internal ForeignKeyConstraint(md.RelationshipType relType, md.RelationshipSet relationshipSet, md.ReferentialConstraint constraint)
{
md.AssociationSet assocSet = relationshipSet as md.AssociationSet;
md.AssociationEndMember fromEnd = constraint.FromRole as md.AssociationEndMember;
md.AssociationEndMember toEnd = constraint.ToRole as md.AssociationEndMember;
// Currently only Associations are supported
if (null == assocSet || null == fromEnd || null == toEnd)
{
throw EntityUtil.NotSupported();
}
m_constraint = constraint;
md.EntitySet parent = System.Data.Common.Utils.MetadataHelper.GetEntitySetAtEnd(assocSet, fromEnd); // relationshipSet.GetRelationshipEndExtent(constraint.FromRole);
md.EntitySet child = System.Data.Common.Utils.MetadataHelper.GetEntitySetAtEnd(assocSet, toEnd); // relationshipSet.GetRelationshipEndExtent(constraint.ToRole);
m_extentPair = new ExtentPair(parent, child);
m_childKeys = new List <string>();
foreach (md.EdmProperty prop in constraint.ToProperties)
{
m_childKeys.Add(prop.Name);
}
m_parentKeys = new List <string>();
foreach (md.EdmProperty prop in constraint.FromProperties)
{
m_parentKeys.Add(prop.Name);
}
PlanCompiler.Assert((md.RelationshipMultiplicity.ZeroOrOne == fromEnd.RelationshipMultiplicity || md.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);
}
/// <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);
ExtentPair extentPair = new ExtentPair(table1, table2);
return(m_parentChildRelationships.TryGetValue(extentPair, out constraints));
}
internal ForeignKeyConstraint(md.RelationshipType relType, md.RelationshipSet relationshipSet, md.ReferentialConstraint constraint)
{
md.AssociationSet assocSet = relationshipSet as md.AssociationSet;
md.AssociationEndMember fromEnd = constraint.FromRole as md.AssociationEndMember;
md.AssociationEndMember toEnd = constraint.ToRole as md.AssociationEndMember;
// Currently only Associations are supported
if (null == assocSet || null == fromEnd || null == toEnd)
{
throw EntityUtil.NotSupported();
}
m_constraint = constraint;
md.EntitySet parent = System.Data.Common.Utils.MetadataHelper.GetEntitySetAtEnd(assocSet, fromEnd);// relationshipSet.GetRelationshipEndExtent(constraint.FromRole);
md.EntitySet child = System.Data.Common.Utils.MetadataHelper.GetEntitySetAtEnd(assocSet, toEnd);// relationshipSet.GetRelationshipEndExtent(constraint.ToRole);
m_extentPair = new ExtentPair(parent, child);
m_childKeys = new List<string>();
foreach (md.EdmProperty prop in constraint.ToProperties)
{
m_childKeys.Add(prop.Name);
}
m_parentKeys = new List<string>();
foreach (md.EdmProperty prop in constraint.FromProperties)
{
m_parentKeys.Add(prop.Name);
}
PlanCompiler.Assert((md.RelationshipMultiplicity.ZeroOrOne == fromEnd.RelationshipMultiplicity || md.RelationshipMultiplicity.One == fromEnd.RelationshipMultiplicity), "from-end of relationship constraint cannot have multiplicity greater than 1");
}
/// <summary>
/// Equals
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(object obj)
{
ExtentPair other = obj as ExtentPair;
return((other != null) && other.Left.Equals(this.Left) && other.Right.Equals(this.Right));
}