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)
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.
|