使用C＃在oracle数据库中插入blob

我必须在我的数据库中保留.csv，但对于更可测试的应用程序，我更喜欢不使用过程。 基本上我只生成一个文件，下一条指令放在数据库中。

有人在代码中有一些关于最佳方法的线索吗？

Answer 1

这是一个使用c＃和过程在oracle中插入blob数据的示例（你说更喜欢这意味着你可能）。

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()); } } 

这里是将数据插入到oracle数据库中的简单方法。在datagridview中检索显示