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• Most efficient way to update a MySQL Database on a Linux host with that of an ASP.Net Form on Window

  - by NJTechGuy

  My kind webhost (1and1) royally asked me to go elsewhere to do something like this. I have 2 sites. One of them was developed by a .Net programmer. Now I am contracted to implement a PHP site and fetch data from the .Net site. There is an ASP.Net form that a customer fills and when they hit submit, the data gets stored in SQL Server DB. How do I also store the same data in MySQL parallelly? I cannot directly use some database connectors with ASP.Net since MySQL connectivity is not supported on 1and1 Windows hosting (biz account, no less!). What I thought of is to publish an RSS feed of entries in ASP.Net site and routinely scrape that data into MySQL on Linux host. It is an overkill, I know. Not efficient. I thought I would pick the best brains on SOF to get a different, efficient opinion. Thanks in advance guys...

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• How to retrieve all errors and messages from a query using ADO

  - by Johan Levin

  When a SQL batch returns more than one message from e.g. print statements, then I can only retrieve the first one using the ADO connection's Errors collection. How do I get the rest of the messages? If I run this script: Option Explicit Dim conn Set conn = CreateObject("ADODB.Connection") conn.Provider = "SQLOLEDB" conn.ConnectionString = "Data Source=(local);Integrated Security=SSPI;Initial Catalog=Master" conn.Open conn.Execute("print 'Foo'" & vbCrLf & "print 'Bar'" & vbCrLf & "raiserror ('xyz', 10, 127)") Dim error For Each error in conn.Errors MsgBox error.Description Next Then I only get "Foo" back, never "Bar" or "xyz". Is there a way to get the remaining messages?

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• Speed up multiple JDBC SQL querys?

  - by paddydub

  I'm working on a shortest path a* algorithm in java with a mysql db. I'm executing the following SQL Query approx 300 times in the program to find route connections from a database of 10,000 bus connections. It takes approx 6-7 seconds to execute the query 300 times. Any suggestions on how I can speed this up or any ideas on a different method i can use ? Thanks ResultSet rs = stmt.executeQuery("select * from connections" + " where Connections.From_Station_stopID ="+StopID+";"); while (rs.next()) { int id = rs.getInt("To_Station_id"); String routeID = rs.getString("To_Station_routeID"); Double lat = rs.getDouble("To_Station_lat"); Double lng = rs.getDouble("To_Station_lng"); int time = rs.getInt("Time"); }

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• How to add additional rows to result set by condition

  - by Puzzled

  I have a table like this: ObjId Date Value 100 '20100401' 12 200 '20100501' 45 200 '20100401' 37 300 '20100501' 75 300 '20100401' 69 400 '20100401' 87 I have to add additional rows to result set for objId's, where there is no data at '20100501' **100 '20100501' null** 100 '20100401' 12 200 '20100501' 45 200 '20100401' 37 300 '20100501' 75 300 '20100401' 69 **400 '20100501' null** 400 '20100401' 87 What is the best way to do this? Here is the T-SQL script for the initial table: declare @datesTable table (objId int, date smalldatetime, value int) insert @datesTable select 100, '20100401', 12 union all select 200, '20100501', 45 union all select 200, '20100401', 37 union all select 300, '20100501', 75 union all select 300, '20100401', 69 union all select 400, '20100401', 87 select * from @datesTable

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• SSIS Script Component, Allow Null values

  - by user2471943

  I have a SSIS package that I am programming and my script component won't allow null column inputs. I have checked the box to keep nulls in the flat file source component. My program is running well until my script component where I get the error "The column has a null value" (super vague, I know). The column currently throwing the error is an "int" valued column and is used for aggregations in my script. I could make the null values 0s or to say "NULL" but I'd prefer to just leave them blank. Any advice on how to handle this problem would be greatly appreciated! Thanks in advance! I am using SQL Server BIDS 2008.

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• C# Dynamic Query Without A Database Model

  - by hitopp

  I have been searching the web for a solution to dynamic queries. I have found many different solutions (e.g. Linq to Sql, Dynamic Linq Expressions, Dynamic Query), but all of these solutions involve some sort of previous knowledge of the database (like a model in code). Maybe what I am asking is way off the deep end, but is there any possible way to dynamically query a database without a model? For example, a database has a Customers table with the following columns: CustomerID Name FavoriteColor I want to create a query as SELECT Name FROM Customers WHERE @0 = @1, where the two placeholders are populated dynamically. The resulting data does not tie to a model class and I would prefer to use some sort of framework to build the queries, not simple string concatenation. The System.Linq.Dynamic namespace came really close to fulfilling this request, but it uses a database model. I realize this is crazy, but I was just curious.

