gnu-social/lib/database/schema.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
* Database schema
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*
* @category Database
* @package GNUsocial
* @author Evan Prodromou <evan@status.net>
* @author Brion Vibber <brion@status.net>
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
defined('GNUSOCIAL') || die();
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/**
* Class representing the database schema
*
* A class representing the database schema. Can be used to
* manipulate the schema -- especially for plugins and upgrade
* utilities.
*
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
class Schema
{
public static $_static = null;
protected $conn = null;
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/**
* Constructor. Only run once for singleton object.
* @param null $conn
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*/
protected function __construct($conn = null)
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{
if (is_null($conn)) {
// XXX: there should be an easier way to do this.
$user = new User();
$conn = $user->getDatabaseConnection();
$user->free();
unset($user);
}
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$this->conn = $conn;
}
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/**
* Main public entry point. Use this to get
* the schema object.
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*
* @param object|null $conn
* @param string|null Force a database type (necessary for installation purposes in which we don't have a config.php)
* @return Schema the Schema object for the connection
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*/
public static function get($conn = null, $dbtype = null)
{
if (is_null($conn)) {
$key = 'default';
} else {
$key = md5(serialize($conn->dsn));
}
if (is_null($dbtype)) {
$dbtype = common_config('db', 'type');
}
if (empty(self::$_static[$key])) {
$schemaClass = ucfirst($dbtype) . 'Schema';
self::$_static[$key] = new $schemaClass($conn);
}
return self::$_static[$key];
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}
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/**
* Gets a ColumnDef object for a single column.
*
* Throws an exception if the table is not found.
*
* @param string $table name of the table
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* @param string $column name of the column
*
* @return ColumnDef definition of the column or null
* if not found.
*/
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public function getColumnDef($table, $column)
{
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$td = $this->getTableDef($table);
if (!empty($td) && !empty($td->columns)) {
foreach ($td->columns as $cd) {
if ($cd->name == $column) {
return $cd;
}
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}
}
return null;
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}
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/**
* Creates a table with the given names and columns.
*
* @param string $tableName Name of the table
* @param array $def Table definition array listing fields and indexes.
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*
* @return bool success flag
* @throws PEAR_Exception
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*/
public function createTable($tableName, $def)
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{
$statements = $this->buildCreateTable($tableName, $def);
return $this->runSqlSet($statements);
}
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/**
* Build a set of SQL statements to create a table with the given
* name and columns.
*
* @param string $name Name of the table
* @param array $def Table definition array
*
* @return array success flag
* @throws Exception
*/
public function buildCreateTable($name, $def)
{
$def = $this->validateDef($name, $def);
$def = $this->filterDef($name, $def);
$sql = [];
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foreach ($def['fields'] as $col => $colDef) {
$this->appendColumnDef($sql, $col, $colDef);
}
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// Primary, unique, and foreign keys are constraints, so go within
// the CREATE TABLE statement normally.
if (!empty($def['primary key'])) {
$this->appendPrimaryKeyDef($sql, $def['primary key']);
}
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if (!empty($def['unique keys'])) {
foreach ($def['unique keys'] as $col => $colDef) {
$this->appendUniqueKeyDef($sql, $col, $colDef);
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}
}
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if (!empty($def['foreign keys'])) {
foreach ($def['foreign keys'] as $keyName => $keyDef) {
$this->appendForeignKeyDef($sql, $keyName, $keyDef);
}
}
// Wrap the CREATE TABLE around the main body chunks...
$statements = [];
$statements[] = $this->startCreateTable($name, $def) . "\n" .
implode(",\n", $sql) . "\n" .
$this->endCreateTable($name, $def);
// Multi-value indexes are advisory and for best portability
// should be created as separate statements.
if (!empty($def['indexes'])) {
foreach ($def['indexes'] as $col => $colDef) {
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$this->appendCreateIndex($statements, $name, $col, $colDef);
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}
}
if (!empty($def['fulltext indexes'])) {
foreach ($def['fulltext indexes'] as $col => $colDef) {
$this->appendCreateFulltextIndex($statements, $name, $col, $colDef);
}
}
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return $statements;
}
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/**
* Set up a 'create table' SQL statement.
*
* @param string $name table name
* @param array $def table definition
* @return string
*/
public function startCreateTable($name, array $def)
{
return 'CREATE TABLE ' . $this->quoteIdentifier($name) . ' (';
}
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/**
* Close out a 'create table' SQL statement.
