, FilterCallback<T> filterCallback)

Remarks

The method generates a SELECT query using the provided query generation manager and executes it using a DatabaseManager. The resulting data is converted to a HashSet using the specified property equality comparer for data comparison. The retrieved data can be optionally filtered using the provided filter callback function.

Type Parameters

Name	Description
T	The type of data entities to retrieve.

Parameters

Name	Type	Description
tableName	string	The name of the table from which to retrieve data.
connection	IDatabase	The database connection.
manager	IQueryGenerator	The query generation manager for creating the SELECT query.
columns	List<string>	A list of column names to retrieve from the table.
ComparablePropertyEqualityComparer	PropertyEqualityComparer<T>	An equality comparer for identifying properties used in data comparison.
filterCallback	FilterCallback<T>	A callback function for filtering the retrieved data.

Return Value

Type	Description
HashSet<T>	A HashSet of data entities of type T retrieved from the specified table and columns in the database.