I would like to know if the forieng key should be nullable or not. We shuld struggle for not making it nullable as much as possible or it doenst matter.
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View 2 RepliesWe have an application that has quite an extensive APP_Code directory (about 150 functions). The functions are split across multiple files and then classes and namespaces.
On numerous pages we have to create numerous instances of the classes to be able to access the functionality, which can get very repetitive and means we're repeating code on every page declaring the instance etc.
As far as I can tell, a way to navigate this issue, is to make the functions Public Shared (as opposed to just Public functions).
I haven't used the application variables in my asp.net web applications. Im using asp.net2.0. Is there any disadvantages of using applicationvariables.
View 1 RepliesI am searching for the advantages and disadvantages of the explicit interface implementation
View 1 Replieswhat are the advantages/disadvantages of dataset and databinding?
View 3 RepliesI have 2 table Table A, Table B.
Table A - Parent Table
ID - Uniqueidentifier not null(PK)
Table B -Child Table
ID - uniqueidentifier null(FK, TableA)
I have a stored procedure to insert data into Table B, but when I tried to insert a null value into column ID of table B, this error came up:
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_tableB_tableA". The conflict occurred in database "database name", table "table A", column 'ID'.
The statement has been terminated.
The insert statement in asp.net is like so:
sqlcommand.parameter.add(New Sqlparameter("ID", Nothing))
I am guessing adding nothing to the null value column is the problem, but i don't know how to fix it... The INSERT statement conflicted with the FOREIGN KEY constraint "FK_tableB_tableA". The conflict occurred in database "database name", table "table A", column 'ID'.
I have two table BuildGroup and table DocumentTemplate. DocumentTemplate table has BuildGroupId as foreign key which is nullable. In a certain senario I update BuildGroupId in DocumentTemplate table.
[Code].....
In another senario I need to set BuildGroupId in DocumentTemplate table again to dbnull.value. I tried with different cases as in else block. It giving the error : Cannot implicitly convert type 'System.DBNull' to 'int'. How can I update a foreign key value with NULL?
This must be a common problem but I haven't been able to find an answer.I have dropdownlist that maps from a SQL foreign key, which can be NULL. Currently, I've added a "Please select..." to the top of my dropdown list and assigned it a value of 0.I know how to map from the drop down list to SQL using a CASE statement in my UpdateCommand.But how to I map from the SELECT statement to my dropdownlist? If this foreign key contains null I get "Item not in Dropdown list". I'd like to show "Please Select..." as the dropdownlist item if the SQL item contains NULL. I saw something online that says to use the value '''' for 'Please select...', but I don't think it's right, plus it doesn't work.Do I have to do something in my SELECT statement or do I have to do something on DDL.Databind?
View 2 RepliesThis is my UserRoleList.aspx.cs Code where i am passing the session variable to the page Default.aspx.cs..
And the error is: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints. I have gone through many pages , and tried by making the AllowDbNull property making True and then different things.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
[code]...
This is the code of the second page Default.aspx.cs where i have to user the session varaible to pass in the SQL fucntion named GetDataByUserId as shown below:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
[Code] ....
I am trying to create a stored procedure where I can insert null values in columns that have a foreign key constraint and allow nulls. The columns I am trying to insert nulls into are commentid and imageid. I have created an Insert statement in a stored procedure and I get the foreign key constraint error. Can you tell me how to allow inserting data in the other columns without having to insert anything in the commendid and the imageid?
Here is my exec of the stored procedure that is not working:
[Code]....
[Code]....
I have a Sql Data Source that queries my class database. What I'm trying to do to save myself some landscape is to check a checkbox if any of the pre-requisite fields are not empty. I have this laying inside a gridview. My code doesn't error out but it doesnt' do anything either.
[Code]....
My query is like this:
[Code]....
So in a nutshell, if there is any value in PR1 - PR7, I want to check my checkbox in the gridview.
I have gridviwe having 2 columns:
1) DocNumber 2)Title
query select docnumber,title from tbl_docs.
BindwithGridviwe(sql);
Now the issue is that that every document doesn't has document number. I want to make invisible the docuNumber column of the grid viwe if all values in the docNumber retrieved are null.for example:
docnumber tite
null Document 1
null Document 2
null doucment 3
null document 4
if returned result match above where all docnumber are null then make the gridviwe docnumber column ivisible eslemake the greidviwe column visible.
