.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

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
    }
}