Best way to distribute configuration values to subVIs

I have a main VI with ~10 subVIs, all of which have a number of default constants embedded. I want to change my architecture so that all the constants are moved to a single ASCII text file which is not changed during program execution. I'm trying to decide the best way to do this:
- Read the file every time a subvi is opened (this is frequent).
- Use the "Read Key" function (this may be essentially the same).
- Read the file once at the beginning of execution, and store the values in a cluster which is passed to each subVI.
- Read the file once at the beginning of execution, and store the values in several clusters, passing only the needed values to a given subVI.
- Read the file once at the beginning of execution, and store the values in a functional (LV2) global which is read by each subVI when it is called.
I think all of these would work, but what would be the most efficient in terms of programming time, execution time, memory usage, and ease of future modification? I'm leaning toward the multiple clusters approach so that I'm not constantly reading a file each time a subVI opens.
Thanks to all,
James

Consider using what I call a "manager" VI. Its purpose is to manage the file for you.
You call it whever you want to know one of these parameters.
It knows whether it's read the file yet or not. If not, it does so on first call.
After that, it simply keeps all your values in its own memory (shift registers).
When you call it, it simply gives you the value(s) out of its memory, either as a big cluster, or as separated values.
That way, you only read the file once.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

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    VALUES     ('3', '1', '0170', 'X928 ', 'CP', 0, 0, 9.6, 0, 0, 255.2, TO_DATE('11/06/2009', 'mm/dd/yyyy'), TO_DATE('11/06/2009', 'mm/dd/yyyy'), 5, 5, 5, 0, 0);
    INSERT INTO     op_detail
    VALUES     ('3', '1', '0130', 'H212 ', 'CP', .5, .1, 0, .6, .03, 0, TO_DATE('10/21/2009', 'mm/dd/yyyy'), TO_DATE('10/21/2009', 'mm/dd/yyyy'), 5, 5, 5, 0, 0);
    INSERT INTO     op_detail
    VALUES     ('3', '1', '0550', 'R501 ', 'WK', 1, 16, 0, 2.2, 12.4, 0, TO_DATE('05/19/2010', 'mm/dd/yyyy'), TO_DATE('12/31/1900', 'mm/dd/yyyy'), 5, 5, 5, 0, 0);
    INSERT INTO     op_detail
    VALUES     ('3', '1', '0324', 'Y000 ', 'CL', .1, .2, 0, 0, .07, 0, TO_DATE('02/04/2010', 'mm/dd/yyyy'), TO_DATE('02/04/2010', 'mm/dd/yyyy'), 5, 5, 5, 0, 0);
    INSERT INTO     op_detail
    VALUES     ('4', '1', '0324', 'Y000 ', 'CP', .1, .2, 0, 0, .59, 0, TO_DATE('02/06/2004', 'mm/dd/yyyy'), TO_DATE('02/06/2004', 'mm/dd/yyyy'), 4, 4, 4, 0, 0);This is the query I'm working with right now:
    SELECT     o.part_nbr               
    ,          s.major_seq_nbr          AS op_nbr
    ,          CASE          -- CASE statement to replace similar-to wctr_id's with a single new wctr_id, so we can treat them as the same
                   WHEN     s.wctr_id     IN ('H211','H212')
                   THEN     'Z211'
                   ELSE     s.wctr_id
              END                         AS wctr
    ,          MIN(s.plan_su_rsrc)          AS min_plan_setup
    ,          AVG(s.plan_su_rsrc)          AS avg_plan_setup
    ,          MAX(s.plan_su_rsrc)          AS max_plan_setup
    ,          STDDEV(s.plan_su_rsrc)     AS sdev_plan_setup
    ,          MIN(s.plan_run_rsrc)     AS min_plan_run
    ,          AVG(s.plan_run_rsrc)     AS avg_plan_run
    ,          MAX(s.plan_run_rsrc)     AS max_plan_run
    ,          STDDEV(s.plan_run_rsrc)     AS sdev_plan_run
    ,          MIN(s.plan_subc_amt)     AS min_plan_subc
    ,          AVG(s.plan_subc_amt)     AS avg_plan_subc
    ,          MAX(s.plan_subc_amt)     AS max_plan_subc
    ,          STDDEV(s.plan_subc_amt)     AS sdev_plan_subc
    ,          MIN(s.act_su_rsrc)          AS min_act_setup
    ,          AVG(s.act_su_rsrc)          AS avg_act_setup
    ,          MAX(s.act_su_rsrc)          AS max_act_setup
    ,          STDDEV(s.act_su_rsrc)     AS sdev_act_setup
    ,          MIN(s.act_run_rsrc)          AS min_act_run
    ,          AVG(s.act_run_rsrc)          AS avg_act_run
    ,          MAX(s.act_run_rsrc)          AS max_act_run
    ,          STDDEV(s.act_run_rsrc)     AS sdev_act_run
    ,          MIN(s.act_subc_amt)          AS min_act_subc
    ,          AVG(s.act_subc_amt)          AS avg_act_subc
    ,          MAX(s.act_subc_amt)          AS max_act_subc
    ,          STDDEV(s.act_subc_amt)     AS sdev_act_subc     
    ,          MIN(s.act_start_dt)          AS min_start
    ,          MAX(s.act_start_dt)          AS max_start