*
* @param string $name table name
* @param array $def table definition
* @return string
*/
public function endCreateTable($name, array $def)
{
return ')';
}
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/**
* Append an SQL fragment with a column definition in a CREATE TABLE statement.
*
* @param array $sql
* @param string $name
* @param array $def
*/
public function appendColumnDef(array &$sql, string $name, array $def)
{
$sql[] = $name . ' ' . $this->columnSql($name, $def);
}
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/**
* Append an SQL fragment with a constraint definition for a primary
* key in a CREATE TABLE statement.
*
* @param array $sql
* @param array $def
*/
public function appendPrimaryKeyDef(array &$sql, array $def)
{
$sql[] = "PRIMARY KEY " . $this->buildIndexList($def);
}
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/**
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* Append an SQL fragment with a constraint definition for a unique
* key in a CREATE TABLE statement.
*
* @param array $sql
* @param string $name
* @param array $def
*/
public function appendUniqueKeyDef(array &$sql, $name, array $def)
{
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$sql[] = "CONSTRAINT $name UNIQUE " . $this->buildIndexList($def);
}
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/**
* Append an SQL fragment with a constraint definition for a foreign
* key in a CREATE TABLE statement.
*
* @param array $sql
* @param string $name
* @param array $def
* @throws Exception
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*/
public function appendForeignKeyDef(array &$sql, $name, array $def)
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{
if (count($def) != 2) {
throw new Exception("Invalid foreign key def for $name: " . var_export($def, true));
}
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list($refTable, $map) = $def;
$srcCols = array_keys($map);
$refCols = array_values($map);
$sql[] = 'CONSTRAINT ' . $this->quoteIdentifier($name) . ' FOREIGN KEY ' .
$this->buildIndexList($srcCols) .
' REFERENCES ' .
$this->quoteIdentifier($refTable) .
' ' .
$this->buildIndexList($refCols);
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}
/**
* Append an SQL statement with an index definition for an advisory
* index over one or more columns on a table.
*
* @param array $statements
* @param string $table
* @param string $name
* @param array $def
*/
public function appendCreateIndex(array &$statements, $table, $name, array $def)
{
$statements[] = 'CREATE INDEX ' . $name . ' ON ' .
$this->quoteIdentifier($table) . ' ' . $this->buildIndexList($def);
}
/**
* Append an SQL statement with an index definition for a full-text search
* index over one or more columns on a table.
*
* @param array $statements
* @param string $table
* @param string $name
* @param array $def
* @throws Exception
*/
public function appendCreateFulltextIndex(array &$statements, $table, $name, array $def)
{
throw new Exception("Fulltext index not supported in this database");
}
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/**
* Append an SQL statement to drop an index from a table.
*
* @param array $statements
* @param string $table
* @param string $name
*/
public function appendDropIndex(array &$statements, $table, $name)
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{
$statements[] = "DROP INDEX $name ON " . $this->quoteIdentifier($table);
}
public function buildIndexList(array $def)
{
// @fixme
return '(' . implode(',', array_map([$this, 'buildIndexItem'], $def)) . ')';
}
public function buildIndexItem($def)
{
if (is_array($def)) {
list($name, $size) = $def;
return $this->quoteIdentifier($name) . '(' . intval($size) . ')';
}
return $this->quoteIdentifier($def);
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}
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/**
* Drops a table from the schema
*
* Throws an exception if the table is not found.
*
* @param string $name Name of the table to drop
*
* @return bool success flag
* @throws PEAR_Exception
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*/
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public function dropTable($name)
{
global $_PEAR;
$res = $this->conn->query('DROP TABLE ' . $this->quoteIdentifier($name));
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if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
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}
return true;
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}
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/**
* 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 $name (Optional) name of the index
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*
* @return bool success flag
* @throws PEAR_Exception
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*/
public function createIndex($table, $columnNames, $name = null)
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{
global $_PEAR;
$qry = [];
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if (!is_array($columnNames)) {
$columnNames = [$columnNames];
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}
if (empty($name)) {
$name = "{$table}_" . implode("_", $columnNames) . "_idx";
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}
$this->appendCreateIndex($qry, $table, $name, $columnNames);
$res = $this->conn->query(implode('; ', $qry));
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if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
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}
return true;
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}
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/**
* Drops a named index from a table.
