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• why assert_equal() in Ruby on Rails sometimes seem to compare by Identity and sometimes by value?

  - by Jian Lin

  it was very weird that yesterday, I was do an integration test in Rails and assert_equal array_of_obj1, array_of_obj2 # obj1 from db, obj2 created in test and it failed. The values shown inside the array and objects were identical. If I change the test to assert array_of_obj1 == array_of_obj2 Then it will pass. But today, the first test actually passed. What reason could it be? Is assert_equal always using == or .equal? in Rails 2.2 or 2.3.5?

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• Make SharePoint 2007 List View read-only

  - by FireSnake

  I need to deploy a new List View for the standard List View Web Part in MOSS 2007 via the object model (the list already exists, a new view should be added). I need and want to make this list view read-only. This is because saving changes to the view would corrupt modifications made to Header/Footer. How can I do that via the object model? I looked at the content db, the read-only flag (0x20) is stored with the view and could technically be updated using calls to proc_GetAllWebPartsOnPage and proc_UpdateView[Properties]. NOTE: The database interface and all mentioned stored procs are all documented by Microsoft. Is there ANY way to do that via the object model, because I would strongly prefer that?

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• Join data from two Lists into one object

  - by Petr Mensik

  I ran into following situation and I am wondering about best solution. Let's say I have List<Object1> and List<Object2>, these lists are result of two separated queries. Both of them have the same size and there is relationship 1:1 between elements in the lists based on ID. I know that best solution would be fetching data in one DB query but that's possible right now. So my question is, what is the best way to join these lists into let's say List<Object3>?

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• How should I use try...except while defining a function?

  - by SpawnCxy

  Hi all, I find I've been confused by the problem that when I needn't to use try..except.For last few days it was used in almost every function I defined which I think maybe a bad practice.For example: class mongodb(object): def getRecords(self,tname,conditions=''): try: col = eval("self.db.%s" %tname) recs = col.find(condition) return recs except Exception,e: #here make some error log with e.message What I thought is ,exceptions may be raised everywhere and I have to use try to get them. And my question is,is it a good practice to use it everywhere when defining functions?If not are there any principles for it?Help would be appreciated! Regards

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• SQL Compact 2008 Connection String Problem

  - by Seth

  I have the following code to connect to a sql server compact edition 2008: private SqlConnection sqlConn; public void createConnection() { String connectionString = @"Data Source=C:\Projects\somefile.sdf;Persist Security Info=False"; sqlConn = new SqlConnection(connectionString); sqlConn.Open(); } However, I keep getting the following error when sqlConn.Open() is executed: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Does anyone have any ideas what the problem might be? I can create a connection to the db in the database explorer but it doesn't seem to work in code.

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• Need help in understanding a SELECT query

  - by Grant Smith

  I have a following query. It uses only one table (Customers) from Northwind database. I completely have no idea how does it work, and what its intention is. I hope there is a lot of DBAs here so I ask for explanation. particularly don't know what the OVER and PARTITION does here. WITH NumberedWomen AS ( SELECT CustomerId ,ROW_NUMBER() OVER ( PARTITION BY c.Country ORDER BY LEN(c.CompanyName) ASC ) women FROM Customers c ) SELECT * FROM NumberedWomen WHERE women > 3 If you needed the db schema, it is here

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• Refresh a GridView after some event on server

  - by Attilah

  I use a GridView to represent data from a table in my DB. the GridView has some template fields whose content are determined before displaying the Grid ( I use the RowDataBound event to determine content of template fields before displaying the GridView). The page displays a list of records from the table records and then, the recording process starts. after the process is over, the template fields should be updated. how do I automatically refresh the GridView after the process is finished ? it should be noted that the GridView is contained within an control and that I continuously poll the server using a Timer control that executes "GridView1.DataBind()" at the server level every 60 seconds. How can I solve this ?

