C#将文件保存到Oracle的BLOB字段

• Z时代
• 2024-01-10
• 分类：综合

private void button1_Click(object sender, EventArgs e)
        {
            string cnnstr = "provider=OraOLEDB.Oracle;data source=HWQY;User Id=HWQY;Password=HWQY123;";
            OleDbConnection con = new OleDbConnection(cnnstr);
            try
            {
                con.Open();
            }
            catch
            { }
            OleDbCommand cmd = new OleDbCommand(cnnstr, con);

            cmd.CommandType = CommandType.Text;
            cmd.CommandText = cnnstr;

            string imgPath = @"c:/a.txt";//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 test(id,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);
            }  

        }

        private void button2_Click(object sender, EventArgs e)
        {
            string cnnstr = "provider=OraOLEDB.Oracle;data source=HWQY;User Id=HWQY;Password=HWQY123;";
            OleDbConnection con = new OleDbConnection(cnnstr);
            try
            {
                con.Open();
            }
            catch
            { }
            OleDbCommand cmd = new OleDbCommand(cnnstr, con);

            cmd.CommandType = CommandType.Text;
            cmd.CommandText = cnnstr;

            string imgPath = @"c:/a.txt";//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 = " update test  set id="18",zp=:zp where id="17"";//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("更新成功");
            }
            catch (System.Exception e1)
            {
                MessageBox.Show(e1.Message);
            }  

        }

        private void button3_Click(object sender, EventArgs e)
        {
            string strSQL = "select * from test where id = "18" ";
            string cnnstr = "provider=OraOLEDB.Oracle;data source=hwqy;User Id=hwqy;Password=hwqy123;";
            OleDbConnection con = new OleDbConnection(cnnstr);
            try
            {
                con.Open();
            }
            catch
            { }

            DataTable dt = new DataTable();
            System.Data.OleDb.OleDbDataAdapter da = new OleDbDataAdapter("select * from test",con);
            da.Fill(dt);
            Byte[] fileByte = (byte[])(dt.Rows[0]["zp"]);

            FileStream fsForWrite = new FileStream(@"c:/test.txt", FileMode.Create);
            fsForWrite.Write(fileByte, 0, fileByte.GetLength(0));

            fsForWrite.Close();
           

        }

注意：

连接ORACLE可以有多种形式的字符串，

// HWQY_Task.HWQY_OraHelper.strConn = "Provider=MSDAORA;pools=true;User ID=" + LinkUser + ";Data Source=" + LinkName + ";Password=" + LinkPassWord + ";";
            HWQY_Task.HWQY_OraHelper.strConn = "Provider=OraOLEDB.Oracle;pools=true;User ID=" + LinkUser + ";Data Source=" + LinkName + ";Password=" + LinkPassWord + ";";
          

但用Provider=MSDAORA的形式时，保存到BLOB将出错。只能采用Provider=OraOLEDB.Oracle的形式。

以上是 C#将文件保存到Oracle的BLOB字段 的全部内容， 来源链接： utcz.com/z/510728.html