pluf2

pluf2 Commit Details


Date:2012-05-15 13:23:39 (12 years 7 months ago)
Author:Thomas Keller
Branch:master
Commit:a45dc195a7f1cc6943734434bc13cdd466c96800
Parents: 4121ca463fa4f6f8da878aba9a9288b52743087d
Message:When new tables are created (e.g. on initial installations or during upgrades), Pluf used to create foreign key relations as part of the table definitions. This however made problems when two tables, A and B, cross-referenced themselves via a foreign key relation, because strict DBMS like PostgreSQL or MySQL couldn't create such a relation without that both target tables existed prior. This patch changes this behaviour by separating table creation and foreign key setup into two phases, that have to be called after another, namely Pluf_DB_Schema::createTables() and Pluf_DB_Schema::createConstraints(). For "reverse" migrations the same logic is used, at first Pluf_DB_Schema::dropConstraints() has to be called, then Pluf_DB_Schema::dropTables() can be executed.

While being at it, I fixed the following things:
- Association tables (*_assoc) where missing foreign key relations to the base
tables for PostgreSQL; this has been fixed
- PostgreSQL's (and MySQL's as well) limit for name identifiers are 64 characters;
the schema code now ensures that we do not hit this boundary for foreign keys
- MySQL uses InnoDB tables now by default and also sets up foreign key relations
- no changes to SQLite, beside that constraints are still completly ignored, due
to the unability of SQLite to change table definitions after a table has been
created

All these changes are likely to break backwards compatibility, so if you are already
using Pluf for example to manage your database, you might be surprised that some
of your (old) tables are relation-less, while others (new ones) come with relations.
In cases like this it might be wise to backup your database (migrate.php -b) and
restore it from the dump, because this re-creates the table structure including
all the foreign key relations. Note however that the data dump might have become
inconsistent, so the restore might not go through without that your DBMS yells
at you...
Changes:

File differences

src/Pluf/DB/Schema.php
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}␊
␊
/**␊
* Creates the constraints for the current model.␊
* This should be done _after_ all tables of all models have been created.␊
*␊
* @throws Exception␊
*/␊
function createConstraints()␊
{␊
$sql = $this->schema->getSqlCreateConstraints($this->model);␊
foreach ($sql as $k => $query) {␊
if (false === $this->con->execute($query)) {␊
throw new Exception($this->con->getError());␊
}␊
}␊
}␊
␊
/**␊
* Drop the tables and indexes for the current model.␊
*␊
* @return mixed True if success or database error.␊
}␊
␊
/**␊
* Drops the constraints for the current model.␊
* This should be done _before_ all tables of all models are dropped.␊
*␊
* @throws Exception␊
* @return boolean␊
*/␊
function dropConstraints()␊
{␊
$sql = $this->schema->getSqlDeleteConstraints($this->model);␊
foreach ($sql as $k => $query) {␊
if (false === $this->con->execute($query)) {␊
throw new Exception($this->con->getError());␊
}␊
}␊
return true;␊
}␊
␊
/**␊
* Given a column name or a string with column names in the format␊
* "column1, column2, column3", returns the escaped correctly␊
* quoted column names. This is good for index creation.␊
src/Pluf/DB/Schema/MySQL.php
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$this->con = $con;␊
}␊
␊
␊
␊
/**␊
* Get the SQL to generate the tables of the given model.␊
*␊
$manytomany[] = $col;␊
}␊
}␊
$sql .= "\n".'primary key (`id`)';␊
$sql .= "\n".') ENGINE=MyISAM';␊
