/// <summary>
/// Gets possible association tables between this entity and the supplied entity.
/// </summary>
/// <param name="entity1"></param>
/// <param name="secondEntity"></param>
/// <param name="CardinalityPrimary"></param>
/// <param name="CardinalityForeign"></param>
/// <returns></returns>
public static ITable GetAssociationTable(this Entity entity1, Entity secondEntity, out Cardinality CardinalityPrimary, out Cardinality CardinalityForeign, out IKey mainKey, out IKey associationKey)
{
CardinalityPrimary = null;
CardinalityForeign = null;
mainKey = null;
associationKey = null;
ITable associationTable = null;
foreach (ITable table in entity1.GetMappingSet().Database.AssociationTables())
{
//ITable primaryTable = table.Relationships.FirstOrDefault(r => entity1.MappedTables().Contains(r.PrimaryTable));
bool primaryFound = false;
bool foreignFound = false;
#region Primary
foreach (Relationship relationship in table.Relationships)
{
if (entity1.MappedTables().Contains(relationship.PrimaryTable))
{
associationTable = table;
CardinalityPrimary = relationship.ForeignKey.IsUnique ? Cardinality.One : Cardinality.Many;// relationship.PrimaryCardinality;
//CardinalityForeign = relationship.ForeignCardinality;
mainKey = relationship.PrimaryKey;
//associationKey = relationship.ForeignKey;
primaryFound = true;
break;
}
else if (entity1.MappedTables().Contains(relationship.ForeignTable))
{
associationTable = table;// relationship.ForeignTable;
CardinalityPrimary = relationship.PrimaryKey.IsUnique ? Cardinality.One : Cardinality.Many;// relationship.ForeignCardinality;
//CardinalityForeign = relationship.PrimaryCardinality;
mainKey = relationship.ForeignKey;
//associationKey = relationship.PrimaryKey;
primaryFound = true;
break;
}
}
#endregion
#region Foreign
foreach (Relationship relationship in table.Relationships)
{
if (secondEntity.MappedTables().Contains(relationship.ForeignTable))
{
associationTable = table;
//CardinalityPrimary = relationship.PrimaryCardinality;
CardinalityForeign = relationship.PrimaryKey.IsUnique ? Cardinality.One : Cardinality.Many;// relationship.ForeignCardinality;
//mainKey = relationship.PrimaryKey;
associationKey = relationship.ForeignKey;
foreignFound = true;
break;
}
else if (secondEntity.MappedTables().Contains(relationship.PrimaryTable))
{
//associationTable = table;// relationship.ForeignTable;
//CardinalityPrimary = relationship.ForeignCardinality;
CardinalityForeign = relationship.ForeignKey.IsUnique ? Cardinality.One : Cardinality.Many;// relationship.PrimaryCardinality;
//mainKey = relationship.ForeignKey;
associationKey = relationship.PrimaryKey;
foreignFound = true;
break;
}
}
#endregion
if (primaryFound && foreignFound)
{
break;
}
else
{
associationTable = null;
CardinalityPrimary = null;
CardinalityForeign = null;
mainKey = null;
associationKey = null;
}
// if (entity1.MappedTables().Contains(relationship.PrimaryTable))// &&
// //secondEntity.MappedTables().Contains(relationship.ForeignTable))
// {
// associationTable = table;// relationship.PrimaryTable;
// CardinalityPrimary = relationship.PrimaryCardinality;
// CardinalityForeign = relationship.ForeignCardinality;
// mainKey = relationship.PrimaryKey;
// associationKey = relationship.ForeignKey;
// if (oneFound)
// break;
// else
// oneFound = true;
// }
// else if (entity1.MappedTables().Contains(relationship.ForeignTable) &&
//secondEntity.MappedTables().Contains(relationship.PrimaryTable))
// {
// associationTable = table;// relationship.ForeignTable;
// CardinalityPrimary = relationship.ForeignCardinality;
// CardinalityForeign = relationship.PrimaryCardinality;
// mainKey = relationship.ForeignKey;
// associationKey = relationship.PrimaryKey;
// if (oneFound)
// break;
// else
// oneFound = true;
// }
//}
}
if (associationTable != null)
