protected internal override Expression VisitIsNull(IsNullExpression isNull)
{
sb.Append('(');
this.Visit(isNull.Expression);
sb.Append(") IS NULL");
return(isNull);
}
protected internal virtual Expression VisitIsNull(IsNullExpression isNull)
{
var newExpr = Visit(isNull.Expression);
if (newExpr != isNull.Expression)
{
return(new IsNullExpression(newExpr));
}
return(isNull);
}
protected internal override Expression VisitIsNull(IsNullExpression isNull)
{
var newExpr = MakeSqlValue(Visit(isNull.Expression));
if (newExpr != isNull.Expression)
{
return(new IsNullExpression(newExpr));
}
return(isNull);
}
protected virtual bool CompareIsNull(IsNullExpression a, IsNullExpression b)
{
return(Compare(a.Expression, b.Expression));
}