*
* @param string $table name of the table the index is on.
* @param string $name name of the index
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*
* @return bool success flag
* @throws PEAR_Exception
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*/
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public function dropIndex($table, $name)
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{
global $_PEAR;
$res = $this->conn->query(
'ALTER TABLE ' . $this->quoteIdentifier($table) .
' DROP INDEX ' . $name
);
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if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
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}
return true;
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}
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/**
* Adds a column to a table
*
* @param string $table name of the table
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* @param ColumnDef $columndef Definition of the new
* column.
*
* @return bool success flag
* @throws PEAR_Exception
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*/
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public function addColumn($table, $columndef)
{
global $_PEAR;
$sql = 'ALTER TABLE ' . $this->quoteIdentifier($table) .
' ADD COLUMN ' . $this->columnSql($name, $columndef);
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$res = $this->conn->query($sql);
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if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
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}
return true;
}
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/**
* Modifies a column in the schema.
*
* The name must match an existing column and table.
*
* @param string $table name of the table
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* @param ColumnDef $columndef new definition of the column.
*
* @return bool success flag
* @throws PEAR_Exception
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*/
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public function modifyColumn($table, $columndef)
{
global $_PEAR;
$sql = 'ALTER TABLE ' . $this->quoteIdentifier($table) .
' MODIFY COLUMN ' . $this->columnSql($name, $columndef);
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$res = $this->conn->query($sql);
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if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
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}
return true;
}
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/**
* Drops a column from a table
*
* The name must match an existing column.
*
* @param string $table name of the table
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* @param string $columnName name of the column to drop
*
* @return bool success flag
* @throws PEAR_Exception
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*/
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public function dropColumn($table, $columnName)
{
global $_PEAR;
$sql = 'ALTER TABLE ' . $this->quoteIdentifier($table) .
' DROP COLUMN ' . $columnName;
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$res = $this->conn->query($sql);
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if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
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}
return true;
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}
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/**
* 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 $def Table definition array
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*
* @return bool success flag
* @throws PEAR_Exception
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*/
public function ensureTable($tableName, $def)
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{
$statements = $this->buildEnsureTable($tableName, $def);
return $this->runSqlSet($statements);
}
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/**
* Run a given set of SQL commands on the connection in sequence.
* Empty input is ok.
*
* @fixme if multiple statements, wrap in a transaction?
* @param array $statements
* @return bool success flag
* @throws PEAR_Exception
*/
public function runSqlSet(array $statements)
{
global $_PEAR;
$ok = true;
foreach ($statements as $sql) {
if (defined('DEBUG_INSTALLER')) {
echo "<code>" . htmlspecialchars($sql) . "</code><br/>\n";
}
$res = $this->conn->query($sql);
if ($_PEAR->isError($res)) {
common_debug('PEAR exception on query: ' . $sql);
PEAR_ErrorToPEAR_Exception($res);
}
}
return $ok;
}
/**
* Check a table's status, and if needed build a set
* of SQL statements which change it to be consistent
* with the given table definition.
*
* If the table does not yet exist, statements will
* be returned to create the table. If it does exist,
* statements will be returned to alter the table to
* match the column definitions.
*
* @param string $tableName name of the table
* @param array $def
* @return array of SQL statements
* @throws Exception
*/
public function buildEnsureTable($tableName, array $def)
{
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try {
$old = $this->getTableDef($tableName);
} catch (SchemaTableMissingException $e) {
return $this->buildCreateTable($tableName, $def);
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}
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// Filter the DB-independent table definition to match the current
// database engine's features and limitations.
$def = $this->validateDef($tableName, $def);
$def = $this->filterDef($tableName, $def);
$statements = [];
$fields = $this->diffArrays($old, $def, 'fields');
$uniques = $this->diffArrays($old, $def, 'unique keys');
$indexes = $this->diffArrays($old, $def, 'indexes');
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$foreign = $this->diffArrays($old, $def, 'foreign keys');
$fulltext = $this->diffArrays($old, $def, 'fulltext indexes');
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// Drop any obsolete or modified indexes ahead...
foreach ($indexes['del'] + $indexes['mod'] as $indexName) {
$this->appendDropIndex($statements, $tableName, $indexName);
}
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// Drop any obsolete or modified fulltext indexes ahead...
foreach ($fulltext['del'] + $fulltext['mod'] as $indexName) {
$this->appendDropIndex($statements, $tableName, $indexName);
}
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// For efficiency, we want this all in one
// query, instead of using our methods.
