internal SqlExpression BuildProjection(SqlExpression item, MetaType rowType, bool allowDeferred, SqlLink link, Expression source)
{
if (!rowType.HasInheritance)
{
return(BuildProjectionInternal(item, rowType, (rowType.Table != null) ? rowType.PersistentDataMembers : rowType.DataMembers, allowDeferred, link, source));
}
var list = new List <MetaType>(rowType.InheritanceTypes);
var list2 = new List <SqlTypeCaseWhen>();
SqlTypeCaseWhen sqlTypeCaseWhen = null;
var inheritanceRoot = rowType.InheritanceRoot;
var discriminator = inheritanceRoot.Discriminator;
var type = discriminator.Type;
var sqlMember = sql.Member(item, discriminator.Member);
foreach (var item2 in list)
{
if (item2.HasInheritanceCode)
{
var typeBinding = BuildProjectionInternal(item, item2, item2.PersistentDataMembers, allowDeferred, link, source);
if (item2.IsInheritanceDefault)
{
sqlTypeCaseWhen = new SqlTypeCaseWhen(null, typeBinding);
}
object value = InheritanceRules.InheritanceCodeForClientCompare(item2.InheritanceCode, sqlMember.SqlType);
var match = sql.Value(type, sql.Default(discriminator), value, true, source);
list2.Add(new SqlTypeCaseWhen(match, typeBinding));
}
}
if (sqlTypeCaseWhen == null)
{
throw Error.EmptyCaseNotSupported();
}
list2.Add(sqlTypeCaseWhen);
return(sql.TypeCase(inheritanceRoot.Type, inheritanceRoot, sqlMember, list2.ToArray(), source));
}
internal SqlExpression BuildProjection(SqlExpression item, MetaType rowType, bool allowDeferred, SqlLink link, Expression source)
{
if (!rowType.HasInheritance)
{
return(this.BuildProjectionInternal(item, rowType, (rowType.Table != null) ? rowType.PersistentDataMembers : rowType.DataMembers, allowDeferred, link, source));
}
else
{
// Build a type case that represents a switch between the various type.
List <MetaType> mappedTypes = new List <MetaType>(rowType.InheritanceTypes);
List <SqlTypeCaseWhen> whens = new List <SqlTypeCaseWhen>();
SqlTypeCaseWhen @else = null;
MetaType root = rowType.InheritanceRoot;
MetaDataMember discriminator = root.Discriminator;
Type dt = discriminator.Type;
SqlMember dm = sql.Member(item, discriminator.Member);
foreach (MetaType type in mappedTypes)
{
if (type.HasInheritanceCode)
{
SqlNew defaultProjection = this.BuildProjectionInternal(item, type, type.PersistentDataMembers, allowDeferred, link, source);
if (type.IsInheritanceDefault)
{
@else = new SqlTypeCaseWhen(null, defaultProjection);
}
// Add an explicit case even for the default.
// Redundant results will be optimized out later.
object code = InheritanceRules.InheritanceCodeForClientCompare(type.InheritanceCode, dm.SqlType);
SqlExpression match = sql.Value(dt, sql.Default(discriminator), code, true, source);
whens.Add(new SqlTypeCaseWhen(match, defaultProjection));
}
}
if (@else == null)
{
throw Error.EmptyCaseNotSupported();
}
whens.Add(@else); // Add the else at the end.
return(sql.TypeCase(root.Type, root, dm, whens.ToArray(), source));
}
}
