Basic Foreign Key Question (Asp.net)
Feb 12, 2008
I have a very basic question on SQL Server foreign keys and ASP.NET. I have a Projects table represented by a FormView, and I have ProjectTasks table that is represented by a GridView nested in the formview. The ProjectTasks table has a Project_ID column which has a foreign key constraint (the Project_ID must exist in the Projects table). I started by setting up the EditItemTemplate of the FormView, and as a result, when editing a record in the Projects table, the Project_ID is already known making it possible to edit or add ProjectTasks via the nested GridView.
Here is my question. If I want to add a new Project, I will start with a blank form and will fill out the fields. The Project_ID (a Primary Key in the Projects table) will be automatically generated for me when I add the record. Prior to clicking the Add button, I would like to be able to fill out the ProjectTasks GridView, even though I don't have a Project_ID yet to use in my ProjectTasks records. Should I store the ProjectTasks in a temporary table without a foreign key constraint and then copy them to the proper table once I have a Project_ID?
Thanks for the help!
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Mar 29, 2008
Hi, I am new to SQL. I am trying to set a foreign key relationship within the same table, but when I drag the relationship to the same table I get the error, "The ALTER TABLE statement conflicted with the FOREIGN KEY SAME TABLE constraint." What would be the cause of this?
Thanks.
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Nov 19, 2007
Let's say you have a Users table, which simply contains a collection of people. Each person has attributes like their password, first and last name, username, etc. It would be useful to track changes to that table over time, so that if an entry is changed, you can simply look at a history table and see which changes occured, and when.
An INSERT/UPDATE trigger works well for this sort of thing, where the trigger inserts all of the 'INSERTED' values into a history table that has basically the same table definition as the Users table. But it gets tricky when considering Deletes.
If my History table entries reference back to the User in the Users table, this means that if I ever want to delete the user, I need to delete all their History first. This means I can't keep records of user deletions, which is significant. The other approach is not to have a foreign key reference in the History table, so that if a user is deleted, I can still keep my History about that user. Including deletes.
I have been timid about doing it this way, since I felt it broke the idea of a well structured database. Is there a better way to approach this? Is there a standard way to set up triggered history to track changes, including deletions, from a table?
Thanks,
-Dan
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Mar 18, 2005
This is probably a very silly question.I started learning ASP.net by following ASP.NET Unleashed. I am stuck where he wants me to open a connection to SQL Server database. I have just downloaded
MSDE. But I dont know where to type this code and how to run it..so as to connect to the database.
<%@ Import Namespace="System.Data.SqlClient" %>
<Script Runat="Server">
Sub Page_Load
Dim conPubs As SqlConnection
conPubs = New SqlConnection( "server=localhost;uid=webuser;pwd=secret;database=pubs" )
conPubs.Open()
End Sub
</Script>
Connection Opened!
Now do i have to change the uid to SA ? (i had to assign one when i downloaded and installed MSDE?
Thanks for the help.
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Nov 16, 2005
Hi all,
am not very experienced in using DTS and really need your help. I have a dts package that i have scheduled to run every day. Here's what i want the package to do:
1. Check whether a value for a certain column in a certain row of a table in my database is 0 or 1. If it is 1, then
2. Run the dts task (which i have created and is working)
In other words, when the package is started, i want to execute a stored procedure or sql task or whatever, and if that returns 1 then i want to continue, if it returns 0 i want to finish the package without running the dts task. I'm sure there's a simple way to do this, but i could use your help...!
Thanks,
Elisabet
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Jul 11, 2007
Hi All,
Can this be done and if so can you give a bullet list of the steps need to accomplish this.
I need to load a bunch of files into a stagging table. Need to loop through the files and load them.
Thanks,
Michael
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Mar 12, 2008
Hi,
what this statement do?
does it add all the values or combine all the values.
REPLACE combine WITH lc_tran + lc_exp + lc_war + ll_boc
Regards
kk
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Feb 19, 2007
I downloaded SQLExpress and Visual Studio Express to my home computer.
I built a simple database, adding data through theSQLexpress admin tool.
I built a web page using MS Studio. I connected to the database and used the webpage for a few days. Then I restarted the computer. Now the web page won't open, and MS Studio won't open the MDF file in the App_Data folder.
I can still see and work in the database through SQL server Express.
