joomla_test/libraries/joomla/database/importer/postgresql.php

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2020-01-02 22:20:31 +07:00
<?php
/**
* @package Joomla.Platform
* @subpackage Database
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* PostgreSQL import driver.
*
* @package Joomla.Platform
* @subpackage Database
* @since 12.1
*/
class JDatabaseImporterPostgresql extends JDatabaseImporter
{
/**
* @var array An array of cached data.
* @since 12.1
*/
protected $cache = array();
/**
* The database connector to use for exporting structure and/or data.
*
* @var JDatabaseDriverPostgresql
* @since 12.1
*/
protected $db = null;
/**
* The input source.
*
* @var mixed
* @since 12.1
*/
protected $from = array();
/**
* The type of input format (XML).
*
* @var string
* @since 12.1
*/
protected $asFormat = 'xml';
/**
* An array of options for the exporter.
*
* @var object
* @since 12.1
*/
protected $options = null;
/**
* Constructor.
*
* Sets up the default options for the exporter.
*
* @since 12.1
*/
public function __construct()
{
$this->options = new stdClass;
$this->cache = array('columns' => array(), 'keys' => array());
// Set up the class defaults:
// Import with only structure
$this->withStructure();
// Export as XML.
$this->asXml();
// Default destination is a string using $output = (string) $exporter;
}
/**
* Set the output option for the exporter to XML format.
*
* @return JDatabaseImporterPostgresql Method supports chaining.
*
* @since 12.1
*/
public function asXml()
{
$this->asFormat = 'xml';
return $this;
}
/**
* Checks if all data and options are in order prior to exporting.
*
* @return JDatabaseImporterPostgresql Method supports chaining.
*
* @since 12.1
* @throws Exception if an error is encountered.
*/
public function check()
{
// Check if the db connector has been set.
if (!($this->db instanceof JDatabaseDriverPostgresql))
{
throw new Exception('JPLATFORM_ERROR_DATABASE_CONNECTOR_WRONG_TYPE');
}
// Check if the tables have been specified.
if (empty($this->from))
{
throw new Exception('JPLATFORM_ERROR_NO_TABLES_SPECIFIED');
}
return $this;
}
/**
* Specifies the data source to import.
*
* @param mixed $from The data source to import.
*
* @return JDatabaseImporterPostgresql Method supports chaining.
*
* @since 12.1
*/
public function from($from)
{
$this->from = $from;
return $this;
}
/**
* Get the SQL syntax to add a column.
*
* @param string $table The table name.
* @param SimpleXMLElement $field The XML field definition.
*
* @return string
*
* @since 12.1
*/
protected function getAddColumnSQL($table, SimpleXMLElement $field)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD COLUMN ' . $this->getColumnSQL($field);
}
/**
* Get the SQL syntax to add an index.
*
* @param SimpleXMLElement $field The XML index definition.
*
* @return string
*
* @since 12.1
*/
protected function getAddIndexSQL(SimpleXMLElement $field)
{
return (string) $field['Query'];
}
/**
* Get alters for table if there is a difference.
*
* @param SimpleXMLElement $structure The XML structure of the table.
*
* @return array
*
* @since 12.1
*/
protected function getAlterTableSQL(SimpleXMLElement $structure)
{
$table = $this->getRealTableName($structure['name']);
$oldFields = $this->db->getTableColumns($table);
$oldKeys = $this->db->getTableKeys($table);
$oldSequence = $this->db->getTableSequences($table);
$alters = array();
// Get the fields and keys from the XML that we are aiming for.
$newFields = $structure->xpath('field');
$newKeys = $structure->xpath('key');
$newSequence = $structure->xpath('sequence');
/* Sequence section */
$oldSeq = $this->getSeqLookup($oldSequence);
$newSequenceLook = $this->getSeqLookup($newSequence);
foreach ($newSequenceLook as $kSeqName => $vSeq)
{
if (isset($oldSeq[$kSeqName]))
{
// The field exists, check it's the same.
$column = $oldSeq[$kSeqName][0];
/* For older database version that doesn't support these fields use default values */
if (version_compare($this->db->getVersion(), '9.1.0') < 0)
{
$column->Min_Value = '1';
$column->Max_Value = '9223372036854775807';
$column->Increment = '1';
$column->Cycle_option = 'NO';
$column->Start_Value = '1';
}
// Test whether there is a change.
