.NET/Java PDF, Tiff, Barcode SDK Library

Note This model changed from Beta 1 to Beta 2. If you ve played around with, or have read up on, the

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Of limited use in JDBC if you want to read a file. Since there is no JDBC type corresponding to the file handle record type used by UTL_FILE, you will have to create a wrapper. Also, you will need to do multiple server calls per read while invoking the UTL_FILE.GET_LINE function, which can be a performance bottleneck. It works well in PL/SQL, as there are no round-trips involved.

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You can turn the fslex-generated lexer for the lexer specification in Listing 16-3 into a tokenStream using the following code: let tokenStream inp : tokenStream = // Generate the token stream as a seq<token> seq { let lexbuf = Lexing.from_string inp while not lexbuf.IsPastEndOfStream do match SimpleTokensLex.token lexbuf with | EOF -> yield! [] | token -> yield (token, lexbuf.StartPos, lexbuf.EndPos) } // Convert to a lazy list |> LazyList.of_seq let parse input = let src = tokenStream input let result, src = parsePolynomial src match tryToken src with | Some _ -> failwith "unexpected input at end of token stream!" | None -> result These functions have the following types: val tokenStream: string -> tokenStream val parse: string -> polynomial Note in the previous examples that you can successfully parse either constants or complete terms, but once you locate a HAT symbol you insist on having a number following. This sort of parsing, when you look only at the next token to guide the parsing process is referred to as LL(1), which stands for Left-to-right, Leftmost derivation parsing, where 1 means that only one look-ahead symbol is used. The parser approach we used earlier is called recursive-descent. This has various advantages and disadvantages, and we will be discussing those in a bit. To conclude here, you can look at the parse function in action: > parse "1+3";; val it : polynomial = [Const 1; Const 3] > parse "2x^2+3x+5";; val it : polynomial = [Term (2,"x",2); Term (3,"x",1); Const 5]

We ll now run a performance comparison between using BFILE and external tables to read a text file. (Using UTL_FILE is too cumbersome and is usually not a good option anyway, due to reasons mentioned in Table 12-2, so we won t bother to use UTL_FILE in this comparison.) First, we create the schema and the data on which the benchmark will run. We create the directory that will contain the benchmark file. benchmark@ORA10G> create or replace directory my_dir as 'C:\TEMP'; Directory created. Since you are now an expert in UTL_FILE, for fun let s create the benchmark file using the following UTL_FILE program: benchmark@ORA10G> declare 2 l_buffer varchar2(32767); 3 l_file_handle utl_file.file_type; 4 begin 5 -- open the file in write mode -- create one if 6 -- file does not exist. 7 8 l_file_handle := utl_file.fopen( 'MY_DIR', 'benchmark_input.txt', 'W',

Framework changes with the PDC Bits, or Beta 1, you ll have a different story for the changes to the page model than the one we present here. People hated the PDC Bits model, so Microsoft changed it with the release of Beta 2. It reverted the model to look much more like the one in version 1.x.

You can and always should verify the actual result set type and concurrency type by using the following two methods in the ResultSet interface (both throw a SQLException): int getType(): This method returns an int value for the result set type used for the query. int getConcurrency(): This method returns an int value for the concurrency type used for the query.