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• How can I add dynamic field in the model in django ?

  - by Wu Jie

  Hello, I'm using django to create a application download site. I try to write a model, that the admin can add the different download content dynamically in the admin page. For example I have a software named foobar, it have 3 different version: 1.1, 1.2, 1.3. I would like the user can admin the model by using an add button to add the download link with a download version. But I don't know how to do this in django.

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• Elegantly handling constraint violations in EJB/JPA environment?

  - by hallidave

  I'm working with EJB and JPA on a Glassfish v3 app server. I have an Entity class where I'm forcing one of the fields to be unique with a @Column annotation. @Entity public class MyEntity implements Serializable { private String uniqueName; public MyEntity() { } @Column(unique = true, nullable = false) public String getUniqueName() { return uniqueName; } public void setUniqueName(String uniqueName) { this.uniqueName = uniqueName; } } When I try to persist an object with this field set to a non-unique value I get an exception (as expected) when the transaction managed by the EJB container commits. I have two problems I'd like to solve: 1) The exception I get is the unhelpful "javax.ejb.EJBException: Transaction aborted". If I recursively call getCause() enough times, I eventually reach the more useful "java.sql.SQLIntegrityConstraintViolationException", but this exception is part of the EclipseLink implementation and I'm not really comfortable relying on it's existence. Is there a better way to get detailed error information with JPA? 2) The EJB container insists on logging this error even though I catch it and handle it. Is there a better way to handle this error which will stop Glassfish from cluttering up my logs with useless exception information? Thanks.

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• What is postgresql_psycopg2 ?

  - by xRobot

  What is postgresql_psycopg2 ? Difference from postgresql ?

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• Strategy for Offline/Online data synchronization

  - by Adi

  My requirement is I have server J2EE web application and client J2EE web application. Sometimes client can go offline. When client comes online he should be able to synchronize changes to and fro. Also I should be able to control which rows/tables need to be synchronized based on some filters/rules. Is there any existing Java frameworks for doing it? If I need to implement on my own, what are the different strategies that you can suggest? One solution in my mind is maintaining sql logs and executing same statements at other side during synchronization. Do you see any problems with this strategy?

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• How to convert EER to SQL Table?

  - by Khajavi

  I have no problem with converting ER to SQL tables, but I don't know how can I convert EER to SQL tables? as you Know that EER has "is a" specification and inheritance, but I don't know how relational databases can connect with inheritance specification

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• Require help in Writing Query

  - by harigm

  The following image have been uploaded to show what I am trying to do and what I wanted out of it Can any one help me write the Query to get the results what I want Please check the following SELECT * FROM KPT WHERE PROPERTY_ID IN (SELECT PROPERTY_ID FROM khata_header WHERE DIV_ID = 3 and RECORD_STATUS = 0) and CHALLAN_NO > 42646 The above is the query I have written and I have got the following result set ID CHALLAN_NO PROPERTY_ID SITE_NO TOTAL_AMOUNT ----- ------------- -------------- ------------------- --------------- 1242 42757 3103010141 296 595 1243 63743 3204190257 483 594 1244 63743 3204190257 483 594 1334 43395 3217010223 1088 576 1421 524210 3320050416 (null) (null) 1422 524210 3320050416 (null) (null) 1560 564355 3320021408 (null) (null) 1870 516292 3320040420 (null) (null) 1940 68357 3217100104 139 1153 1941 68357 3217100104 139 1153 2002 56256 3320100733 511 4430 2003 56256 3320100733 511 4430 2004 66488 3217040869 293 3094 2005 66488 3217040869 293 3094 2016 64571 3217040374 (null) (null) 2036 523122 3320020352 (null) (null) 2039 65682 3217040021 273 919 In my resultset, I am getting the PropertyId repeated, since there are multilple entries, How Can I know How many have been repeated What are those Property Id which have repeated more than 2 times. Little Back ground about the tables are PROPERTY_ID is the FK in the KPT PROPERTY_ID is the PK in KH I am writing a subquery to get the Result, so I am stuck I dont know how to get my results Please help

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• Combining data sets without losing observations in SAS