$sql .=' DEFAULT CHARSET=utf8;';␊
$sql .= "\n".'PRIMARY KEY (`id`))';␊
$sql .= 'ENGINE=InnoDB DEFAULT CHARSET=utf8;';␊
$tables[$this->con->pfx.$model->_a['table']] = $sql;␊
␊
//Now for the many to many␊
␊
// Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$hay = array(strtolower($model->_a['model']), strtolower($omodel->_a['model']));␊
$sql = 'CREATE TABLE `'.$this->con->pfx.$table.'` (';␊
$sql .= "\n".'`'.strtolower($model->_a['model']).'_id` '.$this->mappings['foreignkey'].' default 0,';␊
$sql .= "\n".'`'.strtolower($omodel->_a['model']).'_id` '.$this->mappings['foreignkey'].' default 0,';␊
$sql .= "\n".'primary key (`'.strtolower($model->_a['model']).'_id`, `'.strtolower($omodel->_a['model']).'_id`)';␊
$sql .= "\n".') ENGINE=MyISAM';␊
$sql .= "\n".'PRIMARY KEY ('.strtolower($model->_a['model']).'_id, '.strtolower($omodel->_a['model']).'_id)';␊
$sql .= "\n".') ENGINE=InnoDB';␊
$sql .=' DEFAULT CHARSET=utf8;';␊
$tables[$this->con->pfx.$table] = $sql;␊
}␊
if (!isset($val['col'])) {␊
$val['col'] = $idx;␊
}␊
$index[$this->con->pfx.$model->_a['table'].'_'.$idx] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$idx] =␊
sprintf('CREATE INDEX `%s` ON `%s` (%s);',␊
$idx, $this->con->pfx.$model->_a['table'], ␊
$idx, $this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($val['col'], $this->con));␊
}␊
foreach ($model->_a['cols'] as $col => $val) {␊
$field = new $val['type']();␊
if ($field->type == 'foreignkey') {␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_foreignkey'] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_foreignkey'] =␊
sprintf('CREATE INDEX `%s` ON `%s` (`%s`);',␊
$col.'_foreignkey_idx', $this->con->pfx.$model->_a['table'], $col);␊
}␊
if (isset($val['unique']) and $val['unique'] == true) {␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_unique'] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_unique'] =␊
sprintf('CREATE UNIQUE INDEX `%s` ON `%s` (%s);',␊
$col.'_unique_idx', ␊
$this->con->pfx.$model->_a['table'], ␊
$col.'_unique_idx',␊
$this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($col, $this->con)␊
);␊
}␊
}␊
␊
/**␊
* Workaround for <http://bugs.mysql.com/bug.php?id=13942> which limits the␊
* length of foreign key identifiers to 64 characters.␊
*␊
* @param string␊
* @return string␊
*/␊
function getShortenedFKeyName($name)␊
{␊
if (strlen($name) <= 64) {␊
return $name;␊
}␊
return substr($name, 0, 55).'_'.substr(md5($name), 0, 8);␊
}␊
␊
/**␊
* Get the SQL to create the constraints for the given model␊
*␊
* @param Object Model␊
* @return array Array of SQL strings ready to execute.␊
*/␊
function getSqlCreateConstraints($model)␊
{␊
$table = $this->con->pfx.$model->_a['table'];␊
$constraints = array();␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$cols = $model->_a['cols'];␊
$manytomany = array();␊
␊
foreach ($cols as $col => $val) {␊
$field = new $val['type']();␊
// remember these for later␊
if ($field->type == 'manytomany') {␊
$manytomany[] = $col;␊
}␊
if ($field->type == 'foreignkey') {␊
// Add the foreignkey constraints␊
$referto = new $val['model']();␊
$constraints[] = $alter_tbl.' ADD CONSTRAINT '.$this->getShortenedFKeyName($table.'_'.$col.'_fkey').'␊
FOREIGN KEY ('.$this->con->qn($col).')␊
REFERENCES '.$this->con->pfx.$referto->_a['table'].' (id)␊
ON DELETE NO ACTION ON UPDATE NO ACTION';␊
}␊
}␊
␊
// Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$hay = array(strtolower($model->_a['model']), strtolower($omodel->_a['model']));␊
sort($hay);␊
$table = $this->con->pfx.$hay[0].'_'.$hay[1].'_assoc';␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$constraints[] = $alter_tbl.' ADD CONSTRAINT '.$this->getShortenedFKeyName($table.'_fkey1').'␊