$phrase = [];
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foreach ($foreign['del'] + $foreign['mod'] as $keyName) {
$this->appendAlterDropForeign($phrase, $keyName);
}
foreach ($uniques['del'] + $uniques['mod'] as $keyName) {
$this->appendAlterDropUnique($phrase, $keyName);
}
if (isset($old['primary key']) && (!isset($def['primary key']) || $def['primary key'] != $old['primary key'])) {
$this->appendAlterDropPrimary($phrase, $tableName);
}
foreach ($fields['add'] as $columnName) {
$this->appendAlterAddColumn(
$phrase,
$columnName,
$def['fields'][$columnName]
);
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}
foreach ($fields['mod'] as $columnName) {
$this->appendAlterModifyColumn(
$phrase,
$columnName,
$old['fields'][$columnName],
$def['fields'][$columnName]
);
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}
foreach ($fields['del'] as $columnName) {
$this->appendAlterDropColumn($phrase, $columnName);
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}
if (isset($def['primary key']) && (!isset($old['primary key']) || $old['primary key'] != $def['primary key'])) {
$this->appendAlterAddPrimary($phrase, $def['primary key']);
}
foreach ($uniques['mod'] + $uniques['add'] as $keyName) {
$this->appendAlterAddUnique($phrase, $keyName, $def['unique keys'][$keyName]);
}
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foreach ($foreign['mod'] + $foreign['add'] as $keyName) {
$this->appendAlterAddForeign($phrase, $keyName, $def['foreign keys'][$keyName]);
}
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$this->appendAlterExtras($phrase, $tableName, $def);
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if (count($phrase) > 0) {
$sql = 'ALTER TABLE ' . $this->quoteIdentifier($tableName) .
' ' . implode(",\n", $phrase);
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$statements[] = $sql;
}
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// Now create any indexes...
foreach ($indexes['mod'] + $indexes['add'] as $indexName) {
$this->appendCreateIndex($statements, $tableName, $indexName, $def['indexes'][$indexName]);
}
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foreach ($fulltext['mod'] + $fulltext['add'] as $indexName) {
$colDef = $def['fulltext indexes'][$indexName];
$this->appendCreateFulltextIndex($statements, $tableName, $indexName, $colDef);
}
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return $statements;
}
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public function diffArrays($oldDef, $newDef, $section, $compareCallback = null)
{
$old = isset($oldDef[$section]) ? $oldDef[$section] : [];
$new = isset($newDef[$section]) ? $newDef[$section] : [];
$oldKeys = array_keys($old);
$newKeys = array_keys($new);
$toadd = array_diff($newKeys, $oldKeys);
$todrop = array_diff($oldKeys, $newKeys);
$same = array_intersect($newKeys, $oldKeys);
$tomod = [];
$tokeep = [];
// Find which fields have actually changed definition
// in a way that we need to tweak them for this DB type.
foreach ($same as $name) {
if ($compareCallback) {
$same = call_user_func($compareCallback, $old[$name], $new[$name]);
} else {
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$same = ($old[$name] == $new[$name]);
}
if ($same) {
$tokeep[] = $name;
continue;
}
$tomod[] = $name;
}
return [
'add' => $toadd,
'del' => $todrop,
'mod' => $tomod,
'keep' => $tokeep,
'count' => count($toadd) + count($todrop) + count($tomod)
];
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}
/**
* Append phrase(s) to an array of partial ALTER TABLE chunks in order
* to add the given column definition to the table.
*
* @param array $phrase
* @param string $columnName
* @param array $cd
*/
public function appendAlterAddColumn(array &$phrase, string $columnName, array $cd)
{
$phrase[] = 'ADD COLUMN ' .
$this->quoteIdentifier($columnName) .
' ' .
$this->columnSql($columnName, $cd);
}
/**
* Append phrase(s) to an array of partial ALTER TABLE chunks in order
* to alter the given column from its old state to a new one.
*
* @param array $phrase
* @param string $columnName
* @param array $old previous column definition as found in DB
* @param array $cd current column definition
*/
public function appendAlterModifyColumn(array &$phrase, string $columnName, array $old, array $cd)
{
$phrase[] = 'MODIFY COLUMN ' .
