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CHAPTER 15 DATA LOADING AND UNLOADING
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attribute (a complex object type, nested table, and so on) will not work with this simple implementation. The following is a 90 percent solution, meaning it solves the problem 90 percent of the time. ops$tkyte@ORA10G> create or replace package body unloader 2 as 3 4 5 g_theCursor integer default dbms_sql.open_cursor; 6 g_descTbl dbms_sql.desc_tab; 7 g_nl varchar2(2) default chr(10); 8 These are some global variables used in this package body. The global cursor is opened once, the first time we reference this package, and it will stay open until we log out. This avoids the overhead of getting a new cursor every time we call this package. The G_DESCTBL is a PL/SQL table that will hold the output of a DBMS_SQL.DESCRIBE call. G_NL is a newline character. We use this in strings that need to have newlines embedded in them. We do not need to adjust this for Windows UTL_FILE will see the CHR(10) in the string of characters and automatically turn that into a carriage return/linefeed for us. Next, we have a small convenience function used to convert a character to hexadecimal. It uses the built-in functions to do this: 9 10 11 12 13 14 15 function to_hex( p_str in varchar2 ) return varchar2 is begin return to_char( ascii(p_str), 'fm0x' ); end;
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Finally, we create one more convenience function, IS_WINDOWS, that returns TRUE or FALSE depending on if we are on the Windows platform, and therefore the end of line is a twocharacter string instead of the single character it is on most other platforms. We are using the built-in DBMS_UTILITY function, GET_PARAMETER_VALUE, which can be used to read almost any parameter. We retrieve the CONTROL_FILES parameter and look for the existence of a \ in it if we find one, we are on Windows: 16 17 18 19 20 21 22 23 24 25 26 function is_windows return boolean is l_cfiles varchar2(4000); l_dummy number; begin if (dbms_utility.get_parameter_value( 'control_files', l_dummy, l_cfiles )>0) then return instr( l_cfiles, '\' ) > 0; else return FALSE; end if;
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CHAPTER 15 DATA LOADING AND UNLOADING
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Note The IS_WINDOWS function does rely on you using \ in your CONTROL_FILES parameter. Be aware
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that you may use /, but it would be highly unusual.
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The following is a procedure to create a control file to reload the unloaded data, using the DESCRIBE table generated by DBMS_SQL.DESCRIBE_COLUMNS. It takes care of the operating system specifics for us, such as whether the operating system uses a carriage return/linefeed (this is used for the STR attribute): 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 procedure dump_ctl( p_dir p_filename p_tname p_mode p_separator p_enclosure p_terminator in in in in in in in varchar2, varchar2, varchar2, varchar2, varchar2, varchar2, varchar2 )
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is l_output l_sep l_str utl_file.file_type; varchar2(5); varchar2(5) := chr(10);
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begin if ( is_windows ) then l_str := chr(13) || chr(10); end if; l_output := utl_file.fopen( p_dir, p_filename || '.ctl', 'w' ); utl_file.put_line( l_output, 'load data' ); utl_file.put_line( l_output, 'infile ''' || p_filename || '.dat'' "str x''' || utl_raw.cast_to_raw( p_terminator || l_str ) || '''"' ); utl_file.put_line( l_output, 'into table ' || p_tname ); utl_file.put_line( l_output, p_mode ); utl_file.put_line( l_output, 'fields terminated by X''' || to_hex(p_separator) || ''' enclosed by X''' || to_hex(p_enclosure) || ''' ' ); utl_file.put_line( l_output, '(' ); for i in 1 .. g_descTbl.count loop if ( g_descTbl(i).col_type = 12 )
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CHAPTER 15 DATA LOADING AND UNLOADING
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then utl_file.put( l_output, l_sep || g_descTbl(i).col_name || ' date ''ddmmyyyyhh24miss'' '); else utl_file.put( l_output, l_sep || g_descTbl(i).col_name || ' char(' || to_char(g_descTbl(i).col_max_len*2) ||' )' ); end if; l_sep := ','||g_nl ; end loop; utl_file.put_line( l_output, g_nl || ')' ); utl_file.fclose( l_output ); end;
Here is a simple function to return a quoted string using the chosen enclosure character. Notice how it not only encloses the character, but also doubles up the enclosure character if it exists in the string as well, so that they are preserved: 79 80 81 82 83 84 85 86 87 function quote(p_str in varchar2, p_enclosure in varchar2) return varchar2 is begin return p_enclosure || replace( p_str, p_enclosure, p_enclosure||p_enclosure ) || p_enclosure; end; Next we have the main function, RUN. As it is fairly large, I ll comment on it as we go along: 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 function run( p_query in varchar2, p_tname in varchar2, p_mode in varchar2 default 'REPLACE', p_dir in varchar2, p_filename in varchar2, p_separator in varchar2 default ',', p_enclosure in varchar2 default '"', p_terminator in varchar2 default '|' ) return number is l_output utl_file.file_type; l_columnValue varchar2(4000); l_colCnt number default 0; l_separator varchar2(10) default ''; l_cnt number default 0; l_line long; l_datefmt varchar2(255); l_descTbl dbms_sql.desc_tab; begin
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