BLOB field in report causes suppresion of one record

I am using Crystal Reports 10 connecting to a view in an Oracle 10g database using an Oracle driver connection.
We have a report that has been in use for sometime that displays the image in a BLOB field in the Report Footer. A parameter based on a unique ID field allows us to select all data that matches that ID number. The data is displayed as rows in the Details section. There is one BLOB field for each unique ID. We recently noted that the 2nd record in all the datasets fail to display in the report. Regardless of the sort order used, it is always the 2nd record. The view returns the proper amount of records, and the report's SQL query, when copied and pasted into a SQL editor, also returns the proper amount of records. However, the 2nd record fails to display. If the BOB field is removed from the report, the 2nd record appears. This behaivor can be reproduced at will. There are no suppression formulas in the report.
Anybody have any ideas at what may be causing this to occur?

Please re-post if this is still an issue to the Data Connectivity - Crystal Reports Forum or purchase a case and have a dedicated support engineer work with you directly

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END;    Thanks if you kept on reading so far, I would really appreciate any feedback!
Regards, Sascha

Welcome to the forum!
Whenever you post provide your 4 digit Oracle version (result of SELECT * FROM V$VERSION).
Thanks for providing an easy-to-understand problem statement and for using code tags.
>
the code of to-be-updated Oracle packages is stored inside of a BLOB field
>
This should be stored in a CLOB since it is character data. Why are you using BLOB?
>
the BLOB field will contain both the package specification and package body and needs to be split into two parts to first execute the spec and then to execute the package body
>
Good, clear problem statement. So why doesn't your code do just what you said it should do: 1) split the code into two parts, 2) execute the spec and 3) execute the body.
Instead of writing code that does these three relatively simple steps your code tries to combine splitting and executing and mushes/mashes it all together. The result, as you found, is code that is hard to understand, hard to debug, doesn't work and doesn't report on what it is doing.
Code like this doesn't have a performance issue so the code should implement the simple step-by-step process that you so elegantly stated in your problem description:
1. split the code into two parts
2. execute the spec
3. execute the body
My advice is to refactor your code to perform the above steps in the proper order and to add proper exception handling and reporting for each step. Then when a step isn't working you will know exactly where and what the problem is.
Here are my recommendations.
1. Add two CLOB variables - one will hold the spec, the second will hold the body
2. Add a comment (you have some good ones in the code now) for every step no matter how trivial it may be
3. Add exception/error handling to EVERY STEP
Your code for the first step has a comment but no exception handling. What should happen if you don't get any data? Why aren't you validating the data you get? Dynamic SQL using table-driven data is great, I love it, but you MUST validate that the data you get is what you expect to get.
    -- retrieve update ID
    SELECT log_update_ref INTO currentUpdate FROM link_update_with_taskstep WHERE log_taskstep_ref = stepRef;Recommended
    -- step 1 - retrieve update ID - This is the id that determines BLAH, BLAH, BLAH - add appropriate to tell a new developer what this ID is and what it means.
    BEGIN
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    EXCEPTION
        WHEN ??? THEN -- what should happen if step 1 fails? Do it here - don't default to an exception handler that is several pages away.
    END;Your code
     begin
        select storedobject, change_area
        into storedCode, schemaReference
        from vw_storedobjects
        where step_id = stepRef;
     exception
      when no_data_found then
        pIsError := 1;
        pErrorMsg := 'Invalid SQL ID ' || stepRef;
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Good - except there is no comment that says what this does - I assume that the query above and this block are the 'retrieve update ID ' step?
You log an error message and set the error flag to '1'. But since you don't want to continue why aren't you exiting the procedure and returning right here?
      if pIsError = 0 then
        beginSo now you check the error flag and do several pages of code if there were no errors.
I don't like that 'inverted' logic.
If you don't want to continue then STOP right now! Don't make a developer scan through pages and pages of code to find out you really aren't doing anything else if there was an error.
Either put a RETURN statement in the exception handler above or change your code to
      if pIsError = 1 then
        RETURN;
      end if;Now the rest of the code doesn' t have to be indented; you will never get there if there is an error. Check for errors after every step and exit right then as appropriate.
          -- change schema
          execute immediate 'alter session set current_schema = ' || schemaReference;
          objectCursor := dbms_sql.open_cursor;
          loop
            strLine := UTL_RAW.CAST_TO_VARCHAR2(dbms_lob.substr(storedCode, 32767, pos));
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            loopThis code mixes all of the steps together into one giant mess. You open a cursor, try to split the BLOB into spec and body and try to parse and execute both all within a double nested loop.
Even if that works correctly another developer will have a hard time understanding what the code is doing and fixing it if it goes wrong. And it will go wrong if you let me test if for you because I will put garbage into the BLOB for the spec, body or both to make sure it breaks and to see how your code handles it.
I suggest you rewrite this double nested loop to perform the three steps separately.
1. split the code into two parts
a. put the spec into one new CLOB variable and the body into the other.
b. use DBMS_OUTPUT (or a work table) to output the spec and body so you can see what the code is and make sure the 'split' process worked properly. You probably created that BLOB by manually concatenating the SPEC and BODY to begin with so now create a SPLIT process to split them again and give them back to you. This is such a fundamental component that I suggest creating a new SPLIT_MY_BLOB procedure. This procedure would take a BLOB and return two CLOBS as OUT parameters: one CLOB is the spec and one is the body. Then you can reuse this 'split' procedure in other code or more complex versions of code. Modular programming is the key.
2. execute the spec - Now have a step that executes the spec and does something appropriate if the step succeeds or if it fails. I mean, do you really want to do execute the body if the spec execution fails? What do you want to do? Should you delete the body and spec? If you don't you might wind up with an INVALID body based on old code and an INVALID spec based on the new code you were trying to use. How will anyone, including you, know that the spec and body in the ALL_SOURCE view is really two different versions of things?
This suggests that for your use case you may want to consider DROPPING the entire package, spec and body, before trying to recreate them both. At least if the package is totally missing anyone will know that the entire thing needs to be put back. Ahhhh - but to do that you need to know the package name so you can drop it. Than may require adding another step to get the package name from your data-driven table and adding a DROP PACKAGE step.
3. execute the body - This step executes the body. Hmmmm - we have two nearly identical steps. So why don't you create a new function/procedure that takes a CLOB as input, uses dynamic sql to execute it and returns a result code. That would be useful. Then you could execute ANY sql stored in a CLOB and have a generic function that you can use for other things.
Right now you are using the VARCHAR2 table version of DBMS_SQL.PARSE but you would change this to use the CLOB version.
The end result of this refactoring is a main function/procedure that acts as the CONTROL - it decides what to do and what data (BLOB) to do it with. But it doesn't actually do ANY of the work. It just controls what is done.
And you have a couple of generic, reuseable functions that actually do the work. One knows how to split a CLOB into spec and body. The other knows how to use dynamic SQL to execute a CLOB.
Now you have a modular architecture that is easy to understand, easy to code and easy to test.

