512 lines
13 KiB
PHP
512 lines
13 KiB
PHP
|
|
<?php
|
|
/**
|
|
* StatusNet, the distributed open-source microblogging tool
|
|
*
|
|
* Database schema utilities
|
|
*
|
|
* PHP version 5
|
|
*
|
|
* LICENCE: This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* @category Database
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @copyright 2009 StatusNet, Inc.
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
if (!defined('STATUSNET')) {
|
|
exit(1);
|
|
}
|
|
|
|
/**
|
|
* Class representing the database schema
|
|
*
|
|
* A class representing the database schema. Can be used to
|
|
* manipulate the schema -- especially for plugins and upgrade
|
|
* utilities.
|
|
*
|
|
* @category Database
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
class PgsqlSchema extends Schema
|
|
{
|
|
|
|
/**
|
|
* Returns a TableDef object for the table
|
|
* in the schema with the given name.
|
|
*
|
|
* Throws an exception if the table is not found.
|
|
*
|
|
* @param string $name Name of the table to get
|
|
*
|
|
* @return TableDef tabledef for that table.
|
|
*/
|
|
|
|
public function getTableDef($name)
|
|
{
|
|
$res = $this->conn->query("SELECT *, column_default as default, is_nullable as Null,
|
|
udt_name as Type, column_name AS Field from INFORMATION_SCHEMA.COLUMNS where table_name = '$name'");
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
$td = new TableDef();
|
|
|
|
$td->name = $name;
|
|
$td->columns = array();
|
|
|
|
if ($res->numRows() == 0 ) {
|
|
throw new Exception('no such table'); //pretend to be the msyql error. yeah, this sucks.
|
|
}
|
|
$row = array();
|
|
|
|
while ($res->fetchInto($row, DB_FETCHMODE_ASSOC)) {
|
|
// var_dump($row);
|
|
$cd = new ColumnDef();
|
|
|
|
$cd->name = $row['field'];
|
|
|
|
$packed = $row['type'];
|
|
|
|
if (preg_match('/^(\w+)\((\d+)\)$/', $packed, $match)) {
|
|
$cd->type = $match[1];
|
|
$cd->size = $match[2];
|
|
} else {
|
|
$cd->type = $packed;
|
|
}
|
|
|
|
$cd->nullable = ($row['null'] == 'YES') ? true : false;
|
|
$cd->key = $row['Key'];
|
|
$cd->default = $row['default'];
|
|
$cd->extra = $row['Extra'];
|
|
|
|
$td->columns[] = $cd;
|
|
}
|
|
return $td;
|
|
}
|
|
|
|
/**
|
|
* Gets a ColumnDef object for a single column.
|
|
*
|
|
* Throws an exception if the table is not found.
|
|
*
|
|
* @param string $table name of the table
|
|
* @param string $column name of the column
|
|
*
|
|
* @return ColumnDef definition of the column or null
|
|
* if not found.
|
|
*/
|
|
|
|
public function getColumnDef($table, $column)
|
|
{
|
|
$td = $this->getTableDef($table);
|
|
|
|
foreach ($td->columns as $cd) {
|
|
if ($cd->name == $column) {
|
|
return $cd;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Creates a table with the given names and columns.
|
|
*
|
|
* @param string $name Name of the table
|
|
* @param array $columns Array of ColumnDef objects
|
|
* for new table.
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function createTable($name, $columns)
|
|
{
|
|
$uniques = array();
|
|
$primary = array();
|
|
$indices = array();
|
|
|
|
$sql = "CREATE TABLE $name (\n";
|
|
|
|
for ($i = 0; $i < count($columns); $i++) {
|
|
|
|
$cd =& $columns[$i];
|
|
|
|
if ($i > 0) {
|
|
$sql .= ",\n";
|
|
}
|
|
|
|
$sql .= $this->_columnSql($cd);
|
|
|
|
switch ($cd->key) {
|
|
case 'UNI':
|
|
$uniques[] = $cd->name;
|
|
break;
|
|
case 'PRI':
|
|
$primary[] = $cd->name;
|
|
break;
|
|
case 'MUL':
|
|
$indices[] = $cd->name;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (count($primary) > 0) { // it really should be...
