Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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CHAPTER 15 ■ DATA LOADING AND UNLOADING 695 ■Note The IS_WINDOWS function does rely on you using \ in your CONTROL_FILES parameter. Be aware that you may use /, but it would be highly unusual. 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 procedure dump_ctl( p_dir in varchar2, 30 p_filename in varchar2, 31 p_tname in varchar2, 32 p_mode in varchar2, 33 p_separator in varchar2, 34 p_enclosure in varchar2, 35 p_terminator in varchar2 ) 36 is 37 l_output utl_file.file_type; 38 l_sep varchar2(5); 39 l_str varchar2(5) := chr(10); 40 41 begin 42 if ( is_windows ) 43 then 44 l_str := chr(13) || chr(10); 45 end if; 46 47 l_output := utl_file.fopen( p_dir, p_filename || '.ctl', 'w' ); 48 49 utl_file.put_line( l_output, 'load data' ); 50 utl_file.put_line( l_output, 'infile ''' || 51 p_filename || '.dat'' "str x''' || 52 utl_raw.cast_to_raw( p_terminator || 53 l_str ) || '''"' ); 54 utl_file.put_line( l_output, 'into table ' || p_tname ); 55 utl_file.put_line( l_output, p_mode ); 56 utl_file.put_line( l_output, 'fields terminated by X''' || 57 to_hex(p_separator) || 58 ''' enclosed by X''' || 59 to_hex(p_enclosure) || ''' ' ); 60 utl_file.put_line( l_output, '(' ); 61 62 for i in 1 .. g_descTbl.count 63 loop 64 if ( g_descTbl(i).col_type = 12 )
696 CHAPTER 15 ■ DATA LOADING AND UNLOADING 65 then 66 utl_file.put( l_output, l_sep || g_descTbl(i).col_name || 67 ' date ''ddmmyyyyhh24miss'' '); 68 else 69 utl_file.put( l_output, l_sep || g_descTbl(i).col_name || 70 ' char(' || 71 to_char(g_descTbl(i).col_max_len*2) ||' )' ); 72 end if; 73 l_sep := ','||g_nl ; 74 end loop; 75 utl_file.put_line( l_output, g_nl || ')' ); 76 utl_file.fclose( l_output ); 77 end; 78 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 function quote(p_str in varchar2, p_enclosure in varchar2) 80 return varchar2 81 is 82 begin 83 return p_enclosure || 84 replace( p_str, p_enclosure, p_enclosure||p_enclosure ) || 85 p_enclosure; 86 end; 87 Next we have the main function, RUN. As it is fairly large, I’ll comment on it as we go along: 88 function run( p_query in varchar2, 89 p_tname in varchar2, 90 p_mode in varchar2 default 'REPLACE', 91 p_dir in varchar2, 92 p_filename in varchar2, 93 p_separator in varchar2 default ',', 94 p_enclosure in varchar2 default '"', 95 p_terminator in varchar2 default '|' ) return number 96 is 97 l_output utl_file.file_type; 98 l_columnValue varchar2(4000); 99 l_colCnt number default 0; 100 l_separator varchar2(10) default ''; 101 l_cnt number default 0; 102 l_line long; 103 l_datefmt varchar2(255); 104 l_descTbl dbms_sql.desc_tab; 105 begin
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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Foreword “THINK.” In 1914, Thom
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■FOREWORD xiii Tom is an aficiona
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About the Technical Reviewers ■JO
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Introduction The inspiration for th
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■INTRODUCTION xix • Exposure to
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■INTRODUCTION xxi Chapter 3: File
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■INTRODUCTION xxiii Next up are t
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Setting Up Your Environment In this
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CHAPTER 1 ■ ■ ■ Developing Su
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 3 ■ FILES 89 A Brief Revi
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CHAPTER 3 ■ FILES 91 Redundant Ar
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CHAPTER 3 ■ FILES 95 dictionary t
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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CHAPTER 5 ■ ORACLE PROCESSES 157
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338 CHAPTER 10 ■ DATABASE TABLES
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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