The web page and the MSStudio attempt to connect to the mdf file both fail with this message:
Cannot open user default database. Login failed.Login failed for user 'KAAAK/Administrator'.
So it seems to be trying to connect as the Windows user.
When I try to modify the connection to connect through a user/password I created in SQL manager, I get a message that the user is not a trusted SQL user.
from web.config:
<connectionStrings>
<add name="ConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|info.mdf;Integrated Security=True;User Instance=True;User ID=Admin;Password=12345" providerName="System.Data.SqlClient"/>
</connectionStrings>
That was changed from the original string created automatically by MS Studio
<connectionStrings>
<add name="stocksConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|stocks.mdf;Integrated Security=True;User Instance=True;" providerName="System.Data.SqlClient"/>
</connectionStrings>
I am sure this is some simple problem, but why would the system refuse to access an mdf file it had already been accessing.?
Thanks, Michael
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Mar 5, 2007
Hi all, having trouble with my first sql communication. I've got hosted service with an SQL database i've populated with a row.
When it gets to the third line the page crashes with an error.
SqlConnection connection = new SqlConnection("Server=mydbserver.com;Database=db198704784;");// +"Integrated Security=True"); SqlCommand cmd = new SqlCommand("SELECT UserName FROM Users",connection); SqlDataReader reader = cmd.ExecuteReader();
is there somewhere i need to put in my username or password? or is this code just wrong
Many thanks burnside.
-- Edited by longhorn2005
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Jun 8, 2007
not sure why I am having trouble here but I am using the following WHERE clause expecting to find all rows where any one of the the three keywords are present.
....WHERE Company.L_Keywords LIKE '%metal%' AND Company.L_Keywords LIKE '%tile%' AND Company.L_Keywords LIKE '%ceramic%'
however it appears to finding only the rows where all three words are present in the L_Keywords field
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Jul 25, 2007
This is a very simple question. How would a select satement be formated in the following example.
SELECT Grade, Student_ID, First_Name, Last_Name FROM Scores WHERE (This is where I'm stuck and I know this is not the right formatting although I wish it were because it would make my life a little bit easier.) Student_ID = 115485, 115856, 568547, 965864, etc...
I may have up to 100 specific student ids to put in this one statement. I know I can use the "WHERE Student_ID = 115485 OR Student_ID = 115856, OR Student_ID = 568547" but that would be alot of waste. Seems like there should be an easier way than using the "OR Student_ID =" for every entry.
Can someone explain another way I can do this. Thanks in advance.
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Jan 28, 2008
Hey, I have a pretty simple question.My query is throwing an error saying "Invalid column name 'subject'."The problem is that subject is a custom column I've made, well just look at the sql:SELECT a.ArticleID, subject=ISNULL((select subject from subjects),'') where subject='some subject'
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May 15, 2001
I have already created package which loads a text file to database using the dts wizard in Enterprise Manager.How do I execute that package using visual basic?Please provide the Code!!!Thanks
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Apr 25, 2000
Hello,
I've just migrated my access database from access2000 to sql7.0. The wizard told me there was no problem. But a simple question:
How do i open my database? Where can i see tables, fields...?
Is there no interface like the one in access2000?
Thanks in advance!
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Dec 6, 2004
Hi there.
I am trying to use MDX code to create a measure in ProClarity. Please help!!
A store can be one of a number of ‘Brands’. The MDX segment below gives me the Sales Value of a selected item, but for Store Brand 'Brand1' only. This works fine - but how do I add a brand? That is, how do I see the combined Sales Value for the selected item for 'Brand1' and 'Brand2'?
([Store Brand].[Brand1],[Measures].[Sales Value],[Item].CurrentMember)
B
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Sep 15, 2005
Hoping someone could me with an ongoing indexing question that I have.
On my site, we have over the past 5 years developed what is emerging as a fairly complicated dbase structure, as features have been added to my site and relations have increased between different database tables, there has been a need to index fields in different ways, and in some instances field indexing has overlapped. For example we may have a table that has 5 fields (field1,field2,field3,field4,field5). A need to index field1 is requried because of a query that reads:
SELECT * From Table1 where field1=XXXXX
Additionally there may be a need to for another query that reads:
SELECT * From Table1 where field2=XXXXX
In this instance an index is placed on field2....
