ASP.NET Web PDF Document Viewer/Editor Control Library

We then explain the typical problems for recursive-descent parsing and introduce fsyacc by giving a parser for Kitty, a small BASIC-like language This highlights how to parse lists of symbols, how to assign precedence and associativity to your tokens and production rules, and how you can recover from parsing errors We also look at conflicts that can arise in the fsyacc specifications and how to resolve them Finally, we cover combinator-based techniques, which are particularly useful for writing parsers for binary formats, without relying on fslex and fsyacc..

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While writing to a CLOB (or BLOB), you should ensure the following: You have to first select the CLOB (or BLOB) with a for update clause to lock the row, as discussed earlier in the section Using Internal LOBs in PL/SQL. You must ensure that you have set autocommit to false in the connection you use. You should do this anyway to preserve transaction semantics (see the section Sizing Your Transaction Resources According to Your Business Needs in 4 for a detailed discussion on this topic). If you don t set autocommit to false, the database issues a commit right after the first select for update that you do to acquire the lock on LOB. The commit, of course, releases the lock, and you get a fetch out of sequence error when you try to write anything to the LOB later.

There are a lot of details to keep in mind when you re using component services. While a comprehensive discussion of the details of contexts, COM Interop, and an exhaustive list of best practices is out of scope for the summary we present in this chapter, we advise you keep some simple things in mind as you move into development in this space.

Lexical analysis is concerned with identifying those tokens that make up a given input. A token is simply a piece of the input text that constitutes a word from the lexer s perspective. This can be a number, an identifier, a special word, or any sequence of characters deemed to make a unit. During syntax analysis you check whether the input (a series of tokens) is structured according to a set of grammar rules that makes up your language. For instance, the F# construct let a = b*2 in .. is syntactically correct, but it is a semantically valid expression only if the variable b is bound in the preceding scope. The notion of scope and binding depends on the semantics of your language, and these are the topics of interest for semantic analysis. In a typical compiler, for instance, source programs go through the following stages: Lexing Parsing Semantic Analysis Optimization(s)/Transformations Code Generation We cover examples of semantic analysis and optimization/transformation in s 9 and 11.

As of Oracle 10g Release 1, you need to use the Oracle extension oracle.sql.CLOB to write the data, as the following standard methods in the Clob interface are not supported and give rise to an Unsupported feature exception. Note that at the time of this writing, Oracle 10g Release 1 documentation is incorrect in this regard. public OutputStream setAsciiStream( long pos ) throws SQLException Retrieves a stream to be used to write Ascii characters to the CLOB value that this Clob object represents, starting at position pos. public Writer setCharacterStream( long pos ) throws SQLException Retrieves a stream to be used to write a stream of Unicode characters to the CLOB value that this Clob object represents, at position pos. Since the preceding two methods in the Clob interface are not supported, the alternative is to use either of the following two Oracle extension methods in the CLOB class: public OutputStream getAsciiOutputStream() throws SQLException public Writer getCharacterOutputStream() throws SQLException We will use the second method in our example. Continuing with the code in our DemoClobOperations class, let s now look at the method _writeClob(), which demonstrates this concept: private static void _writeClob( Connection conn ) throws SQLException, IOException { PreparedStatement pstmt = null; ResultSet rset = null; Writer writer= null; //OutputStream writer = null; try { String stmtString = "select clob_col from clob_table " + " where id = for update"; pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, 2 ); rset = pstmt.executeQuery(); while( ) { In this case, we cast the returned object into the oracle.sql.CLOB interface type: CLOB clob = (CLOB)rset.getClob( 1 ); We replace the first characters of the CLOB column with the following String: String newClobData = new String("NEW CLOB DATA");

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