Poor quality in images from blob field

Post Author: pbrand
CA Forum: .NET
I am using Visual Studio 2005 SP1 along with Crystal Reports XI R2SP1. I have created a dataset for my report which has several BLOB fields that contain images. One of the images is of a National Instruments graph control. All images appear to be of lower quality than the original images when I print the report. For instance the graph shows quite a bit of compression artifacts around the plots and text. I have tried turning on the "Retain Original Image Color Depth" setting which had no effect on the quality of the printout that I could see. It appears that Crystal Reports is compressing the images. Is there a better way of printing images in a Crystal Report? Basically what I am doing now is taking the images, converting them to byte arrays and loading them into the dataset's BLOB fields. Then printing the report. I have thought about using the chart control in Crystal Reports but it does not have all the functionality that I require. Is there some way to copy the NI graph control directly to the report? I can live with lower quality on the other images, but I need the graph to be as sharp as possible.If I can't find a solution to this I will have to drop Crystal Reports and find something else.

Post Author: pbrand
CA Forum: .NET
I am using Visual Studio 2005 SP1 along with Crystal Reports XI R2SP1. I have created a dataset for my report which has several BLOB fields that contain images. One of the images is of a National Instruments graph control. All images appear to be of lower quality than the original images when I print the report. For instance the graph shows quite a bit of compression artifacts around the plots and text. I have tried turning on the "Retain Original Image Color Depth" setting which had no effect on the quality of the printout that I could see. It appears that Crystal Reports is compressing the images. Is there a better way of printing images in a Crystal Report? Basically what I am doing now is taking the images, converting them to byte arrays and loading them into the dataset's BLOB fields. Then printing the report. I have thought about using the chart control in Crystal Reports but it does not have all the functionality that I require. Is there some way to copy the NI graph control directly to the report? I can live with lower quality on the other images, but I need the graph to be as sharp as possible.If I can't find a solution to this I will have to drop Crystal Reports and find something else.

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So, when I try to insert one of these problem .gifs in SqlDeveloper, I open the new mdd_figure table, select the blob field, open the edit dialog, set it to figure, select the .gif that I want to load and then save it. The blob field changes from NULL to BLOB, but it is empty. When I try to commit, I get the following error from SqlDev.
UPDATE "MDD"."MDD_FIGURE" SET WHERE ROWID = 'AAAOeWAAEAAABAlAAz' AND ORA_ROWSCN = '358136842'
One error saving changes to table "MDD"."MDD_FIGURE":
Row 14: ORA-01410: invalid ROWID
I use rollback to restore the record to it's previous state.
If I load one of the successfully loaded .gifs into the same field, it loads perfectly as follows.
UPDATE "MDD"."MDD_FIGURE" SET WHERE ROWID = 'AAAOeWAAEAAABAoAAp' AND ORA_ROWSCN = '358136522'
Commit Successful
It appears the 28 gifs have a problem. I've re-scanned them, with the same results. They are just small scanned line map images from our earlier publications. They view properly in several different graphics programs and I can't find anything wrong with them.
I notice that the ROWID's are different while the ORA_ROWSCN's are the same - but what is the significance of that?
Any suggestions as to what is happening and what I can do about it?
Thanks for any help you can give me.
glenn
(Database is 10R2 and sqldev is the most recent one)
Edited by: gconley on Sep 25, 2008 9:51 PM

solved it myself - problem was with the gif

BLOB field in report causes suppresion of one record

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