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}
27 * ------- Importing with triggers disabled.
29 * SET @DISABLE_TRIGGER=1; (or anything you like except NULL)
31 * SET @DISABLE_TRIGGER=NULL;
33 * ------ Call a method disabling a particular set of triggers
34 * SET @DISABLE_TRIGGER_the_table_name=1; (or anything you like except NULL)
36 * SET @DISABLE_TRIGGER_the_table_name=NULL;*
39 class Pman_Core_UpdateDatabase_MysqlLinks {
45 function __construct()
48 $this->loadIniFiles();
49 $this->updateTableComments();
51 $ff = HTML_FlexyFramework::get();
52 if (!empty($ff->Pman['enable_trigger_tests'])) {
54 // note we may want to override some of these... - to do special triggers..
55 // as you can only have one trigger per table for each action.
57 $this->createDeleteTriggers();
58 $this->createInsertTriggers();
59 $this->createUpdateTriggers();
65 function loadIniFiles()
67 // will create the combined ini cache file for the running user.
69 $ff = HTML_FlexyFramework::get();
70 $ff->generateDataobjectsCache(true);
71 $this->dburl = parse_url($ff->database);
73 $dbini = 'ini_'. basename($this->dburl['path']);
76 $iniCache = isset( $ff->PDO_DataObject) ? $ff->PDO_DataObject['schema_location'] : $ff->DB_DataObject[$dbini];
78 $this->schema = parse_ini_file($iniCache, true);
79 $this->links = parse_ini_file(preg_replace('/\.ini$/', '.links.ini', $iniCache), true);
81 $lcfg = &$this->links;
82 $cfg = empty($ff->DB_DataObject) ? array() : $ff->DB_DataObject;
84 if (!empty($cfg['table_alias'])) {
85 $ta = $cfg['table_alias'];
86 foreach($lcfg as $k=>$v) {
90 if (!isset($lcfg[$kk])) {
94 foreach($v as $l => $t_c) {
95 $bits = explode(':',$t_c);
96 $tt = isset($ta[$bits[0]]) ? $ta[$bits[0]] : $bits[0];
97 if ($tt == $bits[0] && $kk == $k) {
101 $lcfg[$kk][$l] = $tt .':'. $bits[1];
111 function updateTableComments()
113 foreach($this->links as $tbl =>$map) {
114 $this->updateTableComment($tbl, $map);
121 function updateTableComment($tbl, $map)
125 if (!isset($this->schema[$tbl])) {
126 echo "Skip $tbl = table does not exist in schema\n";
131 $q = DB_DAtaObject::factory('core_enum');
135 information_schema.TABLES
137 TABLE_SCHEMA = '{$q->escape($q->database())}'
139 TABLE_NAME = '{$q->escape($tbl)}'
142 $tc = $q->TABLE_COMMENT;
143 //echo "$tbl: $tc\n\n";
144 if (!empty($q->TABLE_COMMENT)) {
146 $tc = trim(preg_replace('/FK\([^)]+\)/', '' , $q->TABLE_COMMENT));
147 //var_dump($tc);exit;
148 // strip out the old FC(....)
152 foreach($map as $k=>$v) {
155 $fkstr = $tc . ' FK(' . implode("\n", $fks) .')';
156 if ($q->TABLE_COMMENT == $fkstr) {
160 $q = DB_DAtaObject::factory('core_enum');
161 $q->query("ALTER TABLE $tbl COMMENT = '{$q->escape($fkstr)}'");
167 function createDeleteTriggers()
170 // this should only be enabled if the project settings are configured..
174 // delete triggers on targets -
175 // if you delete a company, and a person points to it, then it should fire an error...
180 // create a list of source/targets from $this->links
184 foreach($this->links as $tbl => $map) {
185 if (!isset($this->schema[$tbl])) {
188 foreach($map as $k =>$v) {
189 list ($tname, $tcol) = explode(':', $v);
192 if (!isset($revmap[$tname])) {
193 $revmap[$tname] = array();
195 $revmap[$tname]["$tbl:$k"] = "$tname:$tcol";
202 foreach($revmap as $target_table => $sources) {
205 // throw example.. UPDATE `Error: invalid_id_test` SET x=1;
207 if (!isset($this->schema[$target_table])) {
208 echo "Skip $target_table = table does not exist in schema\n";
214 $q = DB_DataObject::factory('core_enum');
216 DROP TRIGGER IF EXISTS `{$target_table}_before_delete` ;
221 CREATE TRIGGER `{$target_table}_before_delete`
222 BEFORE DELETE ON `{$target_table}`
226 IF (@DISABLE_TRIGGER IS NULL AND @DISABLE_TRIGGER_{$target_table} IS NULL ) THEN
229 foreach($sources as $source=>$target) {
230 list($source_table , $source_col) = explode(':', $source);
231 list($target_table , $target_col) = explode(':', $target);
232 $err = substr("Failed Delete {$target_table} refs {$source_table}:{$source_col}", 0, 64);
235 IF OLD.{$target_col} > 0 THEN
236 SELECT count(*) into mid FROM {$source_table} WHERE {$source_col} = OLD.{$target_col} LIMIT 1;
238 UPDATE `$err` SET x = 1;
244 $ar = $this->listTriggerFunctions($tbl, 'delete');
245 foreach($ar as $fn=>$col) {
247 CALL $fn( OLD.{$col});
257 //DB_DAtaObject::debugLevel(1);
258 $q = DB_DataObject::factory('core_enum');
260 echo "CREATED TRIGGER {$target_table}_before_delete\n";
264 // inserting - row should not point to a reference that does not exist...
