VB.NET数据库怎么用
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VB.NET数据库代码示例：
Imports System
Imports System.Data
Imports System.Data.SqlClient
public Class MainClassclass MainClass
Shared Sub Main()Sub Main()
Dim thisConnection As New SqlConnection
("server=(local)\SQLEXPRESS;" & _"integrated security=sspi;database=
MyDatabase")' Sql Query
Dim sql As String = "SELECT *
FROM Employee "Dim insertSql As String = "INSERT
INTO Employee " & _"(ID, FirstName, LastName)VALUES" & _
"(@ID, @FirstName, @LastName)"
Try
' Create Data Adapter
Dim da As New SqlDataAdapter
da.SelectCommand = New SqlCommand
(sql, thisConnection)' Create and fill Dataset
Dim ds As New DataSet
da.Fill(ds, "Employee")
' Get the Data Table
Dim dt As DataTable = ds.Tables
("Employee")' Display Rows Before Changed
Console.WriteLine("Before altering
the dataset")For Each row As DataRow In dt.Rows
Console.WriteLine("{0} | {1} | {2}", _
row("ID").ToString().PadRight(10), _
row("FirstName").ToString().PadRight(10), _
row("LastName"))
Next
' Add A Row
Dim newRow As DataRow = dt.NewRow()
newRow("FirstName") = "Edna"
newRow("LastName") = "Everage"
newRow("ID") = "2"
dt.Rows.Add(newRow)
' Display Rows After Alteration
Console.WriteLine("=========")
Console.WriteLine("After
altering the dataset")For Each row As DataRow In dt.Rows
Console.WriteLine("{0} | {1} | {2}", _
row("ID").ToString().PadRight(10), _
row("FirstName").ToString().PadRight(10), _
row("LastName"))
Next
' Insert employees
' 1. Create command
Dim insertCmd As New SqlCommand
(insertSql, thisConnection)' 2. Map parameters
insertCmd.Parameters.Add("@FirstName", _
SqlDbType.NVarChar, 10, "FirstName")
insertCmd.Parameters.Add("@LastName", _
SqlDbType.NVarChar, 20, "LastName")
insertCmd.Parameters.Add("@ID", _
SqlDbType.Int, 15, "ID")
' 3. Insert employees
da.InsertCommand = insertCmd
da.Update(ds, "Employee")
Catch ex As SqlException
' Display error
Console.WriteLine("Error: "
& ex.ToString())Finally
' Close Connection
thisConnection.Close()
Console.WriteLine("Connection
Closed")End Try
End Sub
End Class
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