  - by John

  Hye guys, I know, another post another problem :D :(. I took a screenshot to easily explain my problem. http://i39.tinypic.com/rhms0h.jpg As you can see I want to merge two tables (again), the Base & Analyst table. What I want to achieve is displayed in the right bottom corner table. I’m calculating the number of total analysts and female analysts for each month in the analyst table. In the base table I have different observations for one company (here company Alcoa with ticker AA). When I use the following command: data want; merge base analyst; by month ; run; I get the right up corner problem. My observations in the main table are being narrowed down to only 4 observations (for each different year one observation, 2001, 2002, 2005, 2006). What I want is that the observations are not reduced but that for every year the same data is being placed as shown in the right bottom corner. What am I missing in my merge command? In both tables I have month as a time count variable ( the observations in my base table are monthly) on which I need to merge. For clarity I added 2 screenshots of my real databases in SAS. The base table: http://i42.tinypic.com/dr5jky.jpg The analyst table: http://i40.tinypic.com/eqpmqq.jpg Here is what my merged table looks like: http://i43.tinypic.com/116i62s.jpg You can clearly see that the merged table only has four observations left for AA (one for each unique year) instead of the original 8. Anyone an idea to solve this?

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• Why is MySQL with InnoDB doing a table scan when key exists and choosing to examine 70 times more ro

  - by andysk

  Hello, I'm troubleshooting a query performance problem. Here's an expected query plan from explain: mysql> explain select * from table1 where tdcol between '2010-04-13:00:00' and '2010-04-14 03:16'; +----+-------------+--------------------+-------+---------------+--------------+---------+------+---------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+--------------------+-------+---------------+--------------+---------+------+---------+-------------+ | 1 | SIMPLE | table1 | range | tdcol | tdcol | 8 | NULL | 5437848 | Using where | +----+-------------+--------------------+-------+---------------+--------------+---------+------+---------+-------------+ 1 row in set (0.00 sec) That makes sense, since the index named tdcol (KEY tdcol (tdcol)) is used, and about 5M rows should be selected from this query. However, if I query for just one more minute of data, we get this query plan: mysql> explain select * from table1 where tdcol between '2010-04-13 00:00' and '2010-04-14 03:17'; +----+-------------+--------------------+------+---------------+------+---------+------+-----------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+--------------------+------+---------------+------+---------+------+-----------+-------------+ | 1 | SIMPLE | table1 | ALL | tdcol | NULL | NULL | NULL | 381601300 | Using where | +----+-------------+--------------------+------+---------------+------+---------+------+-----------+-------------+ 1 row in set (0.00 sec) The optimizer believes that the scan will be better, but it's over 70x more rows to examine, so I have a hard time believing that the table scan is better. Also, the 'USE KEY tdcol' syntax does not change the query plan. Thanks in advance for any help, and I'm more than happy to provide more info/answer questions.

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• What are the benefits of left outer join vs nested aggregate selects to find the newest rows in a table?

  - by RenderIn

  I'm doing: select * from mytable y where y.year = (select max(yi.year) from mytable yi where yi.person = y.person) Is that better or worse from a performance aspect than: select y.* from mytable y left outer join mytable y2 on y.year < y2.year and y.person = y2.person where y2.year is null The explain plan/anecdotal evidence is inconclusive so I am wondering if in general one is better than the other.

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• Left Join 3 Tables and Show True or False on Empty Cells

  - by Jason Shultz

  Ok, this may be confusing so I hope I explain it correctly. I have 4 tables: business photos video category I want to display "featured" businesses on the home page (or elsewhere) and I want to show a Yes or No in the table row based upon whether or not there are photos or videos for that business. Example: Joes Crab Shack has no videos or photos but is featured. So, when his row is echoed out it will show the Business Name and Business Owner but there will be no data in the photo or video cells thus in the video and photos column it will say No. Otherwise, if the opposite was true, it would say Yes. Here's my pastebin

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• Get to know what HTML-button is clicked with PHP, no Name of value available

