How To Design A Chemical Database
Mar 6, 2011
I want to design a database of chemical material. As every body knows that the chemical material has more than 20 variety of features such as color, molecular weight,temperature,pressure,pH, etc. I learn that all of features was designed into description item in some database,but I think it is not an easy way to research. As a good SEO principle,I expect material can be searched by many items, could you tell me how i improve that design,
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Oct 21, 2015
I am having a label on web form which contains chemical formula, when I am exporting web form in pdf using iTextSharp it displaying like this :
<p>C<sub>32</sub>H<sub>16</sub>CuN<sub>8</sub></p>
I want to display like this in pdf C32H16CuN8
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
lblChemicalFormula.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
HTMLWorker htmlparser = new HTMLWorker(document);
[Code] ....
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Mar 18, 2010
I've just finished my database design and now i'm going to start implementing it in SQL Server 2008. Since i'm creating an ASP.NET Web Application i would like to use Membership Provider to manage user access to the application. In other projects (more simpler) i used Membership but always with its default parameters.
In this recent application i need to use custom user data for it to work properly.
So, what i would like to know is, how can i use my 'Users' table in my DB with .NET Membership Provider?
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Oct 7, 2010
how to design following small webproject and database .i am totally new in this area.
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Activities
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Transfer button. So when design is done we should be able to click the transfer button and move the job from Design to Procurement
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Jan 16, 2011
Im new to database design and I would like to know what is the best way to design a tagging system such as the one that stackoverflow has?
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Apr 24, 2010
I have a ordinary Category/Product database relationship Design structure.
Now i wish to add a sub category to this architecture.
for example, Cloths Category needs to be sub divided - Women,Men,Children categories.Also what about other Ctegories such as: Car,this also has sub divisions: Model,Type.
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How do you therefore incorporate this sub division into the existing Category/Product relationship model and is there a model example?
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Jan 30, 2010
In my web application I want to log certain user interactions etc, like "User ABC joined Group XYZ" Therefore I want to set up a logging mechanism that logs into a Mssql database. I'm now trying to find a good database design to achieve flexibility.
First of all, I don't want to log strings like "User ABC joined Group XYZ". I'd like to separate the content "ABC" and "XYZ" from the template. So I'm looking for a templated logging database.
Something like this:
table: UserLog
IDLog int primary key [code]......
I think this database structure would give me enough flexibility to add/remove/edit specific log types (like 'User ABC did something else'). For example I might want to add some information to a specific log entry for future entries. Therefore I create a new UserLogTemplate that references the same UserLogType. That is how I would achieve downward compatibility.
Is that a database design that will work?
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Jun 4, 2010
I am building a page that displays a product's details, with the information being called from an MSSQL database.I would like to be able to have a variable number of features listed for each product, so for example, Product A has a list of 3 features, Product B has a list of 7 features, Product C has 2 features listed etc.I would like to avoid having a lot of NULLS in my database, and would prefer not to restrict the number of possible features listed.Is there a common way to tackle this problem? Is it simply a case of setting up a table just to store features?
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Jul 18, 2011
I'm in the process of re-writing an existing survey application that is currently using nested repeater controls to display questions and answers. The application was not designed with future enhancements in mind and its a pain any time a new question has to be added to the application. The repeaters currently contain questions, answers, and controls(texbox, radiobuttonlist,etc.)
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Jan 17, 2010
I didn't really know where and how to put this so here we go:
I'm trying to design a map with co-ordinates that's driven from data in a database. I want it to look something like this:
Also, the selected X/Y co-ordinate must be centered for the user to see. How could I produce something like this?
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May 14, 2010
I'm looking to create a survey with a Radio Button List and a submit button and then I want to store the result in a database. Not sure how to do design the database columns or handle the click event to write the survey answer to a database.
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Jul 23, 2010
I designed SqlExpress database for online store ( Asp.net).And these is tables
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dep_Id (PK)
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Mar 19, 2010
for years now I have had a problem with trying to design the best database design for an internal email messaging system for a website.
I would have thought that this would be a fairly easy thing to think of at this point in my development history but it still eludes me to no end.
What irratates me even more is that I would think i could find something online giving more detail about it but i have yet to find the right search term to use
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Feb 15, 2011
i am making an application which is like chain system..i mean one person can have multiple child.. then his child can have multiple child ..etc like chain system...i dont know to insert into database.. so that when i call any-node.. his child,, and their futher child will show...
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Oct 8, 2013
How to design and bind the grid view.
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Jul 23, 2013
The user enter the name,address,country,qualifiction,experience the user enter more than one qualification, and experience the add another button click will add another qualification, and experience...i am confused in designing the database how to design the database for this . i am design this tables .
==employee table== ===Qualification== ==Experience===
employee_id qualificatin-id Experience_Id
employee_name University Company
employee_address Degree Year-of-0experience
employee_qualification End_Date employee-id
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Jul 15, 2013
i am developing a simple forum in which i want to add messaging activity like Facebook message.
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Mar 1, 2011
If I want to be able to have a table Consultant, which is the user and their personal information, and I want this user to be able to select their proficiency in a number of Programs (software) on a scale from 0-5 (zero being no experience whatsoever), how do I do this best?
