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• How to update primary key

  - by slave016

  Here is my problem: I have 2 tables: 1.WORKER, with coloumns |ID|OTHER_STAF| , where ID is primary key, and 2.FIRM, with coloumns |FPK|ID|SOMETHING_ELSE| , where combination FPK and ID make primary key, and also ID is a foreign key referenced to WORKER.ID (not null, and must have same value as in WORKER). I want to make stored procedure UPDATE_ID_WORKER, where I would like to change the value of specific ID in WORKER, and also in all instances of specific value of ID in FIRM. stored procedure: ........ @id .. ???? ........ Thanks for every advice...

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• Object Reference Error filling a datarow

  - by JPJedi

  This is the code: Dim dr() As DataRow = DataSet.Tables("TableName").Select("EVENTNAME = '" & name & "'") I get an "Object reference not set to an instance of an object." Error when this line is executed. It is looping through a list of selected items in a listbox. I think it has to do with how I have the datarow declared because I can look at the name and I see it ok and I also do a null check on the name before I use it. Visual Studio 2008, VB.NET. Any ideas? Yep it was a wrong table name. I guess after looking at the code for 8 hours that minor detail I just wasn't thinking to check. Thanks!

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• itext - pdf to html

  - by Cristian Boariu

  Hi guys, I have spent about 20 hours of coding to produce invoices using iText in c#. Now, i want to use the same code to transform some of the tables to html. Do you know if i can do this? For instance i have this: PdfPTable table = new PdfPTable(3); table.DefaultCell.Border = 0; table.DefaultCell.Padding = 3; table.WidthPercentage = 100; int[] widths = { 100, 200, 100}; table.SetWidths(widths); List listOfCompanyData = (List)getCompanyData(); List listOfCumparatorDreaptaData = (List)getCumparatorDreaptaData(proformaInvoice.getCumparatorDreapta()); table.AddCell((Phrase)listOfCompanyData.Items[0]); table.AddCell(""); table.AddCell((Phrase)listOfCumparatorDreaptaData.Items[0]); and i want to transform this table into html... Is it possible?

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• EJB3 with Spring

  - by fish

  I have understood that if I use EJB in Spring context, I get all the same benefits as if I was using it in "pure" EJB3 environment, is this true? I have googled but can't find a definitive, clear answer. For example, let's say I have a session bean that updates some tables in the database and it throws a System Exception. In "pure" EJB3 environment the transaction is rolled back. What if I for example @Autowire this bean using Spring, does Spring take care of the transaction handling same way as does the EJB3 container? Or what? Does it maybe require some specific configuration or is it fully "automatic"?

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• Annotate and Aggregate function in django

  - by thesteve

  In django I have the following tables and am trying to count the number of votes by item. class Votes(models.Model): user = models.ForeignKey(User) item = models.ForeignKey(Item) class Item(models.Model): name = models.CharField() description = models.TextField() I have the following queryset queryset = Votes.objects.values('item__name').annotate(Count('item')) that returns a list with item name and view count but not the item object. How can I set it up so that the object is returned instead of just the string value? I have been messing around with Manager and Queryset methods, that the right track? Any advice would be appreciated.

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• Shortest-path algorithms which use a space-time tradeoff?

  - by Chris Mounce

  I need to find shortest paths in an unweighted, undirected graph. There are algorithms which can find a shortest path between two nodes, but this can take time. There are also algorithms for computing shortest paths for all pairs of nodes in the graph, but storing such a lookup table would take lots of disk space. What I'm wondering: Is there an algorithm which offers a space-time tradeoff that's somewhere between these two extremes? In other words, is there a way to speed up a shortest-path search, while using less disk space than would be occupied by an all-pairs shortest-path table? I know there are ways to efficiently store lookup tables for this problem, and I already have a couple of ideas for speeding up shortest-path searches using precomputed data. But I don't want to reinvent the wheel if there's already some established algorithm that solves this problem.

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• T-SQL: Opposite to string concatenation - how to split string into multiple records

  - by kristof

  I have seen a couple of questions related to string concatenation in SQL. I wonder how would you approach the opposite problem: splitting coma delimited string into rows of data: Lets say I have tables: userTypedTags(userID,commaSeparatedTags) 'one entry per user tags(tagID,name) And want to insert data into table userTag(userID,tagID) 'multiple entries per user Inspired by Which tags are not in the database? question EDIT Thanks for the answers, actually more then one deserves to be accepted but I can only pick one, and the solution presented by Cade Roux with recursions seems pretty clean to me. It works on SQL Server 2005 and above. For earlier version of SQL Server the solution provided by miies can be used. For working with text data type wcm answer will be helpful. Thanks again.

