Insertar blob en la base de datos Oracle con C#

Question

Tengo que mantener un .csv en mi base de datos, pero para una aplicación más comprobable prefiero no usar procedimientos. Básicamente, solo genero un archivo y la siguiente instrucción se coloca en la base de datos.

¿Alguien tiene alguna pista sobre la mejor manera de hacer esto en el código?

Answer 1

Aquí hay un ejemplo para insertar datos de blobs en Oracle usando C# y procedimientos (usted dice que prefiere eso significa que puede).

using System; 
using System.Data; 
using Oracle.DataAccess.Client; 
using Oracle.DataAccess.Types; 
using System.IO; 
using System.Text; 

//Step 1 
// Connect to database 
// Note: Modify User Id, Password, Data Source as per your database setup 
string constr = "User Id=Scott;Password=tiger;Data Source=orcl9i"; 

OracleConnection con = new OracleConnection(constr); 
con.Open(); 
Console.WriteLine("Connected to database!"); 

// Step 2 
// Note: Modify the Source and Destination location 
// of the image as per your machine settings 
String SourceLoc = "D:/Images/photo.jpg"; 
String DestinationLoc = "D:/Images/TestImage.jpg"; 

// provide read access to the file 

FileStream fs = new FileStream(SourceLoc, FileMode.Open,FileAccess.Read); 

// Create a byte array of file stream length 
byte[] ImageData = new byte[fs.Length]; 

//Read block of bytes from stream into the byte array 
fs.Read(ImageData,0,System.Convert.ToInt32(fs.Length)); 

//Close the File Stream 
fs.Close(); 

// Step 3 
// Create Anonymous PL/SQL block string 
String block = " BEGIN " + 
       " INSERT INTO testblob (id, photo) VALUES (100, :1); " + 
       " SELECT photo into :2 from testblob WHERE id = 100; " + 
       " END; "; 

// Set command to create Anonymous PL/SQL Block 
OracleCommand cmd = new OracleCommand(); 
cmd.CommandText = block; 
cmd.Connection = con; 


// Since executing an anonymous PL/SQL block, setting the command type 
// as Text instead of StoredProcedure 
cmd.CommandType = CommandType.Text; 

// Step 4 
// Setting Oracle parameters 

// Bind the parameter as OracleDbType.Blob to command for inserting image 
OracleParameter param = cmd.Parameters.Add("blobtodb", OracleDbType.Blob); 
param.Direction = ParameterDirection.Input; 


// Assign Byte Array to Oracle Parameter 
param.Value = ImageData; 

// Bind the parameter as OracleDbType.Blob to command for retrieving the image 
OracleParameter param2 = cmd.Parameters.Add("blobfromdb", OracleDbType.Blob); 
param2.Direction = ParameterDirection.Output; 

// Step 5 
// Execute the Anonymous PL/SQL Block 

// The anonymous PL/SQL block inserts the image to the 
// database and then retrieves the images as an output parameter 
cmd.ExecuteNonQuery(); 
Console.WriteLine("Image file inserted to database from " + SourceLoc); 

// Step 6 
// Save the retrieved image to the DestinationLoc in the file system 

// Create a byte array 
byte[] byteData = new byte[0]; 

// fetch the value of Oracle parameter into the byte array 
byteData = (byte[])((OracleBlob)(cmd.Parameters[1].Value)).Value; 

// get the length of the byte array 
int ArraySize = new int(); 
ArraySize = byteData.GetUpperBound(0); 

// Write the Blob data fetched from database to the filesystem at the 
// destination location 
FileStream fs1 = new FileStream(@DestinationLoc, 
           FileMode.OpenOrCreate, FileAccess.Write); 
fs1.Write(byteData, 0,ArraySize); 
fs1.Close(); 

Console.WriteLine("Image saved to " + DestinationLoc + " successfully !"); 
Console.WriteLine(""); 
Console.WriteLine("***********************************************************"); 
Console.WriteLine("Before running this application again, execute 'Listing 1' "); 

Answer 2

private void btnSave_Click(object sender, EventArgs e) 
    { 
     try 
     { 
      //Read Image Bytes into a byte array 
      byte[] blob = ReadFile(txtPath.Text); 

      //Initialize Oracle Server Connection 
      con = new OracleConnection(conString); 

      //Set insert query 
      string qry = "insert into Imgpn (imgpath,photo) values('" + txtPath.Text + "'," + " :BlobParameter)"; 
      OracleParameter blobParameter = new OracleParameter(); 
      blobParameter.OracleType = OracleType.Blob; 
      blobParameter.ParameterName = "BlobParameter"; 
      blobParameter.Value = blob; 

      //Initialize OracleCommand object for insert. 
      cmd = new OracleCommand(qry, con); 

      //We are passing Name and Blob byte data as Oracle parameters. 
      cmd.Parameters.Add(blobParameter); 

      //Open connection and execute insert query. 
      con.Open(); 
      cmd.ExecuteNonQuery(); 

      MessageBox.Show("Image added to blob field"); 
      GetImagesFromDatabase(); 
      cmd.Dispose(); 
      con.Close(); 
      //this.Close(); 

     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.ToString()); 
     } 
    } 
    byte[] ReadFile(string sPath) 
    { 
     //Initialize byte array with a null value initially. 
     byte[] data = null; 

     //Use FileInfo object to get file size. 
     FileInfo fInfo = new FileInfo(sPath); 
     long numBytes = fInfo.Length; 

     //Open FileStream to read file 
     FileStream fStream = new FileStream(sPath, FileMode.Open, FileAccess.Read); 

     //Use BinaryReader to read file stream into byte array. 
     BinaryReader br = new BinaryReader(fStream); 

     //When you use BinaryReader, you need to supply number of bytes to read from file. 
     //In this case we want to read entire file. So supplying total number of bytes. 
     data = br.ReadBytes((int)numBytes); 
     return data; 
    } 
    void GetImagesFromDatabase() 
    { 
     try 
     { 
      //Initialize Oracle connection. 
      con = new OracleConnection(conString); 
      //MessageBox.Show("Connection Successfull"); 
      //Initialize Oracle adapter. 
      OracleDataAdapter oda = new OracleDataAdapter("Select * from Imgpn", con); 

      //Initialize Dataset. 
      DataSet DS = new DataSet(); 

      //Fill dataset with ImagesStore table. 
      oda.Fill(DS, "Imgpn"); 

      //Fill Grid with dataset. 

      dataGridView1.DataSource = DS.Tables["Imgpn"]; 
      // 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.ToString()); 
     } 
    } 

aquí es la forma sencilla de insertar una imagen en ane base de datos Oracle recuperar espectáculo ane en DataGridView