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• How to show previous day values in query

  - by Hakan

  I am going to be crazy I think. Please Help. I have a table which fields are Date, No, Turnover, TotalWin, Opencredit, Handpay, Billin, gamesplayed and I am trying to write sql in vb.net that will show me previous day value but I cant. Here is what I am trying to do. SELECT Meter.* FROM Meter AS Previous, Turnover As Prev_turnover WHERE Date = ' SELECT Max(Date) FROM Meter AS Previous2 WHERE Previous2.Date < Date AND Previous2.No = ‘No' AND Previous.No = ‘No’ What is wrong in where I am doing mistake I really don't know. If anyone help will be appreciated. Thanks

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• Problem with testing a Windows service

  - by prateeksaluja20

  I want to make a Windows service that will access my database. My database is SQL Server 2005. Actually I am working on a website and my database is inside our server. I need to access my database every second and update the records. For that purpose I need to make a Windows service that will install into our server and perform the task. I have been accessing the database from my local machine and then running the service, but problem is I'm not sure how I can test this service. I tried to install into my local machine. It installed and then I ran the service but it did not perform the task and I think service is not able to connect with the database. There is no problem in the service nor its installer. The only issue is how to test my Windows service.

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• Trigger for insert table

  - by shanks

  I have sql server 2005 and need to create trigger for insert query. I have Table naemd as "Log" with column named as UserID,UserName,LogDate,LogTime and want to transfer data into other table named as "DataTable" with same column name. I have created trigger GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER [dbo].[Transfer] on [dbo].[Log] AFTER INSERT AS BEGIN insert into DataTable (UserID,UserName,LogDate,LogTime) SELECT UserID,UserName,LogDate,LogTime FROM Log where UserID not in(select UserID from DataTable) END New Data is updated on daily basis in "Log" table and so i want to transfer new data from Log table to DataTable with trigger.Execution time is very high and so no output .

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• Inline Conditional Statement in Stored Procedure

  - by Jason

  Here is the pseudo-code for my inline query in my code: select columnOne from myTable where columnOne = '#variableOne#' if len(variableTwo) gt 0 and columnTwo = '#variableTwo#' end I would like to move this into a stored procedure but am having trouble building the query correctly. I assume it would be something like select columnOne from myTable where columnOne = @variableOne CASE WHEN len(@variableTwo) <> 0 THEN and columnTwo = @variableTwo END This is giving me a syntax error. Could someone tell me what I've got wrong. Also, I would like to keep it to only one query and not just have one if statement. Also, I do not want to build the sql in the stored procedure and run Exec() on it.

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• LINQ to Entity, joining on NOT IN tables

  - by SlackerCoder

  My brain seems to be mush right now! I am using LINQ to Entity, and I need to get some data from one table that does NOT exist in another table. For example: I need the groupID, groupname and groupnumber from TABLE A where they do not exist in TABLE B. The groupID will exist in TABLE B, along with other relevant information. The tables do not have any relationship. In SQL it would be quite simply (there is a more elegant and efficient solution, but I want to paint a picture of what I need) SELECT GroupID, GroupName, GroupNumber, FROM TableA WHERE GroupID NOT IN (SELECT GroupID FROM TableB) Is there an easy/elegant way to do this? Right now I have a bunch of queries hitting the db, then comparing, etc. It's pretty messy. Thanks.

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• How to properly reserve identity values for usage in a database?

  - by esac

  We have some code in which we need to maintain our own identity (PK) column in SQL. We have a table in which we bulk insert data, but we add data to related tables before the bulk insert is done, thus we can not use an IDENTITY column and find out the value up front. The current code is selecting the MAX value of the field and incrementing it by 1. Although there is a highly unlikely chance that two instances of our application will be running at the same time, it is still not thread-safe (not to mention that it goes to the database everytime). I am using the ADO.net entity model. How would I go about 'reserving' a range of id's to use, and when that range runs out, grab a new block to use, and guarantee that the same range will not be used.

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• How to position columns in select list based on a variable.

  - by Rohit

  I am creating a dynamic grid which is created by selecting the format defined in the below XML.My select list includes all columns in this XML,I want to position these columns columns on the basic of position attribute in XML. <gridFormat> <column property="CustomerID" dbName="CustName" HeaderText="Customer" IsVisible="0" Position="1" /> <column property="CustomerName" dbName="FacilityName" HeaderText="Facility" IsVisible="1" Position="3" /> <column property="FacilityInternalID" dbName="Pname" HeaderText="Patient" IsVisible="1" Position="2" /> </gridFormat> I cannot select them in the order specified by the position attribute. I can do it in C# by looping around the returned datatable and specifically position columns using datatable.columns.setordinal() method. Is there any better way in SQL or C# to accomplish this.