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• Overriding SQLMembershipProvider

  - by vikp

  Is there built in methods into .net framework to do the following: Get role GUID from user name/user GUID Get role name from role GUID So far I have been sending queries to the asp_roles and asp_users tables to obtain that information and I'm wondering if there is a nicer way of doing this? I have the following methods that I store in the ASPUtilities class: getRoleGUID(guid userGuid) { LINQ joins } getRoleGuid(string userName) { LINQ joins } getRoleName(guid roleGuid) { LINQ joins } EDIT: I have just looked into extending SQLMembershipProvider examples. Few examples completely override the SQLMembershipProvider, but I think what I'm interested is just adding few extra methods to deal with the roles by using LINQ. Is this feasible?

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• What can cause legit MySql INSERT INTO command to fail?

  - by Makis

  I can't figure out what's causing my INSERT INTO's to fail to certain table in MySql. I can manage them to other tables. The table looks like: CREATE TABLE IF NOT EXISTS `Match` ( `id` int(11) NOT NULL AUTO_INCREMENT, `match_no` int(11) NOT NULL, `season` int(11) NOT NULL, `hometeam` int(11) NOT NULL, `awayteam` int(11) NOT NULL, PRIMARY KEY (`id`), KEY `match_no` (`match_no`), KEY `season` (`season`), KEY `hometeam` (`hometeam`), KEY `awayteam` (`awayteam`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ; And the command is INSERT INTO Match (`match_no`, `season`, `hometeam`, `awaytem`) VALUES (1, 1, 2, 3) All I get is: 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Match (match_no, season, hometeam, awaytem) VALUES (1, 1, 2, 3)' at line 1 I have checked the manual and half-a-dozen examples from the web and whatnought and tried all sorts of changes to the syntax in case there is some MySql specific oddity, but nothing seems to work.

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• What are the "Navigation Properties" in this data model for?

  - by d03boy

  I've been wondering how to properly set up many-to-many relationships in ASP.NET MVC 2 using Linq2Sql for quite some time now. I found this blog post that seems to have a similar model layout as mine. If you take a look at the first screenshot showing the data model you can see that each model has "Navigation Properties" at the bottom of it. What exactly is this and why don't my models have them? I have the proper foreign keys put in to place. Most specifically, I am looking at the relationship between the Article and Category models since that is the only many-to-many relationship that I see and that's what I'm trying to model. Obviously I use an intermediary joining table between these two tables but I am having trouble understanding the proper methodology for modeling that relationship and I'm not finding this information anywhere on The Google.

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• Finding the FORM that an element belongs to in JavaScript

  - by Magnus Smith

  How can I find out which FORM an HTML element is contained within, using a simple/small bit of JavaScript? In the example below, if I have already got hold of the SPAN called 'message', how can I easily get to the FORM element? <form name="whatever"> <div> <span id="message"></span> </div> </form> The SPAN might be nested within other tables or DIVs, but it seems too long-winded to iterate around .parentElement and work my way up the tree. Is there a simpler and shorter way? If it wasn't a SPAN, but an INPUT element, would that be easier? Do they have a property which points back to the containing FORM? Google says no...

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• SQL Server 2008 Management Studio doesn't recognize new Schema

  - by Lieven Cardoen

  I have created a new Schema in a database called Contexts. Now when I want to write a query, Management Studio doesn't recognize the tables that belong to the new Schema. It says: 'Invalid object name Contexts.ContextLibraries'... Transact-SQL: INSERT INTO [Contexts].[ContextLibraries] (ChannelId, [IsSystem]) VALUES (@ChannelId, 1) When I try the same thing on my local database, it does work... Any ideas? I did try to change the Default schema for the user from dbo to Contexts but this doesn't work. Also checked Contexts in Schemas owned by this user without success. Update: Apparently the sql query does work but the editor gives a fault saying the object is invalid.

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• DAO, Spring and Hibernate

  - by EugeneP

  Correct me if anything is wrong. Now when we use Spring DAO for ORM templates, when we use @Transactional attribute, we do not have control over the transaction and/or session when the method is called externally, not within the method. Lazy loading saves resources - less queries to the db, less memory to keep all the collections fetched in the app memory. So, if lazy=false, then everything is fetched, all associated collections, that is not effectively, if there are 10,000 records in a linked set. Now, I have a method in a DAO class that is supposed to return me a User object. It has collections that represent linked tables of the database. I need to get a object by id and then query its collections. Hibernate "failed to lazily initialize a collection" exception occurs when I try to access the linked collection that this DAO method returns. Explain please, what is a workaround here?

