3 * our standard code relies on links.ini files for the relationships in mysql.
5 * as we use 'loose' relationships - eg. we allow '0' as a missing link mysql FORIEGN KEYS do not really work.
7 * There are a couple of ideas behind this code.
9 * a) put the relationships in the table comments FK(col=table:col,col=table:col)
10 * -- we can not put it in the column comments as there is no clean way to update column comments.
11 * -- This can be used by external programs to extract the Relationships.
13 * b) generate triggers? to protect against updates to the database..
15 * -- stored procedures are named
16 * {tablename}_before_{insert|delete|update}
19 * initial code will auto generate triggers
20 * -- how to add User defined modifications to triggers?
21 * -- we can CALL a stored procedure..?
22 * -- {tablename}_trigger_{optional_string}_before_delete_{column_name}(NEW.column)
23 * -- {tablename}_trigger_{optional_string}_before_update_{column_name}(OLD.column, NEW.column}
24 * -- {tablename}_trigger_{optional_string}_before_insert_{column_name}(OLD.column}
30 class Pman_Core_UpdateDatabase_MysqlLinks {
36 function __construct()
39 $this->loadIniFiles();
40 $this->updateTableComments();
41 $ff = HTML_FlexyFramework::get();
42 if (!empty($ff->Pman['enable_trigger_tests'])) {
44 // note we may want to override some of these... - to do special triggers..
45 // as you can only have one trigger per table for each action.
47 $this->createDeleteTriggers();
48 $this->createInsertTriggers();
49 $this->createUpdateTriggers();
55 function loadIniFiles()
57 // will create the combined ini cache file for the running user.
59 $ff = HTML_FlexyFramework::get();
60 $ff->generateDataobjectsCache(true);
61 $this->dburl = parse_url($ff->database);
63 $dbini = 'ini_'. basename($this->dburl['path']);
66 $iniCache = $ff->DB_DataObject[$dbini];
68 $this->schema = parse_ini_file($iniCache, true);
69 $this->links = parse_ini_file(preg_replace('/\.ini$/', '.links.ini', $iniCache), true);
74 function updateTableComments()
76 foreach($this->links as $tbl =>$map) {
77 $this->updateTableComment($tbl, $map);
84 function updateTableComment($tbl, $map)
88 if (!isset($this->schema[$tbl])) {
89 echo "Skip $tbl = table does not exist in schema\n";
94 $q = DB_DAtaObject::factory('core_enum');
98 information_schema.TABLES
100 TABLE_SCHEMA = '{$q->escape($q->database())}'
102 TABLE_NAME = '{$q->escape($tbl)}'
105 $tc = $q->TABLE_COMMENT;
106 //echo "$tbl: $tc\n\n";
107 if (!empty($q->TABLE_COMMENT)) {
109 $tc = trim(preg_replace('/FK\([^)]+\)/', '' , $q->TABLE_COMMENT));
110 //var_dump($tc);exit;
111 // strip out the old FC(....)
115 foreach($map as $k=>$v) {
119 $fkstr = $tc . ' FK(' . implode("\n", $fks) .')';
121 echo "$fkstr \n $tbl";
124 if ($q->TABLE_COMMENT == $fkstr) {
130 $q = DB_DAtaObject::factory('core_enum');
131 $q->query("ALTER TABLE $tbl COMMENT = '{$q->escape($fkstr)}'");
137 function createDeleteTriggers()
140 // this should only be enabled if the project settings are configured..
144 // delete triggers on targets -
145 // if you delete a company, and a person points to it, then it should fire an error...
150 // create a list of source/targets from $this->links
154 foreach($this->links as $tbl => $map) {
155 if (!isset($this->schema[$tbl])) {
158 foreach($map as $k =>$v) {
159 list ($tname, $tcol) = explode(':', $v);
162 if (!isset($revmap[$tname])) {
163 $revmap[$tname] = array();
165 $revmap[$tname]["$tbl:$k"] = "$tname:$tcol";
172 foreach($revmap as $target_table => $sources) {
175 // throw example.. UPDATE `Error: invalid_id_test` SET x=1;
177 if (!isset($this->schema[$target_table])) {
178 echo "Skip $target_table = table does not exist in schema\n";
184 $q = DB_DataObject::factory('core_enum');
186 DROP TRIGGER IF EXISTS `{$target_table}_before_delete` ;
191 CREATE TRIGGER `{$target_table}_before_delete`
192 BEFORE DELETE ON `{$target_table}`
199 foreach($sources as $source=>$target) {
200 list($source_table , $source_col) = explode(':', $source);
201 list($target_table , $target_col) = explode(':', $target);
202 $err = substr("Failed Delete {$target_table} refs {$source_table}:{$source_col}", 0, 64);
205 IF OLD.{$target_col} > 0 THEN
206 SELECT count(*) into mid FROM {$source_table} WHERE {$source_col} = OLD.{$target_col} LIMIT 1;
208 UPDATE `$err` SET x = 1;
214 $ar = $this->listTriggerFunctions($tbl, 'delete');
215 foreach($ar as $fn=>$col) {
217 CALL $fn( OLD.{$col});
226 //DB_DAtaObject::debugLevel(1);
227 $q = DB_DataObject::factory('core_enum');
229 echo "CREATED TRIGGER {$target_table}_before_delete\n";
233 // inserting - row should not point to a reference that does not exist...