But, for example when there is the following query:
SELECT * From Table1 where field1=XXXXX and field2 = XXXXX
Is it necessary to set a new index on: field1,field2 ???
We have made the choice that yes, in fact there is...but now over time some of our tables have instances of single fields being indexed along with combinations of two single fields that have already been indexed, being indexed together. As tables have grown to over 1,000,000 records and having up to 15 or so indexes, we realize that the number of indexes maybe degrading performance. Also, indexes vary in type, e.g INT,BIGINT,Varchar fields... In the above instance, can we eliminate the multi-indexes and improve performance over all...?
On a second related question:
In the event that two tables are joined on a common field.
e.g. Select * from Table1,Table2 where Table1.field1=Table2.field1
Is it necessary to index both of these fields in tables: Table1 and Table2 ?
Hope someone can help, as we are looking to improve the efficiency of our tables as they continue to grow.
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Jan 19, 1999
I need help.
160821A network error was encountered while sending results to the front end. Check the SQL Server errorlog for more information.
I need help.
Our SQL Server is crashing. The Database is still recovering. I can not kill any Process when the Server crashed. I shoot down and restarted the server. Nothing to do. I can not access to the database. It is recovering. How long? I do not know. What can be the reason of the recovering? Nor the event log of Windows NT or the log files of the SQL SERVER can help me.
Here is a part of the log file
23216Arithmetic overflow error for type %s, value = %f.
10915There are more columns in the INSERT statement than values specified in the VALUES clause. The number of values in the VALUES clause must match the number of columns specified in the INSERT statement.
99/01/19 01:14:25.69 spid25 bufwait: timeout, BUF_IO, bp 0x1bba600, pg 0x11b50, stat 0x801000/0x6, obj 0x23494814, bpss 0x124a2a0
99/01/19 01:14:27.15 ods Error : 17824, Severity: 10, State: 0
99/01/19 01:14:27.15 ods Unable to write to ListenOn connection '.pipesqlquery', loginname 'sa', hostname 'myserver'.
99/01/19 01:14:27.15 ods OS Error : 232, The pipe is being closed.
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Oct 22, 2004
Anyone know any good Visual Basic .NET STep By Step books for an almost beginner.
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Jan 15, 2004
I have many views and views on these views. Is there anyone out there who might have a suggestion as to how I can keep them straight so that I won't lose track of what I made them for? I am starting to not remember why I made some, so I have to go back and try and remember. Any suggestion would be appreciated.
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May 5, 2004
Hi
A quick question:Can we disbale sa account in sql server 2000?
Rgds
Wilson
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May 5, 2004
Hi
How can we audit sysadmin accounts in SQL server?
Rgds
Wilson
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May 10, 2004
I have a new pc with xp on it,I have been coping data,files,projects,etc from my old pc onto my new over the network.
If I open Query Analyzer my databasese are there and it is all fine,but if I open ODBC I have no databases under System DSN.
How do I go about that,I have many databases and tables in it,is there a way I can refresh it or something,it would have to be something simple,right???
Thanks
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Aug 25, 2006
Hi, can somebody help me with some verification SQL commands that I need to run on an Oracle database?
In the Oracle table 'FEE', if the 'FEETYPE' column has a value of '3' for a record, then the 'PERCENTAMOUNT' column needs to be not null for that row - can somebody put this into a command for me so I can make lots like it?
another one I have is in the 'FEE' table, if the 'FEETYPE' column has a value of '1', the 'PERIOD' column needs to always have a value of '3' for that row - is there a command that can check the records that do/do not have this information?
Any halp is greatly appreciated :)
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Jun 12, 2007
I was just looking for opinions on the best place to pick up SQL skills. Community college course? Online courses? Grad school? I've finished undergrad, if that helps anyone have an idea of my current situation.
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Jun 21, 2007
Hi,
I have only been working with SQL for short time. My question is probably a basic one but I would appreciate the assistance!
The scenario is I have two different tables AVCfids (on ACC database)& AVCfids (on ACC.archive database). I am trying to write a command in SQL server agent (jobs) to transfer the data on a daily basis from AVCfids to ACC.archives. The script I have created but is not working is:
Database: ACC_archives
Select * into avcfids
from server.acc.dbo.avcfids
Any feedback would be welcomed.