$this->quoteIdentifier($columnName) .
' ' .
$this->columnSql($columnName, $cd);
}
/**
* Append phrase(s) to an array of partial ALTER TABLE chunks in order
* to drop the given column definition from the table.
*
* @param array $phrase
* @param string $columnName
*/
public function appendAlterDropColumn(array &$phrase, $columnName)
{
$phrase[] = 'DROP COLUMN ' . $this->quoteIdentifier($columnName);
}
public function appendAlterAddUnique(array &$phrase, $keyName, array $def)
{
$sql = [];
$sql[] = 'ADD';
$this->appendUniqueKeyDef($sql, $keyName, $def);
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$phrase[] = implode(' ', $sql);
}
public function appendAlterAddForeign(array &$phrase, $keyName, array $def)
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{
$sql = [];
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$sql[] = 'ADD';
$this->appendForeignKeyDef($sql, $keyName, $def);
$phrase[] = implode(' ', $sql);
}
public function appendAlterAddPrimary(array &$phrase, array $def)
{
$sql = [];
$sql[] = 'ADD';
$this->appendPrimaryKeyDef($sql, $def);
$phrase[] = implode(' ', $sql);
}
public function appendAlterDropPrimary(array &$phrase, string $tableName)
{
$phrase[] = 'DROP CONSTRAINT PRIMARY KEY';
}
public function appendAlterDropUnique(array &$phrase, $keyName)
{
$phrase[] = 'DROP CONSTRAINT ' . $keyName;
}
public function appendAlterDropForeign(array &$phrase, $keyName)
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{
$phrase[] = 'DROP FOREIGN KEY ' . $keyName;
}
public function appendAlterExtras(array &$phrase, $tableName, array $def)
{
// no-op
}
/**
* Quote a db/table/column identifier if necessary.
*
* @param string $name
* @return string
*/
public function quoteIdentifier($name)
{
return $this->conn->quoteIdentifier($name);
}
public function quoteDefaultValue($cd)
{
if (in_array($cd['type'], ['datetime', 'timestamp']) && $cd['default'] === 'CURRENT_TIMESTAMP') {
return $cd['default'];
} else {
return $this->quoteValue($cd['default']);
}
}
public function quoteValue($val)
{
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return $this->conn->quoteSmart($val);
}
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/**
* Returns the array of names from an array of
* ColumnDef objects.
*
* @param array $cds array of ColumnDef objects
*
* @return array strings for name values
*/
protected function _names($cds)
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{
$names = [];
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foreach ($cds as $cd) {
$names[] = $cd->name;
}
return $names;
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}
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/**
* Get a ColumnDef from an array matching
* name.
*
* @param array $cds Array of ColumnDef objects
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* @param string $name Name of the column
*
* @return ColumnDef matching item or null if no match.
*/
protected function _byName($cds, $name)
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{
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foreach ($cds as $cd) {
if ($cd->name == $name) {
return $cd;
}
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}
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return null;
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}
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/**
* Return the proper SQL for creating or
* altering a column.
*
* Appropriate for use in CREATE TABLE or
* ALTER TABLE statements.
*
* @param string $name column name to create
* @param array $cd column to create
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*
* @return string correct SQL for that column
*/
public function columnSql(string $name, array $cd)
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{
$line = [];
$line[] = $this->typeAndSize($name, $cd);
if (isset($cd['default'])) {
$line[] = 'default';
$line[] = $this->quoteDefaultValue($cd);
}
if (!empty($cd['not null'])) {
$line[] = 'NOT NULL';
} else {
$line[] = 'NULL';
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}
return implode(' ', $line);
}
/**
*
* @param string $column canonical type name in defs
* @return string native DB type name
*/
public function mapType($column)
{
return $column;
}
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public function typeAndSize(string $name, array $column)
{
//$type = $this->mapType($column)['type'];
$type = $column['type'];
if (isset($column['size'])) {
$type = $column['size'] . $type;
}
$lengths = [];
if (isset($column['precision'])) {
$lengths[] = $column['precision'];
if (isset($column['scale'])) {
$lengths[] = $column['scale'];
}
} elseif (isset($column['length'])) {
$lengths[] = $column['length'];
}
if ($lengths) {
return $type . '(' . implode(',', $lengths) . ')';
} else {
return $type;
}
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}
/**
* Convert an old-style set of ColumnDef objects into the current
* Drupal-style schema definition array, for backwards compatibility
* with plugins written for 0.9.x.