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• Unusual conversion error (string to integer) asp.net

  - by Phil

  I have my repeater item template: <ItemTemplate> <tr><td><%#Container.DataItem("Category")%></td></tr> </ItemTemplate> Hooked up to: s = "SQL that works ok on server" x = New SqlCommand(s, c) x.Parameters.Add("@contentid", SqlDbType.Int) x.Parameters("@contentid").Value = contentid c.Open() r = x.ExecuteReader If r.HasRows Then Linksrepeater.DataSource = r Linksrepeater.DataBind() End If c.Close() r.Close() When I run the code I get: Invalid Cast Exception was not handled by user code (Conversion from string "category" to type 'Integer' is not valid.) I'm not sure how / why it is trying to convert "Category" to integer as in the db it is a string. Can you please tell me how to avoid this error? thanks.

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• FastObjects.NET(is an OODB from Versant) performence in Real Scenerios?

  - by Lalit

  FastObjects.NET Saves the whole class object(if marked with attribute Persistent) at once in file system(using serilization or similar technology). They are promissing that it is even faster then normal SQL DB approach. My team also thought it is better and faster to save the whole object once instead of each field one by one. Defination of their website: FastObjects .NET 10.0 fully conforms to the Microsoft.NET 2.0 framework. Tightly integrated with Visual Studio 2005, it offers a developer-friendly, object-oriented alternative to a relational database for .NET persistence. I want to have your experiences of using FastObjects in production scenerio? They are promising for Indexing/Transaction/clustoring/replication.

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• for TimeWithZone object, how to change the zone part only?

  - by leomayleomay

  I have a table Coupon with a field expired_at, which is of datetime type, and before I save the record, I want to change the zone part of the field according to the user's choice. Say, c = Coupon.new c.expired_at = DateTime.now c.expired_at_timezone = "Arizona" c.save! and in the coupon.rb class Coupon << ActiveRecord::Base def before_save # change the zone part here, leave the date and time part alone end end What I'm saying is if the admin want the coupon expired at 2014-07-01 10:00 am, Arizona time, the expired_at stored in the db should be like this: Tue, 01 Jul 2014 10:00:00 MST -07:00 is there any way I can modify the zone part only and leave the date and time part alone? Thanks

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• Export from a standalone database to an embedded database.

  - by jdana

  I have a two-part application, where there is a central database that is edited, and then at certain times, the data is released and distributed as its own application. I would like to use a standalone database for the central database (MySQL, Postgres, Oracle, SQL Server, etc.) and then have a reliable export to an embedded database (probably SQLite) for distribution. What tools/processes are available for such an export, or is it a practice to be avoided? EDIT: A couple of additional pieces of information. The distributed application should be able to run without having to connect to another server (ex: your spellchecker still works even you don't have internet), and I don't want to install a full DB server for read-only access to the data.

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• Caching Models in rails

  - by jules

  I have a rails application, with a model that is a kind of repository. The records stored in the DB for that model are (almost) never changed, but are read all the time. Also there is not a lot of them. I would like to store these records in cache, in a generic way. I would like to do something like acts_as_cached, but here are the issue I have: I can not find a decent documentation for acts as cached (neither can I find it's repository) I don't want to use memcached, but something simpler (static variable, or something like that). Do you have any idea of what gems I could use to do that ? Thanks

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• need export query rather than creating file for mysqldump without triggers.. See description

  - by OM The Eternity

  I have code as $db_name = "db"; $outputfile = "/somewhere"; $new_db_name = 'newdb'; $cmd = 'mysqldump --skip-triggers %s > %s 2>&1'; $cmd = sprintf($cmd, escapeshellarg($db_name), escapeshellcmd($output_file)); exec($cmd, $output, $ret); if ($ret !=0 ) { //log error message in $output } Then to import: $cmd = 'mysql --database=%s < %s 2>&1'; $cmd = sprintf($cmd, escapeshellarg($new_db_name), escapeshellcmd($output_file)); exec($cmd, $output, $ret); //etc. unlink($outputfile); Bow here what should i do to get the export query, rather than creating a file everytime?

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• ASPNET MVC what do you call this, a partial view? Or something else?

  - by JK

  I'm trying to google for info on a situation, but I dont know what it is called, so its hard to find results :) I have a model with say 10 fields. But only some of those are shown on a particular view, lets say 3 of them: id, name, date. What do you call this kind of view that does not display the whole model? A partial view? The problem is that because 7 fields are not sent to the view, when the Update action is called on the controller, those fields are null, and the DB gets updated with those 7 fields set to null.