    ,          MIN(s.dt_completed)          AS min_comp
    ,          MAX(s.dt_completed)          AS max_comp
    ,          MIN(s.qty_planned)          AS min_qty_plan
    ,          AVG(s.qty_planned)          AS avg_qty_plan
    ,          MAX(s.qty_planned)          AS max_qty_plan
    ,          STDDEV(s.qty_planned)     AS sdev_qty_plan
    ,          MIN(s.qty_recvd)          AS min_qty_recvd
    ,          AVG(s.qty_recvd)          AS avg_qty_recvd
    ,          MAX(s.qty_recvd)          AS max_qty_recvd
    ,          STDDEV(s.qty_recvd)          AS sdev_qty_recvd
    ,          MIN(s.qty_complete)          AS min_qty_comp
    ,          AVG(s.qty_complete)          AS avg_qty_comp
    ,          MAX(s.qty_complete)          AS max_qty_comp
    ,          STDDEV(s.qty_complete)     AS sdev_qty_comp
    ,          MIN(s.qty_scrap)          AS min_qty_scrap
    ,          AVG(s.qty_scrap)          AS avg_qty_scrap
    ,          MAX(s.qty_scrap)          AS max_qty_scrap
    ,          STDDEV(s.qty_scrap)          AS sdev_qty_scrap
    ,          MIN(s.qty_on_hold)          AS min_qty_hold
    ,          AVG(s.qty_on_hold)          AS avg_qty_hold
    ,          MAX(s.qty_on_hold)          AS max_qty_hold
    ,          STDDEV(s.qty_on_hold)     AS sdev_qty_hold
    ,          COUNT(*)                    AS rec_cnt
    ,          CASE
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                   THEN     '12 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                   THEN     '24 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                   THEN     '36 mos. back'
                   ELSE '37 mos. back +'
              END                         AS time_period
    FROM          ord_master o
    ,          op_detail     s
    ,          (     -- begin in-line view a, to get the min act_start_dt for each order
              SELECT     s1.ord_nbr
              ,          s1.sub_ord_nbr
              ,          MIN     (
                             CASE
                                  WHEN     s1.act_start_dt     > TO_DATE('01/01/2000','mm/dd/yyyy')
                                  THEN     s1.act_start_dt
                             END
                             )          AS ord_min_start
              FROM          op_detail s1
              GROUP BY     s1.ord_nbr
              ,          s1.sub_ord_nbr
              ) a     -- end in-line view a          
    WHERE     o.ord_nbr          = s.ord_nbr
    AND          o.sub_ord_nbr     = s.sub_ord_nbr
    AND          o.ord_nbr          = a.ord_nbr
    AND          o.sub_ord_nbr     = a.sub_ord_nbr
    AND          o.ord_type     = 'AA'
    AND          o.ord_stat     IN ('CL','OP')
    AND          s.oper_stat     IN ('CL','CP')
    GROUP BY     o.part_nbr
    ,          s.major_seq_nbr
    ,          CASE          -- CASE statement to replace similar-to wctr_id's with a single new wctr_id, so we can treat them as the same
                   WHEN     s.wctr_id     IN ('H211','H212')
                   THEN     'Z211'
                   ELSE     s.wctr_id
              END
    ,          CASE
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                   THEN     '12 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                   THEN     '24 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                   THEN     '36 mos. back'
                   ELSE '37 mos. back +'
              END
    ORDER BY     o.part_nbr
    ,          CASE
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                   THEN     '12 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                   THEN     '24 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                   THEN     '36 mos. back'
                   ELSE '37 mos. back +'
              END
    ,          s.major_seq_nbrThis gives me a bunch of descriptive statistics on some data stored in the database, broken into groups by the time period.
    I have 7 sets of possible values for the column wctr_id that are groups of similar/same work centers, and should be treated as the same, assuming the ord_nbr, sub_ord_nbr, and major_seq_nbr are the same. In my example case statement above, anytime I find 'H211' or 'H212', I am replacing it with 'Z211', which is my new, unique identifier for any wctr in the group ('H211', 'H212'). I have 7 of these sorts of groups that need to be replaced by a new, unique identifier. Is my CASE statement (noted above) the best way to do this, or is there a better way? These groups of similar-to wctr_id's are not listed in a table anywhere.

