Simple .NET/ASP.NET PDF document editor web control SDK

We next open the CLOB. Opening and closing of LOBs in general improves performance when you do multiple writes to the LOB: tempClob.open( CLOB.MODE_READWRITE); We next get the chunk size and initialize a byte array of a size equal to the chunk size with the character b : int chunkSize = tempClob.getChunkSize(); System.out.println("chunk size for temporary lob: " + chunkSize); byte[] buffer = new byte[ chunkSize ]; Arrays.fill( buffer, 0, chunkSize, (byte)'b' ); Then we initialize the OutputStream. In 10g, the standard method in the Clob interface works. In 9i, you have to use the Oracle extension method getAsciiOutputStream() in the CLOB interface: out = tempClob.setAsciiStream( 0L ); // In 9i, you would have to use the following method instead // of setAsciiStream() // out = tempClob.getAsciiOutputStream(); We go in a loop and write data equal to ten chunks. Subsequently, we use the method setClob() to set the temporary CLOB value and insert it into the table: for( int i=0; i < 10; i++ ) { out.write( buffer, 0, chunkSize ); } pstmt = conn.prepareStatement( insertStmt ); pstmt.setString( 1, "Using temporary clob" ); pstmt.setInt( 2, 4 ); pstmt.setClob( 3, tempClob ); pstmt.executeUpdate(); } finally { try { if( out != null ) out.close(); if( ( tempClob != null ) ) CLOB.freeTemporary( tempClob ); } catch (Exception e) { e.printStackTrace(); } JDBCUtil.close( pstmt); } } }// end of program Notice how we use the freeTemporary() method in the finally clause to free the temporary CLOB.

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You ve seen how you can read from a file (text or binary) using a BFILE in PL/SQL or JDBC. You can also use a BFILE along with the DBMS_LOB package to load a text or binary file directly into a CLOB or BLOB and access them from PL/SQL or JDBC. There are two alternatives to using a BFILE for file manipulations: Use the UTL_FILE package. The first alternative is to use the supplied PL/SQL package UTL_FILE to read from and write to a text or binary file accessible on a database server (remember, BFILEs do not allow you to write to a file; you can use the UTL_FILE package to work around that). Use external tables. The second alternative that allows you to read from an operating system text file directly using select statements is to use external tables. Note that you can only do a read using this alternative, and that too only on text files. Both alternatives are Oracle-specific solutions and fall outside the scope of the JDBC API. However, since they form an alternative to the actual problem of file operations being achieved by the BFILE, I mention them briefly here.

System; System.Drawing; System.Drawing.Imaging; System.Web;

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With the UTL_FILE package, PL/SQL programs (and JDBC programs that invoke these PL/SQL programs) can read from and write to text or binary files accessible to the database server. We will go through only a few subprograms of this package that allow us to read and write to a file. Please consult PL/SQL Packages and Types Reference (10g Release 1) (available from http://otn.oracle.com) for a detailed description of the package capabilities.

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public class DomHandler : IHttpHandler { public DomHandler() {} public bool IsReusable { get { return true; } } public void ProcessRequest(HttpContext context) { string s; Bitmap bm; s = context.Request.Url.AbsolutePath; int iPos = s.LastIndexOf("/"); s = s.Substring(iPos + 1, s.Length - 5 - iPos); bm = new Bitmap(30 + s.Length * 13, 50); Graphics g = Graphics.FromImage(bm); g.FillRectangle(Brushes.Goldenrod, 0, 0, bm.Width, bm.Height); s = context.Server.UrlDecode(s); g.DrawString(s, new Font("Verdana", 18, FontStyle.Bold), Brushes.Blue, 20, 10); bm.Save(context.Response.OutputStream, ImageFormat.Jpeg); } } Notice there are no dependencies within the code that this handler be mapped to *.dom. At this point, it could be mapped to any URL pattern. To associate the handler with all DOM extensions, you must use the Microsoft Management Console (MMC) snap-in for IIS. Go to the Properties dialog box for the web application. On the Virtual Directory tab, click the Configuration button in the Application Settings section. A list of the mappings for all extensions appears, as shown in Figure 2-15.

Note In the past, accessible directories for the UTL_FILE functions were specified in the initialization file using the UTL_FILE_DIR parameter. However, for Oracle9i and 10g, I recommend that you use the CREATE DIRECTORY feature, which replaces UTL_FILE_DIR. Directory objects offer more flexibility and granular control to the UTL_FILE application administrator and, more important, they can be maintained dynamically (i.e., without shutting down the database).

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