return associationTable;
ITable unpureAssociationTable = null;
if (associationTable == null)
{
foreach (ITable table in entity1.MappedTables())
{
foreach (Relationship relationship in table.Relationships)
{
ITable possibleAssociationTable = null;
if (entity1.MappedTables().Contains(relationship.PrimaryTable) &&
Cardinality.IsOneToMany(relationship.ForeignCardinality, relationship.PrimaryCardinality))
{
possibleAssociationTable = relationship.ForeignTable;
CardinalityPrimary = relationship.PrimaryCardinality;
mainKey = relationship.ForeignKey;
}
else if (entity1.MappedTables().Contains(relationship.ForeignTable) &&
Cardinality.IsOneToMany(relationship.PrimaryCardinality, relationship.ForeignCardinality))
{
possibleAssociationTable = relationship.PrimaryTable;
CardinalityPrimary = relationship.ForeignCardinality;
mainKey = relationship.PrimaryKey;
}
if (possibleAssociationTable != null)
{
foreach (ITable otherTable in secondEntity.MappedTables())
{
foreach (Relationship otherRelationship in otherTable.Relationships.Where(r => r.PrimaryTable == possibleAssociationTable || r.ForeignTable == possibleAssociationTable))
{
if (otherRelationship.PrimaryTable == otherTable &&
Cardinality.IsOneToMany(otherRelationship.ForeignCardinality, otherRelationship.PrimaryCardinality) &&
possibleAssociationTable.Relationships.Where(r => r.PrimaryTable == otherRelationship.ForeignTable || r.ForeignTable == otherRelationship.ForeignTable).Count() > 0)
{
unpureAssociationTable = otherRelationship.ForeignTable;
CardinalityForeign = otherRelationship.PrimaryCardinality;
associationKey = otherRelationship.ForeignKey;
return unpureAssociationTable;
}
else if (otherRelationship.ForeignTable == otherTable &&
Cardinality.IsOneToMany(otherRelationship.PrimaryCardinality, otherRelationship.ForeignCardinality) &&
possibleAssociationTable.Relationships.Where(r => r.PrimaryTable == otherRelationship.PrimaryTable || r.ForeignTable == otherRelationship.PrimaryTable).Count() > 0)
{
unpureAssociationTable = otherRelationship.PrimaryTable;
CardinalityForeign = otherRelationship.ForeignCardinality;
associationKey = otherRelationship.PrimaryKey;
return unpureAssociationTable;
}
}
}
}
}
}
}
return null;
}
private void Clear()
{
CardinalityPrimary = null;
CardinalityForeign = null;
AssociationTable = null;
SelectedRelationship = null;
}
private bool IsSelectionValidForEntityRequestor(Entity selectedEntity)
{
List<ITable> selectedEntitiesTables = selectedEntity.MappedTables().ToList();
List<Relationship> validRelationships = new List<Relationship>();
List<ITable> validAssociationTables = new List<ITable>();
if (selectedEntitiesTables.Count == 1 &&
Entity.MappedTables().Count() == 1 &&
selectedEntitiesTables[0] == Entity.MappedTables().ElementAt(0))
{
// Table Per Hierarchy inheritance
return true;
}
if (RequestorType == RequestorTypes.Entity_Select_Parent &&
selectedEntitiesTables.Count == 0)
{
bool isOk = true;
foreach (Property property in selectedEntity.Properties)
{
if (Entity.Properties.Count(p => p.Name == property.Name && p.Type == property.Type) == 0)
{
isOk = false;
break;
}
}
// This is OK for Table Per Concrete Class inheritance - the Base is totally virtual and doesn't have
// a mapped table in the database, and all of it's properties exist in the child class.
if (isOk)
return true;
}
else if (RequestorType == RequestorTypes.Entity_Select_Child && selectedEntitiesTables.Count > 0)
{
bool isOk = true;
foreach (Property property in Entity.Properties)
{
if (selectedEntity.Properties.Count(p => p.Name == property.Name && p.Type == property.Type) == 0)
{
isOk = false;
break;
}
}
// This is OK for Table Per Concrete Class inheritance - the Base is totally virtual and doesn't have
// a mapped table in the database, and all of it's properties exist in the child class.