    Hi,
    As always, thanks for posting the CREATE TABLE and INSERT statements; that's very helpful, and leads to faster, better solutions.
    Another thing that is helpful, and promotes faster, better solutions, is to simplify your problem.
    For example, you have to compute a lot of aggregates, but it looks like you already know how to do that. This problem only involves the CASE expressions, and how they interact with the GROUP BY clause. So just cut out most of the aggregate functions.
    Also, it looks like the intricacies of in-line view a have nothing to do with your current problem. For purposes of posting this problem, pretend that a is a regular view, so it doesn't clutter up the main query.
    I think your problem could be restated like this:
    You already have a query like this:
    CREATE OR REPLACE VIEW a
    AS
              SELECT     s1.ord_nbr
              ,          s1.sub_ord_nbr
              ,          MIN     (
                             CASE
                                  WHEN     s1.act_start_dt     > TO_DATE('01/01/2000','mm/dd/yyyy')
                                  THEN     s1.act_start_dt
                             END
                             )          AS ord_min_start
              FROM          op_detail s1
              GROUP BY     s1.ord_nbr
              ,          s1.sub_ord_nbr
    SELECT     o.part_nbr               
    ,          s.major_seq_nbr          AS op_nbr
    ,          CASE          -- CASE statement to replace similar-to wctr_id's with a single new wctr_id, so we can treat them as the same
                   WHEN     s.wctr_id     IN ('H211','H212')
                   THEN     'Z211'
                   ELSE     s.wctr_id
              END                         AS wctr
    ,          MIN(s.plan_su_rsrc)          AS min_plan_setup
              -- lots of other agtgregates go here in real query
    ,          CASE
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                   THEN     '12 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                   THEN     '24 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                   THEN     '36 mos. back'
                   ELSE '37 mos. back +'
              END                         AS time_period
    FROM          ord_master o
    ,          op_detail     s
    ,          a          -- in real query, a is an in-line view
    WHERE     o.ord_nbr          = s.ord_nbr
    AND          o.sub_ord_nbr     = s.sub_ord_nbr
    AND          o.ord_nbr          = a.ord_nbr
    AND          o.sub_ord_nbr     = a.sub_ord_nbr
    AND          o.ord_type     = 'AA'
    AND          o.ord_stat     IN ('CL','OP')
    AND          s.oper_stat     IN ('CL','CP')
    GROUP BY     o.part_nbr
    ,          s.major_seq_nbr
    ,          CASE          -- CASE statement to replace similar-to wctr_id's with a single new wctr_id, so we can treat them as the same
                   WHEN     s.wctr_id     IN ('H211','H212')
                   THEN     'Z211'
                   ELSE     s.wctr_id
              END
    ,          CASE
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                   THEN     '12 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                   THEN     '24 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                   THEN     '36 mos. back'
                   ELSE '37 mos. back +'
              END
    ORDER BY     o.part_nbr
    ,          CASE
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                   THEN     '12 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                   THEN     '24 mos. back'
                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                   THEN     '36 mos. back'
                   ELSE '37 mos. back +'
              END
    ,          s.major_seq_nbr
    ;that produces this output:
    `                       MIN_
                           PLAN_
    PART_NBR   OP_N WCTR   SETUP TIME_PERIOD
    ABC-123    0081 X516      .0 12 mos. back
    ABC-123    0130 Z211      .5 12 mos. back
    ABC-123    0170 X928      .0 12 mos. back
    ABC-123    0324 Y000      .1 12 mos. back
    ABC-123    0120 H214      .3 24 mos. back
    ABC-123    0122 T203     2.5 24 mos. back
    ABC-123    0130 Z211      .5 24 mos. back
    ABC-123    0170 X928      .0 24 mos. back
    ABC-123    0324 Y000      .1 24 mos. back
    ABC-123    0324 Y000      .1 37 mos. back +The output is correct; the problem is, can we get the same results without 2 copies of the wctr CASE expression, and 3 copies of the time_period CASE expression?
    Is that a fair description of the problem?
    For starters, you can use column aliases in the ORDER BY clause. Unfortunately, that's the only place where you can use column aliases in the same query where they are defined . You can compute them in a sib-query, and then use them in super-queries.
    In other words, wouldn't it be nice if we had a table just like op_detail, but with an additional column called wctr? Make a view: either a regular view (especially if wctr, computed the same way, will be used in several different queries) or an in-line view, as shown below.
    Wouldn't it be great if there was a table that was just like a, except that it had time_period alreay computed? Make a view: either a regular view or an in-line view, as shown below.
    SELECT     o.part_nbr
    ,     s.major_seq_nbr          AS op_nbr
    ,     s.wctr
    ,     MIN(s.plan_su_rsrc)          AS min_plan_setup
         -- lots of other agtgregates go here in real query
    ,     a2.time_period
    FROM     ord_master      o
    ,     (          -- Begin in-line view s, with data from op_detail
                 SELECT  op_detail.*      -- or list all columns needed in main query
              ,     CASE          -- replace similar-to wctr_id's with a single new wctr_id, so we can treat them as the same
                       WHEN     wctr_id        IN ('H211','H212')
                       THEN     'Z211'
                       ELSE     wctr_id
                   END                    AS wctr
              FROM     op_detail
         ) s          -- End in-line view s, with data from op_detail
    ,     (           -- Begin in-line view a2, to compute time_period
              SELECT  a.*
              ,     CASE
                       WHEN ord_min_start     >     ADD_MONTHS(SYSDATE,-12)
                           THEN     '12 mos. back'
                           WHEN ord_min_start     >     ADD_MONTHS(SYSDATE,-24)
                           THEN     '24 mos. back'
                           WHEN ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
                           THEN     '36 mos. back'
                           ELSE '37 mos. back +'
                   END                         AS time_period
              FROM     a          -- in real query, a is an in-line view
         ) a2          -- End in-line view a2, to compute time_period
    WHERE     o.ord_nbr     = s.ord_nbr
    AND     o.sub_ord_nbr     = s.sub_ord_nbr
    AND     o.ord_nbr     = a2.ord_nbr
    AND     o.sub_ord_nbr     = a2.sub_ord_nbr
    AND     o.ord_type     = 'AA'
    AND     o.ord_stat     IN ('CL','OP')
    AND     s.oper_stat     IN ('CL','CP')
    GROUP BY     o.part_nbr
    ,          s.major_seq_nbr
    ,          s.wctr
    ,          a2.time_period
    ORDER BY     o.part_nbr
    ,          a2.time_period
    ,          s.major_seq_nbr
    ;In your example, wctr is the same as wctr_id except for two values. If it was more complicated (e.g., if there were not just 2 values that need to be mapped to 'Z211', but also 3 values to were equivalent to 'Z987', and 1 that was to be treated like 'A012', and 5 that should appear as 'A666', and ...), then you could code all that in a humongeous CASE expression (a nested CASE expression, if it involves more that 128 branches), but it really belongs in a table, where you have the raw wctr_id (like 'H211') in one column, and its corresponding equivalent (such as 'Z211') in another. I know you said you can't create new tables; I'm just pointing this out so you can tell the people who won't let you create new tables that it's a bad idea, likely to cause errors and certain to waste time in the future.

