modules/qi/query_instructions.h

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FUNCTIONS

This source file includes following functions.

   1 #ifndef READ_QUERY_INSTRUCTIONS
   2 #define READ_QUERY_INSTRUCTIONS
   3 
   4 /***************************************
   5   $Revision: 1.26 $
   6 
   7   Query instruction module (qi)
   8   config module.
   9 
  10   Status: NOT REVUED, NOT TESTED
  11 
  12   ******************/ /******************
  13   Copyright (c) 1999                              RIPE NCC
  14  
  15   All Rights Reserved
  16   
  17   Permission to use, copy, modify, and distribute this software and its
  18   documentation for any purpose and without fee is hereby granted,
  19   provided that the above copyright notice appear in all copies and that
  20   both that copyright notice and this permission notice appear in
  21   supporting documentation, and that the name of the author not be
  22   used in advertising or publicity pertaining to distribution of the
  23   software without specific, written prior permission.
  24   
  25   THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  26   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
  27   AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
  28   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  29   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  30   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  31   ***************************************/
  32 #include "rxroutines.h"
  33 #include "iproutines.h"
  34 #include "mysql_driver.h"
  35 #include "query_command.h"
  36 #include "defs.h"
  37 #include "which_keytypes.h"
  38 
  39 #include "access_control.h"
  40 
  41 
  42 
  43 /*
  44 --- snipped from http://www.tcx.se/Manual/manual.html ---
  45 
  46 5.3 Functionality missing from MySQL
  47 
  48 The following functionality is missing in the current version of MySQL. For a prioritized list indicating when new extensions may be added to MySQL, you should consult the
  49 online MySQL TODO list. That is the latest version of the TODO list in this manual. See section F List of things we want to add to MySQL in the future (The TODO). 
  50 
  51 5.3.1 Sub-selects
  52 
  53 The following will not yet work in MySQL: 
  54 
  55 SELECT * FROM table1 WHERE id IN (SELECT id FROM table2);
  56 SELECT * FROM table1 WHERE id NOT IN (SELECT id FROM table2);
  57 
  58 However, in many cases you can rewrite the query without a sub select: 
  59 
  60 SELECT table1.* FROM table1,table2 WHERE table1.id=table2.id;
  61 SELECT table1.* FROM table1 LEFT JOIN table2 ON table1.id=table2.id where table2.id IS NULL
  62 
  63 For more complicated sub queries you can create temporary tables to hold the sub query. 
  64 
  65 MySQL only supports INSERT ... SELECT ... and REPLACE ... SELECT ... Independent sub-selects will be probably be available in 3.24.0. You can now use the function IN() in other
  66 contexts, however. 
  67 
  68 --- end snip ---
  69 
  70 Ie. Try using a LEFT JOIN to do the "NOT IN"/ "MINUS" equivalent.
  71 
  72 */
  73 
  74 /*
  75   mysql optimizer is sometimes sub-optimal, 
  76   therefore we force the join order with STRAIGHT_JOIN (MB, 2000/05/02)
  77 
  78   
  79 */
  80 
  81 /* RIPE 6 */
  82 #if 1
  83 #define Q_OBJECTS     "SELECT last.object_id, last.sequence_id, last.object ,last.object_type FROM  %s IDS STRAIGHT_JOIN last,object_order WHERE last.object_id=IDS.id AND last.object_type != 100 AND last.object_type = object_order.object_type ORDER BY order_code" 
  84 #else
  85 #define Q_OBJECTS     "SELECT last.object_id, last.sequence_id, last.object ,last.object_type FROM  %s IDS STRAIGHT_JOIN last WHERE last.object_id=IDS.id AND last.object_type != 100 AND last.object_type = %s "
  86 #endif
  87 
  88 
  89 
  90 #define Q_REC         "INSERT INTO %s SELECT pe_ro_id FROM %s IDS STRAIGHT_JOIN %s WHERE object_id = IDS.id"
  91 
  92 #define Q_NO_OBJECTS  "SELECT object_id, sequence_id, object FROM last WHERE object_id = 0"
  93 
  94 #define MAX_INSTRUCTIONS 100
  95 
  96 
  97 typedef struct Query_instruction_t {
  98   R_Type_t search_type;
  99   int  queryindex;/* index into the Query table showing origin of this entry */
 100   char *query_str;
 101   char *rx_keys;
 102   unsigned int rx_srch_mode;
 103   unsigned int rx_par_a;
 104   ip_space_t space;
 105   rx_fam_t family;
 106 } Query_instruction;
 107 
 108 typedef struct Query_instructions_t {
 109   Query_instruction *instruction[MAX_INSTRUCTIONS];
 110   unsigned int filtered;
 111   unsigned int fast;
 112   unsigned int recursive;
 113   const Query_command *qc; /* pointer to the Query_command structure of this query */
 114 } Query_instructions;
 115 
 116 
 117 er_ret_t QI_execute(void *database_voidptr, Query_instructions *qis, Query_environ *qe, acc_st *acc_credit, acl_st *acl);
 118 void QI_free(Query_instructions *qis);
 119 Query_instructions *QI_new(const Query_command *qc, const Query_environ *qe);
 120 char *QI_queries_to_string(Query_instructions *qis);
 121 
 122 #endif /* READ_QUERY_INSTRUCTIONS */

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