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• Is there alternative way to write this query?

  - by Kugel

  I have tables A, B, C, where A represents items which can have zero or more sub-items stored in C. B table only has 2 foreign keys to connect A and C. I have this sql query: select * from A where not exists (select * from B natural join C where B.id = A.id and C.value > 10); Which says: "Give me every item from table A where all sub-items have value less than 10. Is there a way to optimize this? And is there a way to write this not using exists operator?

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• n-grams from text in PostgreSQL

  - by harshsinghal

  I am looking to create n-grams from text column in PostgreSQL. I currently split(on white-space) data(sentences) in a text column to an array. select regexp_split_to_array(sentenceData,E'\s+') from tableName Once I have this array, how do I go about: Creating a loop to find n-grams, and write each to a row in another table Using unnest I can obtain all the elements of all the arrays on separate rows, and maybe I can then think of a way to get n-grams from a single column, but I'd loose the sentence boundaries which I wise to preserve. Sample SQL code for PostgreSQL to emulate the above scenario create table tableName(sentenceData text); INSERT INTO tableName(sentenceData) VALUES('This is a long sentence'); INSERT INTO tableName(sentenceData) VALUES('I am currently doing grammar, hitting this monster book btw!'); INSERT INTO tableName(sentenceData) VALUES('Just tonnes of grammar, problem is I bought it in TAIWAN, and so there aint any englihs, just chinese and japanese'); select regexp_split_to_array(sentenceData,E'\s+') from tableName; select unnest(regexp_split_to_array(sentenceData,E'\s+')) from tableName;

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• Django complex queries

  - by Josh K

  I need to craft a filter for an object that checks date ranges. Right now I'm performing a very inefficient loop which checks all the objects. I would like to simplify this to a database call. The logic is you have a start and an end date objects. I need to check if the start OR the end is within the range of an appointment. if (start >= appointment.start && start < appointment.end) || (end > appointment.start && end <= appointment.end) I could do this in SQL, but I'm not as familiar with the Django model structure for more complex queries.

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• Format SQL Query Result into web menu

  - by highwingers

  I am trying to bhuild a drill down menu for my website, where user will click on a category and it will show the subcategories of that clicked category, there could be n-levels. I am able to write sql query which returns the output exactaly as I want, but the problem is...I dont want to show the whole menu to end user, I would like to open/expand only clicked category. my Query output is: 1 IPTV 2 Jadoo Tv 3 Shava Tv 4 Jalva Tv 5 Programming 6 Microsoft 7 Asp.Net 8 PHP so by default IPTV & Programming Should be displayed, since they are parent, and when I click on IPTV it should open the children of IPTV, like I said there could be n-levels. I was thinking, I can load the output of query to webpage and then control the menu navigation with css/javascript. do you guys have any ideas?

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• Updating a table with the max date of another table

  - by moleboy

  In Oracle 10g, I need to update Table A with data from Table B. Table A has LOCATION, TRANDATE, and STATUS. Table B has LOCATION, STATUSDATE, and STATUS I need to update the STATUS column in Table A with the STATUS column from Table B where the STATUSDATE is the max date upto and including the TRANDATE for that LOCATION (basically, I'm getting the status of the location at the time of a particular transaction). I have a PL/SQL procedure that will do this but I KNOW there must be a way to get it to work using an analytic, and I've been banging my head too long. Thanks!

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• How to approach this SQL query

  - by Kim

  I have data related as follows: A table of Houses A table of Boxes (with an FK back into Houses) A table of Things_in_boxes (with an FK back to Boxes) A table of Owners (with an FK back into Houses) In a nutshell, a House has many Boxes, and each Box has many Things in it. In addition, each House has many Owners. If I know two Owners (say Peter and Paul), how can I list all the Things that are in the Boxes that are in the Houses owned by these guys? Also, I'd like to master this SQL stuff. Can anyone recommend a good book/resource? (I'm using MySQL). Thanks!

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• Linq Query - Average Time (DateTime data types)

  - by Jade

  I have a database that has the following records in a DateTime field: 2012-04-13 08:31:00.000 2012-04-12 07:53:00.000 2012-04-11 07:59:00.000 2012-04-10 08:16:00.000 2012-04-09 15:11:00.000 2012-04-08 08:28:00.000 2012-04-06 08:26:00.000 I want to run a linq to sql query to get the average time from the records above. I tried the following: (From o In MYDATA Select o.SleepTo).Average() Since "SleepTo" is a datetime field I get an error on Average(). If I was trying to get the average of say an integer, the above linq query works. What do I need to do to get it to work for datetimes?

