ado net tutorial

. This means that many identical connections will be opened and closed repeatedly during application execution. To minimize the cost of opening a connection, ADO. NET is calledConnection Pool. The connection pool reduces the number of times new connections need to be opened.Pool ProcessMaintain the ownership of the physical connection. Manage connections by retaining a set of active connections for each giv

9-non-connection mode of ADO. NET, DataSet in memory, DataTable --- ShinePans, DataSet is called a DataSet. It can be compared to a database in memory. DataSet is ADO. NET core, supports ADO.. NET disconnected. The core object of

Original URL: http://jeffreyzhao1985.spaces.live.com/blog/cns! Fa6b435f09d91418! 1889. Entry recently used ADO. Net to operate access. There is a saying that the access function is enough to be used at will, so I also used it at will. It was suddenly plagued by a problem. It was very confusing how a stored procedure was executed incorrectly. Finally, we found that it was ...... If you use oledbconnection to

In the project, use unity as the IOC to concatenate the entire project and integrate WCF and ADO. NET Entity Framework, initially showed that unity could not construct the object. After being ruled out, it was found that ADO was used. the following exception occurs when the NET Entity Framework constructs the applicati

Coding implementation> Microsoft Data Access Technology ADO. Net> use dataset> learn more about Dataset Dataset is a memory database. dataset uses XML to represent data, not only copies of data in the database, but also imports records from XML and CSV files. Hierarchical relationship diagram of Dataset Coding> Microsoft Data Access Technology ADO.

I wantProgramEveryone knows the concept of dataset, but do you know the working principle and mechanism of ADO. Net dataset? I have collected a lot of information on the Internet and I have learned a little from my work. Let's take a look! For how the ADO. Net dataset works, see the figure below: the process

0 ,ArticleIntroduction Analysis of this ArticleAdo. netIs applicableAdo. netDevelopers who have a certain understanding. This is a basic template used to draw inferences from each other, divergent thinking, and sort out ideas, rather than a comprehensive detailed introduction, without sticking to details or in-depth analysis, and focusing only on the most common key points. BeginnerAdo. netDevelopers can also draw pictures and tigers.Visual StudioThe template can be imitated to make other a

. NET data provider object: 1. connection object2. Command object3. datareader object4. dataadapter object A general data object can store a local copy of the information in the database, so that the information can be processed when the database connection is disconnected. You can read rows in any order, search, sort, and filter rows in a flexible manner, or even change these rows, and then synchronize the changes to the database, it mainly includes

/datatable, this can also be updated and reversed. To disconnect a connection class: Datasets, DataTable, Datacolumn,datarow, DataView, DataRelation and constraint. The Disconnect class can access and manipulate the data provided by the connection class offline, and later synchronize with the underlying data source. DataSet A dataset is a disconnected relational database stored in memory (not related to the local), providing advanced browsing capabilities as a container for other

data streams, and more. These connection-based objects correspond to a specific data source. In other words, for different data sources, we need to find the corresponding database provider (data Provider) to match them. of course, you don't have to be confused and nervous about it, I've already made it very detailed in front of you. Perhaps, with what we have learned at the moment, there is nothing wrong with manipulating data sources and retrieving data. However, this does not give the advanta

I. Basic Knowledge When using ADO. NET to access data, there are two methods: 1. Use the Connection + Command + DataReader Method You can use the Datareader object of ADO. NET to retrieve data from the database. The retrieved data formsRead-OnlyThe data stream is stored in the client's network buffer. The read metho

This article summarizes some common program code for transaction processing in asp.net. The transaction processing is generally in the database, and the following instances are all basic database transaction processing, create a transaction processing object on the database connection, and then call the transaction processing object to submit the transaction or roll back the transaction. For more information, see. A transaction is a mechanism that ensures that multiple SQL statements are treated

================================== ADO. NET ================================== 1. Create a connection object Connection1. create a connection string: string constr = @ "Data Source =. \ SQLEXPRESS; Initial CataLog = ccdb; user id = sa; password = sa; "; view-server volunteer Manager-data connection-right-click-find name-Database password-advanced 2. connect to the database SqlConnection con = new SqlConnect

I often see people asking how to layer a project that uses ADO. NET Entity Framework or LINQ to SQL. EF or linq2sql generates an entity class by themselves. Since entity classes run through the entire project, if the automatically generated entity class is used as part of the entire project entity class, most classes in the project will be dependent on the data access layer. When the database structure chan

ADO. NET 5-delete a record using the Command object --- ShinePans, Source code: Using System; using System. collections. generic; using System. data; using System. data. sqlClient; using System. linq; using System. text; using System. threading. tasks; namespace SQLTest {class Program {static void Main (string [] args) {// connect to the database string connection = "server = Pan Shang \ SQLEXPRESS; datab

Using system;Using system. Collections. Generic;Using system. LINQ;Using system. text;Using system. Data. sqlclient;Using system. Data; Namespace ADO. net. addnewrow2{Class Program{Static void main (string [] ARGs){/// /// Check whether the same data exists when adding data. If yes, a prompt is displayed and data insertion is canceled./// Sqlconnection CNN = new sqlconnection (@ "Server = michaelyang \

The company held a year-end Technical Seminar, because the performance of NH was too low, the manager decided to conduct a test. Of course, testing should be reasonable, universal, and fair. NH must be slower than ADO. net. This is undeniable, but the degree to which it is slow and the difference must be measured by the quantity. I plan to add, delete, modify, and query a table one thousand times. To p

Using the vs2010 ADO. NET Entity model designer for. edmx file to set the "storegeneratedpattern" property of a database column (a feature not available at all in the ADO. NET Entity Model Designer of vs2008 SP1-thanks for exposing that property in the designer, but right now it's dangerous !) And associated entity pro

Http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring (V = vs.80). aspx Http://www.codeproject.com/Articles/17768/ADO-NET-Connection-Pooling-at-a-Glance The following table lists the valid names for Connection Pooling values withinConnectionstring. For more information, see using Connection pooling. Name Default Description Connection lifetime

Dataset is a new structure used by ADO. NET to store data in the memory. In some respects, Dataset and ADO have similar Recordset objects. However, Dataset can save the entire schema (including table, Link, keyword, and real data) in the memory, at this point, Dataset is more powerful than Recordset. Therefore, you can query and modify Dataset without worrying ab