ASP.NET Web PDF Document Viewer/Editor Control Library

What if we need to append data to the end of a BLOB We ve already seen how to do that for a CLOB by invoking the method dbms_lob.writeappend from JDBC. We do the same for a BLOB, with minor variations: this time, we need to pass an array of bytes using the setBytes() method of the CallableStatement object. The final method, _appendToBlob, of the class DemoBlobOperations does this: /* demos how to append to a BLOB in the database. */ private static void _appendToBlob( Connection conn ) throws SQLException, IOException { CallableStatement cstmt = null; try { Once again, we declare an anonymous PL/SQL block that takes three parameters. The first parameter is the ID of the row in the table blob_table. The second parameter is the number of bytes to append (the length of the string). And the third parameter is the string to append. Notice how we use the dbms_lob.writeappend method to accomplish our task (please see PL/SQL Packages and Types Reference [10g Release 1] for more details on this method). We set all three parameters and invoke the procedure: String stmtString = "declare " + " l_blob blob;" +

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It s possible to create a type that implements the IHttpHandler interface and have it respond to any pattern of URL. The advantage is you have full control over the URL, and the URL of the request doesn t need to correspond to a physical file. The downside is that IIS configuration is required to map the URL into the framework, and ASP .NET configuration is required to map the URL to your specific handler. The alternative is to use the built-in, simple handler factory. This handler is mapped to files with an ASHX extension. The WebHandler directive is used to point an ASHX page at a type that implements the IHttpHandler interface. Visual Studio adds a file with this directive to your project via the Generic Handler option in the Add New Item dialog window.

Makes a lexbuf for the given string Makes a lexbuf for the given text reader Makes a lexbuf for the given binary reader Returns the matched string Gets/sets the current position associated with the end of the matched token True if the lex buffer has exhausted the available input Gets/sets the current position associated with the start of the matched token

"begin " + " select blob_col into l_blob from blob_table " + " where id = and rownum <= 1 for update;" + " dbms_lob.writeappend( l_blob, , ); " + "end;"; String newBlobData = new String("data to be appended"); byte[] byteArray = newBlobData.getBytes(); cstmt = conn.prepareCall( stmtString ); cstmt.setInt( 1, 1 ); cstmt.setInt( 2, byteArray.length ); cstmt.setBytes( 3, byteArray ); cstmt.execute(); } finally { JDBCUtil.close( cstmt); } } } After the _appendToBlob method is executed, the string data to be appended gets appended to the end of the BLOB column: benchmark@ORA10G> select utl_raw.cast_to_varchar2( blob_col) blob_col 2 from blob_table; BLOB_COL ----------------------------------------------------------------------------------------------------------------------------data to overwrite existing data in the beginning line number 3. This is the final line. data to be appended In the next section, we ll look at how to read data stored in a BFILE column.

Figure 2-13. The simple handler project item in the Add New Item dialog window The code template included for this file is a complete implementation of a handler, albeit not a very dramatic one. This code gets an image from the database and returns it as a binary stream. It also caches the images for 60 seconds, instead of going to the database for them on each request. <%@ WebHandler Language="C#" Class="MyHandler" %> using using using using using using System; System.Web; System.Web.Caching; System.Configuration; System.Data; System.Data.SqlClient;

To demonstrate how to read BFILE data, we first create a table, bfile_table, with a column of type BFILE: benchmark@ORA10G> create table bfile_table 2 ( 3 x varchar2(30), 4 id number, 5 bfile_col bfile 6 ); Table created.

Note FsLex works by constructing a table-driven finite automaton that is executed to consume the input