*
* @param string $tableName
* @param array $defs : array of ColumnDef objects
* @return array
*/
protected function oldToNew($tableName, array $defs)
{
$table = [];
$prefixes = [
'tiny',
'small',
'medium',
'big',
];
foreach ($defs as $cd) {
$column = [];
$column['type'] = $cd->type;
foreach ($prefixes as $prefix) {
if (substr($cd->type, 0, strlen($prefix)) == $prefix) {
$column['type'] = substr($cd->type, strlen($prefix));
$column['size'] = $prefix;
break;
}
}
if ($cd->size) {
if ($cd->type == 'varchar' || $cd->type == 'char') {
$column['length'] = $cd->size;
}
}
if (!$cd->nullable) {
$column['not null'] = true;
}
if ($cd->auto_increment) {
$column['type'] = 'serial';
}
if ($cd->default) {
$column['default'] = $cd->default;
}
$table['fields'][$cd->name] = $column;
if ($cd->key == 'PRI') {
// If multiple columns are defined as primary key,
// we'll pile them on in sequence.
if (!isset($table['primary key'])) {
$table['primary key'] = [];
}
$table['primary key'][] = $cd->name;
} elseif ($cd->key === 'MUL') {
// Individual multiple-value indexes are only per-column
// using the old ColumnDef syntax.
$idx = "{$tableName}_{$cd->name}_idx";
$table['indexes'][$idx] = [$cd->name];
} elseif ($cd->key === 'UNI') {
// Individual unique-value indexes are only per-column
// using the old ColumnDef syntax.
$idx = "{$tableName}_{$cd->name}_idx";
$table['unique keys'][$idx] = [$cd->name];
}
}
return $table;
}
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/**
* Filter the given table definition array to match features available
* in this database.
*
* This lets us strip out unsupported things like comments, foreign keys,
* or type variants that we wouldn't get back from getTableDef().
*
* @param string $tableName
* @param array $tableDef
* @return array
*/
public function filterDef(string $tableName, array $tableDef)
{
foreach ($tableDef['fields'] as $name => &$col) {
if (array_key_exists('default', $col) && is_null($col['default'])) {
unset($col['default']);
}
if (array_key_exists('not null', $col) && $col['not null'] !== true) {
unset($col['not null']);
}
}
return $tableDef;
}
/**
* Validate a table definition array, checking for basic structure.
*
* If necessary, converts from an old-style array of ColumnDef objects.
*
* @param string $tableName
* @param array $def : table definition array
* @return array validated table definition array
*
* @throws Exception on wildly invalid input
*/
public function validateDef($tableName, array $def)
{
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if (isset($def[0]) && $def[0] instanceof ColumnDef) {
$def = $this->oldToNew($tableName, $def);
}
// A few quick checks :D
if (!isset($def['fields'])) {
throw new Exception("Invalid table definition for $tableName: no fields.");
}
return $def;
}
/**
* Pull info from the query into a fun-fun array of dooooom
*
* @param string $sql
* @return array of arrays
* @throws PEAR_Exception
*/
protected function fetchQueryData($sql)
{
global $_PEAR;
$res = $this->conn->query($sql);
if ($_PEAR->isError($res)) {
PEAR_ErrorToPEAR_Exception($res);
}
$out = [];
$row = [];
while ($res->fetchInto($row, DB_FETCHMODE_ASSOC)) {
$out[] = $row;
}
$res->free();
return $out;
}
public function renameTable(string $old_name, string $new_name) : bool
{
try {
$this->getTableDef($old_name);
try {
$this->getTableDef($new_name);
// New table exists, can't work
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throw new ServerException("Both table {$old_name} and {$new_name} exist. You're on your own.");
} catch (SchemaTableMissingException $e) {
// New table doesn't exist, carry on
}
} catch (SchemaTableMissingException $e) {
// Already renamed, or no previous table, so we're done
return true;
}
return $this->runSqlSet([
'ALTER TABLE ' . $this->quoteIdentifier($old_name) .
' RENAME TO ' . $this->quoteIdentifier($new_name) . ';',
]);
}
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}
class SchemaTableMissingException extends Exception
{
// no-op
}