/// <summary>
/// Gets the child related data.
/// </summary>
/// <param name="childTableType">Type of the child table.</param>
/// <param name="relation">The relation.</param>
/// <returns></returns>
protected TableMetadata[] GetChildRelatedTableData(Type childTableType, ChildTableRelation relation)
{
PersistentObject persistent = null;
try
{
//create a instance of the table so we can check the relations between out table and this
TableMetadata childTable = (TableMetadata)Activator.CreateInstance(childTableType);
object value = GetField(relation.ForeignKeyName).fieldValue;
//we have the relation between the 2 tables.
persistent = new PersistentObject(this);
TableMetadata[] data = (TableMetadata[])persistent.GetTableMetadata(relation.RelatedTableName, childTableType, value);
return(data);
}
catch
{
throw;
}
finally
{
if (persistent != null)
{
persistent.Dispose();
}
}
}
/// <summary>
/// Returns a DataSet which contains data from the related table
/// </summary>
/// <param name="relatedTableName">Name of the related table</param>
/// <param name="foreignKeyValue">Value of the foreign key</param>
/// <returns>DataSet containing data from the related table</returns>
public DataSet GetDataSet(string relatedTableName, object foreignKeyValue)
{
SqlGenerator generator = new SqlGenerator();
DataSet ds = new DataSet();
ExecutionQuery selectQuery = new ExecutionQuery();
TableRelation[] relations = mappedObject.Relations;
for (int i = 0; i < relations.Length; i++)
{
if (relations[i].RelatedTableName == relatedTableName.Trim())
{
DatabaseField keyField;
//check if we have a ParentRelation or a ChildRelation
if (relations[i] is ParentTableRelation)
{
DatabaseField primaryKeyField = mappedObject.GetPrimaryKeyField();
//this is the parent so we select from the child table.
keyField = new DatabaseField(primaryKeyField.fieldType, ((ParentTableRelation)relations[i]).ForeignKeyName, false, false, foreignKeyValue);
}
else
{
//child relation
ChildTableRelation childRelation = (ChildTableRelation)relations[i];
//this is the child so get data from the parent
keyField = new DatabaseField(mappedObject.GetPrimaryKeyField().fieldType, childRelation.RelatedTableKeyName, true, false, foreignKeyValue);
}
selectQuery = generator.GenerateSelectQuery(database, relations[i].RelatedTableName, keyField);
break;
}
}
if (selectQuery.Query == string.Empty)
{
throw new ArgumentException("Invalid relation name");
}
//run the query in the associated context
if (contextSession != null)
{
ds = execEngine.ExecuteDataSet(selectQuery);
}
else
{
using (ExecutionEngine e = new ExecutionEngine())
{
ds = e.ExecuteDataSet(selectQuery);
}
}
return(ds);
}
/// <summary>
/// Get data from a related table (doen't matter if parent of child) based
/// on the relation name and the primary key's fieldValue from the related table.
/// </summary>
/// <param name="relatedTableName">The name of the related table class name</param>
/// <param name="classType">Class type of the related TableMetadata entity</param>
/// <param name="foreignKeyValue">Foreign key's fieldValue</param>
/// <returns>TableMetadata array which contains the specified data </returns>
public Array GetTableMetadata(string relatedTableName, Type classType, object foreignKeyValue)
{
ArrayList alList = null;
SqlGenerator generator = new SqlGenerator();
try
{
ExecutionQuery selectQuery = new ExecutionQuery();
//hold the table's relations.
TableRelation[] relations = mappedObject.Relations;
//loop and get the relation
for (int i = 0; i < relations.Length; i++)
{
if (relations[i].RelatedTableName == relatedTableName.Trim())
{
DatabaseField keyField;
//check if we habe a ParentRelation or a ChildRelation
if (relations[i] is ParentTableRelation)
{
DatabaseField primaryKeyField = mappedObject.GetPrimaryKeyField();
//this is the parent so we select from the child table.
keyField = new DatabaseField(primaryKeyField.fieldType, ((ParentTableRelation)relations[i]).ForeignKeyName, false, false, foreignKeyValue);
}
else
{
//child relation
ChildTableRelation childRelation = (ChildTableRelation)relations[i];
//this is the child so get data from the parent
keyField = new DatabaseField(mappedObject.GetPrimaryKeyField().fieldType, childRelation.RelatedTableKeyName, true, false, foreignKeyValue);
}
selectQuery = generator.GenerateSelectQuery(database, relations[i].RelatedTableName, keyField);
break;
}
}
if (selectQuery.Query == string.Empty)
{
throw new Exception("Invalid related table name");
}
object tableMetadata = Activator.CreateInstance(classType);
alList = MapDataReaderToTableMetadata(selectQuery, (TableMetadata)tableMetadata);
Array array = Array.CreateInstance(classType, alList.Count);
alList.CopyTo(array);
return(array);
}
finally
{
if (alList != null)
{
alList.Clear();
}
}
}
