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The parameters are as follows: fid: The file ID. r: The raw binary data. len: The number of bytes read from the file. The default is null, in which case it is assumed to be the maximum length of RAW. PUT_RAW: This function accepts as input a RAW data value and writes the value to the output buffer. The syntax is UTL_FILE.PUT_RAW ( fid IN utl_file.file_type, r IN RAW, autoflush IN BOOLEAN DEFAULT FALSE); The parameters are as follows: fid: The file ID. r: The raw binary data. autoflush: If true, this parameter performs a flush after writing the value to the output buffer. The default is false. In the following example, we open the GIF image in the file image.gif in the directory C:\TEMP, read it into the raw buffer, and write it back to another file called image1.gif that we open in write mode. Notice that we use 'RB' to open the first file in read byte mode and 'WB' to open the second file in write byte mode. benchmark@ORA10G> declare 2 l_buffer raw(32767); 3 l_input_file utl_file.file_type; 4 l_output_file utl_file.file_type; 5 begin 6 l_input_file := utl_file.fopen( 'MY_DIR', 'image.gif', 'RB', 7 256 ); 8 l_output_file := utl_file.fopen( 'MY_DIR', 'image1.gif', 'WB', 9 256 ); 10 loop 11 utl_file.get_raw( l_input_file, l_buffer ); 12 utl_file.put_raw( l_output_file, l_buffer ); 13 --dbms_output.put_line( utl_raw.cast_to_varchar2(l_buffer) ); 14 end loop; 15 exception 16 when no_data_found then 17 utl_file.fclose( l_input_file ); 18 utl_file.fclose( l_output_file ); 19 end; 20 / PL/SQL procedure successfully completed.

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lexeme lexbuf)) lexbuf } Comment processing begins when you encounter (* in the token rule When the closing *) is encountered, you exit one invocation of the comment rule The idea is that you deal with nested comments by recursively applying the lexer when a nested comment is reached Note the double invocation of comment lexbuf for nested comment delimiters: once to tokenize the comment that belongs to the opener and again to tokenize the rest of the enclosing comment There are also two further matches within the comment rule If you hit the end of the source stream, you have an unterminated comment and you raise an exception, and in every other case you move forward inside the comment In the example, strings are also handled by a separate lexer rule string that is invoked by the token lexer when you encounter the double-quote character.

Figure 3-1. The Page object s ancestors and descendants (when you re using the code-behind model)

The external table feature (introduced in 9i) gives you the ability to query a flat file using a select statement. It is typically used to load huge amounts of data from files to tables in a data warehouse system. It can, however, be very useful in reading text data from PL/SQL or, for that matter, using JDBC. We ll go through a small example to read a text file, but you ll need to read through the Oracle documentation (see Oracle Database SQL Reference [10g Release 1]) for the detailed capabilities and options available with the external table feature. Just to emphasize again, you can use this feature only with text files, and you can only read from the operating system files you cannot write to them using external tables. First, we need to create a directory object in which our file exists as follows: benchmark@ORA10G> create or replace directory my_dir as 'C:\TEMP'; Directory created. Our example file, et_data.txt, exists in this directory and contains employee ID and employee number fields for some employees: 1, 2, 3, 4, 'Varun Menon' 'Chaandni Sneha' 'John Edgar' 'Jones Poe' We now create an external table that points to the preceding file as follows: benchmark@ORA10G> create table my_emp_et 2 ( 3 empno number, 4 ename varchar2(20) 5 ) 6 organization external 7 ( 8 type oracle_loader 9 default directory my_dir 10 access parameters 11 ( 12 fields terminated by ',' 13 optionally enclosed by "'" 14 missing field values are null 15 ) 16 location( 'et_data.txt' ) 17 ); Table created.

This rule takes two parameters: the string consumed so far and the start position of the string The latter is used to report a nicer error for an unterminated string (note you could also use this technique for the matching case for comments) You can also check whether you have an escaped character in the input..

The organization external keyword tells Oracle that this table actually is an external table. The default directory option specifies my_dir to be the directory under which the file for this table exists. The next three lines specify that the fields are terminated by a comma (,) are optionally enclosed by a single quote ('), and any fields that are missing should be treated as null. Finally, the location option specifies the file name to be et_data.txt. We are now ready to run a normal select on this table as follows: benchmark@ORA10G> select * from my_emp_et; EMPNO ---------1 2 3 4 ENAME -------------------Varun Menon Chaandni Sneha John Edgar Jones Poe