.net winform openFileDialog1 显示缩略图 .FromFile(path)

关键字: oracle 数据库 blob 字段图片存储保存插入

需要打开源码

改一下数据源和表名还有字段名

C#代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
namespace ImageSaveOracleBlobDataBase
{
public partial class Form1 : Form
{
/// <summary>
/// 作者：黑色头发
/// C# WinForm操作oracle数据库的Blob字段
/// blog:http://heisetoufa.javaeye.com
/// 静网:http://www.heisetoufa.cn
/// </summary>
public Form1()
{
InitializeComponent();
}
#region 保存图片到oracle数据库
private void button1_Click(object sender, EventArgs e)
{
string cnnstr = "provider=OraOLEDB.Oracle;data source=zlkj_kk;User Id=kk;Password=kk;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{ }
OleDbCommand cmd = new OleDbCommand(cnnstr, con);
cmd.CommandType = CommandType.Text;
cmd.CommandText = cnnstr;
string imgPath = @"d:\aa\a.jpg";//图片文件所在路径
FileStream file = new FileStream(imgPath, FileMode.Open, FileAccess.Read);
Byte[] imgByte = new Byte[file.Length];//把图片转成 Byte型二进制流
file.Read(imgByte, 0, imgByte.Length);//把二进制流读入缓冲区
file.Close();
cmd.CommandText = " insert into kk.kkzp ( xh,zp ) values ('17',:zp) ";//正常sql语句插入数据库
cmd.Parameters.Add("zp", System.Data.OleDb.OleDbType.Binary, imgByte.Length);
cmd.Parameters[0].Value = imgByte;
try
{
cmd.ExecuteNonQuery();
MessageBox.Show("插入成功");
}
catch (System.Exception e1)
{
MessageBox.Show(e1.Message);
}
}
#endregion
#region 修改图片
private void button2_Click(object sender, EventArgs e)
{
string cnnstr = "provider=OraOLEDB.Oracle;data source=zlkj_kk;User Id=kk;Password=kk;";
OleDbConnection con = new OleDbConnection(cnnstr);
string imgPath = @"d:\aa\b.jpg";//图片文件所在路径
FileStream file = new FileStream(imgPath, FileMode.Open, FileAccess.Read);
Byte[] ddd = new Byte[file.Length];//把图片转成 Byte型二进制流
file.Read(ddd, 0, ddd.Length);//把二进制流读入缓冲区
file.Close();
string strSQL = "update kk.kkzp set zp=:zp where xh = '16' ";
try
{
con.Open();
}
catch
{ }
OleDbCommand cmd = new OleDbCommand(cnnstr, con);
cmd.CommandType = CommandType.Text;
cmd.CommandText = strSQL;
cmd.Parameters.Add("zp", System.Data.OleDb.OleDbType.Binary, ddd.Length).Value = ddd;
cmd.ExecuteNonQuery();
MessageBox.Show("修改成功");
}
#endregion
#region 读出数据库里图片
private void button3_Click(object sender, EventArgs e)
{
string strSQL = "select xh,zp from kk.kkzp where xh = 16 ";
string cnnstr = "provider=OraOLEDB.Oracle;data source=zlkj_kk;User Id=kk;Password=kk;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{ }
OleDbCommand cmd = new OleDbCommand(strSQL, con);
System.Data.OleDb.OleDbDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
if (dr["zp"] != DBNull.Value)//照片字段里有值才能进到方法体显示图片，否则清空pb
{
MemoryStream ms = new MemoryStream((byte[])dr["zp"]);//把照片读到MemoryStream里
Image imageBlob = Image.FromStream(ms, true);//用流创建Image
pictureBox1.Image = imageBlob;//输出图片
pictureBox1.Image.Save("d:\\abcc.jpg", pictureBox1.Image.RawFormat);
}
else//照片字段里没值，清空pb
{
pictureBox1.Image = null;
}
}
}
#endregion
#region 使文本编辑变得可见
private void button4_Click(object sender, EventArgs e)
{
textBox1.Visible = true;
button5.Visible = true;
button6.Visible = true;
button7.Visible = true;
}
#endregion
#region 保存文本
private void button5_Click(object sender, EventArgs e)
{
string cnnstr = "provider=OraOLEDB.Oracle;data source=zlkj_kk;User Id=kk;Password=kk;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{ }
OleDbCommand cmd = new OleDbCommand(cnnstr, con);
cmd.CommandType = CommandType.Text;
cmd.CommandText = cnnstr;
string txvalue = this.textBox1.Text.Trim();
//将textBox1.Text转换为二进制类型
byte[] expbyte = System.Text.Encoding.Unicode.GetBytes(txvalue);
cmd.CommandText = " insert into kk.kkzp ( xh,zp ) values ('18',:zp) ";
cmd.Parameters.Add("zp", System.Data.OleDb.OleDbType.Binary, expbyte.Length);
cmd.Parameters[0].Value = expbyte;
try
{
cmd.ExecuteNonQuery();
MessageBox.Show("插入结束");
}
catch (System.Exception e1)
{
MessageBox.Show(e1.Message);
}
}
#endregion
#region 修改文本
private void button6_Click(object sender, EventArgs e)
{
string cnnstr = "provider=OraOLEDB.Oracle;data source=zlkj_kk;User Id=kk;Password=kk;";
OleDbConnection con = new OleDbConnection(cnnstr);
byte[] ddd;
ddd = System.Text.Encoding.Unicode.GetBytes(this.textBox1.Text);
string strSQL = "update kk.kkzp set zp=:zp where xh = 18 ";
try
{
con.Open();
}
catch
{ }
OleDbCommand cmd = new OleDbCommand(cnnstr, con);
cmd.CommandType = CommandType.Text;
cmd.CommandText = strSQL;
cmd.Parameters.Add("zp", System.Data.OleDb.OleDbType.Binary, ddd.Length).Value = ddd;
cmd.ExecuteNonQuery();
MessageBox.Show("OK!");
}
#endregion
#region 读出文本
private void button7_Click(object sender, EventArgs e)
{
string strSQL = "select xh,zp from kk.kkzp where xh = 18 ";
string cnnstr = "provider=OraOLEDB.Oracle;data source=zlkj_kk;User Id=kk;Password=kk;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{ }
OleDbCommand cmd = new OleDbCommand(strSQL, con);
System.Data.OleDb.OleDbDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
//读取BLOB数据时也要将其转换回文本类型
string dd = dr["zp"].ToString();
byte[] ooo = (byte[])dr["zp"];
string str;
str = System.Text.Encoding.Unicode.GetString(ooo);
this.textBox1.Text = str;
}
}
#endregion
#region 退出
private void button8_Click(object sender, EventArgs e)
{
Application.Exit();
}
#endregion
#region 单击状态栏
private void toolStripStatusLabel2_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("http://heisetoufa.javaeye.com");
}
#endregion
}
}