FOREIGN KEY ('.strtolower($model->_a['model']).'_id)␊
REFERENCES '.$this->con->pfx.$model->_a['table'].' (id)␊
ON DELETE NO ACTION ON UPDATE NO ACTION';␊
$constraints[] = $alter_tbl.' ADD CONSTRAINT '.$this->getShortenedFKeyName($table.'_fkey2').'␊
FOREIGN KEY ('.strtolower($omodel->_a['model']).'_id)␊
REFERENCES '.$this->con->pfx.$omodel->_a['table'].' (id)␊
ON DELETE NO ACTION ON UPDATE NO ACTION';␊
}␊
return $constraints;␊
}␊
␊
/**␊
* Get the SQL to drop the tables corresponding to the model.␊
*␊
* @param Object Model␊
$manytomany[] = $col;␊
}␊
}␊
␊
␊
//Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$sql .= ', `'.$this->con->pfx.$table.'`';␊
}␊
return array($sql);␊
}␊
␊
/**␊
* Get the SQL to drop the constraints for the given model␊
*␊
* @param Object Model␊
* @return array Array of SQL strings ready to execute.␊
*/␊
function getSqlDeleteConstraints($model)␊
{␊
$table = $this->con->pfx.$model->_a['table'];␊
$constraints = array();␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$cols = $model->_a['cols'];␊
$manytomany = array();␊
␊
foreach ($cols as $col => $val) {␊
$field = new $val['type']();␊
// remember these for later␊
if ($field->type == 'manytomany') {␊
$manytomany[] = $col;␊
}␊
if ($field->type == 'foreignkey') {␊
// Add the foreignkey constraints␊
$referto = new $val['model']();␊
$constraints[] = $alter_tbl.' DROP CONSTRAINT '.$this->getShortenedFKeyName($table.'_'.$col.'_fkey');␊
}␊
}␊
␊
// Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$hay = array(strtolower($model->_a['model']), strtolower($omodel->_a['model']));␊
sort($hay);␊
$table = $this->con->pfx.$hay[0].'_'.$hay[1].'_assoc';␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$constraints[] = $alter_tbl.' DROP CONSTRAINT '.$this->getShortenedFKeyName($table.'_fkey1');␊
$constraints[] = $alter_tbl.' DROP CONSTRAINT '.$this->getShortenedFKeyName($table.'_fkey2');␊
}␊
return $constraints;␊
}␊
}␊
src/Pluf/DB/Schema/PostgreSQL.php
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$manytomany = array();␊
$query = 'CREATE TABLE '.$this->con->pfx.$model->_a['table'].' (';␊
$sql_col = array();␊
$constraints = array();␊
foreach ($cols as $col => $val) {␊
$field = new $val['type']();␊
if ($field->type != 'manytomany') {␊
} else {␊
$manytomany[] = $col;␊
}␊
if ($field->type == 'foreignkey') {␊
// Add the foreignkey constraints␊
$referto = new $val['model']();␊
$_c = 'CONSTRAINT '.$this->con->pfx.$model->_a['table'].'_'.$col.'_fkey FOREIGN KEY ('.$this->con->qn($col).')␊
REFERENCES '.$this->con->pfx.$referto->_a['table'].' (id) MATCH SIMPLE␊
ON UPDATE NO ACTION ON DELETE NO ACTION';␊
$constraints[] = $_c;␊
}␊
}␊
$sql_col[] = 'CONSTRAINT '.$this->con->pfx.$model->_a['table'].'_pkey PRIMARY KEY (id)';␊
$sql_col = array_merge($sql_col, $constraints);␊
$query = $query."\n".implode(",\n", $sql_col)."\n".');';␊
$tables[$this->con->pfx.$model->_a['table']] = $query;␊
//Now for the many to many␊
//FIXME add index on the second column␊
// Now for the many to many␊
// FIXME add index on the second column␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$hay = array(strtolower($model->_a['model']), strtolower($omodel->_a['model']));␊
$sql = 'CREATE TABLE '.$this->con->pfx.$table.' (';␊
$sql .= "\n".strtolower($model->_a['model']).'_id '.$this->mappings['foreignkey'].' default 0,';␊
$sql .= "\n".strtolower($omodel->_a['model']).'_id '.$this->mappings['foreignkey'].' default 0,';␊
$sql .= "\n".'CONSTRAINT '.$this->con->pfx.$table.'_pkey PRIMARY KEY ('.strtolower($model->_a['model']).'_id, '.strtolower($omodel->_a['model']).'_id)';␊
