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<?php
/**
* Part of the Joomla Framework Database Package
*
* @copyright Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
namespace Joomla\Database\Mysqli;
use Joomla\Database\DatabaseImporter;
/**
* MySQLi Database Importer.
*
* @since 1.0
*/
class MysqliImporter extends DatabaseImporter
{
/**
* Checks if all data and options are in order prior to exporting.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function check()
{
// Check if the db connector has been set.
if (!($this->db instanceof MysqliDriver))
{
throw new \RuntimeException('Database connection wrong type.');
}
// Check if the tables have been specified.
if (empty($this->from))
{
throw new \RuntimeException('ERROR: No Tables Specified');
}
return $this;
}
/**
* Get the SQL syntax to add a table.
*
* @param \SimpleXMLElement $table The table information.
*
* @return string
*
* @since 1.4.0
* @throws \RuntimeException
*/
protected function xmlToCreate(\SimpleXMLElement $table)
{
$existingTables = $this->db->getTableList();
$tableName = (string) $table['name'];
if (\in_array($tableName, $existingTables, true))
{
throw new \RuntimeException('The table you are trying to create already exists');
}
$createTableStatement = 'CREATE TABLE ' . $this->db->quoteName($tableName) . ' (';
foreach ($table->xpath('field') as $field)
{
$createTableStatement .= $this->getColumnSql($field) . ', ';
}
$newLookup = $this->getKeyLookup($table->xpath('key'));
foreach ($newLookup as $key)
{
$createTableStatement .= $this->getKeySql($key) . ', ';
}
$createTableStatement = rtrim($createTableStatement, ', ');
$createTableStatement .= ')';
return $createTableStatement;
}
/**
* Get the SQL syntax to add a key.
*
* @param string $table The table name.
* @param array $keys An array of the fields pertaining to this key.
*
* @return string
*
* @since 1.0
*/
protected function getAddKeySql($table, $keys)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD ' . $this->getKeySql($keys);
}
/**
* Get alters for table if there is a difference.
*
* @param \SimpleXMLElement $structure The XML structure of the table.
*
* @return array
*
* @since 1.0
*/
protected function getAlterTableSql(\SimpleXMLElement $structure)
{
$table = $this->getRealTableName($structure['name']);
$oldFields = $this->db->getTableColumns($table, false);
$oldKeys = $this->db->getTableKeys($table);
$alters = [];
// Get the fields and keys from the XML that we are aiming for.
$newFields = $structure->xpath('field');
$newKeys = $structure->xpath('key');
// Loop through each field in the new structure.
foreach ($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) || ((string) $field['Extra'] !== $column->Extra);
if ($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);
}
// Get the lookups for the old and new keys.
$oldLookup = $this->getKeyLookup($oldKeys);
$newLookup = $this->getKeyLookup($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 === $oldCount)
{
// Need to loop through each key and do a fine grained check.
for ($i = 0; $i < $newCount; $i++)
{
$same = (((string) $newLookup[$name][$i]['Non_unique'] === $oldLookup[$name][$i]->Non_unique)
&& ((string) $newLookup[$name][$i]['Column_name'] === $oldLookup[$name][$i]->Column_name)
&& ((string) $newLookup[$name][$i]['Seq_in_index'] === $oldLookup[$name][$i]->Seq_in_index)
&& ((string) $newLookup[$name][$i]['Collation'] === $oldLookup[$name][$i]->Collation)
&& ((string) $newLookup[$name][$i]['Sub_part'] == $oldLookup[$name][$i]->Sub_part)
&& ((string) $newLookup[$name][$i]['Index_type'] === $oldLookup[$name][$i]->Index_type));
/*
Debug.
echo '<pre>';
echo '<br>Non_unique: '.
((string) $newLookup[$name][$i]['Non_unique'] == $oldLookup[$name][$i]->Non_unique ? 'Pass' : 'Fail').' '.
(string) $newLookup[$name][$i]['Non_unique'].' vs '.$oldLookup[$name][$i]->Non_unique;
echo '<br>Column_name: '.
((string) $newLookup[$name][$i]['Column_name'] == $oldLookup[$name][$i]->Column_name ? 'Pass' : 'Fail').' '.
(string) $newLookup[$name][$i]['Column_name'].' vs '.$oldLookup[$name][$i]->Column_name;
echo '<br>Seq_in_index: '.
((string) $newLookup[$name][$i]['Seq_in_index'] == $oldLookup[$name][$i]->Seq_in_index ? 'Pass' : 'Fail').' '.
(string) $newLookup[$name][$i]['Seq_in_index'].' vs '.$oldLookup[$name][$i]->Seq_in_index;
echo '<br>Collation: '.
((string) $newLookup[$name][$i]['Collation'] == $oldLookup[$name][$i]->Collation ? 'Pass' : 'Fail').' '.
(string) $newLookup[$name][$i]['Collation'].' vs '.$oldLookup[$name][$i]->Collation;
echo '<br>Sub_part: '.
((string) $newLookup[$name][$i]['Sub_part'] == $oldLookup[$name][$i]->Sub_part ? 'Pass' : 'Fail').' '.
