sqlite ado net

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

Ado. NET Component You can use two components of ADO. Net to access and process data: . NET Framework data provisionProgram . NET Framework data provider The. NET Fr

ADO. NET Learning Series (II) and ado.net Learning Series This time, I used ADO. NET to insert a piece of data to the database. The primary uses the stored procedure. I don't want to use SQL text every time, so there is no progress ~~~ First, I will paste the database script that I will use in this exercise:1 USE maste

I recently saw ADO. NET data service in my learning process. It seems to be very useful and I will use it today; At present, his operating mechanism is not very clear. First, let's take an example to feel his benefits; In the later learning process, you may learn more deeply, and enjoy a better understanding of its internal mechanisms; First look at the creation process: 1. Create an ASP. NETProgram

Microsoft has developed a new term, connection mode and disconnection mode. The dataset mode in the memory seems to have been available for a long time, and the clientdataset of Delphi seems to be in this structure. I still haven't seen any innovations in. net. In addition, ADO itself has such a client-disconnected DataSet object recordset. "dataset can manage multiple datasets and Their Relationships." Thi

);// The first parameter indicates the name of the created constraint, the second parameter indicates the column to which the constraint is added, and the third parameter true indicates the primary key constraint and false indicates the uniqueness constraint. Implicitly create a foreign key constraint Datatable. Constraints. Add ("fk_customerid", tblcustomers. Columns ["mermerid"] , Tblorders. Columns ["mermerid"]);// The first parameter represents the constraint name, the second parameter repr

"); // = true; Of course, if you use different Context instance queries, the cache function will be effective. Well, let's take a look at ADO. NET Entity Framework beta 3:// PubsEntites is the System. Data. Objects. ObjectContext derived object of ADO. NET Entity Framework. PubsEntities context = new pubsEntities ();

　　　　　　 stringConstr =@"server=.; Database=mydatabase;uid=sa;pwd=sa"; stringsql ="SELECT * Top from Data"; DataSet DS=NewDataSet (); using(SqlDataAdapter adapter =NewSqlDataAdapter (SQL, CONSTR)) {Adapter. Fill (DS); } //Take out the data in the dataset//traverse out each table in the DataSet DS for(inti =0; I ) {DataTable dt=ds. Tables[i]; //traverse each row in the DataTable DT for(intj =0; J ) {DataRow row=dt.

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 string is the key to opening the data source, wha

ado| data ADO. Analysis of most of the table operations in net-modification Author: Zhengzo??????? 2004-8-5 Iii. Updating data sets The first thing to note is that I've removed the Order Details table, and the two-table operation is just a few of the fields. The following is the form interface: Figure 3-1 The radio box is used to select different update m

Label:Refer to other people's methods, and then review the relevant knowledge of ADO. Prepare for your own class library. namespace Common.sqlhelper {// ADO. NET package of SqlHelper

I. ADO access database objectA) Connection object:SqlConnectionGuide Pack of two:using System.Data; using System.Data.SqlClient;Connection string:string constr = "server=.; Uid=accp;pwd=bdqn;database=qqmaster ";To Create a Connection object: SqlConnection con = new SqlConnection (CONSTR);b) Operating object:SqlCommandTo create an Action object: SqlCommand cmd = new SqlCommand ();put the pipes and pumps together:cmd. Connection = con;provide SQL instru

To use the SQLite database in an ASP. NET project, download an ADO. NET 2.0 SQLite data provider, which is: http://sourceforge.net/project/showfiles.php? Group_id = 132486 package_id = 145568. After the package is downloaded and installed Program It is automatically regist

PrefaceAdo. NET includes 5 large objects, namely connection, Command, DataReader, DataSet, DataAdapter, using ADO to access the database has two steps: to establish a database connection, read or update data. There are two main ways of reading data: Command and DataReader, DataAdapter and DataSet.Connection to MySQL database preparation 1. Download the free-install. zip link on the MySQL website as follows:

connection is established, close is not closed directly, but is saved in the connection pool.on the next connection, if the connection string is the same, the connection in the connection pool is called. instead of re-establishing. This will improve some efficiency. This has been verified in the experiment one .1. The Conn object is destroyed, and the connection in the connection pool is not destroyed.2. Connection pooling is provided by ADO, not t

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

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 example in my bo