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  • Convert var to DataTable

    - by cre-johnny07
    I have var item which I want to convert in to a Datatable. How can I do this. var items = (from myObj in this.Context.Orders group myObj by myObj.OrderDate.ToString("yyyy-mm") into ymGroup select new { Date = ymGroup.Key, Start = ymGroup.Min(c => c.OrderId), End = ymGroup.Max(c => c.OrderId) }); I need to convert the items into a DataTable. I don't want to use any foreach loop. How can I do this.?

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  • Firebird sequence-backed ID shorthand

    - by pilcrow
    What do others do to simplify the creation of simple, serial surrogate keys populated by a SEQUENCE (a.k.a. GENERATOR) in Firebird = 2.1? I finc the process comparatively arduous: For example, in PostgreSQL, I simply type: pg> CREATE TABLE tbl ( > id SERIAL NOT NULL PRIMARY KEY, > ... In MySQL, I simply type: my> CREATE TABLE tbl ( > id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, > ... But in Firebird I type: fb> CREATE TABLE tbl ( > id BIGINT NOT NULL PRIMARY KEY, > ... fb> CREATE SEQUENCE tbl_id_seq; fb> SET TERM !!; > CREATE TRIGGER tbl_id_trg FOR tbl > ACTIVE BEFORE INSERT POSITION 0 > AS > BEGIN > IF ((new.id IS NULL) OR (new.id <= 0)) THEN > BEGIN > new.id = GEN_ID(tbl_id_seq, 1); > END > END !! > SET TERM ; !! ... and I get pretty bored by the time I reach trigger definition. However, I routinely make SEQUENCE-backed ID fields for temporary, developement and throw-away tables. What do others do to simplify this? Work with an IDE? Run a pre-processing, in-house perl script over the DDL file? Etc.

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  • Linq to SQL DataContext Windsor IoC memory leak problem

    - by Mr. Flibble
    I have an ASP.NET MVC app that creates a Linq2SQL datacontext on a per-web-request basis using Castler Windsor IoC. For some reason that I do not fully understand, every time a new datacontext is created (on every web request) about 8k of memory is taken up and not released - which inevitably causes an OutOfMemory exception. If I force garbage collection the memory is released OK. My datacontext class is very simple: public class DataContextAccessor : IDataContextAccessor { private readonly DataContext dataContext; public DataContextAccessor(string connectionString) { dataContext = new DataContext(connectionString); } public DataContext DataContext { get { return dataContext; } } } The Windsor IoC webconfig to instantiate this looks like so: <component id="DataContextAccessor" service="DomainModel.Repositories.IDataContextAccessor, DomainModel" type="DomainModel.Repositories.DataContextAccessor, DomainModel" lifestyle="PerWebRequest"> <parameters> <connectionString> ... </connectionString> </parameters> </component> Does anyone know what the problem is, and how to fix it?

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  • Removing an Entity from an EntitySet during Iteration...

    - by Gregorius
    I've got this code... seems nice and elegant, but apparently the framework don't like it when i mess with a collection while iterating through it: foreach (KitGroup kg in ProductToTransfer.KitGroups) { // Remove kit groups that have been excluded by the user if (inKitGroupExclusions != null && inKitGroupExclusions.Contains(kg.KitGroupID)) ProductToTransfer.KitGroups.Remove(kg); else { // Loop through the kit items and do other stuff //... } } The error it throws when it iterates to the 2nd object in the collection is: "EntitySet was modified during enumeration" I know i could create a new collection of KitGroup objects (or even just IDs) that i want to remove, and then another loop afterwards to loop through these, and remove them from the collection, but this just seems like unnecessary extra code... can anybody suggest a more elegant way of achieving the same thing? Cheers Greg

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  • SQLite3, "ALTER TABLE" and durability

    - by Bill
    I'd like to run some ALTER TABLE statements on a sqlite3 database. What happens if the user kills the process or the power is cut while the ALTER TABLE is running? Will the database be left in a corrupt intermediate state?

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  • xp_smtp_sendmail blank space added to html randomly