  - by koko

  I have a wizard with 4 steps and in one of the steps, you can add items. By default, there are 3 time 5 empty input-fields listed. When you click a button, there have to be added some more. The 3 times 5 fields are added by a loop. How can I determine where I have to add some fields (in the first 5 field of the second or the third). I can't use another name for every button, because sometimes there can be more then 3 groups of 5 fields. In my code (PHP), I use the name of the button to know what happened in the form, so the name can't be different for the button in every group ... Further, the whole step is 1 form, so the post can't go to another script ... The value of the button has to be the same for every group. I've been thinking on possible solutions and these came up: On click a javascript adds a value to the post (in a hidden field?) But is this posted with the form? Could it be possible to get the ID of the clicked button? This might be different :-) I need a refresh after the click, so pure javascript isn't a solution either ... It is a very specific question, but I hope someone can give me some direction. Here is the code I'm talking about: <h3><label class="list_list:table_title">Eten</label></h3> <table id="eten"> <thead> <tr> <th>Naam item</th> <th>Aantal</th> </tr> </thead> <tbody> <tr> <td class="item"><input type="text" name="item_1_1" value="" class="inputText" maxlength="64" size="46" tabindex="11"/></td> <td class="amount"><input type="text" name="amount_1_1" value="" class="inputText" maxlength="64" size="10" tabindex="11"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_2" value="" class="inputText" maxlength="64" size="46" tabindex="12"/></td> <td class="amount"><input type="text" name="amount_1_2" value="" class="inputText" maxlength="64" size="10" tabindex="12"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_3" value="" class="inputText" maxlength="64" size="46" tabindex="13"/></td> <td class="amount"><input type="text" name="amount_1_3" value="" class="inputText" maxlength="64" size="10" tabindex="13"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_4" value="" class="inputText" maxlength="64" size="46" tabindex="14"/></td> <td class="amount"><input type="text" name="amount_1_4" value="" class="inputText" maxlength="64" size="10" tabindex="14"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_5" value="" class="inputText" maxlength="64" size="46" tabindex="15"/></td> <td class="amount"><input type="text" name="amount_1_5" value="" class="inputText" maxlength="64" size="10" tabindex="15"/></td> </tr> </tbody> </table> <input id="list_list:add" type="submit" name="list_list:add" value="voeg extra items toe" class="add" /> <div class="spacer"></div> <h3><label class="list_list:table_title">Drinken</label></h3> <table id="drinken"> <thead> <tr> <th>Naam item</th> <th>Aantal</th> </tr> </thead> <tbody> <tr> <td class="item"><input type="text" name="item_2_1" value="" class="inputText" maxlength="64" size="46" tabindex="21"/></td> <td class="amount"><input type="text" name="amount_2_1" value="" class="inputText" maxlength="64" size="10" tabindex="21"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_2" value="" class="inputText" maxlength="64" size="46" tabindex="22"/></td> <td class="amount"><input type="text" name="amount_2_2" value="" class="inputText" maxlength="64" size="10" tabindex="22"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_3" value="" class="inputText" maxlength="64" size="46" tabindex="23"/></td> <td class="amount"><input type="text" name="amount_2_3" value="" class="inputText" maxlength="64" size="10" tabindex="23"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_4" value="" class="inputText" maxlength="64" size="46" tabindex="24"/></td> <td class="amount"><input type="text" name="amount_2_4" value="" class="inputText" maxlength="64" size="10" tabindex="24"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_5" value="" class="inputText" maxlength="64" size="46" tabindex="25"/></td> <td class="amount"><input type="text" name="amount_2_5" value="" class="inputText" maxlength="64" size="10" tabindex="25"/></td> </tr> </tbody> </table> <input id="list_list:add" type="submit" name="list_list:add" value="voeg extra items toe" class="add" /> <div class="spacer"></div> <h3><label class="list_list:table_title">Varia</label></h3> <table id="varia"> <thead> <tr> <th>Naam item</th> <th>Aantal</th> </tr> </thead> <tbody> <tr> <td class="item"><input type="text" name="item_3_1" value="" class="inputText" maxlength="64" size="46" tabindex="31"/></td> <td class="amount"><input type="text" name="amount_3_1" value="" class="inputText" maxlength="64" size="10" tabindex="31"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_2" value="" class="inputText" maxlength="64" size="46" tabindex="32"/></td> <td class="amount"><input type="text" name="amount_3_2" value="" class="inputText" maxlength="64" size="10" tabindex="32"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_3" value="" class="inputText" maxlength="64" size="46" tabindex="33"/></td> <td class="amount"><input type="text" name="amount_3_3" value="" class="inputText" maxlength="64" size="10" tabindex="33"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_4" value="" class="inputText" maxlength="64" size="46" tabindex="34"/></td> <td class="amount"><input type="text" name="amount_3_4" value="" class="inputText" maxlength="64" size="10" tabindex="34"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_5" value="" class="inputText" maxlength="64" size="46" tabindex="35"/></td> <td class="amount"><input type="text" name="amount_3_5" value="" class="inputText" maxlength="64" size="10" tabindex="35"/></td> </tr> </tbody> </table> <input id="list_list:add" type="submit" name="list_list:add" value="voeg extra items toe" class="add" /> <div class="spacer"></div> </div> <div id="formButtons"> <input id="list_info:back" type="submit" name="list_info:back" value="<< Terug" tabindex="11" class="back" /> <input id="list_info:next" type="submit" name="list_info:next" value="Volgende >>" tabindex="12" class="next" /> <input id="list_info:options" type="submit" name="list_info:options" value="Opties" tabindex="13" class="options" /> <input id="list_info:finish" type="submit" name="list_info:finish" value="Voltooien" tabindex="14" disabled="disabled" class="finish" /> </div>

