USING LOBs AND BFILEs in Font

Create Code39 in Font USING LOBs AND BFILEs

CHAPTER 12 USING LOBs AND BFILEs
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-- open the file in write mode -- create one if -- file does not exist. l_file_handle := utl_file.fopen( 'MY_DIR', 'my_file.txt', 'W', 256 ); for i in 1 .. 10 loop utl_file.put_line( l_file_handle, 'my line number ' || i ); dbms_output.put_line( l_buffer ); end loop; utl_file.fclose( l_file_handle ); exception when others then raise; end; / Our newly created file, my_file.txt, in the directory C:\TEMP looks as follows:
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Using the UTL_FILE PL/SQL Package to Read from and Write to a Binary File
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We will use the functions get_raw() and put_raw() described in this section for reading from and writing to a binary file.
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Note The RAW data type stores data that is not to be interpreted (i.e., not explicitly converted when moving data between different systems) by the Oracle database. These data types are intended for binary data or byte strings.
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GET_RAW: This function reads a RAW value from a file and adjusts the file pointer ahead by the number of bytes read. It ignores line terminators and returns the actual number of bytes requested by the len parameter. The syntax is UTL_FILE.GET_RAW (fid IN utl_file.file_type, r OUT NOCOPY RAW,len IN PLS_INTEGER DEFAULT NULL);
CHAPTER 12 USING LOBs AND BFILEs
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.
CHAPTER 12 USING LOBs AND BFILEs
Using External Tables to Read Text Files
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.
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