convert sql to linq online

database objects, or database objects that cannot be used in the program (such as log tables and batch operation tables ), it is completely unnecessary to make these objects consume memory space and the DataContext Object Tracking Service. We recommend that you distribute all database objects to several DataContext instances based on the unit of work. You can also configure the DataContext using the same database connection through the constructor, which can also be used by the database connect

objects, or database objects that cannot be used in the program (such as log tables and batch operation tables ), it is completely unnecessary to make these objects consume memory space and the datacontext Object Tracking Service.We recommend that you distribute all database objects to several datacontext instances based on the unit of work. You can also configure the datacontext using the same database connection through the constructor, which can also be used by the database connection pool.

Both LINQ and LINQ to SQL are no longer a new thing, but I was too late to come into contact with this series. I decided to write this series with an attitude that I knew it was necessary. The test environment used in this article is vs 2010, and the SQL Server 2005 database. 1. Starting from cud, how to inse

The previous article described LINQ, and by the way, the where operation, this begins with the LINQ to SQL statement, which allows you to understand from a statement's perspective that Linq,linq includes LINQ to Objects,

, or implement an interface . I want to write a query using LINQ . I want to use Orm, but it requires excellent performance, performance can be optimized through stored procedures and compiled queries. the main application scenarios of LINQ to entities are scenarios that require flexible and more complex ing, especially for enterprise applications, access to other database systems is also required. In thes

Once an object is loaded into the memory, it is very easy to insert a new order. It is nothing more than creating an order class instance and adding it to the orders set of the customer object. LINQ-to-SQL will track changes in the data context and send those changes back to the database when the submitchanges of the data context object is called. The following example shows a data change process: String i

[Linq To SQL] solves Collation conflicts during join operations. Background Now two tables A: B: If you try the join operation, an error is returned: Analysis Because the sorting rules of the two table fields are different, the table cannot be compared during connection, and an exception is thrown. If you use an SQL statement, you only need to specify Colla

Method 1. Official example As we all know, it is also a method that many opponents of the LINQ to SQL think is inefficient. NorthwinddatacontextDB =NewNorthwinddatacontext();VaRCustomers = dB. Customers. Where (C => C. customerid. startswith ("Bl"));Foreach(VaRCustomerInCustomers) {customer. Address ="Guangzhou"; Customer. contactname ="Coolcode"; Customer. companyName ="Microsoft";} DB. submitchanges ()

Once an object is loaded into the memory, it is very easy to insert a new Order. It is nothing more than creating an Order class instance and adding it to the Orders set of the customer object. Linq-to-SQL will track changes in the data context and send those changes back to the database when the SubmitChanges of the data context object is called. The following example shows a data change process:String id

Selectnames in LINQ to SQL First, let's look at the definition of selectmany: Selectmany method in queryable: project each element of the sequence to an ienumerable When writing a query statement using LINQ to SQL, there is a selectmany statement, which indicates a one-to-many relationship.ArticleI would like to

may also think about this. Add a filter condition "Nothing more" to add a parameter to the interface, a parameter to the stored procedure, and a condition to the WHERE clause ,...... Working hard. The customer's filtering condition is as follows: since the order contains the "country" field, you want to filter the condition according to the country, and you can select multiple countries, for example: The engineer may fall down when he sees the figure ...... The above can be used as a j

Spring Festival is relatively idle. I just learned a little about linq to SQL and plan to become a small financial system. Coolite is used on the interface. The user experience is good. I only saw the effect. I just downloaded the control and didn't know it at all. Just learn it. The system is used by layers, and it must be put in place on the surface. I directly use the code generated by

Just a little bit of Linq was attracted by it, and I suddenly came up with the idea of learning and using it in one breath. So I posted a video on the ASP. NET official website. I am not very good at English, but I can understand how to use it. Below I wrote a little bit of fur I learned. It is a learning record. First, I use Visual Studio 2008 development tools and SQL Server data sources, which are writte

filter condition "Nothing more" to add a parameter to the interface, a parameter to the stored procedure, and a condition to the WHERE clause ,...... Working hard. The customer's filtering condition is as follows: since the order contains the "country" field, you want to filter the condition according to the country, and you can select multiple countries, for example: The engineer may fall down when he sees the figure ...... The above can be used as a joke, but in other words, there is no uni

Label:ORM "Object Relation Mapping" Linq to SQL: First, build the LINQ to SQL class:Understanding Context Classes: Linq to SQL class name +context each table in the database can be accessed using a context class; Classification Ap

Label:ORM "Object Relation Mapping" Linq to SQL: First, build the LINQ to SQL class:Understanding Context Classes: Linq to SQL class name +context each table in the database can be accessed using a context class; Classification Ap

Author: barefoot thinkingTime: 8/30/2010 5:04:58 The database access technology is generally used to study databases. It may be more about northwind. Haha! At least, I often make such a sample database. Even so, the understanding of this database is quite superficial. Or, I think it is not necessary to thoroughly read this database. ^_^ I'm afraid it's because of this superficial understanding that at last such a code was generated!The purpose of this Code is to study the many-to-many ing relati

of the database. 4: 5: * / 6: new Shifenzheng (@ "Data source=chao-computer\mssqlserver_r2;i Nitial Catalog=shifenzheng; User Id=sa; password=123123123; "); 7: 8: public frmmain () 9: { Ten: InitializeComponent (); One : } : : privatevoid Sbsearch_click (object sender, EventArgs e) : { : : string strName = TeName.Text.Trim (); : if (strname.length==0)

Datacontext, as the main entry point of the LINQ to SQL framework, provides some methods and attributes for us. This article uses several examples to illustrate typical applications of datacontext. Create and delete Databases The createdatabase method is used to create a database on the server.The deletedatabase method is used to delete the database identified by the datacontext connection string. The data

a generic collection of type fruit { returnContext.Fruit.ToList ();//Convert the result to a generic collection using the ToList function } PublicListstringName//Fuzzy Query { returnContext.Fruit.Where (r=>r.name.contains (Name)). ToList (); //See if the filtered line has a name like name, with a contains package that does not contain the defined lower case, and then converts to a generic