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• How can I implement SQL INTERSECT and MINUS operations in MS Access

  - by Varun Mahajan

  I have researched and haven't found a way to run INTERSECT and MINUS operations in MS Access. Does any way exist

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• Filling data in FormView from different tables

  - by wacky_coder

  Hi, I am using a FormView in an online quiz page for displaying the questions and RadioButtons (for answers) http://stackoverflow.com/questions/2438219/online-quiz-using-asp-dot-net Now, I need to pick the questions according to a TestID and a particular Set of that Test. The testid and the set_number would be passed using Session variables. I'm having 3 testIDs and 3 Sets per TestID and, thus, am using 9 tables to store the Questions, the Options and the correct answer. I need help on how to set the FormView so that it extracts the questions from a particular table only. Do I need to use a StoredProcedure ? If yes, how? PS: If I use only one table to store all the questions from each Set and for each TestID, I can do that, but I'd prefer using separate tables.

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• Rails show latest entry

  - by Danny McClelland

  Hi Everyone, I have a working Rails application on version 2.3.5 - I am using many to many model relations and have got almost everything working. What I would like to do is on my new kase page show the most recent kase job ref at the top. So for example, if I created a new kase with a job ref of "001", if I then went to create a new kase it would show at the top "Your previous kases reference was 001". I have the field of jobref in the new kase form, so I am trying to workout what I need to do to output only the last jobref. If that makes sense! Thanks, Danny

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• Mapping a ER model to Rails

  - by Thiago

  Hi there, I want to map the following ER schema to rails: I have an entity called "user" which has a self relationship called "has friend", which has an attribute called "status". In code, I would like to run: User.friends and it should return me an array of users, containing the users that I'm friend of. It shouldn't matter in which side of the relationship I am (i.e. whether I'm the friender or the friendee). Any thoughts?

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• Maintaining integrity of Core Data Entities with many incoming one-to-many relationships

  - by Henry Cooke

  Hi all. I have a Core Data store which contains a number of MediaItem entities that describe, well, media items. I also have NewsItems, which have one-to-many relationships to a number of MediaItems. So far so good. However, I also have PlayerItems and GalleryItems which also have one-to-many relationships to MediaItems. So MediaItems are shared across entities. Given that many entities may have one-to-many relationships, how can I set up reciprocal relationships from a MediaItem to all (1 or more) of the entities which have relationships to it and, furthermore, how can I implement rules to delete MediaItems when the number of those reciprocal relationships drops to 0?

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• Is it possible to set attribute to NULL in XML so that it can be parsed and recognised as NULL in sq

  - by Shantanu Gupta

  How to parse attributes in sql server so that it can recognize NULL values and consider it as a NULL in sql server. I am using Sql server 2005

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• SQL Server 2005 Convert Ascii to Unicode

  - by Guazz

  I have data in an nvarchar field with data in ascii format: "Zard Frères Guesta" How do I convert it to a readable(unicode) format in t-sql?

