In the config sequence I would like to create a conditional constraint. I have two clock rates and only a set of combinations of the clock rates are legal in the design.
I am having trouble coming up with the correct syntax to achieve this.The use of case or if statements give me a syntax error. This is what I have right now.
case main_clk{
1e6:{
keep div_clk == select{
80: 5e9;
20: 5.6e9;
};
};
.
.
.
};
I also tried using when but it didn't work. Any suggestions on how I can implement this?
First of all, I see from you using scientific notation from your numbers that you are using real fields. You should probably switch to using uint fields as they are more flexible from a generation point of view.
The case statement is procedural and cannot be used for generation. The same goes for if. To generate a field conditionally on the other you need to use the => (implication) operator:
keep main_clk == 1e6 =>
soft div_clk == select {
80: 5e9;
20: 5.6e9;
};
You need one such implication for each possible value of main_clk.
Related
I'm attempting to create a parameter for when jodrtg.fdescnum <> inmastx.fbin1. I want to be able to use this in a dropdown list selection for my report. I have tried a number of combinations but keep getting syntax errors near the <or =.I'd be appreciative if anyone can point me in the right direction. I've never tried using two fields to create a single parameter before.
This what I've been attempting to get as my final result.
jodrtg.fdescnum <> inmastx.fbin1 = #MoldPress
I learned that you can only use one operator at a time but they can be combined using bool logic.
WHERE (jodrtg.fdescnum <> inmastx.fbin1
OR #ParameterName = 'Unfiltered')
AND (jodrtg.fdescnum <> inmastx.fbin1) OR #MoldPress = 0
I'm new to SQL and Postgres, so hopefully this isn't too hard to figure out for all of you.
I'm trying to use a Position function within a CASE statement, but I keep getting the error
"ERROR: Syntax error at or near ""Project"". LINE 2: CASE WHEN position('(' IN "Project") >0 THEN".
I've used this position function before and it worked fine, so I'm confused what the problem is here. I've also tried the table name, such as "xyztable.Project" and "Project" - both without quotation marks.
Here is the entire statement:
SELECT "Project",
CASE WHEN postion('(' IN "Project") >0 THEN
substring("Project",position('(' IN "Project")+1,position(')' IN "Project")-2)
CASE WHEN postion('('IN "Project") IS NULL THEN
"Project"
END
FROM "2015Budget";
As I haven't gotten to past the second line of this statement, if anyone sees anything that would prevent this statement from running correctly, please feel free to point it out.
New Statement:
SELECT "Project",
CASE
WHEN position('(' IN "Project") >0 THEN
substring("Project",position('(' IN "Project")+1,position(')' IN "Project")-2)
WHEN position('('IN "Project") IS NULL THEN
"Project"
END
FROM "2015Budget";
Thank you for your help!!
The error is due to a simple typo - postion instead of position.
You would generally get a much more comprehensible error message in situations like this (e.g. "function postion(text,text) does not exist"). However, the use of function-specific keywords as argument separators (as mandated by the SQL standard) makes this case much more difficult for the parser to cope with.
After fixing this, you'll run into another error. Note that the general form of a multi-branch CASE expression is:
CASE
WHEN <condition1> THEN <value1>
WHEN <condition2> THEN <value2>
...
END
Ok, I've been stuggling with this one for a while, and have spent a lot of time trying different things to do something that I have done very easily using PHP.
I am trying to iterate over a list while keeping track of a variable locally, while spitting out HTML attempting to populate a table.
Attempt #1:
#{
var curDate : Date = null
for(ind <- indicators){
if(curDate == null || !curDate.equals(ind.getFirstFound())){
curDate = ind.getFirstFound()
<tr><th colspan='5' class='day'>#(ind.getFirstFound())</th></tr>
<tr><th>Document ID</th><th>Value</th><th>Owner</th><th>Document Title / Comment</th></tr>
}
}
}
I attempt too user a scala block statement to allow me to keep curDate as a variable within the created scope. This block correctly maintains curDate state, but does not allow me to output anything to the DOM. I did not actually expect this to compile, due to my unescaped, randomly thrown in HTML, but it does. this loop simply places nothing on the DOM, although the decision structure is correctly executed on the server.
I tried escaping using #Html('...'), but that produced compile errors.