$change = ((string) $vSeq[0]['Type'] != $column->Type) || ((string) $vSeq[0]['Start_Value'] != $column->Start_Value)
|| ((string) $vSeq[0]['Min_Value'] != $column->Min_Value) || ((string) $vSeq[0]['Max_Value'] != $column->Max_Value)
|| ((string) $vSeq[0]['Increment'] != $column->Increment) || ((string) $vSeq[0]['Cycle_option'] != $column->Cycle_option)
|| ((string) $vSeq[0]['Table'] != $column->Table) || ((string) $vSeq[0]['Column'] != $column->Column)
|| ((string) $vSeq[0]['Schema'] != $column->Schema) || ((string) $vSeq[0]['Name'] != $column->Name);
if ($change)
{
$alters[] = $this->getChangeSequenceSQL($kSeqName, $vSeq);
}
// Unset this field so that what we have left are fields that need to be removed.
unset($oldSeq[$kSeqName]);
}
else
{
// The sequence is new
$alters[] = $this->getAddSequenceSQL($newSequenceLook[$kSeqName][0]);
}
}
// Any sequences left are orphans
foreach ($oldSeq as $name => $column)
{
// Delete the sequence.
$alters[] = $this->getDropSequenceSQL($name);
}
/* Field section */
// Loop through each field in the new structure.
foreach ($newFields as $field)
{
$fName = (string) $field['Field'];
if (isset($oldFields[$fName]))
{
// The field exists, check it's the same.
$column = $oldFields[$fName];
// Test whether there is a change.
$change = ((string) $field['Type'] != $column->Type) || ((string) $field['Null'] != $column->Null)
|| ((string) $field['Default'] != $column->Default);
if ($change)
{
$alters[] = $this->getChangeColumnSQL($table, $field);
}
// Unset this field so that what we have left are fields that need to be removed.
unset($oldFields[$fName]);
}
else
{
// The field is new.
$alters[] = $this->getAddColumnSQL($table, $field);
}
}
// Any columns left are orphans
foreach ($oldFields as $name => $column)
{
// Delete the column.
$alters[] = $this->getDropColumnSQL($table, $name);
}
/* Index section */
// Get the lookups for the old and new keys
$oldLookup = $this->getIdxLookup($oldKeys);
$newLookup = $this->getIdxLookup($newKeys);
// Loop through each key in the new structure.
foreach ($newLookup as $name => $keys)
{
// Check if there are keys on this field in the existing table.
if (isset($oldLookup[$name]))
{
$same = true;
$newCount = count($newLookup[$name]);
$oldCount = count($oldLookup[$name]);
// There is a key on this field in the old and new tables. Are they the same?
if ($newCount == $oldCount)
{
for ($i = 0; $i < $newCount; $i++)
{
// Check only query field -> different query means different index
$same = ((string) $newLookup[$name][$i]['Query'] == $oldLookup[$name][$i]->Query);
if (!$same)
{
// Break out of the loop. No need to check further.
break;
}
}
}
else
{
// Count is different, just drop and add.
$same = false;
}
if (!$same)
{
$alters[] = $this->getDropIndexSQL($name);
$alters[] = (string) $newLookup[$name][0]['Query'];
}
// Unset this field so that what we have left are fields that need to be removed.
unset($oldLookup[$name]);
}
else
{
// This is a new key.
$alters[] = (string) $newLookup[$name][0]['Query'];
}
}
// Any keys left are orphans.
foreach ($oldLookup as $name => $keys)
{
if ($oldLookup[$name][0]->is_primary == 'TRUE')
{
$alters[] = $this->getDropPrimaryKeySQL($table, $oldLookup[$name][0]->Index);
}
else
{
$alters[] = $this->getDropIndexSQL($name);
}
}
return $alters;
}
/**
* Get the SQL syntax to drop a sequence.
*
* @param string $name The name of the sequence to drop.
*
* @return string
*
* @since 12.1
*/
protected function getDropSequenceSQL($name)
{
return 'DROP SEQUENCE ' . $this->db->quoteName($name);
}
/**
* Get the syntax to add a sequence.
*
* @param SimpleXMLElement $field The XML definition for the sequence.
*
* @return string
*
* @since 12.1
*/
protected function getAddSequenceSQL($field)
{
/* For older database version that doesn't support these fields use default values */
if (version_compare($this->db->getVersion(), '9.1.0') < 0)
{
$field['Min_Value'] = '1';
$field['Max_Value'] = '9223372036854775807';
$field['Increment'] = '1';
$field['Cycle_option'] = 'NO';
$field['Start_Value'] = '1';
}
return 'CREATE SEQUENCE ' . (string) $field['Name'] .
' INCREMENT BY ' . (string) $field['Increment'] . ' MINVALUE ' . $field['Min_Value'] .
' MAXVALUE ' . (string) $field['Max_Value'] . ' START ' . (string) $field['Start_Value'] .
(((string) $field['Cycle_option'] == 'NO') ? ' NO' : '') . ' CYCLE' .
' OWNED BY ' . $this->db->quoteName((string) $field['Schema'] . '.' . (string) $field['Table'] . '.' . (string) $field['Column']);
}
/**
* Get the syntax to alter a sequence.
*
* @param SimpleXMLElement $field The XML definition for the sequence.
