/// <summary>
/// Get the specified instance of the type.
/// </summary>
/// <param name="id">Instance primary key.</param>
/// <returns>The specified instance.</returns>
private static ICollection <T> ReadRecords(string propertyName, object value, bool closeConnection = true)
{
List <long> ids = new List <long>();
List <T> list = new List <T>();
ORMSqlCommand cmd = ORMEntity <T> .SqlDialect.GetSelectByFieldCommand(propertyName);
// Connecto to database
ORMEntity <T> .Connect();
// Set filter parameter
ORMEntity <T> .SetParameter(cmd.Parameters[0], value);
// Execute the SELECT sentence to retrieve the instance properties
using (DbDataReader reader = ORMEntity <T> .ExecuteReader(cmd.SqlCommand))
{
while (reader.Read())
{
ids.Add((long)reader[0]);
}
}
// Close the connection to database
if (closeConnection)
{
ORMEntity <T> .Disconnect();
}
// Get all instances
foreach (long id in ids)
{
if (!ORMEntity <T> .InMemoryTable.ContainsKey(id))
{
T instance = ORMEntity <T> .Get(id, closeConnection);
list.Add(instance);
}
else
{
list.Add(ORMEntity <T> .InMemoryTable[id]);
}
}
return(list);
}
/// <summary>
/// Get the specified instance of the type.
/// </summary>
/// <param name="id">Instance primary key.</param>
/// <returns>The specified instance.</returns>
private static ICollection <T> ReadAllRecords(ICollection <String> sortProperties = null)
{
List <long> ids = new List <long>();
List <T> list = new List <T>();
ORMSqlCommand cmd = ORMEntity <T> .SqlDialect.GetSelectAllCommand(sortProperties);
// Connecto to database
ORMEntity <T> .Connect();
// Execute the SELECT sentence to retrieve the instance properties
using (DbDataReader reader = ORMEntity <T> .ExecuteReader(cmd.SqlCommand))
{
while (reader.Read())
{
ids.Add((long)reader[0]);
}
}
// Close the connection to database
ORMEntity <T> .Disconnect();
// Get all instances
foreach (long id in ids)
{
if (!ORMEntity <T> .InMemoryTable.ContainsKey(id))
{
T instance = ORMEntity <T> .Get(id);
list.Add(instance);
}
else
{
list.Add(ORMEntity <T> .InMemoryTable[id]);
}
}
return(list);
}
/// <summary>
/// Delete an existing instance from database.
/// </summary>
/// <param name="instance">Instance unique identifier.</param>
private static int DeleteDatabaseForeignRecords(long id)
{
int rowsAffected = 0;
object dummy;
T instance = default;
Type foreignType;
MethodInfo deleteMethod;
// Check if there are any foreign collection to delete in cascade
foreach (ORMEntityMember member in ORMEntity <T> .ORMStructure.ForeignCollections)
{
// Get the owner instance
if (instance == null)
{
instance = ORMEntity <T> .Get(id);
}
if (((ORMForeignCollection)member.Attribute).OnDeleteAction == OnDeleteActionTypes.DeleteInCascade)
{
// Get the method GET(long)
foreignType = member.ForeignCollectionType;
foreignType = typeof(ORMEntity <>).MakeGenericType(foreignType);
deleteMethod = foreignType.GetMethod("Delete", new Type[] { typeof(Int64) });
// Delete each instance in collection
foreach (long objId in ORMEntity <T> .GetForeignCollectionIdentifiers(instance, member))
{
// Invoke the method
dummy = Activator.CreateInstance(foreignType);
rowsAffected += (int)deleteMethod.Invoke(dummy, new object[] { objId });
}
}
}
return(rowsAffected);
}
/// <summary>
/// Get the requested instance.
/// </summary>
/// <param name="id">Instance unique identifier (DB).</param>
/// <returns>The requested instance or <c>null</c> if the instance cannot be found.</returns>
public static T Get(Int32 id)
{
return(ORMEntity <T> .Get((Int64)id, true));
}