  • Best way to store 36 values

    Hello,
    I need to store 6 types of values with combination of 6X8 values totally 288 value .
    For Example
    1[{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6}]
    2[{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6}]
    3[{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6}]
    4[{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6}]
    5[{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6}]
    6[{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6},{1,2,2,59,7,8,9,6}]
    How can i store these values in c# ?,which is the best way with respect to performance and security.
    And whether i can store these data's in separate class file and access at time of process which is a multi-threading process.
    If i asked any thing wrong sorry as i am new in these things.
    Thanks

    Try this
    List<List<List<int>>> input = new List<List<List<int>>>(){
    new List<List<int>>(){
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6}},
    new List<List<int>>(){
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6}},
    new List<List<int>>(){
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6}},
    new List<List<int>>(){
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6}},
    new List<List<int>>(){
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6}},
    new List<List<int>>(){
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},
    new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6},new List<int>(){1,2,2,59,7,8,9,6}}
    jdweng

  • Best way to load configuration

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    Hi Geoff
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    <xs:attribute name="B" type="xs:string" />
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    select xmlquery('declare default element namespace "http://OracleTest"; /MyElement/SecondChild[string(@B)="true"]' passing object_value returning content).getclobval() from "MyElement";
    Thank you
    Mirko

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    Wuhtzu

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    To you answer: The error code should be negative, shouldn't it? Even though an indicator wired to error-out of a build in labview function will actually display error codes as positive... maybe it's diffrent form labview version to labview version. My v2010 manual reads:
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    So say I want to throw an error with error code 5687 - should I then wire -5687 or +5687 to the cluster?
    Thanks - Wuhtzu

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