    - by Igor Timofeyev
    I have a proc where I generate small html doc with a link and send it out via xp_smtp_sendmail proc. Link is generated based on query results and is long. This works in most cases. However, sometimes the link gets broken due to spaces being inserted into querystring variable names, i.e. &Na me=John. This might vary between email clients(same link works in Gmail, but might not work in comcast due to spaces. The space seems to be randomly inserted, so in each broken email link space might break other querystring variables. When I do PRINT from proc the link is clean, no spaces. Here's my sample of the mail proc being executed within main proc(that gets query results and generates html for @Message). The space seems to be inserted regardless of whether I encode the url or not. Thank you in advance for your help. I can send a cleaner version of the code if it's not displayed properly here. ....query results above SET @Message = NULL SET @Message = @Message + + '<br/>Dear ' + @FirstName + ' ' + @LastName + ',' + '<br/><br/>Recently you took "' + @Title + '". ' + 'In response to the question "What is it?" ' + 'you responded "' + @Response + '".' + '<br/><br/>Following up on previous mailing' + '<br/><br/>Please click on the link below' + '<br/><br/><a href="' + @Link + '">Please click here</a>' + '<br/><br/>plain text' + '<br/><br/>plain text,' + '<br/><br/>plain text<br/> plain text<br/> plain text<br/> plain text<br/> plain text<br/> plain text EXEC @rc = master.dbo.xp_smtp_sendmail @FROM = '[email protected]', @FROM_NAME = 'Any User', @TO = @Email, @priority = N'NORMAL', @subject = N'My email', @message = @Message, @messagefile = N'', @type = N'text/html', @attachment = N'', @attachments = N'', @codepage = 0, @server = 'smtp.server.any'

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  • Database warehouse design: fact tables and dimension tables

    - by morpheous
    I am building a poor man's data warehouse using a RDBMS. I have identified the key 'attributes' to be recorded as: sex (true/false) demographic classification (A, B, C etc) place of birth date of birth weight (recorded daily): The fact that is being recorded My requirements are to be able to run 'OLAP' queries that allow me to: 'slice and dice' 'drill up/down' the data and generally, be able to view the data from different perspectives After reading up on this topic area, the general consensus seems to be that this is best implemented using dimension tables rather than normalized tables. Assuming that this assertion is true (i.e. the solution is best implemented using fact and dimension tables), I would like to seek some help in the design of these tables. 'Natural' (or obvious) dimensions are: Date dimension Geographical location Which have hierarchical attributes. However, I am struggling with how to model the following fields: sex (true/false) demographic classification (A, B, C etc) The reason I am struggling with these fields is that: They have no obvious hierarchical attributes which will aid aggregation (AFAIA) - which suggest they should be in a fact table They are mostly static or very rarely change - which suggests they should be in a dimension table. Maybe the heuristic I am using above is too crude? I will give some examples on the type of analysis I would like to carryout on the data warehouse - hopefully that will clarify things further. I would like to aggregate and analyze the data by sex and demographic classification - e.g. answer questions like: How does male and female weights compare across different demographic classifications? Which demographic classification (male AND female), show the most increase in weight this quarter. etc. Can anyone clarify whether sex and demographic classification are part of the fact table, or whether they are (as I suspect) dimension tables.? Also assuming they are dimension tables, could someone elaborate on the table structures (i.e. the fields)? The 'obvious' schema: CREATE TABLE sex_type (is_male int); CREATE TABLE demographic_category (id int, name varchar(4)); may not be the correct one.

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  • ORA-00904: "FORMAT": invalid identifier

    - by gary A.K.A. G4
    I am trying to format a date: FORMAT(table.TCKT.TCKT_ISS_DATE, 'YYYY') AS TICKETYEAR but I am getting the following error: ORA-00904: "FORMAT": invalid identifier Right now the date show the complete timestamp. Any suggestions on how to fix this problem, or any other way to format the date to just show the four digit year?

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  • Dataset and SQLCe in .net 4

    - by Tyler Edwards
    I'm trying to build a SQLCe table structure dynamically using a dataset as the temporary table structure... Is there a SqlConnection string that will work with SqlCe? There used to be a SqlCeConnection...but I don't find that in the 4.0 framework? Has something replaced this? If the answer is L2S or Entity Framework...can I add columns to SqlCe tables at runtime? If so...how?

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  • One check constraint or multiple check constraints?

    - by RenderIn
    Any suggestions on whether fewer check constraints are better, or more? How should they be grouped if at all? Suppose I have 3 columns which are VARCHAR2(1 BYTE), each of which is a 'T'/'F' flag. I want to add a check constraint to each column specifying that only characters IN ('T', 'F') are allowed. Should I have 3 separate check constraints, one for each column: COL_1 IN ('T', 'F') COL_2 IN ('T', 'F') COL_3 IN ('T', 'F') Or a single check constraint: COL_1 IN ('T', 'F') AND COL_2 IN ('T', 'F') AND COL_3 IN ('T', 'F') My thoughts are it is best to keep these three separate, as the columns are logically unrelated to each other. The only case I would have a check constraint that examines more than one column is if there was some relationship between the value in one and the value in another, e.g.: (PARENT_CNT > 0 AND PRIMARY_PARENT IS NOT NULL) OR (PARENT_CNT = 0 AND PRIMARY_PARENT IS NULL)

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  • Synchronize a client database with the central database

    - by Pavan Kumar
    I need to update existing data or insert new data from client database say DB1 into central database say DB2 both holding same schema and both databases reside in same machine. The updates are not biderectional. I just want changes to be reflected from client(DB1) to server(DB2). How do i achieve this using C# .NET ? Can anyone provide an example ?

