存读Blob Oracle

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OracleClient;
using System.IO;

namespace TestOraclBlob
{
    public partial class Form1 : Form
    {
        OracleConnection conn;
        public Form1()
        {
            InitializeComponent();
            string strCon = "Data Source=orcl;Persist Security Info=True;User ID=wcq;Password=wcq123;Unicode=True;";
            conn = new OracleConnection(strCon);
        }
        //写入数据库
        private void button1_Click(object sender, EventArgs e)
        {
            OracleCommand cmd = new OracleCommand("", conn);

string path = @"C:\Users\lenovo\Desktop\01.pdf";
            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            Byte[] fsByte = new byte[fs.Length]; //把图片转成 Byte型 二进制流  
            fs.Read(fsByte, 0, fsByte.Length);   //把二进制流读入缓冲区   
            fs.Close();

cmd.CommandText = "insert into Student(id,name,storeblob) values(1,'aa',:zp)";
            cmd.Parameters.Add(":zp", OracleType.BFile, fsByte.Length);
            cmd.Parameters[0].Value = fsByte;

conn.Open();
            cmd.ExecuteNonQuery();

MessageBox.Show("插入成功！");
            conn.Close();
        }

private void button2_Click(object sender, EventArgs e)
        {
            string path = @"C:\Users\lenovo\Desktop\2.pdf";

DataTable dt = new DataTable();
            OracleDataAdapter adapter = new OracleDataAdapter("select storeBlob from student", conn);

adapter.Fill(dt);
            Byte[] filebyte = (byte[])(dt.Rows[1][0]);

FileStream fs = new FileStream(path, FileMode.Create);

fs.Write(filebyte, 0, filebyte.GetLength(0));

fs.Close();

MessageBox.Show("读取成功！");
        }
    }

}