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

Notice that the ProcessRequest method gets an instance of HttpContext passed in as an argument. This is where all details of the request are revealed to the handler, where Session and Cache can be used, and where the response is streamed back to IIS. This handler can now be used from the src attribute of an image element. The advantage here is a much lighter-weight implementation, as none of the overhead of the page s life cycle is incurred. You ll also realize greater performance by using the Cache. The last option we ll examine is creating a handler from scratch. This can be done by any type that implements the IHttpHandler interface. Without the ASHX factory to decide at runtime what type to create, some configuration entries will be necessary. For the final example, we ll show you how to handle all requests coming in for resources with the DOM extension. Because you re relying on configuration to map requests to your handler, and not on a physical resource, the filename can actually be used to some other ends. In this example, the filename is used as text that will be painted onto an image. It will be built so the resource can be used as the src attribute of an img element. <p>This handler can be embedded into a page</p> <img src='This is the handler.dom'> <img src='The handler is a parrot.dom'> And this static markup dynamically generates the image in Figure 2-14.

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Character constants; in single quotes such as '+' and '.' Character sets; matches any character in the given set Character ranges; matches any character in the given range, in ASCII ordering Complementary character sets; matches any character except those in the given character set Matches the given string of characters Matches any character Matches the end of the stream A predefined named regular expression (named earlier in the file using a let binding) Zero or one occurrences of pattern One of more occurrences of pattern Zero or more occurrences of pattern Either pattern1 or pattern Concatenation; pattern1 followed by pattern2

Now you know what temporary LOBs are and how to use them to store transient data in PL/SQL. In this section, we will create a temporary CLOB in JDBC and insert the value in a table. To create a temporary CLOB, we use the static method createTemporary() defined in the BLOB and CLOB classes. The signature of this method in the CLOB and BLOB classes is as follows: public static oracle.sql.CLOB createTemporary(Connection conn, boolean isCached, int duration) public static oracle.sql.BLOB createTemporary(Connection conn, boolean isCached, int duration) The duration must be either DURATION_SESSION or DURATION_CALL as defined in the BLOB or CLOB class. In client applications, DURATION_SESSION is appropriate. DURATION_CALL is relevant mainly in Java stored procedures. After we have finished using the temporary LOB, we should free it with the freeTemporary() method defined in BLOB and CLOB classes: public void freeTemporary() We will now create a temporary CLOB and insert it into clob_table. The following DemoTemporaryLobs class illustrates this: /** This program demonstrates how to use temporary LOBs. * We work with temporary CLOBs, though the same concepts also * apply to temporary BLOBs. * COMPATIBLITY NOTE: In 9i you have to use the method * getAsciiOutputStream() in the CLOB interface instead of the * standard setAsciiStream() method as explained in the code: */ import java.util.Arrays; import java.sql.SQLException;

Listing 16-3 shows a lexer that constructs a list of tokens that then is printed. It can recognize integers, floats, identifiers, and the symbols ^, *, -, and +. Any other character will cause a runtime exception. Listing 16-3. simpleTokensLex.fsl: Lexing Simple Tokens: Integers, Floats, and Identifiers { type token = | INT | FLOAT | ID | STRING | PLUS | | EOF } let let let let let

import java.sql.Connection; import java.io.OutputStream; import java.io.IOException; import java.sql.PreparedStatement; import oracle.sql.CLOB; import book.util.JDBCUtil; import book.util.Util; class DemoTemporaryLobs { The main() method simply invokes the method _insertClobUsingTemporaryClob() and commits. The method _insertClobUsingTemporaryClob() creates a temporary CLOB and inserts it into the table clob_table: public static void main(String args[]) throws Exception { Util.checkProgramUsage( args ); Connection conn = null; try { // get connection (autocommit is set to false) conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); _insertClobUsingTemporaryClob( conn ); conn.commit(); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( conn ); } } In the method _insertClobUsingTemporaryClob(), we first declare variables before the try catch block begins: /* demos how to insert a CLOB using temporary CLOBs. */ private static void _insertClobUsingTemporaryClob( Connection conn ) throws SQLException, IOException { String insertStmt = "insert into clob_table(x, id, clob_col) " + " values( , , ) "; PreparedStatement pstmt = null; OutputStream out = null; CLOB tempClob = null; try { We invoke the method createTemporary() to create a temporary CLOB: tempClob = CLOB.createTemporary( conn, true, CLOB.DURATION_SESSION );

Figure 2-14. A page using an image-generating handler The class that generates the image implements the IHttpHandler interface but it has no WebHandler directive. It s often a class file that lives in the App_Code directory, but it can also be a class in a standalone assembly that a project adds a reference to.