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<?php
/**
*
* Index, constraint and alter methods for DB_Table usage with
* PEAR::DB as backend. (Code adopted from PEAR::MDB2)
*
* @category DB
*
* @package DB_Table
*
* @author Mark Wiesemann <wiesemann@php.net>
*
* @license http://www.gnu.org/copyleft/lesser.html LGPL
*
* @version $Id: sqlite.php,v 1.2 2006/02/26 15:54:56 wiesemann Exp $
*
*/
require_once 'DB/Table.php';
/**
*
* Index, constraint and alter methods for DB_Table usage with
* PEAR::DB as backend. (Code adopted from PEAR::MDB2)
*
* @category DB
*
* @package DB_Table
*
* @author Mark Wiesemann <wiesemann@php.net>
*
*/
class DB_Table_Manager_sqlite {
/**
*
* The PEAR DB object that connects to the database.
*
* @access private
*
* @var object
*
*/
var $_db = null;
/**
* list all indexes in a table
*
* @param string $table name of table that should be used in method
* @return mixed data array on success, a PEAR error on failure
* @access public
*/
function listTableIndexes($table)
{
$query = "SELECT sql FROM sqlite_master WHERE type='index' AND ";
$query.= "LOWER(tbl_name)='".strtolower($table)."'";
$query.= " AND sql NOT NULL ORDER BY name";
$indexes = $this->_db->getCol($query);
if (PEAR::isError($indexes)) {
return $indexes;
}
$result = array();
foreach ($indexes as $sql) {
if (preg_match("/^create index ([^ ]*) on /i", $sql, $tmp)) {
$result[$tmp[1]] = true;
}
}
$result = array_change_key_case($result, CASE_LOWER);
return array_keys($result);
}
/**
* list all constraints in a table
*
* @param string $table name of table that should be used in method
* @return mixed data array on success, a PEAR error on failure
* @access public
*/
function listTableConstraints($table)
{
$query = "SELECT sql FROM sqlite_master WHERE type='index' AND ";
$query.= "LOWER(tbl_name)='".strtolower($table)."'";
$query.= " AND sql NOT NULL ORDER BY name";
$indexes = $this->_db->getCol($query);
if (PEAR::isError($indexes)) {
return $indexes;
}
$result = array();
foreach ($indexes as $sql) {
if (preg_match("/^create unique index ([^ ]*) on /i", $sql, $tmp)) {
$result[$tmp[1]] = true;
}
}
$result = array_change_key_case($result, CASE_LOWER);
return array_keys($result);
}
/**
* get the structure of an index into an array
*
* @param string $table name of table that should be used in method
* @param string $index_name name of index that should be used in method
* @return mixed data array on success, a PEAR error on failure
* @access public
*/
function getTableIndexDefinition($table, $index_name)
{
$query = "SELECT sql FROM sqlite_master WHERE type='index' AND ";
$query.= "LOWER(name)='".strtolower($index_name)."' AND LOWER(tbl_name)='".strtolower($table)."'";
$query.= " AND sql NOT NULL ORDER BY name";
$sql = $this->_db->getOne($query);
if (PEAR::isError($sql)) {
return $sql;
}
$sql = strtolower($sql);
$start_pos = strpos($sql, '(');
$end_pos = strrpos($sql, ')');
$column_names = substr($sql, $start_pos+1, $end_pos-$start_pos-1);
$column_names = split(',', $column_names);
$definition = array();
$count = count($column_names);
for ($i=0; $i<$count; ++$i) {
$column_name = strtok($column_names[$i]," ");
$collation = strtok(" ");
$definition['fields'][$column_name] = array();
if (!empty($collation)) {
$definition['fields'][$column_name]['sorting'] =
($collation=='ASC' ? 'ascending' : 'descending');
}
}
return $definition;
}
/**
* get the structure of a constraint into an array
*
* @param string $table name of table that should be used in method
* @param string $index_name name of index that should be used in method
* @return mixed data array on success, a PEAR error on failure
* @access public
*/
function getTableConstraintDefinition($table, $index_name)
{
$query = "SELECT sql FROM sqlite_master WHERE type='index' AND ";
$query.= "LOWER(name)='".strtolower($index_name)."' AND LOWER(tbl_name)='".strtolower($table)."'";
$query.= " AND sql NOT NULL ORDER BY name";
$sql = $this->_db->getOne($query);
if (PEAR::isError($sql)) {
return $sql;
}
$sql = strtolower($sql);
$start_pos = strpos($sql, '(');
$end_pos = strrpos($sql, ')');
$column_names = substr($sql, $start_pos+1, $end_pos-$start_pos-1);
$column_names = split(',', $column_names);
$definition = array();
$definition['unique'] = true;
$count = count($column_names);
for ($i=0; $i<$count; ++$i) {
$column_name = strtok($column_names[$i]," ");
$collation = strtok(" ");
$definition['fields'][$column_name] = array();
if (!empty($collation)) {
$definition['fields'][$column_name]['sorting'] =
($collation=='ASC' ? 'ascending' : 'descending');
}
}
return $definition;
}
/**
* drop existing index
*
* @param string $table name of table that should be used in method
* @param string $name name of the index to be dropped
* @return mixed DB_OK on success, a PEAR error on failure
* @access public
*/
function dropIndex($table, $name)
{
return $this->_db->query("DROP INDEX $name");
}
/**
* drop existing constraint
*
* @param string $table name of table that should be used in method
* @param string $name name of the constraint to be dropped
* @return mixed DB_OK on success, a PEAR error on failure
* @access public
*/
function dropConstraint($table, $name)
{
if (strtolower($name) == 'primary') {
return DB_Table::throwError(
DB_TABLE_ERR_ALTER_INDEX_IMPOS,
'(primary)'
);
}
return $this->_db->query("DROP INDEX $name");
}
/**
* alter an existing table
*
* @param string $name name of the table that is intended to be changed.