$sql .= "\n".'CONSTRAINT '.$this->getShortenedIdentifierName($this->con->pfx.$table.'_pkey').' PRIMARY KEY ('.strtolower($model->_a['model']).'_id, '.strtolower($omodel->_a['model']).'_id)';␊
$sql .= "\n".');';␊
$tables[$this->con->pfx.$table] = $sql;␊
}␊
$unique = '';␊
}␊
␊
$index[$this->con->pfx.$model->_a['table'].'_'.$idx] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$idx] =␊
sprintf('CREATE '.$unique.'INDEX %s ON %s (%s);',␊
$this->con->pfx.$model->_a['table'].'_'.$idx, ␊
$this->con->pfx.$model->_a['table'], ␊
$this->con->pfx.$model->_a['table'].'_'.$idx,␊
$this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($val['col'], $this->con)␊
);␊
}␊
foreach ($model->_a['cols'] as $col => $val) {␊
$field = new $val['type']();␊
if (isset($val['unique']) and $val['unique'] == true) {␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_unique'] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_unique'] =␊
sprintf('CREATE UNIQUE INDEX %s ON %s (%s);',␊
$this->con->pfx.$model->_a['table'].'_'.$col.'_unique_idx', ␊
$this->con->pfx.$model->_a['table'], ␊
$this->con->pfx.$model->_a['table'].'_'.$col.'_unique_idx',␊
$this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($col, $this->con)␊
);␊
}␊
}␊
␊
/**␊
* All identifiers in Postgres must not exceed 64 characters in length.␊
*␊
* @param string␊
* @return string␊
*/␊
function getShortenedIdentifierName($name)␊
{␊
if (strlen($name) <= 64) {␊
return $name;␊
}␊
return substr($name, 0, 55).'_'.substr(md5($name), 0, 8);␊
}␊
␊
/**␊
* Get the SQL to create the constraints for the given model␊
*␊
* @param Object Model␊
* @return array Array of SQL strings ready to execute.␊
*/␊
function getSqlCreateConstraints($model)␊
{␊
$table = $this->con->pfx.$model->_a['table'];␊
$constraints = array();␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$cols = $model->_a['cols'];␊
$manytomany = array();␊
␊
foreach ($cols as $col => $val) {␊
$field = new $val['type']();␊
// remember these for later␊
if ($field->type == 'manytomany') {␊
$manytomany[] = $col;␊
}␊
if ($field->type == 'foreignkey') {␊
// Add the foreignkey constraints␊
$referto = new $val['model']();␊
$constraints[] = $alter_tbl.' ADD CONSTRAINT '.$this->getShortenedIdentifierName($table.'_'.$col.'_fkey').'␊
FOREIGN KEY ('.$this->con->qn($col).')␊
REFERENCES '.$this->con->pfx.$referto->_a['table'].' (id) MATCH SIMPLE␊
ON UPDATE NO ACTION ON DELETE NO ACTION';␊
}␊
}␊
␊
// Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$hay = array(strtolower($model->_a['model']), strtolower($omodel->_a['model']));␊
sort($hay);␊
$table = $this->con->pfx.$hay[0].'_'.$hay[1].'_assoc';␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$constraints[] = $alter_tbl.' ADD CONSTRAINT '.$this->getShortenedIdentifierName($table.'_fkey1').'␊
FOREIGN KEY ('.strtolower($model->_a['model']).'_id)␊
REFERENCES '.$this->con->pfx.$model->_a['table'].' (id) MATCH SIMPLE␊
ON UPDATE NO ACTION ON DELETE NO ACTION';␊
$constraints[] = $alter_tbl.' ADD CONSTRAINT '.$this->getShortenedIdentifierName($table.'_fkey2').'␊
FOREIGN KEY ('.strtolower($omodel->_a['model']).'_id)␊
REFERENCES '.$this->con->pfx.$omodel->_a['table'].' (id) MATCH SIMPLE␊
ON UPDATE NO ACTION ON DELETE NO ACTION';␊
}␊
return $constraints;␊
}␊
␊
/**␊
* Get the SQL to drop the tables corresponding to the model.␊
*␊
* @param Object Model␊
$manytomany[] = $col;␊
}␊
}␊
␊
␊
//Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
}␊
return $sql;␊
}␊
␊
/**␊
* Get the SQL to drop the constraints for the given model␊
*␊
* @param Object Model␊
* @return array Array of SQL strings ready to execute.␊
*/␊
function getSqlDeleteConstraints($model)␊
{␊