Regards Jeff
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Sep 21, 2007
I have a basic query select * From and has a column RecordDate I do I check just records for the last 6 months.
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Oct 9, 2007
Hi,
I am totally new to sql server and have got a few doubts.I couldnt find it in earlier posts.Sorry if it is a repetition
*Can we get all the table names of a database by Query?
*How to create a similar copy of a table by using AS..does this work in sql server 2000?(tried but showing error)
*can we modify the column properties(like ensuring NOT NULL) after the table is created?
Thanks in advance
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Nov 20, 2007
I want to count the rows in two tables and then give a percentage as a result.
Something like:
SELECT Count(*) / (SELECT COUNT (*) FROM Table2) FROM Table1
Just not quite sure how to do this.
*Thanks*
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Feb 10, 2008
I'm in a Database class and am finding it very difficult to find any outside help. I'm sure this will appear to be very basic to those of you who work in the Database field, but your help will be greatly appreciated.
INVENTORY( SKU, Description, QUANTITYOnHand, QuantityOnOrder, Warehouse)
WAREHOUSE( Warehouse, Manager, SquareFeet)
From the two tables above we're suppose to:
1.Write an SQL statement to show the Warehouse and average QunatityOnHand of all items stored in a warehouse managed by 'Smith'. Use a subquery.
2.Write an SQL statement to show the Warehouse and average QunatityOnHand of all items stored in a warehouse managed by 'Smith'. Use a join.
This is what I came up with. Please give me some feedback:
SELECT Avg(QuantityOnHand)
FROM INVENTORY
WHERE WAREHOUSE IN
(SELECT WAREHOUSE
FROM MANAGER
WHERE Manager = ‘Smith’);
2.44)SELECTAvg(QuantityOnHand)
FROMINVENTORY, WAREHOUSE
WHEREManager = ‘Smith’
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Jul 23, 2005
Hello, folks.I have the following query that I run that pulls up the count of the number of orders of a product.SELECT Product, Count(Product) AS TotalFROM Orders_ViewGROUP BY Product, Year([DateOpened]), Month([DateOpened])HAVING (((Year([DateOpened]))=2004) AND ((Month([DateOpened]))=10))ORDER BY Product;This query is fine but the COUNT() function only coughs-up the non-zero results. How can I get this query to cough-up the zero counts as well for all products listed in the Product table?TIA...
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Apr 11, 2006
I've not touched SQL server programming since 1999. I have very littlememory of it and need some clarifications on some basic questions thatI could even use a book for. Until I get myself a good book, someoneplease help me with the answers:1) What are SQL functions and how are they different from storedprocedures? Do both of the programming objects not achieve the samething? What was the need of having one in addition to the other?2) How do we use an "if construct"/if clause within a SQL statement?Can we use conditional checking with the if construct within a storedprocedure? Can you please post a trivial example of a stored procedurewith an if clause?3) Stored procedures can have input parameters as well as outputparameters. Can they also have in/out parameters that are like "byreference" parameters? What's the syntax on Microsoft's T-SQL version?4) How does one check the return value of a stored procedure?Thanks for helping out.
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Feb 13, 2007
Hi All,I am used to other SQL engines, and have a few basic questions--1)If I wanted to conditionally drop a table, does SQL Server have away to natively do this? Many SQL implementations will allowsomething like:CREATE OR REPLACE tablename ASSELECTx,y,zFROM sourcetable;Does SQL Server have something like this? This syntax, both the"create table as select" syntax and the "create or replace" syntaxseem to cause problems.2) Some of our existing queries have a keyword, "GO" where I wouldotherwise expect a semi-colon. Is there a functional differencebetween the two? I seem to be able to replace the "GO" keywords withsemi-colons without any changes in how the script behaves, but Ithought I would check and see if anyone has advice about thedifferences here.Thanks in advance,Ben
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Jun 8, 2007
Hi
Im am new to this stuff and I have a very basic beginner question.
I have started my first database, made some tables, some sql search ect. just to see how things works. Suddenly I am not able to connect to the "database engine". I don't get an error message. It just try to connect until I cancel the operation. (The only way I can cancel is by choosing "SQL Server Authentication". Then I get an error message as I would expect.)
I have tried to uninstall and reinstall, but with no succes.
Please help
Best regards Casper
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