(string) $newLookup[$name][$i]['Sub_part'].' vs '.$oldLookup[$name][$i]->Sub_part;
echo '<br>Index_type: '.
((string) $newLookup[$name][$i]['Index_type'] == $oldLookup[$name][$i]->Index_type ? 'Pass' : 'Fail').' '.
(string) $newLookup[$name][$i]['Index_type'].' vs '.$oldLookup[$name][$i]->Index_type;
echo '<br>Same = '.($same ? 'true' : 'false');
echo '</pre>';
*/
if (!$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[] = $this->getDropKeySql($table, $name);
$alters[] = $this->getAddKeySql($table, $keys);
}
// Unset this field so that what we have left are fields that need to be removed.
unset($oldLookup[$name]);
}
else
{
// This is a new key.
$alters[] = $this->getAddKeySql($table, $keys);
}
}
// Any keys left are orphans.
foreach ($oldLookup as $name => $keys)
{
if (strtoupper($name) === 'PRIMARY')
{
$alters[] = $this->getDropPrimaryKeySql($table);
}
else
{
$alters[] = $this->getDropKeySql($table, $name);
}
}
return $alters;
}
/**
* Get the syntax to alter a column.
*
* @param string $table The name of the database table to alter.
* @param \SimpleXMLElement $field The XML definition for the field.
*
* @return string
*
* @since 1.0
*/
protected function getChangeColumnSql($table, \SimpleXMLElement $field)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' CHANGE COLUMN ' . $this->db->quoteName((string) $field['Field']) . ' '
. $this->getColumnSql($field);
}
/**
* Get the SQL syntax for a single column that would be included in a table create or alter statement.
*
* @param \SimpleXMLElement $field The XML field definition.
*
* @return string
*
* @since 1.0
*/
protected function getColumnSql(\SimpleXMLElement $field)
{
// TODO Incorporate into parent class and use $this.
$blobs = ['text', 'smalltext', 'mediumtext', 'largetext'];
$fName = (string) $field['Field'];
$fType = (string) $field['Type'];
$fNull = (string) $field['Null'];
$fDefault = isset($field['Default']) ? (string) $field['Default'] : null;
$fExtra = (string) $field['Extra'];
$sql = $this->db->quoteName($fName) . ' ' . $fType;
if ($fNull === 'NO')
{
if ($fDefault === null || \in_array($fType, $blobs, true))
{
$sql .= ' NOT NULL';
}
else
{
// TODO Don't quote numeric values.
if (stristr($fDefault, 'CURRENT') !== false)
{
$sql .= ' NOT NULL DEFAULT CURRENT_TIMESTAMP()';
}
else
{
$sql .= ' NOT NULL DEFAULT ' . $this->db->quote($fDefault);
}
}
}
else
{
if ($fDefault === null)
{
$sql .= ' DEFAULT NULL';
}
else
{
// TODO Don't quote numeric values.
$sql .= ' DEFAULT ' . $this->db->quote($fDefault);
}
}
if ($fExtra)
{
$sql .= ' ' . strtoupper($fExtra);
}
return $sql;
}
/**
* Get the SQL syntax to drop a key.
*
* @param string $table The table name.
* @param string $name The name of the key to drop.
*
* @return string
*
* @since 1.0
*/
protected function getDropKeySql($table, $name)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP KEY ' . $this->db->quoteName($name);
}
/**
* Get the SQL syntax to drop a key.
*
* @param string $table The table name.
*
* @return string
*
* @since 1.0
*/
protected function getDropPrimaryKeySql($table)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP PRIMARY KEY';
}
/**
* Get the details list of keys for a table.
*
* @param array $keys An array of objects that comprise the keys for the table.
*
* @return array The lookup array. array({key name} => array(object, ...))
*
* @since 1.0
*/
protected function getKeyLookup($keys)
{
// First pass, create a lookup of the keys.
$lookup = [];
foreach ($keys as $key)
{
if ($key instanceof \SimpleXMLElement)
{
$kName = (string) $key['Key_name'];
}
else
{
$kName = $key->Key_name;
}
if (empty($lookup[$kName]))
{
$lookup[$kName] = [];
}
$lookup[$kName][] = $key;
}
return $lookup;
}
/**
* Get the SQL syntax for a key.
*
* @param array $columns An array of SimpleXMLElement objects comprising the key.
*
* @return string
*
* @since 1.0
*/
protected function getKeySql($columns)
{
$kNonUnique = (string) $columns[0]['Non_unique'];
$kName = (string) $columns[0]['Key_name'];
$prefix = '';
if ($kName === 'PRIMARY')
{
$prefix = 'PRIMARY ';
}
elseif ($kNonUnique == 0)
{
$prefix = 'UNIQUE ';
}
$kColumns = [];
foreach ($columns as $column)
{
$kLength = '';
if (!empty($column['Sub_part']))
{
$kLength = '(' . $column['Sub_part'] . ')';
}
$kColumns[] = $this->db->quoteName((string) $column['Column_name']) . $kLength;
}
return $prefix . 'KEY ' . ($kName !== 'PRIMARY' ? $this->db->quoteName($kName) : '') . ' (' . implode(',', $kColumns) . ')';
}
}