|
|
$sql .= ",\n primary key (" . implode(',', $primary) . ")";
|
|
}
|
|
|
|
|
|
|
|
foreach ($indices as $i) {
|
|
$sql .= ",\nindex {$name}_{$i}_idx ($i)";
|
|
}
|
|
|
|
$sql .= "); ";
|
|
|
|
|
|
foreach ($uniques as $u) {
|
|
$sql .= "\n CREATE index {$name}_{$u}_idx ON {$name} ($u); ";
|
|
}
|
|
$res = $this->conn->query($sql);
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Drops a table from the schema
|
|
*
|
|
* Throws an exception if the table is not found.
|
|
*
|
|
* @param string $name Name of the table to drop
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function dropTable($name)
|
|
{
|
|
$res = $this->conn->query("DROP TABLE $name");
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Adds an index to a table.
|
|
*
|
|
* If no name is provided, a name will be made up based
|
|
* on the table name and column names.
|
|
*
|
|
* Throws an exception on database error, esp. if the table
|
|
* does not exist.
|
|
*
|
|
* @param string $table Name of the table
|
|
* @param array $columnNames Name of columns to index
|
|
* @param string $name (Optional) name of the index
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function createIndex($table, $columnNames, $name=null)
|
|
{
|
|
if (!is_array($columnNames)) {
|
|
$columnNames = array($columnNames);
|
|
}
|
|
|
|
if (empty($name)) {
|
|
$name = "$table_".implode("_", $columnNames)."_idx";
|
|
}
|
|
|
|
$res = $this->conn->query("ALTER TABLE $table ".
|
|
"ADD INDEX $name (".
|
|
implode(",", $columnNames).")");
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Drops a named index from a table.
|
|
*
|
|
* @param string $table name of the table the index is on.
|
|
* @param string $name name of the index
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function dropIndex($table, $name)
|
|
{
|
|
$res = $this->conn->query("ALTER TABLE $table DROP INDEX $name");
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Adds a column to a table
|
|
*
|
|
* @param string $table name of the table
|
|
* @param ColumnDef $columndef Definition of the new
|
|
* column.
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function addColumn($table, $columndef)
|
|
{
|
|
$sql = "ALTER TABLE $table ADD COLUMN " . $this->_columnSql($columndef);
|
|
|
|
$res = $this->conn->query($sql);
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Modifies a column in the schema.
|
|
*
|
|
* The name must match an existing column and table.
|
|
*
|
|
* @param string $table name of the table
|
|
* @param ColumnDef $columndef new definition of the column.
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function modifyColumn($table, $columndef)
|
|
{
|
|
$sql = "ALTER TABLE $table MODIFY COLUMN " .
|
|
$this->_columnSql($columndef);
|
|
|
|
$res = $this->conn->query($sql);
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Drops a column from a table
|
|
*
|
|
* The name must match an existing column.
|
|
*
|
|
* @param string $table name of the table
|
|
* @param string $columnName name of the column to drop
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function dropColumn($table, $columnName)
|
|
{
|
|
$sql = "ALTER TABLE $table DROP COLUMN $columnName";
|
|
|
|
$res = $this->conn->query($sql);
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Ensures that a table exists with the given
|
|
* name and the given column definitions.
|
|
*
|
|
* If the table does not yet exist, it will
|
|
* create the table. If it does exist, it will
|
|
* alter the table to match the column definitions.