if (isOk)
return true;
}
if (SelectedRelationship != null)
return true;
// Check that a relationship or association table exists between the entity and the new selected entity
foreach (ITable table in Entity.MappedTables())
{
foreach (Relationship relationship in table.Relationships)
{
if (selectedEntitiesTables.Contains(relationship.PrimaryTable) ||
selectedEntitiesTables.Contains(relationship.ForeignTable))
{
validRelationships.Add(relationship);
SelectedRelationship = relationship;
if (table == relationship.PrimaryTable)
{
CardinalityPrimary = relationship.PrimaryCardinality;
CardinalityForeign = relationship.ForeignCardinality;
}
else
{
CardinalityPrimary = relationship.ForeignCardinality;
CardinalityForeign = relationship.PrimaryCardinality;
}
break;
}
}
if (SelectedRelationship != null)
break;
}
IKey primaryKey = null;
IKey foreignKey = null;
ITable associationTable = null;
if (validRelationships.Count == 0)
associationTable = Entity.GetAssociationTable(selectedEntity, out CardinalityPrimary, out CardinalityForeign, out primaryKey, out foreignKey);
if (validRelationships.Count == 0 &&
associationTable == null)
{
//MessageBox.Show(this, string.Format("No relationships or association tables exist between {0} and {1}.{2}You need to add a relationship (or association table) between the tables in the database, or add a virtual relationship between these tables in the table-diagrammer.",
// Entity.Name,
// selectedEntity.Name,
// Environment.NewLine), "No valid relationships", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
//Close();
//return;
return false;
}
if (associationTable != null)
AssociationTable = associationTable;
return true;
}
private void buttonOk_Click(object sender, EventArgs e)
{
SelectedEntities = new List<Entity>();
if (checkBoxCreateNewEntity.Checked || RequestorType == RequestorTypes.Entity_Create_Abstract_Parent)
{
if (!CreateNewEntity())
return;
}
else
{
if (SelectedItems.Count > 0)
{
List<string> invalidSelections = new List<string>();
foreach (ListViewItem item in SelectedItems)
{
Entity entity = null;
if (item.Tag is Entity)
entity = (Entity)item.Tag;
else if (item.Tag is EntityRelationshipContainer)
{
EntityRelationshipContainer keyValue = (EntityRelationshipContainer)item.Tag;
entity = keyValue.Entity;
SelectedRelationship = keyValue.Relationship;
CardinalityPrimary = SelectedRelationship.PrimaryCardinality;
CardinalityForeign = SelectedRelationship.ForeignCardinality;
}
else
throw new NotImplementedException("Not handled yet: " + item.Tag.GetType().Name);
if (RequestorType == RequestorTypes.Entity_Select_Existing ||
RequestorType == RequestorTypes.Entity_Select_Child ||
RequestorType == RequestorTypes.Entity_Select_Parent)
{
if (IsSelectionValidForEntityRequestor(entity))
SelectedEntities.Add(entity);
else
invalidSelections.Add(entity.Name);
}
else
SelectedEntities.Add(entity);
}
if (invalidSelections.Count > 0)
{
StringBuilder sb = new StringBuilder();
foreach (string invalidSelection in invalidSelections)
sb.Append(invalidSelection + ", ");
MessageBox.Show(this, string.Format("No relationships or association tables exist between {0} and:{2}{1}.{2}You need to add a relationship (or association table) between the tables in the database, or add a virtual relationship between these tables in the table-diagrammer.",
Entity.Name,
sb.ToString().Trim(',', ' '),
Environment.NewLine), "No valid relationships", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
else
return;
if (SelectedEntity == null && !MultiSelect && SelectedEntities.Count > 0)
SelectedEntity = SelectedEntities[0];
if (RequestorType == RequestorTypes.Entity_Select_Parent &&
SelectedEntity.MappedTables().Count() == 0)
{
// This is a Table Per Concrete Class inheritance, so remove the matching properties from the child.
foreach (Property property in SelectedEntity.Properties)
{
Property childProperty = Entity.Properties.SingleOrDefault(p => p.Name == property.Name && p.Type == property.Type);
if (childProperty == null)
throw new Exception("This is meant to be a TPCC inheritance, but no matching property was found in the child.");
Entity.RemoveProperty(childProperty);
}
}
}
if (!MultiSelect)
if (SelectedEntities.Count > 0)
SelectedEntity = SelectedEntities[0];
//else
// SelectedEntity = null;
Close();
}