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  • I can't make this query work with SUM function

    - by Mehper C. Palavuzlar
    This query gives an error: select ep, case when ob is null and b2b_ob is null then 'a' when ob is not null or b2b_ob is not null then 'b' else null end as type, sum(b2b_d + b2b_t - b2b_i) as sales from table where ... group by ep, type Error: ORA-00904: "TYPE": invalid identifier When I run it with group by ep, the error message becomes: ORA-00979: not a GROUP BY expression The whole query works OK if I remove the lines sum(b2b_d+b2b_t-b2b_i) as sales and group by ..., so the problem should be related to SUM and GROUP BY functions. How can I make this work? Thanks in advance for your help.

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  • NHibernate HiLo generation and SQL 2005/8 Schemas

    - by Kirk Clawson
    I have an issue on my hands that I've spent several days searching for an answer to no avail... We're using HiLo Id generation, and everything seems to be working fine, as long as the entity table is in the same schema as the hibernate_unique_key table. The table structure is pretty simple. I have my hi value table in the db as dbo.hibernate_unique_key. Several entity table are also in the dbo schema, and they work without issue. Then we have tables under the "Contact" schema (such as Contact.Person and Contact.Address). In the Person Mapping file: <class name="Person" table="Person" schema="Contact"> <id name="Id" unsaved-value="0"> <generator class="hilo"> <param name="max_lo">100</param> </generator> </id> ... When I try to insert a Person entity, I get an error of "Invalid object name 'Contact.hibernate_unique_key'. That error is certainly clear enough. So I add: <param name="schema">dbo</param> to my mapping file/generator element. Now, when the SessionFactory is built, I get a "An item with the same key has already been added." error. So now I'm a bit stuck. I can't leave the HiLo generator without a schema, because it picks up the schema from the Class, and I can't specify the schema because it's already been added (presumably because it's my "default_schema" as identified in my XML cfg file). Am I completely hosed here? Must I either A) Keep all my tables in the dbo schema or B) Create a separate HiLo Key table for each unique schema in the DB? Neither of those scenarios is particularly palatable for my application, so I'm hoping that I can "fix" my mapping files to address this issue.

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  • How do i create a table dynamically with dynamic datatype from a PL/SQL procedure

    - by Swapna
    CREATE OR REPLACE PROCEDURE p_create_dynamic_table IS v_qry_str VARCHAR2 (100); v_data_type VARCHAR2 (30); BEGIN SELECT data_type || '(' || data_length || ')' INTO v_data_type FROM all_tab_columns WHERE table_name = 'TEST1' AND column_name = 'ZIP'; FOR sql_stmt IN (SELECT * FROM test1 WHERE zip IS NOT NULL) LOOP IF v_qry_str IS NOT NULL THEN v_qry_str := v_qry_str || ',' || 'zip_' || sql_stmt.zip || ' ' || v_data_type; ELSE v_qry_str := 'zip_' || sql_stmt.zip || ' ' || v_data_type; END IF; END LOOP; IF v_qry_str IS NOT NULL THEN v_qry_str := 'create table test2 ( ' || v_qry_str || ' )'; END IF; EXECUTE IMMEDIATE v_qry_str; COMMIT; END p_create_dynamic_table; Is there any better way of doing this ?

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  • Is there an OR filter? - Django

    - by RadiantHex
    Hi folks, is there any way of doing the following Unicorn.objects.or_filter(magical=True).or_filter(unicorn_length=15).or_filter(skin_color='White').or_filter(skin_color='Blue') where or_filter stands for an isolated match I remember using something similar but cannot find the function anymore! Help would be great! Thanks :)

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  • Microsoft T-SQL Counting Consecutive Records

    - by JeffW
    Problem: From the most current day per person, count the number of consecutive days that each person has received 0 points for being good. Sample data to work from : Date Name Points 2010-05-07 Jane 0 2010-05-06 Jane 1 2010-05-07 John 0 2010-05-06 John 0 2010-05-05 John 0 2010-05-04 John 0 2010-05-03 John 1 2010-05-02 John 1 2010-05-01 John 0 Expected answer: Jane was bad on 5/7 but good the day before that. So Jane was only bad 1 day in a row most recently. John was bad on 5/7, again on 5/6, 5/5 and 5/4. He was good on 5/3. So John was bad the last 4 days in a row. Code to create sample data: IF OBJECT_ID('tempdb..#z') IS NOT NULL BEGIN DROP TABLE #z END select getdate() as Date,'John' as Name,0 as Points into #z insert into #z values(getdate()-1,'John',0) insert into #z values(getdate()-2,'John',0) insert into #z values(getdate()-3,'John',0) insert into #z values(getdate()-4,'John',1) insert into #z values(getdate(),'Jane',0) insert into #z values(getdate()-1,'Jane',1) select * from #z order by name,date desc