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• JPA: Database Generated columns

  - by jpanewbie

  Hello, I am facing an issue with Hiebrnate and JPA. My requirement is column CreatedDTTM and LastUPDATEDDTTM should be populated at the DB level. I have tried following but no use. My columns are set NOT NULL. I get a "cannot insert Null into LastUpdatedDttm" exception. Any guidance is appreciated. @Column(name="LAST_UPDATED_DTTM", insertable=false, updatable=false, columnDefinition="Date default SYSDATE") @org.hibernate.annotations.Generated(value=GenerationTime.INSERT) @Temporal(javax.persistence.TemporalType.DATE) private Date lastUpdDTTM; @Column(name="CREATED_DTTM”, insertable=false, updatable=false) @org.hibernate.annotations.Generated(value=GenerationTime.ALWAYS) @Temporal(javax.persistence.TemporalType.DATE) private Date createdDTTM;

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• datediff rounding

  - by derekcohen

  I have a db table in SQL Server which contains a start date for a project. On a web status page I want to show how many days/weeks/months the project has run, the units depending on the duration. So under 21 days I'd show days, under 7 weeks I'd show weeks, otherwise show completed months. So I get the days, weeks and months values and can then use some code to decide which one to display. Suppose the project starts on 30 Dec 2010 and I'm checking today (27 Feb 2011). select datediff(d,'30 Dec 2010',getdate()) as days, datediff(wk,'30 Dec 2010',getdate()) as weeks , datediff(m,'30 Dec 2010',getdate())as months produces days: 59 weeks: 9 months: 2 But in fact the difference is 8 whole weeks and some rounding takes place. I've tried doing it in ASP as well, getting the start date and then doing the datediff() but it's no better. Is there a better way? thanks

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• delete all records except the id I have in a python list

  - by jay_t

  Hi all, I want to delete all records in a mysql db except the record id's I have in a list. The length of that list can vary and could easily contain 2000+ id's, ... Currently I convert my list to a string so it fits in something like this: cursor.execute("""delete from table where id not in (%s)""",(list)) Which doesn't feel right and I have no idea how long list is allowed to be, .... What's the most efficient way of doing this from python? Altering the structure of table with an extra field to mark/unmark records for deletion would be great but not an option. Having a dedicated table storing the id's would indeed be helpful then this can just be done through a sql query... but I would really like to avoid these options if possible. Thanks,

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• find users that are following other users

  - by Jakob

  Hi I'm wondering how I can go about this problem I have a DB with a Users Table, and a Followers table. The Followers table contains 2 Columns "FollowerID" and "FollowedID" I have a 1 - * relation in my datamodel between Users.ID -> Followers.FollowerID and Users.ID -> FollowedID How do I in LINQ get a set of users that are following a specific user? I'll express what I'm trying to achieve programatically I can get this far: ctx.Followers.Where(f => f.FollowedID == CurrentUser.ID) so now i have a Followers set where I have the ID of the users that follow the CurrentUser, and I could iterate through this collection and then add users after each iteration to a collection that would be a total USER collection that followed CurrentUser, but isn't there a smarter, or LINQ'er way to do this? Much appreciated Thx

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• How to generate JSON object on client side and send it to server?

  - by EugeneS

  I have ExtJS based application. I have compound object on the server side, and have ExtJS window with few tabs for editing different parts of this one object. For example: I Have Compound object "Car" public class Car { public string Name; public string Color; public List Wheels; public List Doors; } And on my ExtJS window i have tabs ("General Info", "Wheels", "Doors") for editing different parts of this object. So what i want: When i want to create a new car i want to generate JSON configuration for my class "Car" like {Name:null; Color:null; Wheels:[]; Doors:[]} then sent it to the client, fill it on the client (without callbacks to server) and after user finishes creating his Car object (he added wheels, doors, set name and color) and press save, I want to sent this filled(generated) JSON object to server and save it to DB. Is it possible? Thanks

