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connecting to a sql database from excel

Using a SqlConnection Object to Connect to a SQL Server Database phần 1

Using a SqlConnection Object to Connect to a SQL Server Database phần 1

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... performance improvement because you don't have to wait for a brand new connection to the database to be established when there's a suitable connection already available. When you close a ... Opening and closing a database connection is a relatively time-consuming process. For this reason, ADO.NET automatically stores database connections in a pool. Connection pooling offers a great ... (same database, username, password, and so on), then the connection from the pool is retrieved and returned to you. You then use that same connection to access the database. When using a SqlConnection...
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Tài liệu Using a SqlConnection Object to Connect to a SQL Server Database phần 2 doc

Tài liệu Using a SqlConnection Object to Connect to a SQL Server Database phần 2 doc

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... 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 ... System.Data.SqlClient.SqlError: This is the message from the RAISERROR statement The state of a connection enables you to know the progress of your connection request to the database; two examples ... Closed to Open Calling mySqlConnection.Close() mySqlConnection State has changed from Open to Closed The InfoMessage Event The InfoMessage event fires when the database returns a warning...
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Tài liệu Connecting to a Microsoft Excel Workbook ppt

Tài liệu Connecting to a Microsoft Excel Workbook ppt

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... using a DataAdapter or to create a DataReader. For example: SELECT * FROM [MySheet$] Update data The UPDATE command, either static or parameterized, can update data in a worksheet or range. ... DataReader to retrieve data from an Excel workbook. Create a SQL SELECT statement referencing a worksheet or a range in an Excel workbook and execute the statement to fill a DataSet using a ... data into a worksheet or range: INSERT INTO [MySheet$] (Field1, Field2, Field3) VALUES ('testdata', 1.234, '09/28/1979'); Retrieve data Use either a DataAdapter or a...
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Tài liệu Connecting to a Named Instance of SQL Server or Microsoft Data Engine (MSDE) docx

Tài liệu Connecting to a Named Instance of SQL Server or Microsoft Data Engine (MSDE) docx

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... 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 ... 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...
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Tài liệu Connecting to a Password-Protected Access Database ppt

Tài liệu Connecting to a Password-Protected Access Database ppt

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... 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...
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Tài liệu Connecting to a Secured Access Database pptx

Tài liệu Connecting to a Secured Access Database pptx

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... 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...
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Tài liệu Connecting to a Text File pptx

Tài liệu Connecting to a Text File pptx

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... 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,...
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Tài liệu Connecting to an Oracle Database docx

Tài liệu Connecting to an Oracle Database docx

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... 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 ... .NET data provider should be used primarily as a bridge from applications that already use ODBC. Use a native Oracle .NET data provider where practical. TNSNAMES.ORA Oracle uses a configuration...
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Tài liệu Connecting to SQL Server Using Integrated Security from ASP.NET ppt

Tài liệu Connecting to SQL Server Using Integrated Security from ASP.NET ppt

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... that all application users are on the same domain so that their credentials are available to IIS. The following areas of the application need to be configured: ã Configure the ASP.NET application ... Connect to SQL Server from ASP.NET using Windows Authentication in SQL Server. Discussion Connecting to a SQL Server database provides two different authentication modes: Windows Authentication ... that Integrated Windows Authentication is enabled and Anonymous Access is disabled. ã The web.config file establishes the authentication mode that the application uses and that the application...
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Design and Implement a SQL Server Database

Design and Implement a SQL Server Database

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... Kế Một Database Tạo Một User Database Chúng ta có thể tạo một database dễ dàng dùng SQL Server Enterprise bằng cách right-click lên trên " ;database& quot; và chọn "New Database& quot; ... một database object (table, view ) hay một data type. Sp_helpdb [&apos ;database& apos;] Cung cấp thông tin về một database cụ thể nào đó. Sp_monitor Cho biết độ bận rộn c a SQL Server Sp_spaceused ... 2000, thông thường đó là Default Instance. Một Instance c a SQL Server 2000 có 4 system databases và mt hay nhiu user database. Cỏc system databases bao gm:ã Master : Ch a tất cả những thông tin...
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Design and Implement a SQL Server Database

Design and Implement a SQL Server Database

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... user database được tạo ra thì SQL Server sẽ copy to n bộ cácsystem objects (tables, stored procedures ) từ Model database sang database mi va to. ã Msdb : Database này được SQL Server Agent ... ta nói đến một Instance c a SQL Server 2000, thông thường đó là Default Instance. Một Instance c a SQL Server 2000có 4 system databases và một hay nhiều user database. Các system databases bao ... Sp_help ['object'] Cung cấp thông tin về một database object (table, view ) hay một data type. Sp_helpdb [&apos ;database& apos;] Cung cấp thông tin về một database cụ thể nào đó. Sau đó...
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Specifying Locking Hints in a SQL Server Database

Specifying Locking Hints in a SQL Server Database

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... command. SqlCommand cmd = new SqlCommand(sqlText, conn, tran); // Create the DataAdapter and CommandBuilder. SqlDataAdapter da = new SqlDataAdapter(cmd); SqlCommandBuilder cb = new SqlCommandBuilder(da); ... from changing data being read by a user and preventing users from reading data being changed by a user. Locks are acquired and released by user actions; they are managed internally by database ... ReadCommitted. A DataAdapter is used on the transacted connection to fill a DataTable. A CommandBuilder is created to generate updating logic. The default view of the table is bound to the data grid...
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