*
* @return string
*
* @since 12.1
*/
protected function getChangeSequenceSQL($field)
{
/* For older database version that doesn't support these fields use default values */
if (version_compare($this->db->getVersion(), '9.1.0') < 0)
{
$field['Min_Value'] = '1';
$field['Max_Value'] = '9223372036854775807';
$field['Increment'] = '1';
$field['Cycle_option'] = 'NO';
$field['Start_Value'] = '1';
}
return 'ALTER SEQUENCE ' . (string) $field['Name'] .
' INCREMENT BY ' . (string) $field['Increment'] . ' MINVALUE ' . (string) $field['Min_Value'] .
' MAXVALUE ' . (string) $field['Max_Value'] . ' START ' . (string) $field['Start_Value'] .
' OWNED BY ' . $this->db->quoteName((string) $field['Schema'] . '.' . (string) $field['Table'] . '.' . (string) $field['Column']);
}
/**
* Get the syntax to alter a column.
*
* @param string $table The name of the database table to alter.
* @param SimpleXMLElement $field The XML definition for the field.
*
* @return string
*
* @since 12.1
*/
protected function getChangeColumnSQL($table, SimpleXMLElement $field)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' ALTER COLUMN ' . $this->db->quoteName((string) $field['Field']) . ' '
. $this->getAlterColumnSQL($table, $field);
}
/**
* Get the SQL syntax for a single column that would be included in a table create statement.
*
* @param string $table The name of the database table to alter.
* @param SimpleXMLElement $field The XML field definition.
*
* @return string
*
* @since 12.1
*/
protected function getAlterColumnSQL($table, $field)
{
// TODO Incorporate into parent class and use $this.
$blobs = array('text', 'smalltext', 'mediumtext', 'largetext');
$fName = (string) $field['Field'];
$fType = (string) $field['Type'];
$fNull = (string) $field['Null'];
$fDefault = (isset($field['Default']) && $field['Default'] != 'NULL' ) ?
preg_match('/^[0-9]$/', $field['Default']) ? $field['Default'] : $this->db->quote((string) $field['Default'])
: null;
$query = ' TYPE ' . $fType;
if ($fNull == 'NO')
{
if (in_array($fType, $blobs) || $fDefault === null)
{
$query .= ",\nALTER COLUMN " . $this->db->quoteName($fName) . ' SET NOT NULL' .
",\nALTER COLUMN " . $this->db->quoteName($fName) . ' DROP DEFAULT';
}
else
{
$query .= ",\nALTER COLUMN " . $this->db->quoteName($fName) . ' SET NOT NULL' .
",\nALTER COLUMN " . $this->db->quoteName($fName) . ' SET DEFAULT ' . $fDefault;
}
}
else
{
if ($fDefault !== null)
{
$query .= ",\nALTER COLUMN " . $this->db->quoteName($fName) . ' DROP NOT NULL' .
",\nALTER COLUMN " . $this->db->quoteName($fName) . ' SET DEFAULT ' . $fDefault;
}
}
/* sequence was created in other function, here is associated a default value but not yet owner */
if (strpos($fDefault, 'nextval') !== false)
{
$query .= ";\nALTER SEQUENCE " . $this->db->quoteName($table . '_' . $fName . '_seq') . ' OWNED BY ' . $this->db->quoteName($table . '.' . $fName);
}
return $query;
}
/**
* Get the SQL syntax for a single column that would be included in a table create statement.
*
* @param SimpleXMLElement $field The XML field definition.
*
* @return string
*
* @since 12.1
*/
protected function getColumnSQL(SimpleXMLElement $field)
{
// TODO Incorporate into parent class and use $this.
$blobs = array('text', 'smalltext', 'mediumtext', 'largetext');
$fName = (string) $field['Field'];
$fType = (string) $field['Type'];
$fNull = (string) $field['Null'];
$fDefault = (isset($field['Default']) && $field['Default'] != 'NULL' ) ?
preg_match('/^[0-9]$/', $field['Default']) ? $field['Default'] : $this->db->quote((string) $field['Default'])
: null;
/* nextval() as default value means that type field is serial */
if (strpos($fDefault, 'nextval') !== false)
{
$query = $this->db->quoteName($fName) . ' SERIAL';
}
else
{
$query = $this->db->quoteName($fName) . ' ' . $fType;
if ($fNull == 'NO')
{
if (in_array($fType, $blobs) || $fDefault === null)
{
$query .= ' NOT NULL';
}
else
{
$query .= ' NOT NULL DEFAULT ' . $fDefault;
}
}
else
{
if ($fDefault !== null)
{
$query .= ' DEFAULT ' . $fDefault;
}
}
}
return $query;
}
/**
* Get the SQL syntax to drop a column.
*
* @param string $table The table name.
* @param string $name The name of the field to drop.