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  • Full Text Search MSSQL2008 show wrong display_item for Thai Language

    - by ensecoz
    I am working on MSSQL2008. My task is to investigate the issue that why FTS cannot find the right result for Thai. First, I am having the table which enable the FTS on the column 'ItemName' which is nvarchar. The Catalog is created with the Thai Language. Note that, Thai language is one of the language that doesn't separate the word by space so '????' '???' '????' are written like this in the sentence '???????????' In the table, there are many rows that include the word (????) for examples row#1 (ItemName: '???????????') On the webpage, I try to search for '????' but SQLServer cannot find it. So I try to investigate it by trying the following query in SQLServer select * from sys.dm_fts_parser(N'"???????????"', 1054, 0, 0) To see how the words are broken. The first one is the text to be break. The second parameter is specify that using Thai (WorkBreaker, so on). and here is the result: row#1 (display_item: '????', source_item: '???????????') row#2 (display_item: '????', source_item: '???????????') row#3 (display_item: '??', source_item: '???????????') Notice that the first and second row display the worng display_item '?' in the '????' isn't even Thai characters. '?' in '????' is not Thai charater either. So the question is where is those alien characters come from? I guess this i why I cannot search for '????' because the word breaker is mis-borken and keeping the wrong character in the indexes. Please help!

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  • all rows plus min / max values using a single stored procedure

    - by Rajeev
    I have a custom data source which pulls out data form a flat file. The flat file contains a timestamp , source and data. I can use sp_execute to execute a select query against the flat file. I'm currently using 2 stored procedures . - one which runs a select * from flat_file into a temp table - the other which does a select min/max from flat_file grouping by source into another temp file Im using the data retrieved using the stored procedures in a SSRS report Is is possible in a a single stored procedure to retrieve all the rows from the file within a date range and also identify the min/max values for each group retrieved ?e

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  • moving to NoSql

    - by radi
    hi , i recently read this article nosql-vs-rdbms and i dont know too much about nosql and i didnt use it in my projects , so i have some questions : what is the main feature that nosql has over Rdbms ? if you think that it is best than rdbms : where and how i can learn about it (books - tutorials)? i want to be a DBA , what this career will be after moving to nosql ? thanks

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  • moving to NoSql

    - by radi
    hi , i recently read this article nosql-vs-rdbms and i dont know too much about nosql and i didnt use it in my projects , so i have some questions : what is the main feature that nosql has over Rdbms ? if you think that it is best than rdbms : where and how i can learn about it (books - tutorials)? i want to be a DBA , what this career will be after moving to nosql ? thanks

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  • Database Design sugessition

    - by Manoj kumar
    I am in the plan of building a information service website similar to http://us.justdial.com/, I was in the confusion of designing the database. The datas stored in the database are List of categories Name of the company and its address, phone number, category, etc... (i am going to use MYSQL Database) how could i design the database that makes the accessing of those data easier ? Thanks in advance

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  • How to tell if a datareader is open on a connection and close it

    - by Earlz
    Hi, I'm setting up a little thing for connection pooling and on of the more common bugs that we have occur(its always an easy fix, but we just can't remember reader.Close()!) it is when we have a connection that is used by a lot of classes/methods and one method opens a data reader and forgets to close it. This isn't really bad cause a lot of times all you have to do is go into the debugger and go up one level and see the function before it was and check if it had an unclosed data reader. Now, here is the bigger problem. In this connection pool, if a datareader is open, then it's not known until a thread gets a connection and tries to use it and the thing that originally opened the data reader may no longer even be alive. So quite simply, how can you detect if a data reader is open on a connection and is there a way to close the reader without closing the connection?

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  • Sync Framework,LINQ, and my DAL

    - by Refracted Paladin
    I am creating a WPF app that needs to allow users to work in a temporary disconnected state and I plan to use a Local Database Cache. My question's are about my data access layer. Do you typically create the whole DAL to point at the Cache or both and create a switching mechanism? Is Entity's a good way to go for my DAL against the Cache? I am used to L2S but my understanding is that I can't use that against SQLCE, correct? Thanks! PS: Any good resources out there for using Sync, Linq, and WPF ALL TOGETHER? Tutorials, videos, etc?

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