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Commit 4e1b95db authored by Zach Copley's avatar Zach Copley
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Merge branch '0.9.x' into refactor-api 

* 0.9.x:
  make lib/schema.php phpcs-clean
parents daa8b473 87858a11
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Showing with 272 additions and 37 deletions
lib/schema.php
View file @ 4e1b95db
......@@ -50,15 +50,29 @@ class Schema
static $_single = null;
protected $conn = null;
/**
* Constructor. Only run once for singleton object.
*/
protected function __construct()
{
// XXX: there should be an easier way to do this.
$user = new User();
$this->conn = $user->getDatabaseConnection();
$user->free();
unset($user);
}
/**
* Main public entry point. Use this to get
* the singleton object.
*
* @return Schema the (single) Schema object
*/
static function get()
{
if (empty(self::$_single)) {
......@@ -67,6 +81,17 @@ class Schema
return self::$_single;
}
/**
* 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('DESCRIBE ' . $name);
......@@ -108,6 +133,18 @@ class Schema
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);
......@@ -121,12 +158,17 @@ class Schema
return null;
}
public function getIndexDef($table, $index)
{
return null;
}
public function createTable($name, $columns, $indices=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();
......@@ -145,13 +187,13 @@ class Schema
$sql .= $this->_columnSql($cd);
switch ($cd->key) {
case 'UNI':
case 'UNI':
$uniques[] = $cd->name;
break;
case 'PRI':
case 'PRI':
$primary[] = $cd->name;
break;
case 'MUL':
case 'MUL':
$indices[] = $cd->name;
break;
}
......@@ -171,8 +213,6 @@ class Schema
$sql .= "); ";
common_debug($sql);
$res =& $this->conn->query($sql);
if (PEAR::isError($res)) {
......@@ -182,6 +222,16 @@ class Schema
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 $name");
......@@ -193,7 +243,23 @@ class Schema
return true;
}
public function createIndex($table, $columnNames, $name = null)
/**
* 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);
......@@ -203,7 +269,9 @@ class Schema
$name = "$table_".implode("_", $columnNames)."_idx";
}
$res =& $this->conn->query("ALTER TABLE $table ADD INDEX $name (".implode(",", $columnNames).")");
$res =& $this->conn->query("ALTER TABLE $table ".
"ADD INDEX $name (".
implode(",", $columnNames).")");
if (PEAR::isError($res)) {
throw new Exception($res->getMessage());
......@@ -212,6 +280,15 @@ class Schema
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");
......@@ -223,6 +300,16 @@ class Schema
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);
......@@ -236,9 +323,21 @@ class Schema
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);
$sql = "ALTER TABLE $table MODIFY COLUMN " .
$this->_columnSql($columndef);
$res =& $this->conn->query($sql);
......@@ -249,6 +348,17 @@ class Schema
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 $columnName";
......@@ -262,7 +372,22 @@ class Schema
return true;
}
public function ensureTable($tableName, $columns, $indices=null)
/**
* 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
......@@ -270,7 +395,7 @@ class Schema
$td = $this->getTableDef($tableName);
} catch (Exception $e) {
if (preg_match('/no such table/', $e->getMessage())) {
return $this->createTable($tableName, $columns, $indices);
return $this->createTable($tableName, $columns);
} else {
throw $e;
}
......@@ -281,10 +406,8 @@ class Schema
$toadd = array_diff($new, $cur);
$todrop = array_diff($cur, $new);
$same = array_intersect($new, $cur);
$tomod = array();
$same = array_intersect($new, $cur);
$tomod = array();
foreach ($same as $m) {
$curCol = $this->_byName($td->columns, $m);
......@@ -307,6 +430,7 @@ class Schema
foreach ($toadd as $columnName) {
$cd = $this->_byName($columns, $columnName);
$phrase[] = 'ADD COLUMN ' . $this->_columnSql($cd);
}
......@@ -316,6 +440,7 @@ class Schema
foreach ($tomod as $columnName) {
$cd = $this->_byName($columns, $columnName);
$phrase[] = 'MODIFY COLUMN ' . $this->_columnSql($cd);
}
......@@ -330,7 +455,16 @@ class Schema
return true;
}
function _names($cds)
/**
* 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();
......@@ -341,7 +475,17 @@ class Schema
return $names;
}
function _byName($cds, $name)
/**
* 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 == $name) {
......@@ -352,7 +496,19 @@ class Schema
return null;
}
function _columnSql($cd)
/**
* 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} ";
......@@ -372,25 +528,71 @@ class Schema
}
}
/**
* A class encapsulating the structure of a table.
*
* @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 TableDef
{
/** name of the table */
public $name;
/** array of ColumnDef objects for the columns. */
public $columns;
}
/**
* A class encapsulating the structure of a column in a table.
*
* @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 ColumnDef
{
/** name of the column. */
public $name;
/** type of column, e.g. 'int', 'varchar' */
public $type;
/** size of the column. */
public $size;
/** boolean flag; can it be null? */
public $nullable;
/**
* type of key: null = no key; 'PRI' => primary;
* 'UNI' => unique key; 'MUL' => multiple values.
*/
public $key;
/** default value if any. */
public $default;
/** 'extra' stuff. Returned by MySQL, largely
* unused. */
public $extra;
/**
* Constructor.
*
* @param string $name name of the column
* @param string $type type of the column
* @param int $size size of the column
* @param boolean $nullable can this be null?
* @param string $key type of key
* @param value $default default value
* @param value $extra unused
*/
function __construct($name=null, $type=null, $size=null,
$nullable=true, $key=null, $default=null,
$extra=null) {
$extra=null)
{
$this->name = strtolower($name);
$this->type = strtolower($type);
$this->size = $size+0;
......@@ -400,6 +602,15 @@ class ColumnDef
$this->extra = $extra;
}
/**
* Compares this columndef with another to see
* if they're functionally equivalent.
*
* @param ColumnDef $other column to compare
*
* @return boolean true if equivalent, otherwise false.
*/
function equals($other)
{
return ($this->name == $other->name &&
......@@ -409,37 +620,61 @@ class ColumnDef
$this->key == $other->key);
}
function _typeMatch($other)
/**
* Does the type of this column match the
* type of the other column?
*
* Checks the type and size of a column. Tries
* to ignore differences between synonymous
* data types, like 'integer' and 'int'.
*
* @param ColumnDef $other other column to check
*
* @return boolean true if they're about equivalent
*/
private function _typeMatch($other)
{
switch ($this->type) {
case 'integer':
case 'int':
case 'integer':
case 'int':
return ($other->type == 'integer' ||
$other->type == 'int');
break;
default:
default:
return ($this->type == $other->type &&
$this->size == $other->size);
}
}
function _defaultMatch($other)
/**
* Does the default behaviour of this column match
* the other?
*
* @param ColumnDef $other other column to check
*
* @return boolean true if defaults are effectively the same.
*/
private function _defaultMatch($other)
{
return ((is_null($this->default) && is_null($other->default)) ||
($this->default == $other->default));
}
function _nullMatch($other)
/**
* Does the null behaviour of this column match
* the other?
*
* @param ColumnDef $other other column to check
*
* @return boolean true if these columns 'null' the same.
*/
private function _nullMatch($other)
{
return ((!is_null($this->default) && !is_null($other->default) &&
$this->default == $other->default) ||
($this->nullable == $other->nullable));
}
}
class IndexDef
{
public $name;
public $table;
public $columns;
}
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