internal override SqlNode VisitMember(SqlMember m)
{
m.Expression = this.VisitExpression(m.Expression);
if (IsNullableValue(m))
{
return(sql.UnaryValueOf(m.Expression, m.SourceExpression));
}
else if (IsNullableHasValue(m))
{
return(sql.Unary(SqlNodeType.IsNotNull, m.Expression, m.SourceExpression));
}
return(m);
}
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));
}
}
internal static bool CanConvert(SqlNode node)
{
SqlBinary bo = node as SqlBinary;
if (bo != null && (IsCompareToValue(bo) || IsVbCompareStringEqualsValue(bo)))
{
return(true);
}
SqlMember sm = node as SqlMember;
if (sm != null && IsSupportedMember(sm))
{
return(true);
}
SqlMethodCall mc = node as SqlMethodCall;
if (mc != null && (IsSupportedMethod(mc) || IsSupportedVbHelperMethod(mc)))
{
return(true);
}
return(false);
}
internal virtual SqlNode VisitMember(SqlMember m)
{
m.Expression = this.VisitExpression(m.Expression);
return(m);
}
internal override SqlNode VisitMember(SqlMember m)
{
return(new SqlMember(m.ClrType, m.SqlType, (SqlExpression)this.Visit(m.Expression), m.Member));
}
internal override SqlNode VisitMember(SqlMember m) => new SqlMember(m.ClrType, m.SqlType, (SqlExpression)Visit(m.Expression), m.Member);
private static bool IsNullableHasValue(SqlMember m)
{
return(TypeSystem.IsNullableType(m.Expression.ClrType) && m.Member.Name == "HasValue");
}
private static bool IsSupportedMember(SqlMember m)
{
return(IsNullableHasValue(m) || IsNullableHasValue(m));
}