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• Auto-generated values for columns in database

  - by Jamal

  Is it a good practice to initialize columns that we can know their values in database, for example identity columns of type unique identifier can have a default value (NEWID()), or columns that shows the record create date can have a default value (GETDATE()). Should I go through all my tables and do this whereever I am sure that I won't need to assign the value manually and the Auto-generated value is correct. I am also thinking about using linq-to-sql classes and setting the "Auto Generated Value" property of these columns to true. Maybe this is what everybody already knows or maybe I am asking a question about a fundamental issue, if so please tell me.

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• Linq ChangeConflictException occurs when submitting DataContext changes

  - by Alex

  System.Data.Linq.ChangeConflictException: 2 of X updates failed. at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode) at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode) at PROJECT.Controllers.HomeController.ClickProc(Int32 id, String code, String n) This is what I get very often. This action is done thousands of times a day, and I get this exception about once every 5 seconds. From what I understand it happens when something changes in the database in the period between creating DataContext and updating it. Am I right? How can I fix it? Update I just debugged the error and found the following: Table name: dbo.Stats current value: 9852039 original value: 9852038 database value: 9852039 The Stats table is updated constantly. So how can I still make LINQ save the changes. With "classical" SQL Server access through SqlDataCommand I never had problems like that.

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• unique constraint (w/o Trigger) on "one-to-many" relation

  - by elgcom

  To illustrate the problem, I make an example: A tag_bundle consists of one or more than one tags. A unique tag combination can map to a unique tag_bundle, vice versa. tag_bundle tag tag_bundle_relation +---------------+ +--------+ +---------------+--------+ | tag_bundle_id | | tag_id | | tag_bundle_id | tag_id | +---------------+ +--------+ +---------------+--------+ | 1 | | 100 | | 1 | 100 | +---------------+ +--------+ +---------------+--------+ | 101 | | 1 | 101 | +--------+ +---------------+--------+ There can't be another tag_bundle having the combination from tag 100 and tag 101. How can I ensure such unique constraint when executing SQL "concurrently"!! that is, to prevent concurrently adding two bundles with the same tag combination Adding a simple unique constraint on any table does not work, Is there any solution other than Trigger or explicit lock. I come to only this simple way: make tag combination into string, and let it be unique. tag_bundle (unique on tags) tag tag_bundle_relation +---------------+--------+ +--------+ +---------------+--------+ | tag_bundle_id | tags | | tag_id | | tag_bundle_id | tag_id | +---------------+--------+ +--------+ +---------------+--------+ | 1 | 100,101| | 100 | | 1 | 100 | +---------------+--------+ +--------+ +---------------+--------+ | 101 | | 1 | 101 | +--------+ +---------------+--------+ but it seems not a good way :(

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• Validate data before uploading through SSIS

  - by The King

  I have a SSIS package to upload data from Excel file into an Sql Server 2005 table. The excel file will have varied lines of data ranging from 20k - 30k lines. The upload works fine, when all the data are correct. But obviously fails when there is a small problem even in a single row. Examples like mandatory values presented null, inconvertable values (data type mismatch) etc. I want to validate the excel file before the upload and want to tell the user which row and column has got the error... Any idea as to how to accomplish this, without consuming much time and resources. Thanks

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• discovering files in the FileSystem, through SSIS

  - by cometbill

  I have a folder where files are going to be dropped for importing into my data warehouse. \\server\share\loading_area I have the following (inherited) code that uses xp_cmdshell shivers to call out to the command shell to run the DIR command and insert the resulting filenames into a table in SQL Server. I would like to 'go native' and reproduce this functionality in SSIS. Thanks in advance guys and girls. Here's the code USE MyDatabase GO declare @CMD varchar(500) declare @EXTRACT_PATH varchar(255) set @EXTRACT_PATH = '\\server\share\folder\' create table tmp_FILELIST([FILENUM] int identity(1,1), [FNAME] varchar(100), [FILE_STATUS] varchar(20) NULL CONSTRAINT [DF_FILELIST_FILE_STATUS] DEFAULT ('PENDING')) set @CMD = 'dir ' + @EXTRACT_PATH + '*.* /b /on' insert tmp_FILELIST([FNAME]) exec master..xp_cmdshell @CMD --remove the DOS reply when the folder is empty delete tmp_FILELIST where [FNAME] is null or [FNAME] = 'File Not Found' --Remove my administrative and default/common, files not for importing, such as readme.txt delete tmp_FILELIST where [FNAME] is null or [FNAME] = 'readme.txt'

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