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// testblob.cs - tests loading a binary file into an oracle blob and vice-versa
using System;
using System.Data;
using System.Data.OracleClient;
using System.Text;
using System.IO;
class TestBlob
{
static string infilename = @"mono-win32-setup-dark.bmp";
static string outfilename = @"mono-win32-setup-dark2.bmp";
static string connectionString = "Data Source=palis;User ID=scott;Password=tiger";
public static void Main (string[] args)
{
OracleConnection con = new OracleConnection();
con.ConnectionString = connectionString;
con.Open();
BLOBTest (con);
ReadBlob (con);
con.Close();
con = null;
}
// read the BLOB into file "cs-parser2.cs"
public static void ReadBlob (OracleConnection connection)
{
if (File.Exists(outfilename) == true) {
Console.WriteLine("Filename already exists: " + outfilename);
return;
}
OracleCommand rcmd = connection.CreateCommand ();
rcmd.CommandText = "SELECT BLOB_COLUMN FROM BLOBTEST";
OracleDataReader reader2 = rcmd.ExecuteReader ();
if (!reader2.Read ())
Console.WriteLine ("ERROR: RECORD NOT FOUND");
Console.WriteLine (" TESTING OracleLob OBJECT 2...");
OracleLob lob2 = reader2.GetOracleLob (0);
Console.WriteLine (" LENGTH: {0}", lob2.Length);
Console.WriteLine (" CHUNK SIZE: {0}", lob2.ChunkSize);
byte[] lobvalue = (byte[]) lob2.Value;
FileStream fs = new FileStream(outfilename, FileMode.CreateNew);
BinaryWriter w = new BinaryWriter(fs);
w.Write(lobvalue);
w.Close();
fs.Close();
lob2.Close ();
reader2.Close ();
}
public static void BLOBTest (OracleConnection connection)
{
Console.WriteLine (" BEGIN TRANSACTION ...");
OracleTransaction transaction = connection.BeginTransaction ();
Console.WriteLine (" Drop table BLOBTEST ...");
try {
OracleCommand cmd2 = connection.CreateCommand ();
cmd2.Transaction = transaction;
cmd2.CommandText = "DROP TABLE BLOBTEST";
cmd2.ExecuteNonQuery ();
}
catch (OracleException oe1) {
// ignore if table already exists
}
Console.WriteLine (" CREATE TABLE ...");
OracleCommand create = connection.CreateCommand ();
create.Transaction = transaction;
create.CommandText = "CREATE TABLE BLOBTEST (BLOB_COLUMN BLOB)";
create.ExecuteNonQuery ();
Console.WriteLine (" INSERT RECORD ...");
OracleCommand insert = connection.CreateCommand ();
insert.Transaction = transaction;
insert.CommandText = "INSERT INTO BLOBTEST VALUES (EMPTY_BLOB())";
insert.ExecuteNonQuery ();
OracleCommand select = connection.CreateCommand ();
select.Transaction = transaction;
select.CommandText = "SELECT BLOB_COLUMN FROM BLOBTEST FOR UPDATE";
Console.WriteLine (" SELECTING A BLOB (Binary Large Object) VALUE FROM BLOBTEST");
OracleDataReader reader = select.ExecuteReader ();
if (!reader.Read ())
Console.WriteLine ("ERROR: RECORD NOT FOUND");
Console.WriteLine (" TESTING OracleLob OBJECT ...");
OracleLob lob = reader.GetOracleLob (0);
Console.WriteLine (" LENGTH: {0}", lob.Length);
Console.WriteLine (" CHUNK SIZE: {0}", lob.ChunkSize);
try {
if (File.Exists(infilename) == false) {
Console.WriteLine("Filename does not exist: " + infilename);
return;
}
FileStream fs = new FileStream(infilename, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(fs);
byte[] bytes = null;
int bufferLen = 8192;
bytes = r.ReadBytes (bufferLen);
while(bytes.Length > 0) {
Console.WriteLine("byte count: " + bytes.Length.ToString());
lob.Write (bytes, 0, bytes.Length);
if (bytes.Length < bufferLen)
break;
bytes = r.ReadBytes (bufferLen);
}
r.Close();
fs.Close ();
}
catch (Exception e) {
Console.WriteLine("The file could not be read:");
Console.WriteLine(e.Message);
}
lob.Close ();
Console.WriteLine (" CLOSING READER...");
reader.Close ();
transaction.Commit ();
}
}
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