c#怎么存取sqlserver数据库binary类型,如下题

发布网友发布时间：2022-04-11 21:04

共1个回答

热心网友时间：2022-04-11 22:33

//把文件转成二进制流出入数据库
private void button2_Click(object sender, EventArgs e)
{
    FileStream fs = new FileStream(textBox1.Text, FileMode.Open);
    BinaryReader br = new BinaryReader(fs);
    Byte[] byData = br.ReadBytes((int)fs.Length);
    fs.Close();
    string conn = "server=.;database=testDB;Uid=sa;Pwd=sa ";
    SqlConnection myconn = new SqlConnection(conn);
    myconn.Open();
    string str = "insert into pro_table (pro_name,pro_file) values('测试文件',@file)";
    SqlCommand mycomm = new SqlCommand(str, myconn);
    mycomm.Parameters.Add("@file", SqlDbType.Binary, byData.Length);
    mycomm.Parameters["@file"].Value = byData;
    mycomm.ExecuteNonQuery();
    myconn.Close();
}

//从数据库中把二进制流读出写入还原成文件
private void button4_Click(object sender, EventArgs e)
{
    string conn = "server=.;database=testDB;Uid=sa;Pwd=sa ";
    string str = "select pro_file from pro_table where pro_name='测试文件' ";
    SqlConnection myconn = new SqlConnection(conn);
    SqlDataAdapter sda = new SqlDataAdapter(str, conn);
    DataSet myds = new DataSet();
    myconn.Open();
    sda.Fill(myds);
    myconn.Close();
    Byte[] Files = (Byte[])myds.Tables[0].Rows[0]["pro_file"];
    BinaryWriter bw = new BinaryWriter(File.Open("D:\\2.rdlc",FileMode.OpenOrCreate));
    bw.Write(Files);
    bw.Close();

}