1 - Is it necessary to have foreign key to obtain a Relation in Entity Framework between each entity.?
2 - I have a Language Table and many many table with a foreign key related to the language table. Is it right to add this foreign key or I should do something else ?
Ex:
Language
LangID
LangName
TableTextA
TblAID
TextInfo
LangID
TableTextB
TblBID
TextInfo
LangID
TableTextC
TblCID
TextInfo
LangID
etc ...
I need help making selections on my installation of SQL Server 2005 Developer Edition onto my Laptop (the only computer in my house). I need to develop a couple of different databases and use them from my Visual Studio applications. Then I will upload the SQL databases and the Web Applications to GoDaddy for deployment to general public.My question is that installation is asking me questions I honestly don't know how to answer because I am using a different SQL this time around after reformatting my hard drive"
1. Do I use Default or Named Instance?2. Do I use the Built-In System account or a Domain User account?3. If answer 2 is Domain User then I am in trouble because I don't think I have a Domain, and I don't know what one is. Where would I find the user name, the password, and the domain?
In my databse i have a databse tables
UserRole -UserID,UserName,RoleName.
Compaign - CompaignId,Region,CompaignName,LOB.
Employee -EmpNo,EmpName,CompignId
Timesheet -TimeId,EmpNo,Date.
I dont have primary key for Compaign Table CompaignId is Identity column. Now i want to use CompaignId in Employee Table because based on compaign user will retrieve employee data in Front end. Again Employee table doesn't have primary key. I am uploading excel file data to databse but in excel file there is no empNo so i cannot use primaryKey i have EmpName in excel file. How to solve this issue. How to use master table if possible create table structure for my requirements.
I have two tables, which is table 'A' and table 'B'. Table B contains a foreign key that is referenced to table 'A'. The question now is, could I used an option in my project in visual studio an 'Others specify'? I believed that it's not possible, isn't it?If I have a selection that is bound to a datasource then is it possible to make an option 'Others specify' without adding the specified value to the database, which in turn would not have a unique ID? Table B contains the table A ID PK field, and all values from table A to table B should contain a unique ID.
View 2 Repliesi am using the following in a stored procedure.
[code]....
[Code]....Handling NULL...Field not updating when NULL?
I am new to sql. I got this task to design a table in sql. It has for columns user_ID(PK, FK1) , WebSite_ID (PK, FK2), Create_Dt, Update_Dt How do I create PK and Fk1 and PK FK2 in sql server 2008 R2
View 3 RepliesI need ms sql video, in which i can learn how to set primary and foreign key.. why it useful and how it works...
View 3 Repliesi need to delete some but i am using emp_id primary key in one table and using emp_id foreign key another one table.. now i wanna delete emp_id .. but i cant delete the row .. displaying error message .. how to delete the rows...
View 1 RepliesI have four tables namely tblStudent, tblParent, tblEmployee and tblUnwantedVisitor.
tblUnwantedVisitor should get the primary key from the three tables, which is the visitor ID, tblStudent visitor ID starts from 10000, tblEmployee from 20000 and tblEmployee from 30000.
I used foreign key from one to one table only, so I don't know if my approach for the database is wrong or foreign key for multiple tables, which is somehow unlikely, is necessary.
i am using sql server 2005 as backend for developing webforms with asp.net using C#.i have two tables table1 and table2.
table1 has user_id(primary key,not null),user_name. and table2 has dept_id(primary key,not null),user_id(foreign key,not null),dept_location.
Firstly i created table1 and insert data in it.. later i created table2 with foreign key relationship with table1..In the add form design of table2 for entering data and insert into table2,i placed a dropdownlist which is binded with user_id from table1...dropdownlist's.datatextfield is equal to "user_name" and datavaluefield is equal to "user_id"..i have to select user_name from dropdownlist.... what i have to do is to insert data into table2... i used the simple sql insert statement as follows..
insert into table2 values(......); but it shows error :insert statement conflicted with the foreign key.
I have 2 tables Order and Order_Detailrder_dtl_id is the primary key Order_id is the foreign key that referrence Order_Id in Order Table
View 4 Replies