internal ForeignKeyConstraint(RelationshipSet relationshipSet, ReferentialConstraint constraint)
{
var assocSet = relationshipSet as AssociationSet;
var fromEnd = constraint.FromRole as AssociationEndMember;
var toEnd = constraint.ToRole as AssociationEndMember;
// Currently only Associations are supported
if (null == assocSet || null == fromEnd
|| null == toEnd)
{
throw new NotSupportedException();
}
m_constraint = constraint;
var parent = MetadataHelper.GetEntitySetAtEnd(assocSet, fromEnd);
// relationshipSet.GetRelationshipEndExtent(constraint.FromRole);
var child = MetadataHelper.GetEntitySetAtEnd(assocSet, toEnd); // relationshipSet.GetRelationshipEndExtent(constraint.ToRole);
m_extentPair = new ExtentPair(parent, child);
m_childKeys = new List<string>();
foreach (var prop in constraint.ToProperties)
{
m_childKeys.Add(prop.Name);
}
m_parentKeys = new List<string>();
foreach (var prop in constraint.FromProperties)
{
m_parentKeys.Add(prop.Name);
}
PlanCompiler.Assert(
(RelationshipMultiplicity.ZeroOrOne == fromEnd.RelationshipMultiplicity
|| RelationshipMultiplicity.One == fromEnd.RelationshipMultiplicity),
"from-end of relationship constraint cannot have multiplicity greater than 1");
}
/// <summary>
/// Is there a parent child relationship between table1 and table2 ?
/// </summary>
/// <param name="table1"> parent table ? </param>
/// <param name="table2"> child table ? </param>
/// <param name="constraints"> list of constraints ? </param>
/// <returns> true if there is at least one constraint </returns>
internal bool IsParentChildRelationship(
md.EntitySetBase table1, md.EntitySetBase table2,
out List<ForeignKeyConstraint> constraints)
{
LoadRelationships(table1.EntityContainer);
LoadRelationships(table2.EntityContainer);
var extentPair = new ExtentPair(table1, table2);
return m_parentChildRelationships.TryGetValue(extentPair, out constraints);
}
public override bool Equals(object obj)
{
ExtentPair extentPair = obj as ExtentPair;
if (extentPair != null && extentPair.Left.Equals((object)this.Left))
{
return(extentPair.Right.Equals((object)this.Right));
}
return(false);
}
// <summary>
// Is there a parent child relationship between table1 and table2 ?
// </summary>
// <param name="table1"> parent table ? </param>
// <param name="table2"> child table ? </param>
// <param name="constraints"> list of constraints ? </param>
// <returns> true if there is at least one constraint </returns>
internal bool IsParentChildRelationship(
md.EntitySetBase table1, md.EntitySetBase table2,
out List <ForeignKeyConstraint> constraints)
{
LoadRelationships(table1.EntityContainer);
LoadRelationships(table2.EntityContainer);
var extentPair = new ExtentPair(table1, table2);
return(m_parentChildRelationships.TryGetValue(extentPair, out constraints));
}
internal ForeignKeyConstraint(RelationshipSet relationshipSet, ReferentialConstraint constraint)
{
var assocSet = relationshipSet as AssociationSet;
var fromEnd = constraint.FromRole as AssociationEndMember;
var toEnd = constraint.ToRole as AssociationEndMember;
// Currently only Associations are supported
if (null == assocSet ||
null == fromEnd ||
null == toEnd)
{
throw new NotSupportedException();
}
m_constraint = constraint;
var parent = MetadataHelper.GetEntitySetAtEnd(assocSet, fromEnd);
// relationshipSet.GetRelationshipEndExtent(constraint.FromRole);
var child = MetadataHelper.GetEntitySetAtEnd(assocSet, toEnd); // relationshipSet.GetRelationshipEndExtent(constraint.ToRole);
m_extentPair = new ExtentPair(parent, child);
m_childKeys = new List <string>();
foreach (var prop in constraint.ToProperties)
{
m_childKeys.Add(prop.Name);
}
m_parentKeys = new List <string>();
foreach (var prop in constraint.FromProperties)
{
m_parentKeys.Add(prop.Name);
}
PlanCompiler.Assert(
(RelationshipMultiplicity.ZeroOrOne == fromEnd.RelationshipMultiplicity ||
RelationshipMultiplicity.One == fromEnd.RelationshipMultiplicity),
"from-end of relationship constraint cannot have multiplicity greater than 1");
}
internal ForeignKeyConstraint(RelationshipSet relationshipSet, ReferentialConstraint constraint)
{
AssociationSet associationSet = relationshipSet as AssociationSet;
AssociationEndMember fromRole = constraint.FromRole as AssociationEndMember;
AssociationEndMember toRole = constraint.ToRole as AssociationEndMember;
if (associationSet == null || fromRole == null || toRole == null)
{
throw new NotSupportedException();
}
this.m_constraint = constraint;
this.m_extentPair = new ExtentPair((EntitySetBase)MetadataHelper.GetEntitySetAtEnd(associationSet, fromRole), (EntitySetBase)MetadataHelper.GetEntitySetAtEnd(associationSet, toRole));
this.m_childKeys = new List <string>();
foreach (EdmMember toProperty in constraint.ToProperties)
{
this.m_childKeys.Add(toProperty.Name);
}
this.m_parentKeys = new List <string>();
foreach (EdmMember fromProperty in constraint.FromProperties)
{
this.m_parentKeys.Add(fromProperty.Name);
}
System.Data.Entity.Core.Query.PlanCompiler.PlanCompiler.Assert(fromRole.RelationshipMultiplicity == RelationshipMultiplicity.ZeroOrOne || RelationshipMultiplicity.One == fromRole.RelationshipMultiplicity, "from-end of relationship constraint cannot have multiplicity greater than 1");
}