270 function createInsertTriggers()
272 foreach($this->links as $tbl => $map) {
273 if (!isset($this->schema[$tbl])) {
277 $q = DB_DataObject::factory('core_enum');
279 DROP TRIGGER IF EXISTS `{$tbl}_before_insert` ;
284 CREATE TRIGGER `{$tbl}_before_insert`
285 BEFORE INSERT ON `{$tbl}`
289 IF (@DISABLE_TRIGGER IS NULL AND @DISABLE_TRIGGER_{$tbl} IS NULL ) THEN
294 foreach($map as $source_col=>$target) {
295 // check that source_col exists in schema.
296 if (!isset($this->schema[$tbl][$source_col])) {
297 $errs[] = "SOURCE MISSING: $source_col => $target";
303 list($target_table , $target_col) = explode(':', $target);
305 if (!isset($this->schema[$target_table])) {
306 // skip... target table does not exist
307 $errs[] = "TARGET MISSING: $source_col => $target";
312 $err = substr("Fail: INSERT referenced {$tbl}:{$source_col}", 0, 64);
315 if NEW.{$source_col} > 0 THEN
316 SELECT {$target_col} into mid FROM {$target_table} WHERE {$target_col} = NEW.{$source_col} LIMIT 1;
318 UPDATE `$err` SET x = 1;
328 $ar = $this->listTriggerFunctions($tbl, 'insert');
329 foreach($ar as $fn=>$col) {
331 CALL $fn( NEW.{$col});
343 echo "SKIP TRIGGER {$tbl}_before_insert (missing " . implode(", ", $errs) . ")\n";
346 //echo $trigger; exit;
347 //DB_DAtaObject::debugLevel(1);
348 $q = DB_DataObject::factory('core_enum');
350 echo "CREATED TRIGGER {$tbl}_before_insert\n";
363 function createUpdateTriggers()
365 foreach($this->links as $tbl => $map) {
366 if (!isset($this->schema[$tbl])) {
370 $q = DB_DataObject::factory('core_enum');
372 DROP TRIGGER IF EXISTS `{$tbl}_before_update` ;
377 CREATE TRIGGER `{$tbl}_before_update`
378 BEFORE UPDATE ON `{$tbl}`
382 IF (@DISABLE_TRIGGER IS NULL AND @DISABLE_TRIGGER_{$tbl} IS NULL ) THEN
387 foreach($map as $source_col=>$target) {
388 // check that source_col exists in schema.
389 if (!isset($this->schema[$tbl][$source_col])) {
390 $errs[] = "SOURCE MISSING: $source_col => $target";
396 list($target_table , $target_col) = explode(':', $target);
398 if (!isset($this->schema[$target_table])) {
399 // skip... target table does not exist
400 $errs[] = "TARGET MISSING: $source_col => $target";
404 $err = substr("Fail: UPDATE referenced {$tbl}:$source_col", 0, 64);
407 if NEW.{$source_col} > 0 THEN
408 SELECT {$target_col} into mid FROM {$target_table} WHERE {$target_col} = NEW.{$source_col} LIMIT 1;
410 UPDATE `$err` SET x = 1;
417 $ar = $this->listTriggerFunctions($tbl, 'update');
418 foreach($ar as $fn=>$col) {
420 CALL $fn(OLD.{$col}, NEW.{$col});
431 echo "SKIP TRIGGER {$tbl}_before_update (missing " . implode(", ", $errs) . ")\n";
435 //echo $trigger; exit;
436 //DB_DAtaObject::debugLevel(1);
437 $q = DB_DataObject::factory('core_enum');
439 echo "CREATED TRIGGER {$tbl}_before_update\n";
448 * check the information schema for any methods that match the trigger criteria.
449 * -- {tablename}_trigger_{optional_string}_before_delete_{column_name}(NEW.column)
450 * -- {tablename}_trigger_{optional_string}_before_update_{column_name}(OLD.column, NEW.column}
451 * -- {tablename}_trigger_{optional_string}_before_insert_{column_name}(OLD.column}
455 // type = update/insert/delete
457 function listTriggerFunctions($table, $type)
459 static $cache = array();
460 if (!isset($cache[$table])) {
461 $cache[$table] = array();
462 $q = DB_DAtaObject::factory('core_enum');
466 information_schema.ROUTINES
468 ROUTINE_SCHEMA = '{$q->escape($q->database())}'
470 ROUTINE_NAME LIKE '" . $q->escape("{$table}_trigger_") . "%'
472 ROUTINE_TYPE = 'PROCEDURE'
475 while ($q->fetch()) {
476 $cache[$table][] = $q->SPECIFIC_NAME;
480 // now see which of the procedures match the specification..
482 foreach($cache[$table] as $cname) {
483 $bits = explode("_before_{$type}_", $cname);
484 if (count($bits) < 2) {
487 $ret[$cname] = $bits[1];