ado net c# example

I. ADO Merging object-oriented query statements1. Query only one piece of data//the Select method in data Access PublicStuSelect(stringXuehao) {stu S=NULL; Cmd.commandtext="Select *from stu where [email protected]"; Cmd. Parameters.clear (); Cmd. Parameters.Add ("@a", Xuehao); Conn. Open (); SqlDataReader Dr=cmd. ExecuteReader (); if(Dr. hasrows) {Dr. Read (); S=NewStu (); S.xuehao=dr["Xuehao"]. ToS

Many beginners of C # programming or asp.net will be exposed to Connection objects, Command objects, DataAdapter objects, DataSet objects, and DataReader objects, which constitute ADO. NET, which is used for Web/WinForm data interaction. (This article is written for beginners. If you have any questions, please contact Me or Mail Me. Please give Me more advice) he

For Learning ADO. for net data access technology, dataadapter may often confuse them, especially those who are used to developing dataadapter controls. NET data access control, we do not even need to write a line Code You can complete all kinds of data access and operations you need. However, while enjoying fast and convenient operations, you will always feel a

Ado| notes have been reading "ADO" in the library for the last few days. NET Practical guide, found really a good book. Reading naturally have experience, I based on the book clues, their learning experience mainly in the form of code records down. (The book corresponds to the code in the Http://www.adoguy.com/book) 1, Connection

time the same application domain can have multiple different types of connection pools. In detail, it is identified by the process, application domain, connection string, and the Windows identity (when using integrated security) to form a signature to identify the distinction. However, for the same application domain, it is generally only by the connection string to identify the distinction, that is, the connection string is different, cannot use the same connection pool, a program may have mor

zones (cache ),The data queried from the database can be retained.Or even display the entire database. Dataset can not only store multiple tables, but also obtain data table structures such as primary keys through the datasetcommand object and record the association between data tables. Dataset objects can be considered heavyweight objects in ADO. net,This object is structured on the datasetcommand object

This article from: http://www.builder.com.cn/2007/0924/521134.shtml In the ADO. Net object model, the connection object represents the connection with the data source .. Net Framework has two connection objects: oledbconnection, used for most database connections, and sqlconnection, which is a connection specially developed by MS for SQL Server. Before creating a

Browse multiple related tables in the ADO. Net dataset (1) Author: MicrosoftWww.aspcool.comTime: 13:48:24 views:13475 Abstract: a dataset in ADO. Net is a way to represent data in memory. It can contain multiple related data tables. This article describes h

choices. Data access technologies include Microsoft ADO. NET Command, DataReader, DataSet, and XMLReader. Here, Microsoft SQL ServerTM 2000 databases are used to compare the differences between these technologies in some typical application environments. In these comparisons, a series of command operations will be executed on the Customer, Order, and OrderDetail data within a certain user load range. Tes

SummaryIn the previous articles, I did not elaborate on the data provider core object, because I would like to give you a good idea of some basic concepts before I can explain these objects. In the previous article, "You Must know the ADO (c) connection string, you underestimate it," I explained in detail the connection string, I believe everyone and I just as aware of its importance. If the connection stri

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

As we all know, the biggest advantage of ADO. net over ADO is that the data update and modification can be performed when it is completely disconnected from the data source, and then the data update is passed back to the data source. This greatly reduces the occupation of Database Server resources due to excessive connections. The following is an

("\ndatabase is closed.");39}40Console.read ();42}43}44}Results:6. Write elegant and Secure Code (1) Add Try...catch blockWe know there may be exceptions when connecting to the database, so we need to add exception handling. For C #, typical exception handling is to add Try...catch blocks of code. The finially is optional. Finially is a block of code that executes regardless of whether the code has an exception. and The database connection resources,

Ado. Net has two basic parts: DataSet and managed provider. The following is a brief overview of dataset's common methods. Dataset is a database in memory that provides consistent Program Design the model, regardless of where it comes from. Dataset consists of a group of tables, columns, rows, constraints, and relationships. The object model for dataset is as follows: A data table (able) is a memory

Browse multiple related tables in the ADO. Net dataset (6) Author: MicrosoftWww.aspcool.comTime: 17:40:06 views:9727 Expression ColumnIn addition to static data, you can also assign a value to datacolumn based on the expression results. An expression is a string assigned to the datacolumn. Expression attribute.When expressions are used together

ActiveX Data Objects (ADO) are high-level database APIs above OLE DB. We can also call ADO in C + + programs. This article will be in VC 6.0 environment to do a small example to explain how to use ADO. 1. Build the application framework and initialize the Ole/com library en

process. I don't like things that do not like to talk at ordinary times, because at that time, we didn't know what he thought about the things, it's hard to guess what he is thinking. Since Hibernate and ADO are mentioned above. net, so I added this paragraph again. Oh, well, I should review some of my previous knowledge. If I can't summarize it, I should just make a note, I hope the experts will not laugh

ADO. NET learning notes getting started, ado.net learning notes This article Reprinted from: http://www.youarebug.com/forum.php? Mod = viewthread tid = 57 page = 1 extra = # pid63 This is my note in learning ADP. NET. It can be used as an introduction to ADO. NET or a rev

Atozed, a company that created a new project (Indy is also engaged in), attempts to build a bridge between native and. net so that Delphi can use. NET components: Http://www.atozed.com/CrossTalk/index.EN.aspx Because after ado2.8, Ms is no longer maintained, all of them are transferred to ADO. net, I have always wanted

Connecting to Microsoft SQL azure database using ADO. Net has become very easy now.ArticleProvides an example ConsoleProgramTo describe how to connect to the azure database, there are also some notes I think about connecting to the Microsoft SQL azure database. SQL azure entry level issues. Ha, azure talents can bypass. Console program