Attempt #2:
A lot of google searches led me to the "for comprehension":
#for(ind <- indicators; curDate = ind.getFirstFound()){
#if(curDate == null || !curDate.equals(ind.getFirstFound())){
#(curDate = ind.getFirstFound())
}
<tr><th colspan='5' class='day'>#(ind.getFirstFound())</th></tr>
<tr><th>Document ID</th><th>Value</th><th>Owner</th><th>Document Title / Comment</th></tr>
}
Without the if statement in this block, this is the closest I got to doing what I actually wanted, but apparently I am not allowed to reassign a non-reference type, which is why I was hoping attempt #1's reference declaration of curDate : Date = null would work. This attempt gets me the HTML on the page (again, if i remove the nested if statement) but doesn't get me the
My question is, how do i implement this intention? I am very painfully aware of my lack of Scala knowledge, which is being exacerbated by Play templating syntax. I am not sure what to do.
Thanks in advance!
Play's template language is very geared towards functional programming. It might be possible to achieve what you want to achieve using mutable state, but you'll probably be best going with the flow, and using a functional solution.
If you want to maintain state between iterations of a loop in functional programming, that can be done by doing a fold - you start with some state, and on each iteration, you get the previous state and the next element, and you then return the new state based on those two things.
So, looking at your first solution, it looks like what you're trying to do is only print an element out if it's date is different from the previous one, is that correct? Another way of putting this is you want to filter out all the elements that have a date that's the same date as the previous one. Expressing that in terms of a fold, we're going to fold the elements into a sequence (our initial state), and if the last element of the folded sequence has a different date to the current one, we add it, otherwise we ignore it.
Our fold looks like this:
indicators.foldLeft(Vector.empty[Indicator]) { (collected, next) =>
if (collected.lastOption.forall(_.getFirstFound != next.getFirstFound)) {
collected :+ next
} else {
collected
}
}
Just to explain the above, we're folding into a Vector because Vector has constant time append and last, List has n time. The forall will return true if there is no last element in collected, otherwise if there is, it will return true if the passed in lambda evaluates to true. And in Scala, == invokes .equals (after doing a null check), so you don't need to use .equals in Scala.
So, putting this in a template:
#for(ind <- indicators.foldLeft(Vector.empty[Indicator]) { (collected, next) =>
if (collected.lastOption.forall(_.getFirstFound != next.getFirstFound)) {
collected :+ next
} else {
collected
}
}){
...
}
I'm a total erlang noob and I just want to see what's in a particular table I have. I want to just "select *" from a particular table to start with. The examples I'm seeing, such as the official documentation, all have column restrictions which I don't really want. I don't really know how to form the MatchHead or Guard to match anything (aka "*").
A very simple primer on how to just get everything out of a table would be very appreciated!
For example, you can use qlc:
F = fun() ->
Q = qlc:q([R || R <- mnesia:table(foo)]),
qlc:e(Q)
end,
mnesia:transaction(F).
The simplest way to do it is probably mnesia:dirty_match_object:
mnesia:dirty_match_object(foo, #foo{_ = '_'}).
That is, match everything in the table foo that is a foo record, regardless of the values of the fields (every field is '_', i.e. wildcard). Note that since it uses record construction syntax, it will only work in a module where you have included the record definition, or in the shell after evaluating rr(my_module) to make the record definition available.
(I expected mnesia:dirty_match_object(foo, '_') to work, but that fails with a bad_type error.)
To do it with select, call it like this:
mnesia:dirty_select(foo, [{'_', [], ['$_']}]).
Here, MatchHead is _, i.e. match anything. The guards are [], an empty list, i.e. no extra limitations. The result spec is ['$_'], i.e. return the entire record. For more information about match specs, see the match specifications chapter of the ERTS user guide.
If an expression is too deep and gets printed with ... in the shell, you can ask the shell to print the entire thing by evaluating rp(EXPRESSION). EXPRESSION can either be the function call once again, or v(-1) for the value returned by the previous expression, or v(42) for the value returned by the expression preceded by the shell prompt 42>.
Using C# 3.5 through VS 2008 and subsonic 2.2.
Anyone know if it's possible to create a subsonic query that essentially has an 'IF' in the middle of it, depending on whether a passed parameter was, for example, greater than zero.
For example, a delete method that has two passed parameters - A and B.
I want something like (pseudo code)
DELETE from Products
Where productId = A
if(B > 0)
{
AND ProductAttributeId = B
}
Obviously it wouldn't need the actual 'IF' clause in there but that's the essence of what I'm trying to do with subsonic. I know I can just have two different queries depending on whether the parameter is there or not but I was wondering if there's a cleaner way of doing it.
Thanks.
That's how I usually do it - it's not two queries, but one SqlQuery with optionally added constraints:
SqlSquery q = DAL.DB.Delete()
.From<DAL.Product()
.Where(DAL.Product.ProductIdColumn).IsEqualTo(A);
if (B > 0)
{
q.And(DAL.Product.ProductAttributeIdColumn).IsEqualTo(B);
}
q.Execute();
There may be a typo, I can't test this right now.