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• Concurrent update to DBF files with Advantage Local Sever and FoxPro

  - by ChrisR

  Is it safe to update DBF files using Advantage Local Server .Net provider whilst a FoxPro application is running that may also be accessing the DBF files? i.e. does Advantage take care of row locking?

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• Oracle .dmp file

  - by Grasper

  I have an oracle .dmp file, and no access to an oracle install.. Is there any way I can read the data or open it in another program to see what data is in this file?

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• How can I round money values to the nearest $5.00 interval?

  - by Frank Developer

  I have an Informix-SQL based Pawnshop app which calculates an estimate of how much money should be loaned to a customer, based on the weight and purity of gold. The minimum the pawnshop lends is $5.00. The pawnshop employee will typically lend amounts which either ends with a 5 or 0. examples: 10, 15, 20, 100, 110, 125, etc. They do this so as to not run into shortage problems with $1.00 bills. So, if for example my system calculates the loan should be: $12.49, then round it to $10, $12.50 to $15.00, $13.00 to $15.00, $17.50 to $20.00, and so on!..The employee can always override the rounded amount if necessary. Is it possible to accomplish this within the instructions section of a perform screen or would I have to write a cfunc and call it from within perform?.. Are there any C library functions which perform interval rounding of money values?.. On another note, I think the U.S. Government should discontinue the use of pennies so that businesses can round amounts to the nearest nickel, it would save so much time and weight in our pockets!

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• problem sybase autogenerated ids

  - by daedlus

  Hi , I have a table in which the PK column Id of type bigint and it is populated automatically increasing order of 1,2,3...so on i notice that some times all of a sudden the ids that are generated are having very big value . for example the ids are like 1,2,3,4,5,500000000000001,500000000000002 there is a huge jump after 5...ids 6 , 7 were not used at all i do perform delete operations on this table but i am absolutely sure that missing ids were not used before. why does this occur and how can i fix this? many thanks for looking in to this. my env: sybase ase 15.0.3 , linux

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• What's the best way to store sort order in SQL?

  - by Duracell

  The guys at the top want sort order to be customizable in our app. So I have a table that effectively defines the data type. What is the best way to store our sort order. If I just created a new column called 'Order' or something, every time I updated the order of one row I imagine I would have to update the order of every row to ensure posterity. Is there a better way to do it?

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• Tools to work with App Engine data dumps

  - by Thilo

  Using the bulkloader.py utility you can download all data from your application's Datastore. It is not obvious how the data is stored, however. From the looks of it, you get a SQLite file with all data in binary format in a single table: sqlite> .tables bulkloader_database_signature result sqlite> .schema result CREATE TABLE result ( id BLOB primary key, value BLOB not null, sort_key BLOB); Are there any tools to work with this data?

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• IntegrityError: foreign key violation upon delete

  - by Lukasz Korzybski

  I have Order and Shipment model. Shipment has a foreign key to Order. class Order(...): ... class Shipment() order = m.ForeignKey('Order') ... Now in one of my views I want do delete order object along with all related objects. So I invoke order.delete(). I have Django 1.0.4, PostgreSQL 8.4 and I use transaction middleware, so whole request is enclosed in single transaction. The problem is that upon order.delete() I get: ... File "/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 28, in _commit return self.connection.commit() IntegrityError: update or delete on table "main_order" violates foreign key constraint "main_shipment_order_id_fkey" on table "main_shipment" DETAIL: Key (id)=(45) is still referenced from table "main_shipment". I checked in connection.queries that proper queries are executed in proper order. First shipment is deleted, after that django executes delete on order row: {'time': '0.000', 'sql': 'DELETE FROM "main_shipment" WHERE "id" IN (17)'}, {'time': '0.000', 'sql': 'DELETE FROM "main_order" WHERE "id" IN (45)'} Foreign key have ON DELETE NO ACTION (default) and is initially deferred. I don't know why I get foreign key constraint violation. I also tried to register pre_delete signal and manually delete shipment objects before delete on order is called, but it resulted in the same error. I can change ON DELETE behaviour for this key in Postgres but it would be just a hack, I wonder if anyone has a better idea what's going on here. There is also a small detail, my Order model inherits from Cart model, so it actually doesn't have id field but cart_ptr_id and after DELETE on order is executed there is also DELETE on cart, but it seems unrelated? to the shipment-order problem so I simplified it in the example.

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