*
* @return string
*
* @since 12.1
*/
protected function getDropColumnSQL($table, $name)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP COLUMN ' . $this->db->quoteName($name);
}
/**
* Get the SQL syntax to drop an index.
*
* @param string $name The name of the key to drop.
*
* @return string
*
* @since 12.1
*/
protected function getDropIndexSQL($name)
{
return 'DROP INDEX ' . $this->db->quoteName($name);
}
/**
* Get the SQL syntax to drop a key.
*
* @param string $table The table name.
* @param string $name The constraint name.
*
* @return string
*
* @since 12.1
*/
protected function getDropPrimaryKeySQL($table, $name)
{
return 'ALTER TABLE ONLY ' . $this->db->quoteName($table) . ' DROP CONSTRAINT ' . $this->db->quoteName($name);
}
/**
* Get the details list of keys for a table.
*
* @param array $keys An array of objects that comprise the keys for the table.
*
* @return array The lookup array. array({key name} => array(object, ...))
*
* @since 12.1
* @throws Exception
*/
protected function getIdxLookup($keys)
{
// First pass, create a lookup of the keys.
$lookup = array();
foreach ($keys as $key)
{
if ($key instanceof SimpleXMLElement)
{
$kName = (string) $key['Index'];
}
else
{
$kName = $key->Index;
}
if (empty($lookup[$kName]))
{
$lookup[$kName] = array();
}
$lookup[$kName][] = $key;
}
return $lookup;
}
/**
* Get the details list of sequences for a table.
*
* @param array $sequences An array of objects that comprise the sequences for the table.
*
* @return array The lookup array. array({key name} => array(object, ...))
*
* @since 12.1
* @throws Exception
*/
protected function getSeqLookup($sequences)
{
// First pass, create a lookup of the keys.
$lookup = array();
foreach ($sequences as $seq)
{
if ($seq instanceof SimpleXMLElement)
{
$sName = (string) $seq['Name'];
}
else
{
$sName = $seq->Name;
}
if (empty($lookup[$sName]))
{
$lookup[$sName] = array();
}
$lookup[$sName][] = $seq;
}
return $lookup;
}
/**
* Get the real name of the table, converting the prefix wildcard string if present.
*
* @param string $table The name of the table.
*
* @return string The real name of the table.
*
* @since 12.1
*/
protected function getRealTableName($table)
{
// TODO Incorporate into parent class and use $this.
$prefix = $this->db->getPrefix();
// Replace the magic prefix if found.
$table = preg_replace('|^#__|', $prefix, $table);
return $table;
}
/**
* Merges the incoming structure definition with the existing structure.
*
* @return void
*
* @note Currently only supports XML format.
* @since 12.1
* @throws Exception on error.
* @todo If it's not XML convert to XML first.
*/
protected function mergeStructure()
{
$prefix = $this->db->getPrefix();
$tables = $this->db->getTableList();
if ($this->from instanceof SimpleXMLElement)
{
$xml = $this->from;
}
else
{
$xml = new SimpleXMLElement($this->from);
}
// Get all the table definitions.
$xmlTables = $xml->xpath('database/table_structure');
foreach ($xmlTables as $table)
{
// Convert the magic prefix into the real table name.
$tableName = (string) $table['name'];
$tableName = preg_replace('|^#__|', $prefix, $tableName);
if (in_array($tableName, $tables))
{
// The table already exists. Now check if there is any difference.
if ($queries = $this->getAlterTableSQL($xml->database->table_structure))
{
// Run the queries to upgrade the data structure.
foreach ($queries as $query)
{
$this->db->setQuery($query);
try
{
$this->db->execute();
}
catch (RuntimeException $e)
{
$this->addLog('Fail: ' . $this->db->getQuery());
throw $e;
}
$this->addLog('Pass: ' . $this->db->getQuery());
}
}
}
else
{
// This is a new table.
$query = $this->xmlToCreate($table);
$this->db->setQuery($query);
try
{
$this->db->execute();
}
catch (RuntimeException $e)
{
$this->addLog('Fail: ' . $this->db->getQuery());
throw $e;
}
$this->addLog('Pass: ' . $this->db->getQuery());
}
}
}
/**
* Sets the database connector to use for exporting structure and/or data from PostgreSQL.
*
* @param JDatabaseDriverPostgresql $db The database connector.
*
* @return JDatabaseImporterPostgresql Method supports chaining.
*
* @since 12.1
*/
public function setDbo(JDatabaseDriverPostgresql $db)
{
$this->db = $db;
return $this;
}
/**
* Sets an internal option to merge the structure based on the input data.
*
* @param boolean $setting True to export the structure, false to not.
*
* @return JDatabaseImporterPostgresql Method supports chaining.
*
* @since 12.1
*/
public function withStructure($setting = true)
{
$this->options->withStructure = (boolean) $setting;
return $this;
}
}