$table = $this->con->pfx.$model->_a['table'];␊
$constraints = array();␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$cols = $model->_a['cols'];␊
$manytomany = array();␊
␊
foreach ($cols as $col => $val) {␊
$field = new $val['type']();␊
// remember these for later␊
if ($field->type == 'manytomany') {␊
$manytomany[] = $col;␊
}␊
if ($field->type == 'foreignkey') {␊
// Add the foreignkey constraints␊
$referto = new $val['model']();␊
$constraints[] = $alter_tbl.' DROP CONSTRAINT '.$this->getShortenedIdentifierName($table.'_'.$col.'_fkey');␊
}␊
}␊
␊
// Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$hay = array(strtolower($model->_a['model']), strtolower($omodel->_a['model']));␊
sort($hay);␊
$table = $this->con->pfx.$hay[0].'_'.$hay[1].'_assoc';␊
$alter_tbl = 'ALTER TABLE '.$table;␊
$constraints[] = $alter_tbl.' DROP CONSTRAINT '.$this->getShortenedIdentifierName($table.'_fkey1');␊
$constraints[] = $alter_tbl.' DROP CONSTRAINT '.$this->getShortenedIdentifierName($table.'_fkey2');␊
}␊
return $constraints;␊
}␊
}␊
␊
src/Pluf/DB/Schema/SQLite.php
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}␊
$query = $query."\n".implode(",\n", $sql_col)."\n".');';␊
$tables[$this->con->pfx.$model->_a['table']] = $query;␊
␊
␊
//Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
}␊
␊
/**␊
* SQLite cannot add foreign key constraints to already existing tables,␊
* so we skip their creation completely.␊
*␊
* @param Object Model␊
* @return array␊
*/␊
function getSqlCreateConstraints($model)␊
{␊
return array();␊
}␊
␊
/**␊
* Get the SQL to generate the indexes of the given model.␊
*␊
* @param Object Model␊
$val['col'] = $idx;␊
}␊
$unique = (isset($val['type']) && ($val['type'] == 'unique')) ? 'UNIQUE ' : '';␊
$index[$this->con->pfx.$model->_a['table'].'_'.$idx] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$idx] =␊
sprintf('CREATE %sINDEX %s ON %s (%s);',␊
$unique,␊
$this->con->pfx.$model->_a['table'].'_'.$idx, ␊
$this->con->pfx.$model->_a['table'], ␊
$this->con->pfx.$model->_a['table'].'_'.$idx,␊
$this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($val['col'], $this->con)␊
);␊
}␊
foreach ($model->_a['cols'] as $col => $val) {␊
$field = new $val['type']();␊
if ($field->type == 'foreignkey') {␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_foreignkey'] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_foreignkey'] =␊
sprintf('CREATE INDEX %s ON %s (%s);',␊
$this->con->pfx.$model->_a['table'].'_'.$col.'_foreignkey_idx', ␊
$this->con->pfx.$model->_a['table'], ␊
$this->con->pfx.$model->_a['table'].'_'.$col.'_foreignkey_idx',␊
$this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($col, $this->con));␊
}␊
if (isset($val['unique']) and $val['unique'] == true) {␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_unique'] = ␊
$index[$this->con->pfx.$model->_a['table'].'_'.$col.'_unique'] =␊
sprintf('CREATE UNIQUE INDEX %s ON %s (%s);',␊
$this->con->pfx.$model->_a['table'].'_'.$col.'_unique_idx', ␊
$this->con->pfx.$model->_a['table'], ␊
$this->con->pfx.$model->_a['table'].'_'.$col.'_unique_idx',␊
$this->con->pfx.$model->_a['table'],␊
Pluf_DB_Schema::quoteColumn($col, $this->con)␊
);␊
}␊
$manytomany[] = $col;␊
}␊
}␊
␊
␊
//Now for the many to many␊
foreach ($manytomany as $many) {␊
$omodel = new $cols[$many]['model']();␊
$sql[] = 'DROP TABLE IF EXISTS '.$this->con->pfx.$table;␊
}␊
return $sql;␊
}␊
␊
/**␊
* SQLite cannot drop foreign keys from existing tables,␊
* so we skip their deletion completely.␊
*␊
* @param Object Model␊
* @return array␊
*/␊
function getSqlDeleteConstraints($model)␊
{␊
return array();␊
}␊
}␊
␊

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