I mean I could have a Consultant table with a one-to-many relationship to a Program table, and then have all the limited Programs availalbe loaded by an XML file or something, and for each Consultant associate all the Programs and their Levels of proficiency. But that seems very wrong and inefficient.
It seems to me I should have a table with all the (limited number of) Programs, and then by some sort of association between the two by Ids. But I can't get my head around how to do this. I'm thinking many-to-many... But first, is this correct? Secondly, how do I do this in an Entity Framework Model? I usually create my database code first, i.e. create the EF model, and then generate database from model. Will I get a junction table where I can add the Level field, because basically a Consultant HAS A Program with a Level, or actually a list of Programs each with a Level.
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Feb 10, 2010
I am in the process of redesigning our main product, a knowledge database system for clients to access clinical and specialist advice articles. There is a requirement to add "Social Networking" to this allowing users to connect and post remarks etc...
This is somewhat similar to the Facebook wall scenario - where Articles, Photos, Groups, Products, Events, ActivityFeed can all have comments. I am at a lose as to the database design I would need to implement this. All comments must allow for Moderation/Approval/Spam Reporting etc...
I originally thought a individual table for each Comments entity ex: ArticleComment, ProductComment would work as the comments themselves are not all directly related. Each table having the same exact columns. But this makes life abit awkward as then this creates a separation between something that for all purposes is the same i.e. They are all comments.
The other design idea was to have a single Comment table with an "arc" type relationship to related tables with FK references back to the source.
The other option was to have a single Comment table with an Object Type and XID but this breaks the rules of relation and does not all for referential integrity.
I am at a lose and don't know what to do. I have asked over at SQLCentral.com and all I have done is raised more questions than answers about what to do.
Design 1: This would require exact copies of this table for all the entities.
-- Photo Comments --
CREATE TABLE dbo.PhotoComment
(
CommentID int IDENTITY(1,1) NOT NULL,
PhotoID int NOT NULL,
Body ntext NOT NULL,
ReportedAsSpam bit NOT NULL CONSTRAINT [DF_PhotoComment_ReportedAsSpam] DEFAULT (0),
IsSpam bit NOT NULL CONSTRAINT [DF_PhotoComment_IsSpam] DEFAULT (0),
IsApproved bit NOT NULL CONSTRAINT [DF_PhotoComment_IsApproved] DEFAULT (1),
CreatedDate datetime NOT NULL,
CreatedBy uniqueidentifier NOT NULL,
UpdatedDate datetime NOT NULL,
UpdatedBy uniqueidentifier NOT NULL,
IsDeleted bit NOT NULL CONSTRAINT [DF_PhotoComment_IsDeleted] DEFAULT (0),
CONSTRAINT [PK_PhotoComment] PRIMARY KEY (CommentID),
CONSTRAINT [FK_PhotoComment_PhotoID] FOREIGN KEY (PhotoID) REFERENCES dbo.Photo(PhotoID),
CONSTRAINT [FK_PhotoComment_CreatedBy] FOREIGN KEY (CreatedBy) REFERENCES dbo.aspnet_Users(UserId),
CONSTRAINT [FK_PhotoComment_UpdatedBy] FOREIGN KEY (UpdatedBy) REFERENCES dbo.aspnet_Users(UserId)
)
Design 2: The "Arc" relationship
CREATE TABLE dbo.Comment
(
CommentID int IDENTITY(1,1) NOT NULL,
CommentType char(1) NOT NULL CHECK(CommentType IN ('A','I','E','G','U','P')),
Body ntext NOT NULL,
ReportedAsSpam bit NOT NULL CONSTRAINT [DF_Comment_ReportedAsSpam] DEFAULT (0),
IsSpam bit NOT NULL CONSTRAINT [DF_Comment_IsSpam] DEFAULT (0),
IsApproved bit NOT NULL CONSTRAINT [DF_Comment_IsApproved] DEFAULT (1),
CreatedDate datetime NOT NULL,
CreatedBy uniqueidentifier NOT NULL,
UpdatedDate datetime NOT NULL,
UpdatedBy uniqueidentifier NOT NULL,
IsDeleted bit NOT NULL CONSTRAINT [DF_Comment_IsDeleted] DEFAULT (0),
CONSTRAINT [PK_Comment] PRIMARY KEY (CommentID),
CONSTRAINT [FK_Comment_CreatedBy] FOREIGN KEY (CreatedBy) REFERENCES dbo.aspnet_Users(UserId),
CONSTRAINT [FK_Comment_UpdatedBy] FOREIGN KEY (UpdatedBy) REFERENCES dbo.aspnet_Users(UserId),
CONSTRAINT [UC_Comment_CommentID_CommentType] UNIQUE (CommentID, CommentType)
)
-- Article Comments --
CREATE TABLE dbo.ArticleComment
(
ArticleID int NOT NULL,
CommentID int NOT NULL,
CommentType char(1) CONSTRAINT [DF_ArticleComment_CommentType] DEFAULT 'A', CHECK (CommentType = 'A'),
CONSTRAINT [PK_ArticleComment] PRIMARY KEY CLUSTERED (ArticleID, CommentID),
CONSTRAINT [FK_ArticleComment_ArticleID] FOREIGN KEY (ArticleID) REFERENCES dbo.Article(ArticleID),
CONSTRAINT [FK_ArticleComment_CommentID] FOREIGN KEY (CommentID) REFERENCES dbo.Comment(CommentID),
CONSTRAINT [FK_ArticleComment_CommentID_CommentType] FOREIGN KEY (CommentID, CommentType) REFERENCES dbo.Comment(CommentID, CommentType)
)
Design 3: The one that breaks the rules
CREATE TABLE dbo.Comment
(
CommentID int IDENTITY(1,1) NOT NULL,
ObjectType char(1) NOT NULL, /* A = Article, P = Photo etc... */
