ado net tutorial

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Five objects in ADO. net

In ADO. net, there are five built-in objects: connection, command, datareader, dataadapter, and dataset. ADO. NET is mainly divided into: DataSet and. Net frameword data provisionProgram. Three methods of the command object: executenonquery (), executereader (), executesca

Cooperation between sqlcommand of ADO. NET 2.0 and sqldataadapter

(This post is posted on the old blog of the version engineer on)Sometimes, according to the project requirements, we may need to obtain multiple sets of datatables from the database, and thenLineCompile the code and present it on the ASP. NET 2.0 page in the desired format, instead of directly binding it to the gridview control. You can refer to the following practices.To join data from multiple tables in the database, multiple records (quantity is no

SQL commands in ADO. NET operate databases

We need to constantly read and write the database, so ExecuteNonQuery (), ExecuteReader () and ExecuteScalar () are what we need to use in database operations. Let's take a look at them one by one:ExecuteNonQuery (): This item allows us to use ExecuteNonQuery to change data in the database without using DataSet when updating the database. You can modify data in the database by executing UPDATE, INSERT, or delete SQL statements. Even if ExecuteNonQuery does not return any rows, the output paramet

C # ADO. NET five main objects < go to >

treated as a staging area (Cache), which preserves the data queried from the database and even displays the entire database. The ability of a dataset is not just to store multiple tables, but also to get some data table structures, such as primary keys, through DataSetCommand objects, and to record correlations between data tables. The DataSet object can be said to be a heavyweight object in ADO, which is not inherently capable of communicating with

SQL Server compact 3.5 B2 & sync services for ADO. Net documentation released

For those that have downloaded Visual Studio 2008 to get the latest version of SQL Server compact and sync services for ADO. net, you'll notice that we don't install the documentation for these products with Visual Studio. Why? Well, our documentation process here at Microsoft can be quite complex. with all the integration and multiple versions we support, we have to lock things down very early. we had some

ADO. NET and parameterized stored procedures

Using ADO. Net with parameterized stored procedures ADO. net class that deals with input and output stored procedure parameters is dbcommand. this shouldn't come as a big surprise-dbcommand is responsible for executing commands on the database, so it makes sense that it shoshould also deal with their parameters. (

Use of connection pool technology in ADO. NET

It usually takes some time to connect to the database server, and the server also needs some resources to process the connection. Web applications sometimes process thousands of connections and require a considerable amount of resources to process connections. ADO. NET has the connection pool feature. The function of the connection pool is to retain a certain number of connections. When you use the same con

ADO. NET database programming reads data using application configuration files

// The following is my personal application configuration file App. config: overwrite all the content in App. config in the project.ConnectionString = "Provider = Microsoft. Jet. OLEDB.4.0; Data Source = StoreMIS. mdb; Persist Security Info = false ;"ProviderName = "System. Data. OleDb"/> // Add the following two green namespaces for Reference// Expand the ADO. NET project --> right-click the gray "Referenc

Ado. NET Notes

One, ADO (Access data Object). NET operations database a set of classes1. DataSet (Data Set)2.. NET provider (data Provider)2.1. Connection2.2. Command2.3. DataReader2.4. DataAdapterSecond, Connection (Connection object)1. Create:SqlConnection conn = new SqlConnection ();Conn. ConnectionString = "Connection string";Or:SqlConnection conn = new SqlConnection (conne

Ado. NET connection pool technology use of detailed _ practical skills

Connecting to a database server usually takes a certain amount of time, and the server also needs a certain amount of resources to handle the connection. Web applications sometimes handle thousands of connections and require a considerable amount of resources to handle connections. Ado. NET has the characteristics of a connection pool, the function of the connection pool is to retain a certain number of con

System. Data. SQLite (SQLite ADO. NET 2.0 provider, which already contains the SQLite engine)

sortingFully supports user-defined functions and sorting methods, which means you can use your favorite. NetLanguage implementationSQLiteFeatures not provided.It would be very simple.. Provides allSource code. 100%Free.All encapsulated database sourcesCodeAll are public.Neither individual nor commercial applications have any protocol constraints.. Home: http://sqlite.phxsoftware.com/ (Latest Version 1.0.38.0): http://sourceforge.net/project/showfiles.php? Group_id = 132486 package_id =

Ado. NET usage tips (1)-Overview

Survival Confirmation! We come to the battlefield of the database, here, if you do not master the combat skills, may not even a day to live. So let's start with the most basic ADO in the. NET Framework. With this in hand, you can barely survive the battlefield of this database.Ado. NET is divided into five major categories , there are two ways to manipulate the

Analysis on the number of entity classes generated when ADO. NET Entity Framework is used less than the number of data tables

When you generate an ADO. NET Entity Data Model (Entity Data Model) through a database, the number of entity classes generated may be less than the number of data tables. The following describes two possible causes. 1. All columns of the data table can be empty. When a data table has a primary key, the object data model uses the primary key as the entity key to identify an object. If the data table does n

Database operations through ADO. net

Database Operations mainly involve executing commands and reading data. 1. Connection To access the database, you must first establish a connection with the database. In ADO. net, the connection object is used to establish a connection with the database. For example, the code used to establish a connection to the mycharge database on the sqlserver Server: Dim cnstr as string = "Password = 123456; persi

Ado. NET knowledge points

Today I reviewed the ADO and summed up their knowledge.ADO is a set of classes that expose data access services to. NET programmers. Provides access to a variety of relational data, XML, and application data.All data access classes are located in System.Data.dll. The System.Data contains a dataset and other support classes, and the System.Data.SqlClient data provider is dedicated to the SQL Server database.

What scenarios are the ADO-net Entity Framework used in?

will usually be: Traverse query full table data, then filter at OO level Needlessly perform instantiation, query, or waste cache resources, or waste query resources I can only say that this is a developer level issue, although it is difficult to locate after a problem, especially in general, will cause memory leaks.Finally, the most common is back to the data model synchronization problem. When the data model changes, it needs to be synchronized, and if there is already busine

Ado. Analysis of most table operations in net-read

ado| data ADO. Analysis of most table operations in net-read Author: Zhengzo??????? 2004-8-5 ???????? In the development based. NET Platform database application, we generally use dataset, as the core class of Ado.net it provides us with powerful functions, and the whole looks like a small database in memory, includi

Ado. NET notes--use DataAdapter to perform additions and deletions

Related knowledge: Once the data in the dataset is downloaded from the database, it is no longer in contact with the database. If you modify the data in the dataset, you need to reestablish the connection and update the changes to the database with the SQL command Writing SQL commands is often cumbersome and mechanized, ADO. NET provides a SqlCommandBuilder object that helps the DataAdapter obj

ADO. NET Learning Series (4) --- form version of the login applet, ado.net form

ADO. NET Learning Series (4) --- form version of the login applet, ado.net form 1. Requirement Analysis: Create a login Applet based on Winform applets. Basic requirements: logon successful: the pop-up box displays logon successful. If logon fails, the pop-up box displays failure. Extended Function: if the number of logon attempts exceeds 3, the user will be "locked" and the system prompts that there are to

C # improve the knowledge of ADO. NET object data model (3)-about rollback

Original ADO. NET Entity Data Model, in fact, I do not like to use this, mainly in the case of complex queries, writing a lot of linq statements, of course, can also directly execute SQL statements, however, complex SQL statements cannot be executed because of connection problems.But ADO. NET Entity has the advantage o

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