''''读入文件数据 Dim fs = New FileStream("c:\1.jpg", IO.FileMode.Open, IO.FileAccess.Read) Dim imgData(fs.Length - 1) As Byte fs.Read(imgData, 0, fs.Length - 1) fs.close()
Dim tempConnection As New SqlConnection Dim tempAdapter As SqlDataAdapter Dim tempDataSet As New DataSet ''''打开数据库连接 tempConnection.ConnectionString = "server=s_Test;uid=sa;pwd=7890;database=db_test" tempConnection.Open() tempAdapter = New SqlDataAdapter("SELECT * FROM tb_test WHERE 1=0", tempConnection) Dim cb As New SqlCommandBuilder(tempAdapter) tempAdapter.Fill(tempDataSet) ''''插入一条记录 Dim tempDataRow As DataRow tempDataRow = tempDataSet.Tables(0).NewRow() tempDataRow("photo") = imgData tempDataSet.Tables(0).Rows.Add(tempDataRow) tempAdapter.Update(tempDataSet) tempConnection.Close() End Sub End Class 二、将数据库中的文件保存至硬盘(VB.NET) ''''---------------------------------------------------------- ''''---------------------------------------------------------- ''''下面的示例将数据库的tb_test表中第一条记录的photo保存至c:\2.jpg ''''---------------------------------------------------------- ''''---------------------------------------------------------- Imports System.IO Imports System.Data.SqlClient
Public Class image Shared Sub Main()
Dim tempConnection As New SqlConnection Dim tempAdapter As SqlDataAdapter Dim tempDataSet As New DataSet ''''打开数据库连接,取出数据 tempConnection.ConnectionString = "server=s_test;uid=sa;pwd=7890;database=db_test" tempConnection.Open() tempAdapter = New SqlDataAdapter("SELECT TOP 1 * FROM tb_test", tempConnection) tempAdapter.Fill(tempDataSet) tempConnection.Close()
If tempDataSet.Tables(0).Rows.Count > 0 Then ''''将文件保存到硬盘文件c:\2.jpg Dim imgData() As Byte imgData = tempDataSet.Tables(0).Rows(0).Item("photo") Dim fs As FileStream fs = File.Create("c:\2.jpg", imgData.Length - 1) fs.Write(imgData, 0, imgData.Length - 1) fs.Close() End If End Sub End Class
''''读取文件 Dim fs = New System.IO.FileStream("c:\2.jpg", IO.FileMode.Open, IO.FileAccess.Read) Dim imgData(fs.Length - 1) As Byte fs.Read(imgData, 0, fs.Length - 1) fs.close()
Dim tempConnection As New SqlConnection Dim tempAdapter As SqlDataAdapter Dim tempDataSet As New DataSet ''''打开数据库连接,取出数据 tempConnection.ConnectionString = "server=s_test;uid=sa;pwd=7890;database=db_test" tempConnection.Open() tempAdapter = New SqlDataAdapter("SELECT TOP 1 * FROM tb_test", tempConnection) tempAdapter.Fill(tempDataSet) ''''更新数据 Dim cb As New SqlCommandBuilder(tempAdapter) tempDataSet = New DataSet tempAdapter.Fill(tempDataSet) tempDataSet.Tables(0).Rows(0).Item("photo") = imgData tempAdapter.Update(tempDataSet) tempConnection.Close() End Sub End Class 总结：
注：本站部分文章源于互联网，版权归原作者所有！如有侵权，请原作者与本站联系，本站将立即删除！ 本站文章除特别注明外均可转载，但需注明出处！ [MinTao学以致用网] 