XID int NOT NULL, /* Would be the ID of the main entity being queried. */
Body ntext NOT NULL,
ReportedAsSpam bit NOT NULL CONSTRAINT [DF_Comment_ReportedAsSpam] DEFAULT (0),
IsSpam bit NOT NULL CONSTRAINT [DF_Comment_IsSpam] DEFAULT (0),
IsApproved bit NOT NULL CONSTRAINT [DF_Comment_IsApproved] DEFAULT (1),
CreatedDate datetime NOT NULL,
CreatedBy uniqueidentifier NOT NULL,
UpdatedDate datetime NOT NULL,
UpdatedBy uniqueidentifier NOT NULL,
IsDeleted bit NOT NULL CONSTRAINT [DF_Comment_IsDeleted] DEFAULT (0),
CONSTRAINT [PK_Comment] PRIMARY KEY (CommentID),
CONSTRAINT [FK_Comment_CreatedBy] FOREIGN KEY (CreatedBy) REFERENCES dbo.aspnet_Users(UserId),
CONSTRAINT [FK_Comment_UpdatedBy] FOREIGN KEY (UpdatedBy) REFERENCES dbo.aspnet_Users(UserId),
CONSTRAINT [UC_Comment_CommentID_ObjectType_XID] UNIQUE (CommentID, ObjectType, XID)
)
-- Ex: Get all comments for article ID 23.
SELECT * FROM Comment Where ObjectType ='A' and XID = '23'
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Dec 11, 2010
If I store the data every second, the database will grow rapidly. I need to have less detail of measurements of a few weeks/months back. An average would be enough. I have 5 sensors: wind speed, wind direction, temperature, light and rain. How would I design my database?
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May 5, 2010
I want to create a LINQ DataContext Class as per Database Design. I getting a problem in some cases.
the syntax to bulid a LINQ class :
[Code]....
Here Table Name Is HardCoded But I my case my Table Name A Changed as Finicial Year Change.So How I Give The TableName As RunTime
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Mar 5, 2010
I have the attached database design.
The database has been designed for a tradesman web site, i.e. Plumbers, Builders etc. The two main tables are tblCustomer and tblTrader which will stored data from two frontend web pages where the customer and trader can enter their personal details. After a customer enters their personal details (i.e. registers through the site) they will then be directed to a child page where they can progress to entering a specific job attached to a specific trade (i.e. Plumber) and trade type (i.e. Bathroom Installation), once a customer job has been entered I want these details to be emailed to all the trader_email addresses from tblTrader, from this email alert the traders will then enter the system and offer quotes to the customer through tblTraderQuote where the customer will then accept the best quote for them.
What I also want to implement is some sort of rating option that will allow the customer to rate their trader, either something like ebay's feedback or just a simple 1-5 rating option? How can I implement this into my database design or is this something that should be performed within the programming layer?
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Nov 12, 2010
In our application, we store the most number of users online. We do this by tracking what page each user is on currently and upon login, delete users who have been inactive for X minutes and then take a count of the users online, overwriting the most number online if this is higher.
How can we change this to track the number of users online over a time period, so we can look at a line graph of the number of users online. I guess we'll need a cron to run every 1/2/5/10/20/30/60 minutes to track the number online? Then how would be store this data, the table would get very large. I would think the likes of Statcounter/Analytics would have a better way of storing this data.
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Sep 28, 2010
I am working on a multi-lingual application Assume the following:
Database has 50 tables and application has to support 5 languages
Which is the best way to design the database:
1. Include a langugae column for each table. Repeat the values for each language. Say i have a country table which has 100 countries in it. Then my design will contain 500 rows (100 for each langugae)
2. Create a separate table which will contain the translations for all the 50 tables in with a foreign key to the parent table.
Which is more efficient out of the above two.
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May 14, 2010
everytime I modify an SQLdatasource using VS wizards, I have to dettach the mdf in VS's server exporer, then hit refresh in the browser, then get the applicaiton is offline error message please remove some pia file, but i usually just count to 12 and then hit refresh again and the page renders properlyhad scoured the forum on more than one ocasstiion, think it has something to do with the Admin rights within SQL, Ive tried the SQL server surface configuration tool, and add administrator stuff, but not sure if i should add (user to provision) something like the asp.net thing, or network services or ??also cant figure out where to view which administrators are actually on SQL server,
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