connecting to a database

... result.ToString( ); } Discussion A Microsoft Access database password requires that users enter a password to obtain access to the database and database objects. This is also known as share-level ... those defined by ADO.NET. To open a database secured by a Microsoft Access database password, use the Jet OLEDB :Database Password attribute in the connection string to specify the password. This ... security. A password does not allow groups or users to have distinct levels of access or permissions. Anyone with the password has unrestricted access to the database. The Set Database command from...

Ngày tải lên: 24/12/2013, 05:15

... Team LiB ] [ Team LiB ] Recipe 1.4 Connecting to a Secured Access Database Problem You want to connect to a Microsoft Access database that has been secured with user-level security and ... database. The sample code contains a single event handler: Connect Button.Click Creates and opens a connection to a Microsoft Access database secured with user- level security and a workgroup ... defined by ADO.NET. To open a database secured by Microsoft Access user-level security, use the Jet OLEDB:System Database attribute in the connection string to specify the path and filename of...

Ngày tải lên: 24/12/2013, 05:15

... Create a SQL SELECT statement referencing a worksheet or a range in an Excel workbook and execute the statement to fill a DataSet using a DataAdapter or to create a DataReader. For example: ... INSERT INTO [MySheet$] (Field1, Field2, Field3) VALUES ('testdata', 1.234, '09/28/1979'); Retrieve data Use either a DataAdapter or a DataReader to retrieve data from an Excel ... 1-2 . Example 1-2. File: ExcelForm.cs // Namespaces, Variables, and Constants using System; using System.Configuration; using System.Data; private OleDbDataAdapter da; private DataTable...

Ngày tải lên: 14/12/2013, 18:16

... ConfigurationSettings.AppSettings["Sql_Msde_ConnectString"]); Manager and Query Analyzer are also shared. The System.Data.SqlClient class cannot automatically discover the port number of a named instance of SQL Server listening on a port other than ... need to understand what a SQL Server or MSDE named instance is and how to connect to one. The sample code contains a single event handler: Connect Button.Click Creates and opens a connection to ... [ Team LiB ] Recipe 1.7 Connecting to a Named Instance of SQL Server or Microsoft Data Engine (MSDE) Problem You want to connect to a named instance of a SQL Server or Microsoft Data Engine...

Ngày tải lên: 14/12/2013, 18:16

... provider can read records from and insert records into a text file data source. The Jet database engine can access other database file formats through Indexed Sequential Access Method (ISAM) drivers ... data adapter to retrieve all rows from text file. The MaxScanRows option indicates how many rows should be scanned to automatically determine column type. A value of 0 indicates that all rows ... provider to access data in a text file. The sample code creates an OleDbDataAdapter that uses the Jet OLE DB provider to load the contents of the text file Categories.txt, shown in Example 1-13 ,...

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 21/01/2014, 11:20

... following topics: ■ Setting Up Your Resources ■ Bundled databases ■ Other databases ■ Connecting to Databases ■ Adding Database Drivers ■ Establishing a Database Connection ■ Working with a Database ... represents a connection to a database. You need to set up a separate connection to each database on your database server that you want to use. You can use the database connection node to do the ... a connection to a database. Typically, there is at least one JDBC resource for each database accessed by an application. It is possible to have more than one JDBC resource for a database. To...

Ngày tải lên: 03/10/2013, 03:20

... Server and a DataSet object. You'll learn the details on how to pull rows from the database into a DataSet in Chapter 10 , and how to push changes made in a DataSet to the database in Chapter ... property, as shown in Figure 6.11 . Using a DataGrid Control to Access a Database In this section, you'll learn how to use a DataGrid control to access the rows in a database table. Follow ... you'll add a SqlConnection object and a SqlDataAdapter object to your form. Note You use a SqlConnection object to connect to a SQL Server database, and a SqlDataAdapter object to move rows...

Ngày tải lên: 07/11/2013, 10:15

... ADO.NET automatically stores database connections in a pool. Connection pooling offers a great performance improvement because you don't have to wait for a brand new connection to the database ... database to be established when there's a suitable connection already available. When you close a connection, that connection isn't actually closed; instead, your connection is marked as ... System.Data; using System.Data.SqlClient; class ConnectionPooling { public static void Main() { // create a SqlConnection object to connect to the database, // setting max pool size to...

Ngày tải lên: 07/11/2013, 10:15

... computers. For a user account local to the IIS computer, create a duplicate account on the Access computer with the same name and password. Grant the user account Log on Locally and Access this ... requires permissions to access the share that contains the database file and folders. The user account must be recognized by the Access computer. For a domain user account, add it to the permissions ... that the TEMP and TMP environment variables are properly configured. Configure the Access server On the Access computer, the user account that is used to access the database requires Read,...

Ngày tải lên: 07/11/2013, 13:15

... class. The following example defines a method named StateChangeHandler to handle the StateChange event. You'll notice that the second parameter to this method is a StateChangeEventArgs ... request to the database; two examples of states are open and closed. You use the Connection object's State property to get the current state of the connection to the database. The State property ... SqlConnection("server=localhost ;database= Northwind;uid=sa;pwd=sa"); // monitor the StateChange event using the StateChangeHandler() method mySqlConnection.StateChange += new StateChangeEventHandler(StateChangeHandler);...

Ngày tải lên: 14/12/2013, 13:15

... connecting to both an Access and an Oracle database. To interact with either of these databases in your program, you use classes from the System.Data.OleDb namespace. This namespace contains classes ... OracleNetServiceName Specifies the Oracle Net service name for the database. Oracle Net is a software component that allows you to connect to a database over a network. You'll need to ... with Oracle. This database contains a table called emp that contains sample employee data. Assuming the System.Data.OleDb namespace has been imported, the following example creates an OleDbConnection...

Ngày tải lên: 24/12/2013, 01:17

... configuration file named TNSNAMES.ORA to locate the Oracle database and determine how to connect to it based on the Data Source or Database attribute in the connection string. An example of an entry ... Oracle Button.Click Creates and opens a connection to an Oracle database using the Oracle .NET data provider. Information about the database is displayed from the properties of the OracleConnection ... to an Oracle database. Solution You can connect to an Oracle database using either the Oracle .NET data provider or the OLE DB .NET data provider. The sample code contains two event handlers:...

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 21/01/2014, 11:20

Ngày tải lên: 21/01/2014, 12:20

Ngày tải lên: 16/03/2014, 16:20

Ngày tải lên: 16/03/2014, 16:20

Ngày tải lên: 16/03/2014, 16:20