239 function createInsertTriggers()
241 foreach($this->links as $tbl => $map) {
242 if (!isset($this->schema[$tbl])) {
246 $q = DB_DataObject::factory('core_enum');
248 DROP TRIGGER IF EXISTS `{$tbl}_before_insert` ;
253 CREATE TRIGGER `{$tbl}_before_insert`
254 BEFORE INSERT ON `{$tbl}`
261 foreach($map as $source_col=>$target) {
262 // check that source_col exists in schema.
263 if (!isset($this->schema[$tbl][$source_col])) {
269 list($target_table , $target_col) = explode(':', $target);
271 if (!isset($this->schema[$target_table])) {
272 // skip... target table does not exist
277 $err = substr("Fail: INSERT referenced {$tbl}:{$source_col}", 0, 64);
280 if NEW.{$source_col} > 0 THEN
281 SELECT {$target_col} into mid FROM {$target_table} WHERE {$target_col} = NEW.{$source_col} LIMIT 1;
283 UPDATE `$err` SET x = 1;
292 $ar = $this->listTriggerFunctions($tbl, 'insert');
293 foreach($ar as $fn=>$col) {
295 CALL $fn( NEW.{$col});
303 //echo $trigger; exit;
304 //DB_DAtaObject::debugLevel(1);
305 $q = DB_DataObject::factory('core_enum');
307 echo "CREATED TRIGGER {$tbl}_before_insert\n";
320 function createUpdateTriggers()
322 foreach($this->links as $tbl => $map) {
323 if (!isset($this->schema[$tbl])) {
327 $q = DB_DataObject::factory('core_enum');
329 DROP TRIGGER IF EXISTS `{$tbl}_before_update` ;
334 CREATE TRIGGER `{$tbl}_before_update`
335 BEFORE UPDATE ON `{$tbl}`
342 foreach($map as $source_col=>$target) {
343 // check that source_col exists in schema.
344 if (!isset($this->schema[$tbl][$source_col])) {
350 list($target_table , $target_col) = explode(':', $target);
352 if (!isset($this->schema[$target_table])) {
353 // skip... target table does not exist
357 $err = substr("Fail: UPDATE referenced {$tbl}:$source_col", 0, 64);
360 if NEW.{$source_col} > 0 THEN
361 SELECT {$target_col} into mid FROM {$target_table} WHERE {$target_col} = NEW.{$source_col} LIMIT 1;
363 UPDATE `$err` SET x = 1;
369 $ar = $this->listTriggerFunctions($tbl, 'update');
370 foreach($ar as $fn=>$col) {
372 CALL $fn(OLD.{$col}, NEW.{$col});
380 //echo $trigger; exit;
381 //DB_DAtaObject::debugLevel(1);
382 $q = DB_DataObject::factory('core_enum');
384 echo "CREATED TRIGGER {$tbl}_before_update\n";
398 * check the information schema for any methods that match the trigger criteria.
399 * -- {tablename}_trigger_{optional_string}_before_delete_{column_name}(NEW.column)
400 * -- {tablename}_trigger_{optional_string}_before_update_{column_name}(OLD.column, NEW.column}
401 * -- {tablename}_trigger_{optional_string}_before_insert_{column_name}(OLD.column}
405 // type = update/insert/delete
407 function listTriggerFunctions($table, $type)
409 static $cache = array();
410 if (!isset($cache[$table])) {
411 $cache[$table] = array();
412 $q = DB_DAtaObject::factory('core_enum');
416 information_schema.ROUTINES
418 ROUTINE_SCHEMA = '{$q->escape($q->database())}'
420 ROUTINE_NAME LIKE '" . $q->escape("{$table}_trigger_") . "%'
422 ROUTINE_TYPE = 'PROCEDURE'
425 while ($q->fetch()) {
426 $cache[$table][] = $q->SPECIFIC_NAME;
430 // now see which of the procedures match the specification..
432 foreach($cache[$table] as $cname) {
433 $bits = explode("_before_{$type}_", $cname);
434 if (count($bits) < 2) {
437 $ret[$cname] = $bits[1];