connecting to a database in visual studio 2012
Tài liệu Accessing a Database Using Visual Studio .NET ppt
... SQL statements visually by clicking the Show Diagram button in the toolbar and selecting columns from the table, as shown in Figure 3.29. As you can see, I've selected the ContactName, ... modify rows in the tables. You can drill down to the tables in the database by clicking the Add icon in the tree in Server Explorer, and you can retrieve the rows from a table by clicking the right ... to experiment with the Server Explorer-that's the best way to learn. Once you've connected to the database, you can view things such as the tables. You can also retrieve and...
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Using a DataReader Object in Visual Studio .NET
... object. For my installation of SQL Server, the password to access the Northwind database is sa, and my ConnectionString property is set to: data source=localhost;initial catalog=Northwind;persist ... visually create a DataReader object in Visual Studio .NET (VS .NET); you can only create them using program statements. In this section, you'll see how to create a SqlDataReader object and use ... keyboard, or select Debug â Start Without Debugging. Figure 9.4 shows the running form. Figure 9.4: The running form Using a DataReader Object in Visual Studio .NET You can't visually...
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Tài liệu Connecting to a Password-Protected Access Database ppt
... ex.Message); } resultTextBox.Text = result.ToString( ); } Discussion A Microsoft Access database password requires that users enter a password to obtain access to the database and database ... attributes in addition to 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 ... is also known as share-level 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. ...
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Tài liệu Connecting to a Secured Access Database pptx
... 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 ... 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 file using ... 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...
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Displaying an Image from a Database in a Web Forms Control
... need to display an image from a database column in an ASP.NET control. Solution Fill an ASP.NET Image control from a database field by pointing the ImageUrl property of an Image control to a ... the database and retrieve the image using a DataReader. A DataTable or DataSet filled using a DataAdapter can also be used. 3. Set the ContentType property of the HttpResponse object to the ... following steps outline the required tasks: 1. Create a web page that outputs a binary stream containing the image from the database. 2. Create a SQL statement to retrieve the required image...
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Displaying an Image from a Database in a Windows Forms Control
... within the data source, such as a row in a DataTable. The BindingContext class is used to instantiate a BindingManagerBase object and either a CurrencyManager or PropertyManager object is ... Database in a Windows Forms Control Problem You need to display an image from a database in a Windows Forms control. Solution Read the image into a byte array and load it directly into a PictureBox ... returned depending on the type of data source: ã The CurrencyManager class inherits from the BindingManagerBase class and maintains a pointer for the current item in a data source that implements...
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Define a Class in Visual Basic .NET
... wrapping a table in a class is to make access to this table as simple as possible. You could have one method to insert new rows to the database and one to update existing rows, leaving the task ... the same interface in different ways. An interface cannot exist as an object: It has no code and no place to store object data. A class that implements an interface has an explicit contract ... You can also create properties that accept a parameter. For example, in the Northwind database, a customer might have many orders. A parameterized property would be a perfect way to access...
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Tài liệu Connecting to a Microsoft Excel Workbook ppt
... 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 ... 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...
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Tài liệu Connecting to a Named Instance of SQL Server or Microsoft Data Engine (MSDE) docx
... 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 ... 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 ... 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...
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Tài liệu Connecting to a Text File pptx
... 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 ... access data stored in a text file. Solution Use the OLE DB Jet provider to access data in a text file. The sample code creates an OleDbDataAdapter that uses the Jet OLE DB provider to load the ... Namespaces, variables, and constants using System; using System.Configuration; using System.Windows.Forms; using System.Data; using System.Data.OleDb; // . . . // Create the data adapter...
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Tài liệu Storing XML to a Database Field doc
... demonstrates how to store XML data in a text field of a database table and subsequently read it into an XmlDocument using the LoadXml( ) method. Standard database access techniques using a DataAdapter ... System.Configuration; using System.Windows.Forms; using System.IO; using System.Xml; using System.Data; using System.Data.SqlClient; private DataTable dt; private SqlDataAdapter da; private ... // Create the data adapter. da = new SqlDataAdapter(selectText, ConfigurationSettings.AppSettings["Sql_ConnectString"]); da.UpdateCommand = new SqlCommand(updateText, da.SelectCommand.Connection);...
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Tài liệu Creating a DataView Using Visual Studio .NET pptx
... drop-down list to the right of the DataSource property, as shown in Figure 13.2. This binds the data stored in dataView1 to dataGrid1 and allows dataGrid1 to access any data stored in dataView1. ... Dataset link at the bottom of the Properties window for sqlDataAdapter1. Accept the defaults in the dialog box, and click the OK button to create a DataSet object named dataSet11. 5. Drag a DataView ... to your Northwind database. Remember to add a substring containing the password (pwd=sa, or similar). 4. Click on the sqlDataAdapter1 object in your form, and then click the Generate Dataset...
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Tài liệu Adding Tables to a Database pdf
... Team LiB ] Recipe 10.8 Adding Tables to a Database Problem You need to add a table to an existing database. Solution Use the CREATE TABLE statement. The sample code executes the DDL statement—using ... statement—using the ExecuteNonQuery( ) method of the Command object to add a table to an existing SQL Server database. The C# code is shown in Example 10-8. Example 10-8. File: AddTableToDatabaseForm.cs ... File: AddTableToDatabaseForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Data; using System.Data.SqlClient; // . . . SqlConnection...
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Tài liệu Defining a Relationship Using Visual Studio .NET doc
... Defining a Relationship Using Visual Studio .NET In this section, you'll see how to create a Windows application in Visual Studio .NET (VS .NET) with a DataSet containing two DataTable ... button to continue. A new DataSet named dataSet11 will be added to the tray beneath your form. Adding a Relation to the XML Schema of the DataSet Perform the following steps to add a relation ... relation Note You can add a relation to a strongly typed DataSet in the same way as described in this section. Figure 12.5: The Generate Dataset dialog box Notice that a new DataSet...
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