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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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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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Filtering for Sum If you select Sum in the third drop-down list, items with the highest or lowest grand total amounts, that total at least the specified sum, are displayed when you apply the filter In the FoodSalesxlsx example, if you selected to show the Top 100,000 Sum, when you apply the filter, you can see the products with the highest grand totals for units sold, that combine to total at least 100,000 units sold Only two products, Potato Chips and Saltines, are returned in the filter, because these two have combined sales of 123,458..

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

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benchmark@ORA10G> select empno, ename 2 from my_emp_et 3 where empno <= 3; EMPNO ---------1 2 3 ENAME -------------------Varun Menon Chaandni Sneha John Edgar

Figure 11-6 The class diagram of the system s top-level classes The class diagram looks incomplete, because there are no relationships between any of the classes I didn t forget the relationships: There simply are none I designed the system so that all its top-level classes are decoupled from each other The only classes missing from the diagram are those related to the infrastructure: the LifecycleCoordinators, the builder, and the binder, which I ll discuss shortly The classes are all pretty simple, but the class diagram tells you almost nothing about how the system is really structured, because you can t see how the parts interact when the system is running A more useful way to show the system is with a wiring diagram, as shown in Figure 11-7 The diagram depicts the system in the cruising state, which is the normal running state entered after system startup.

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