|
|
*
|
|
* @param string $tableName name of the table
|
|
* @param array $columns array of ColumnDef
|
|
* objects for the table
|
|
*
|
|
* @return boolean success flag
|
|
*/
|
|
|
|
public function ensureTable($tableName, $columns)
|
|
{
|
|
// XXX: DB engine portability -> toilet
|
|
|
|
try {
|
|
$td = $this->getTableDef($tableName);
|
|
|
|
} catch (Exception $e) {
|
|
if (preg_match('/no such table/', $e->getMessage())) {
|
|
return $this->createTable($tableName, $columns);
|
|
} else {
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
$cur = $this->_names($td->columns);
|
|
$new = $this->_names($columns);
|
|
|
|
$toadd = array_diff($new, $cur);
|
|
$todrop = array_diff($cur, $new);
|
|
$same = array_intersect($new, $cur);
|
|
$tomod = array();
|
|
|
|
foreach ($same as $m) {
|
|
$curCol = $this->_byName($td->columns, $m);
|
|
$newCol = $this->_byName($columns, $m);
|
|
|
|
if (!$newCol->equals($curCol)) {
|
|
$tomod[] = $newCol->name;
|
|
}
|
|
}
|
|
|
|
if (count($toadd) + count($todrop) + count($tomod) == 0) {
|
|
// nothing to do
|
|
return true;
|
|
}
|
|
|
|
// For efficiency, we want this all in one
|
|
// query, instead of using our methods.
|
|
|
|
$phrase = array();
|
|
|
|
foreach ($toadd as $columnName) {
|
|
$cd = $this->_byName($columns, $columnName);
|
|
|
|
$phrase[] = 'ADD COLUMN ' . $this->_columnSql($cd);
|
|
}
|
|
|
|
foreach ($todrop as $columnName) {
|
|
$phrase[] = 'DROP COLUMN ' . $columnName;
|
|
}
|
|
|
|
foreach ($tomod as $columnName) {
|
|
$cd = $this->_byName($columns, $columnName);
|
|
|
|
$phrase[] = 'MODIFY COLUMN ' . $this->_columnSql($cd);
|
|
}
|
|
|
|
$sql = 'ALTER TABLE ' . $tableName . ' ' . implode(', ', $phrase);
|
|
|
|
$res = $this->conn->query($sql);
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the array of names from an array of
|
|
* ColumnDef objects.
|
|
*
|
|
* @param array $cds array of ColumnDef objects
|
|
*
|
|
* @return array strings for name values
|
|
*/
|
|
|
|
private function _names($cds)
|
|
{
|
|
$names = array();
|
|
|
|
foreach ($cds as $cd) {
|
|
$names[] = $cd->name;
|
|
}
|
|
|
|
return $names;
|
|
}
|
|
|
|
/**
|
|
* Get a ColumnDef from an array matching
|
|
* name.
|
|
*
|
|
* @param array $cds Array of ColumnDef objects
|
|
* @param string $name Name of the column
|
|
*
|
|
* @return ColumnDef matching item or null if no match.
|
|
*/
|
|
|
|
private function _byName($cds, $name)
|
|
{
|
|
foreach ($cds as $cd) {
|
|
if ($cd->name == $name) {
|
|
return $cd;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Return the proper SQL for creating or
|
|
* altering a column.
|
|
*
|
|
* Appropriate for use in CREATE TABLE or
|
|
* ALTER TABLE statements.
|
|
*
|
|
* @param ColumnDef $cd column to create
|
|
*
|
|
* @return string correct SQL for that column
|
|
*/
|
|
|
|
private function _columnSql($cd)
|
|
{
|
|
$sql = "{$cd->name} ";
|
|
|
|
if (!empty($cd->size)) {
|
|
$sql .= "{$cd->type}({$cd->size}) ";
|
|
} else {
|
|
$sql .= "{$cd->type} ";
|
|
}
|
|
|
|
if (!empty($cd->default)) {
|
|
$sql .= "default {$cd->default} ";
|
|
} else {
|
|
$sql .= ($cd->nullable) ? "null " : "not null ";
|
|
}
|
|
|
|
if (!empty($cd->auto_increment)) {
|
|
$sql .= " auto_increment ";
|
|
}
|
|
|
|
if (!empty($cd->extra)) {
|
|
$sql .= "{$cd->extra} ";
|
|
}
|
|
|
|
return $sql;
|
|
}
|
|
}
|