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• archiving table records to another table by trigger(move daialy table records to weekly table, evry

  - by sirvan

  I have written this trigger in mysql 5: create trigger changeToWeeklly after insert on tbl_daily for each row begin insert into tbl_weeklly SELECT * FROM vehicleslocation v where v.recivedate < curdate(); delete FROM tbl_daily where recivedate < curdate(); end; i want to archive records by date, move yesterday inserted record from dailly to weekly table and last weekly table to mounthly table and deletes this records from previous table this trigger has following error when insert in daily tabled occurred : "Can't update table 'tbl_daily' in stored function/trigger because it is already used by statement which invoked this stored function/trigger." please help me to solve th problem of archive old data in related tables: move yesterday inserted records to weekly table, if there is a reliable solution tell me please.

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• NHibernate: Mapping collections of value types

  - by Anry

  I have a table Order, Transaction, Payment. Class Order has the properties: public virtual Guid Id { get; set; } public virtual DateTime Created { get; set; } ... I added properties: public virtual IList<Transaction> Transactions { get; set; } public virtual IList<Payment> Payments { get; set; } These properties contain a record of tables [Transaction] and [Payment]. How to keep these lists in the database?

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• JPA Cascading Delete: Setting child FK to NULL on a NOT NULL column

  - by JBristow

  I have two tables: t_promo_program and t_promo_program_param. They are represented by the following JPA entities: @Entity @Table(name = "t_promo_program") public class PromoProgram { @Id @Column(name = "promo_program_id") private Long id; @OneToMany(cascade = {CascadeType.REMOVE}) @JoinColumn(name = "promo_program_id") private List<PromoProgramParam> params; } @Entity @Table(name = "t_promo_program_param") public class PromoProgramParam { @Id @Column(name = "promo_program_param_id") private Long id; //@NotNull // This is a Hibernate annotation so that my test db gets created with the NOT NULL attribute, I'm not married to this annotation. @ManyToOne @JoinColumn(name = "PROMO_PROGRAM_ID", referencedColumnName = "promo_program_id") private PromoProgram promoProgram; } When I delete a PromoProgram, Hibernate hits my database with: update T_PROMO_PROGRAM_PARAM set promo_program_id=null where promo_program_id=? delete from t_promo_program where promo_program_id=? and last_change=? I'm at a loss for where to start looking for the source of the problem.

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• Move million records from MEMORY table to MYISAM table.

  - by Prashant

  Hi, I am looking for a fast way to move records from a MEMORY table to MYISAM table. MEMORY table has around 0.5 million records. Both tables have exactly the same structure (same number of columns, data types etc.). But the MYISAM table is indexed (B-TREE) on a few columns. There are around 25 columns most of which are unsigned integers. I have already tried using "INSERT INTO SELECT * FROM " query. But is there any faster way to do this? Appreciate your help. Prashant

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• How can I best geocode a table of addresses in SQL Server?

  - by ess

  I've got a SQL Server 2008 table with addresses. I've got some C# code that can individually geocode the addresses. I've got a Google Maps API for geocoding. Now I'm trying to figure out the most efficient way to use these resources. I could write a console app that manually updates the tables using my C# library, but the data I have is updated periodically. I will be performing an import routine of some sort and I'm thinking it would be 'simplest' to perform the geocoding as the import occurs. I'm not so strong on SQL Server capabilities, so I'm looking for advice. I've considered letting the import call an assembly I create that would be referenced in SQL Server, but read that Sql Server 2008 has made it virtually impossible to reference your own DLL. So my next guess is having the import call a web service to pass in the address and update the table with the results, but I've not had much luck in finding info on this method. Any advice?

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• EF4 CTP5 - Map foreign key without object references?