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• Cannot find the certificate

  - by user409756

  We get a T-SQL (SQL Server 2008 R2) error on BACKUP CERTIFICATE: ERROR_NUMBER 15151, SEVERITY 16, STATE 1, PROCEDURE -, LINE 8, MESSAGE: Cannot find the certificate 'certificate1', because it does not exist or you do not have permission. We can see the certificate in master.sys.certificates. Our pseudo-code: copy an unattached template_db to db1 attach db1 create certificate1 (in stored procedure in master db) generate @password CREATE DATABASE ENCRYPTION KEY … ENCRYPTION BY SERVER CERTIFICATE '+@certificate_name +… (in stored procedure in db1) turn on Transparent Database Encryption for db1 using certificate1. (N'ALTER DATABASE '+@db_name+N' SET ENCRYPTION ON') N’BACKUP CERTIFICATE '+@certificate_name+N' TO FILE = '''+@certificate_file_path+N''' WITH PRIVATE KEY ( FILE = '''+@private_key_file_path+N''', ENCRYPTION BY PASSWORD = '''+@password+N'''' To try to work-around the error, we tested three ways with the BACKUP CERTIFICATE code in a different databases each time, including db1 and master. All get the same error. Any ideas? Thanks.

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• Regex: How to leave out webding font characters?

  - by DS

  Hi, I've a free text field on my form where the users can type in anything. Some users are pasting text into this field from Word documents with some weird characters that I don't want to go in my DB. (e.g. webding font characters) I'm trying to get a regular expression that would give me only the alphanum and the punctuation characters. But when I try the following, the output is still all the characters. How can I leave them out? <html><body><script type="text/javascript">var str="???????";document.write(str.replace(/[^a-zA-Z 0-9 [:punct]]+/g, " "));</script></body></html>

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• Read [for xml auto, elements] into DataTable in ADO.NET

  - by ihorko

  Hello All! I have MS SQL Server stored procedure that returns XML (it uses SELECT with for xml auto, elements) I tried read it into DataTable: DataTable retTable = new DataTable(); SqlCommand comm = new SqlCommand("exec MySP", connection); SqlDataAdapter da = new SqlDataAdapter(comm); connection.Open(); da.Fill(retTable); but retTable contains 12 rows with separated full xml thar SQL Server returns. How can I read that XML from DB into DataTable object? Thanks!

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• Is it possible to implement a lightweight database using Blackberry Persistance options?

  - by Tobias

  First I would like to explain why I want to use alternate Blackberry Persistance options rather than a Blackberry database itself, say SQLite. The reason is that the application i'm designing, I want it to be used in all the previous versions of Blackberry rather than just the ones having OS 5.0 or greater. Now, coming back to the actual question, I have got a database that I want to replicate to be used in the Blackberry application. The database has 8 tables and each table has approximately 12 different columns. One of the table has 1000 rows. Now if I was to implement this DB for a Blackberry application , keeping in mind that it will work on all the versions of Blackberry, what would be the best way to implement it?

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• Split query result by half in TSQL (obtain 2 resultsets/tables)

  - by rubdottocom

  I have a query that returns a large number of heavy rows. When I transform this rows in a list of CustomObject I have a big memory peak, and this transformation is made by a custom dotnet framework that I can't modify. I need to retrieve a less number of rows to do "the transform" in two passes and then avoid the momery peak. How can I split the result of a query by half? I need to do it in DB layer. I thing to do a "Top count(*)/2" but how to get the other half? Thank you!

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• SQL - Break a start/end time into 15 minute records

  - by Chu

  I've got a record set that consists of a start and end time in two separate fields: id - Int startTime - DateTime endTime - DateTime I'd like to find a way to query a record and return it as X records based on the number of 15 minute intervals found between the start and end times. For example, let's say I have a record like this: id, StartTime, EndTime 1, 1/1/2010 8:28 AM, 1/1/2010 8:47 AM I would return 3 records, the first would represent the 8:15 interval, #2 for the 8:30 interval and then a 3rd for the 8:45 interval. I realize this could be done using logic in an sproc, but we are trying to remain db neutral as we support multiple database engines.

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