?
Solved

Linq to SQL Query for multiple rows

Posted on 2008-11-01
6
Medium Priority
?
2,420 Views
Last Modified: 2013-12-17
Hello,

We have this data entry page where user enters data for the following fields

BookName
ex. asp.net programming

ISBN
ex. 12345

Authors (enter comma seperated)
author1, author2, author3


When the page is submitted, we want the above data to be stored in two tables

table1 - bookmaster
columns - bookid (identity), bookname, isbn
ex.  234, asp.net programming, 12345

table2 - bookauthors
columns - id (identity), bookid, authorname
ex.
1, 234, author1
2, 234, author2
3, 234, author3


Please let me know how to write the query for the above in Linq to SQL (C#).
Note. User enters authors name comma seperated.

Thanks in advance.

0
Comment
Question by:sunseshasai
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
6 Comments
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 22859110
Hi sunseshasai;

What is the structure of the tables in the database?

Fernando
0
 

Author Comment

by:sunseshasai
ID: 22859522
Hello FernandoSoto:
Here it is,

CREATE TABLE [dbo].[BookMaster](
      [BookID] [int] NOT NULL,
      [BookName] [varchar](100) NOT NULL,
      [ISBN] [varchar](50) NULL,
 CONSTRAINT [PK_BookMaster] PRIMARY KEY CLUSTERED
(
      [BookID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]


CREATE TABLE [dbo].[BookAuthors](
      [ID] [int] IDENTITY(1,1) NOT NULL,
      [BookID] [int] NOT NULL,
      [AuthorName] [varchar](100) NOT NULL,
 CONSTRAINT [PK_BookAuthors] PRIMARY KEY CLUSTERED
(
      [ID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]


ALTER TABLE [dbo].[BookAuthors]  WITH CHECK ADD  CONSTRAINT [FK_BookAuthors_BookMaster] FOREIGN KEY([BookID])
REFERENCES [dbo].[BookMaster] ([BookID])
0
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 1000 total points
ID: 22860413
Hi sunseshasai;

This will do what you need.

Fernando

using System.Data.Linq;
 
 
// Instantiate the DataContext
BooksDataContext bookDB = new BooksDataContext();
// Get the BookMaster table which has a link to Authors
Table<BookMaster> books = bookDB.GetTable<BookMaster>();
// Separate the authors on the comma
String[] authors = txtAuthors.Text.Split(',');
// Instantiate a new book to be inserted
BookMaster newBook = new BookMaster();
// Fill in the fields of the BookMaster table using text boxes, can be any string variable
newBook.BookName = txtBookName.Text.Trim();
newBook.ISBN = txtISBN.Text.Trim();
// Create a Author record for each author and add it to the Entity Set of the newBook
foreach (String author in authors)
{               
    BookAuthors bAuthor = new BookAuthors();
    bAuthor.AuthorName = author.Trim();
    newBook.BookAuthors.Add(bAuthor);
}
// Insert book and authors into the table and submit on changes
books.InsertOnSubmit(newBook);
// Submit changes to the database
bookDB.SubmitChanges();

Open in new window

0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 22868089
Did this answer your question?
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

IP addresses can be stored in a database in any of several ways.  These ways may vary based on the volume of the data.  I was dealing with quite a large amount of data for user authentication purpose, and needed a way to minimize the storage.   …
More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
Suggested Courses

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question