/// <summary>
/// Gets the foreign keys for the given entity type that point to other entity types
/// sharing the same table-like store object.
/// </summary>
/// <param name="entityType">The entity type.</param>
/// <param name="storeObject">The identifier of the store object.</param>
public static IEnumerable <IReadOnlyForeignKey> FindRowInternalForeignKeys(
this IReadOnlyEntityType entityType,
StoreObjectIdentifier storeObject)
{
var primaryKey = entityType.FindPrimaryKey();
if (primaryKey == null)
{
yield break;
}
foreach (var foreignKey in entityType.GetForeignKeys())
{
var principalEntityType = foreignKey.PrincipalEntityType;
if (!foreignKey.PrincipalKey.IsPrimaryKey() ||
principalEntityType == foreignKey.DeclaringEntityType ||
!foreignKey.IsUnique
#pragma warning disable EF1001 // Internal EF Core API usage.
|| !PropertyListComparer.Instance.Equals(foreignKey.Properties, primaryKey.Properties))
#pragma warning restore EF1001 // Internal EF Core API usage.
{
continue;
}
switch (storeObject.StoreObjectType)
{
case StoreObjectType.Table:
if (storeObject.Name == principalEntityType.GetTableName() &&
storeObject.Schema == principalEntityType.GetSchema())
{
yield return(foreignKey);
}
break;
case StoreObjectType.View:
if (storeObject.Name == principalEntityType.GetViewName() &&
storeObject.Schema == principalEntityType.GetViewSchema())
{
yield return(foreignKey);
}
break;
case StoreObjectType.Function:
if (storeObject.Name == principalEntityType.GetFunctionName())
{
yield return(foreignKey);
}
break;
default:
throw new NotSupportedException(storeObject.StoreObjectType.ToString());
}
}
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public int Compare(string?x, string?y)
{
var xIndex = -1;
var yIndex = -1;
var properties = _entityType.FindPrimaryKey()?.Properties;
if (properties != null)
{
for (var i = 0; i < properties.Count; i++)
{
var name = properties[i].Name;
if (name == x)
{
xIndex = i;
}
if (name == y)
{
yIndex = i;
}
}
}
// Neither property is part of the Primary Key
// Compare the property names
if (xIndex == -1 &&
yIndex == -1)
{
return(StringComparer.Ordinal.Compare(x, y));
}
// Both properties are part of the Primary Key
// Compare the indices
if (xIndex > -1 &&
yIndex > -1)
{
return(xIndex - yIndex);
}
// One property is part of the Primary Key
// The primary key property is first
return(xIndex > yIndex
? -1
: 1);
}
public static IReadOnlyKey?FindDeclaredPrimaryKey([NotNull] this IReadOnlyEntityType entityType) => entityType.BaseType == null?entityType.FindPrimaryKey() : null;
