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Recently, when learning ADO, the data access method was mentioned: connection oriented and non-connection oriented. So, Baidu a bit, found that there is no good information, however, in the school library found a good book ("ASP. NET MVC5 Web site development of the United States", of course, I am not advertising, on
Packaging | data | database | Strings Nowadays, most of the development Web applications are using the Browser/server mode, while in the B/s Application development field, Microsoft's iis/asp combination has the powerful function, the good expansion ability and the good compatibility with other Microsoft products, Pop up quickly. ASP with its simple and easy to learn, powerful and win the love of the vast number of programmers, most of the domestic we
Summary of ASP. NET database connection and data retrieval methods, asp.net Database
This article describes how ASP. NET connects to the database and obtains data. We will share this with you for your reference. The details are as
Access | schema | data | database ' ####### #数据库访问层 ##########
' Returns a ADOCN connection object
' Unlike C #, you can't turn off connections and free memory here.
Public Function GETCN (sDBPath as String) as ADODB. Connection
Const Spro as String = "Provider=Microsoft.Jet.OLEDB.4.0;Data source="
Const sdbpwd a
1. Reference Microsoft ActiveX Data Objects 2.5 Library
2. Form implementation text box names: txtusername txtpassword
The buttons are named cmdok named cancel respectively.
.
3. Code Implementation
(1). Implement the check_password () method to verify the user name and password
Private function check_password (byval username as string ,_
Byval password as string) as byteOn Error goto gperrorDim objcn as new connection, objrs as new recordset ,_
Strcn
Update NBearLite to v1.0.0.6 beta
Fully supports SQL Server, Oracle, MySql, and PostgreSql database Stored Procedure Call code generation (C #/VB. NET) and various parameter types such as input, output, and return.
Sub Query is supported.
Save able/DataRow is supported.
See: http://www.cnblogs.com/teddyma/archive/2007/07/20/825384.html
Introduction
Use nbearlite.
illustrate the problem, we first create a database in Access2000 (assuming its filename is Star.mdb), which has a data table named Star, with fields in the datasheet: number, name, sex, age, file name. The program runs as shown in Figure 1, where you can browse not only records, but also edit, add, and delete records. Because the file name of the graphic is used when editing and adding a record, it's a good idea to make it easier to manipulate the fi
Frequently, the database often has problems with operations when working in an Access database. And the database is infinitely larger. In order not to affect the use we need to compress/repair the database. The following code is used to compress and repair the
()Dim tM As New System. Messaging. MessageQueue ()TM. Path = ". Private $ jk" '"FORMATNAME: PUBLIC = 3d3dc813-c555-4fd3-8ce0-79d5b45e0d75"' establishes a connection with the message queue on the specified computer,Dim newMessage As New System. Messaging. Message (TextBox1.Text) 'Accept the t-SQL statement of the text basketNewMessage. Label = "This is the label" 'message name,TM. Send (newMessage) 'sends a messageEnd Sub
Server program:
Public Sub se
Tags: WinForm style blog http color os using IO strongArticle One: WinForm Development general overview and technology realizationChapter Two: WinForm Development Sector Graph statistics and Excel data exportArticle Three: Access remote connection database and form packaging deployment
"Xiao Kee": recently completed a legal consulting management system base
A Web System of VB. NET + Asp.net that uses the SQL2000 database. At the beginning, there were dozens of connected users, and there was no problem after the first year of operation. Later, the number of connections increased to about 800. Now, a strange phenomenon occurs occasionally during the operation. When a user logs on, the logon interface is actually anoth
. forname (driver); // 2. Establish a connection through the URL and connect to the database connection = drivermanager. getconnection (URL, user, Password); // 3. Create a statement. The connection can be seen in the statement, and the statement can be seen in the cable car ST = c
Before using the three-layer to do a log on the small demo, the problem is still a lot of, but also said the past. After that, you want to fix the string that connects the database, add it to the configuration file, and directly reference the configuration file in the code, read the data, and connect the database for subsequent work. However, in this simple configuration file, there is a small problem.
This
Example | data | database | database connection | String using DSN's database connection string example:
MS Sql/mysql/postgresql
"Dsn=dsnname"
Do not use DSN database connection
Example of a database connection string using DSN:
MS Sql/mysql/postgresql
"Dsn=dsnname"
Do not use DSN database connection string Example:
MS Access
via OLE DB:
"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:somepathmydb.mdb; "
MS SQL
Through ODBC:
"Driver={sql Server};
first, the realization of ideas:
When a user adds or modifies a picture, it controls the use of the CommonDialog showopen dialog box, records the filename of the common dialog box to variable A, and then uses App.Path to find the picture file in a specific directory, changing the properties of the picture control on the form to display. The database uses only one text Type field to record the variable A, the picture file is saved in the program direc
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