protected DbIsNullExpression UpdateIsNull(DbIsNullExpression isnull,
Expression expression)
{
if (expression != isnull.Expression)
{
return(new DbIsNullExpression(expression));
}
return(isnull);
}
protected DbIsNullExpression UpdateIsNull(DbIsNullExpression isnull,
Expression expression)
{
if (expression != isnull.Expression)
return new DbIsNullExpression(expression);
return isnull;
}
protected virtual Expression VisitIsNull(DbIsNullExpression isnull)
{
Expression expr = Visit(isnull.Expression);
return UpdateIsNull(isnull, expr);
}
protected virtual bool CompareIsNull(DbIsNullExpression a, DbIsNullExpression b)
{
return(Compare(a.Expression, b.Expression));
}
protected override Expression VisitIsNull(DbIsNullExpression isnull)
{
this.VisitValue(isnull.Expression);
this.Write(" IS NULL");
return isnull;
}
protected virtual bool CompareIsNull(DbIsNullExpression a, DbIsNullExpression b)
{
return Compare(a.Expression, b.Expression);
}
protected virtual Expression VisitIsNull(DbIsNullExpression isnull)
{
Expression expr = Visit(isnull.Expression);
return(UpdateIsNull(isnull, expr));
}