* @param array $changes associative array that contains the details of each type
* of change that is intended to be performed. The types of
* changes that are currently supported are defined as follows:
*
* name
*
* New name for the table.
*
* add
*
* Associative array with the names of fields to be added as
* indexes of the array. The value of each entry of the array
* should be set to another associative array with the properties
* of the fields to be added. The properties of the fields should
* be the same as defined by the Metabase parser.
*
*
* remove
*
* Associative array with the names of fields to be removed as indexes
* of the array. Currently the values assigned to each entry are ignored.
* An empty array should be used for future compatibility.
*
* rename
*
* Associative array with the names of fields to be renamed as indexes
* of the array. The value of each entry of the array should be set to
* another associative array with the entry named name with the new
* field name and the entry named Declaration that is expected to contain
* the portion of the field declaration already in DBMS specific SQL code
* as it is used in the CREATE TABLE statement.
*
* change
*
* Associative array with the names of the fields to be changed as indexes
* of the array. Keep in mind that if it is intended to change either the
* name of a field and any other properties, the change array entries
* should have the new names of the fields as array indexes.
*
* The value of each entry of the array should be set to another associative
* array with the properties of the fields to that are meant to be changed as
* array entries. These entries should be assigned to the new values of the
* respective properties. The properties of the fields should be the same
* as defined by the Metabase parser.
*
* Example
* array(
* 'name' => 'userlist',
* 'add' => array(
* 'quota' => array(
* 'type' => 'integer',
* 'unsigned' => 1
* )
* ),
* 'remove' => array(
* 'file_limit' => array(),
* 'time_limit' => array()
* ),
* 'change' => array(
* 'name' => array(
* 'length' => '20',
* 'definition' => array(
* 'type' => 'text',
* 'length' => 20,
* ),
* )
* ),
* 'rename' => array(
* 'sex' => array(
* 'name' => 'gender',
* 'definition' => array(
* 'type' => 'text',
* 'length' => 1,
* 'default' => 'M',
* ),
* )
* )
* )
*
* @param boolean $check (ignored in DB_Table)
* @access public
*
* @return mixed DB_OK on success, a PEAR error on failure
*/
function alterTable($name, $changes, $check)
{
$version = $this->_getServerVersion();
foreach ($changes as $change_name => $change) {
switch ($change_name) {
case 'add':
if ($version['major'] >= 3 && $version['minor'] >= 1) {
break;
}
case 'name':
if ($version['major'] >= 3 && $version['minor'] >= 1) {
break;
}
case 'remove':
case 'change':
case 'rename':
default:
return DB_Table::throwError(DB_TABLE_ERR_ALTER_TABLE_IMPOS);
}
}
$query = '';
if (array_key_exists('name', $changes)) {
$change_name = $this->_db->quoteIdentifier($changes['name']);
$query .= 'RENAME TO ' . $change_name;
}
if (array_key_exists('add', $changes)) {
foreach ($changes['add'] as $field_name => $field) {
if ($query) {
$query.= ', ';
}
$query.= 'ADD COLUMN ' . $field_name . ' ' . $field;
}
}
if (!$query) {
return DB_OK;
}
$name = $this->_db->quoteIdentifier($name);
return $this->_db->query("ALTER TABLE $name $query");
}
/**
* return version information about the server
*
* @param string $native determines if the raw version string should be returned
* @return mixed array/string with version information or MDB2 error object
* @access private
*/
function _getServerVersion($native = false)
{
if (!function_exists('sqlite_libversion')) {
return 0; // error
}
$server_info = sqlite_libversion();
if (!$native) {
$tmp = explode('.', $server_info, 3);
$server_info = array(
'major' => isset($tmp[0]) ? $tmp[0] : null,
'minor' => isset($tmp[1]) ? $tmp[1] : null,
'patch' => isset($tmp[2]) ? $tmp[2] : null,
'extra' => null,
'native' => $server_info,
);
}
return $server_info;
}
}
?>
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