  - by anon

  I feel like this should have a simple answer, but I can't find it. I have 2 POCOs: public class Category { public int Id { get; set; } public string Name { get; set; } } public class Product { public int Id { get; set; } public int CategoryId { get; set; } } Notice that there are no object references on either POCO. With Code-First, how do I make EF4 CTP5 define a relationship between the two database tables? (I know this is an unusual scenario, but I am exploring what's possible and what's not with Code-First)

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• Problems with contenttypes when loading a fixture in Django

  - by gerdemb

  I am having trouble loading Django fixtures into my MySQL database because of contenttypes conflicts. First I tried dumping the data from only my app like this: ./manage.py dumpdata escola > fixture.json but I kept getting missing foreign key problems, because my app "escola" uses tables from other applications. I kept adding additional apps until I got to this: ./manage.py dumpdata contenttypes auth escola > fixture.json Now the problem is the following constraint violation when I try to load the data as a test fixture: IntegrityError: (1062, "Duplicate entry 'escola-t23aluno' for key 2") It seems the problem is that Django is trying to dynamically recreate contenttypes with different primary key values that conflict with the primary key values from the fixture. This appears to be the same as bug documented here: http://code.djangoproject.com/ticket/7052 The problem is that the recommended workaround is to dump the contenttypes app which I'm already doing!? What gives? If it makes any difference I do have some custom model permissions as documented here: http://docs.djangoproject.com/en/dev/ref/models/options/#permissions

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• ALTER TABLE on dependant column

  - by Sharmi

  I am trying to alter column datatype of a primary key to tinyint from int.This column is a foreign key in other tables.So,I get the following error: Msg 5074, Level 16, State 1, Line 1 The object 'PK_User_tbl' is dependent on column 'appId'. Msg 5074, Level 16, State 1, Line 1 The object 'FK_Details_tbl_User_tbl' is dependent on column 'appId'. Msg 5074, Level 16, State 1, Line 1 The object 'FK_Log_tbl_User_tbl' is dependent on column 'appId'. Msg 4922, Level 16, State 9, Line 1 ALTER TABLE ALTER COLUMN appId failed because one or more objects access this column. Howw should i rectify this?

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• Unable to allocate new pages in table space "XXXX" ... but it's 250 megs and I'm only running DDL

  - by Sylvia

  Hello, I'm a DB2 newbie, so I'd appreciate even any pointers on where to start looking. We have great DB2 admins but they're swamped with other issues now, so I'm trying to do some troubleshooting on a development database. My situation is that I have a tablespace that's giving me this error message Unable to allocate new pages in table space "[MyTableSpace]". However, all I'm doing is running multiple (hundreds) of DDL statements, mainly creating tables but also indexes and pk scripts. So, considering that the tablespace has about 250 mg, I shouldn't be running out of space, right? Here's another thing - it appears that after I leave my script for a while, something "resets" and works for a while, then I begin to have the tablespace issue again. thanks, Sylvia

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• MYSQL Select and group by date

  - by Gil

  I'm not sure how create a right query to get the result I'm looking for. What I have is 2 tables. first has ID, Name columns and second has date and adminID, which is referenced from table 1 column ID. Now, what I want to get is basically number of times each admin loged in per day during the month. From structure like this one I want to get per day and month data so result would be similar to 1, 2, 2 march total 5 for admin 4. ID | Date ------------------ 4 | 2010/03/01 4 | 2010/03/04 4 | 2010/03/04 4 | 2010/03/05 4 | 2010/03/05

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• large amount of data in many text files - how to process?

  - by Stephen

  Hi, I have large amounts of data (a few terabytes) and accumulating... They are contained in many tab-delimited flat text files (each about 30MB). Most of the task involves reading the data and aggregating (summing/averaging + additional transformations) over observations/rows based on a series of predicate statements, and then saving the output as text, HDF5, or SQLite files, etc. I normally use R for such tasks but I fear this may be a bit large. Some candidate solutions are to 1) write the whole thing in C (or Fortran) 2) import the files (tables) into a relational database directly and then pull off chunks in R or Python (some of the transformations are not amenable for pure SQL solutions) 3) write the whole thing in Python Would (3) be a bad idea? I know you can wrap C routines in Python but in this case since there isn't anything computationally prohibitive (e.g., optimization routines that require many iterative calculations), I think I/O may be as much of a bottleneck as the computation itself. Do you have any recommendations on further considerations or suggestions? Thanks

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• rails: include statement with two ON conditions

  - by Markus

  Hi, I have tree tables books bookmarks users where there is a n to m relation from books to users trough bookmarks. Im looking for a query, where I get all the books of a certain user including the bookmarks. If no bookmarks are there, there should be a null included... my sql statement looks like: SELECT * FROM `books` LEFT OUTER JOIN `bookmarks ` ON bookmarks.book_id = books.id AND bookmarks.user_id = ? In rails I only know the :include statement, but how can I add the second bookmarks.user_id = ? statement in the ON section of this query? if I put it in the :conditions part, no null results would get returned! Thanks! Markus

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