to retrieve all of a table takes time, especially if there are many rows in the table.
This is because accessing the database, locating and processing the data, and then transferring the data to the client is time-consuming. For most applications, these provide a convenient representation of data source information.
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NET To a Visual Fox Pro developer, one of the most important aspects of software development is data access.
This chapter shows you how to use Microsofts new universal data access technology, ADO.
string query String = "SELECT Customer ID, Company Name FROM dbo. A Using connection As Ole Db Connection = New Ole Db Connection( _ "Provider=MSData Shape; Data Provider=SQLOLEDB;" & _ "Data Source=(local); Integrated " & _ "Security=SSPI; Initial Catalog=northwind") Dim adapter As Ole Db Data Adapter = New Ole Db Data Adapter( _ "SHAPE " & _ "APPEND ( AS Orders " & _ "RELATE Customer ID TO Customer ID)", connection) Dim customers As Data Set = New Data Set() adapter.
Customers"; Sql Data Adapter adapter = new Sql Data Adapter(query String, connection); Data Set customers = new Data Set(); adapter. Columns("Customer ID")) Dim p Row, c Row As Data Row For Each p Row In customer Orders.
Based on this, Im sure most VFP developers are very interested in . This chapter does not attempt to cover all the idiosyncrasies of data access with ADO.
Customers" Dim adapter As Sql Data Adapter = New Sql Data Adapter( _ query String, connection) Dim customers As Data Set = New Data Set adapter. Sql Data Adapter cust Adapter = new Sql Data Adapter( "SELECT * FROM dbo. An auto-incrementing integer column will still be added to the table, but no child table will be created or filled, and no relation will be created.
Fill(customers, "Customers") // Assumes that connection is a valid Sql Connection object. Customers", customer Connection); Ole Db Data Adapter ord Adapter = new Ole Db Data Adapter( "SELECT * FROM Orders", order Connection); Data Set customer Orders = new Data Set(); cust Adapter. Fill(customer Orders, "Orders"); Data Relation relation = customer Orders. The following example uses the MSData Shape Provider to generate a chapter column of orders for each customer in a list of customers.
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