private SqlLink BuildLink(SqlExpression item, MetaDataMember member, Expression source)
{
if (member.IsAssociation)
{
SqlExpression[] exprs = new SqlExpression[member.Association.ThisKey.Count];
for (int i = 0, n = exprs.Length; i < n; i++)
{
MetaDataMember mm = member.Association.ThisKey[i];
exprs[i] = sql.Member(item, mm.Member);
}
MetaType otherType = member.Association.OtherType;
return(new SqlLink(new object(), otherType, member.Type, typeProvider.From(member.Type), item, member, exprs, null, source));
}
else
{
// if not association link is always based on primary key
MetaType thisType = member.DeclaringType;
System.Diagnostics.Debug.Assert(thisType.IsEntity);
List <SqlExpression> exprs = new List <SqlExpression>();
foreach (MetaDataMember mm in thisType.IdentityMembers)
{
exprs.Add(sql.Member(item, mm.Member));
}
SqlExpression expansion = sql.Member(item, member.Member);
return(new SqlLink(new object(), thisType, member.Type, typeProvider.From(member.Type), item, member, exprs, expansion, source));
}
}
internal SqlExpression ConvertTo(Type clrType, SqlExpression expr)
{
//
// In SQL Server 2008, the new TIME data type cannot be converted to BIGINT, or FLOAT,
// or a bunch of other SQL types.
//
if (clrType.IsGenericType && clrType.GetGenericTypeDefinition() == typeof(Nullable <>))
{
clrType = clrType.GetGenericArguments()[0];
}
bool isClrTimeSpanType = clrType == typeof(TimeSpan);
if (this.IsTimeType(expr))
{
if (isClrTimeSpanType)
{
// no conversion necessary
return(expr);
}
expr = ConvertToDateTime(expr);
}
return(UnaryConvert(clrType, typeProvider.From(clrType), expr, expr.SourceExpression));
}
