sqlite.php

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                } elseif ('SET NULL' == $fkdef['ondelete']) {
                    $sql_delete = sprintf($query, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete') . $setnull_action. '; END;';
                } elseif ('SET DEFAULT' == $fkdef['ondelete']) {
                    $sql_delete = sprintf($query, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete') . $setdefault_action. '; END;';
                } elseif ('NO ACTION' == $fkdef['ondelete']) {
                    $sql_delete = sprintf($query.$restrict_action, $trigger_names['pk_delete'], 'AFTER DELETE', 'delete')  . '; END;';
                } else {
                    //'RESTRICT'
                    $sql_delete = sprintf($query.$restrict_action, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete') . '; END;';
                }

                if (PEAR::isError($result)) {
                    return $result;
                }
                $result = $db->exec($sql_delete);
                if (PEAR::isError($result)) {
                    return $result;
                }
                $result = $db->exec($sql_update);
                if (PEAR::isError($result)) {
                    return $result;
                }
            }
        }
        if (PEAR::isError($result)) {
            return $result;
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ dropTable()

    /**
     * drop an existing table
     *
     * @param string $name name of the table that should be dropped
     * @return mixed MDB2_OK on success, a MDB2 error on failure
     * @access public
     */
    function dropTable($name)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }
        
        //delete the triggers associated to existing FK constraints
        $constraints = $this->listTableConstraints($name);
        if (!PEAR::isError($constraints) && !empty($constraints)) {
            $db->loadModule('Reverse', null, true);
            foreach ($constraints as $constraint) {
                $definition = $db->reverse->getTableConstraintDefinition($name, $constraint);
                if (!PEAR::isError($definition) && !empty($definition['foreign'])) {
                    $result = $this->_dropFKTriggers($name, $constraint, $definition['references']['table']);
                    if (PEAR::isError($result)) {
                        return $result;
                    }
                }
            }
        }

        $name = $db->quoteIdentifier($name, true);
        return $db->exec("DROP TABLE $name");
    }

    // }}}
    // {{{ vacuum()

    /**
     * Optimize (vacuum) all the tables in the db (or only the specified table)
     * and optionally run ANALYZE.
     *
     * @param string $table table name (all the tables if empty)
     * @param array  $options an array with driver-specific options:
     *               - timeout [int] (in seconds) [mssql-only]
     *               - analyze [boolean] [pgsql and mysql]
     *               - full [boolean] [pgsql-only]
     *               - freeze [boolean] [pgsql-only]
     *
     * @return mixed MDB2_OK success, a MDB2 error on failure
     * @access public
     */
    function vacuum($table = null, $options = array())
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $query = 'VACUUM';
        if (!empty($table)) {
            $query .= ' '.$db->quoteIdentifier($table, true);
        }
        return $db->exec($query);
    }

    // }}}
    // {{{ alterTable()

    /**
     * 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 MDB2 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 MDB2 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 $check     indicates whether the function should just check if the DBMS driver
     *                             can perform the requested table alterations if the value is true or
     *                             actually perform them otherwise.
     * @access public
     *
      * @return mixed MDB2_OK on success, a MDB2 error on failure
     */
    function alterTable($name, $changes, $check, $options = array())
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        foreach ($changes as $change_name => $change) {
            switch ($change_name) {
            case 'add':
            case 'remove':
            case 'change':
            case 'name':
            case 'rename':
                break;
            default:
                return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
                    'change type "'.$change_name.'" not yet supported', __FUNCTION__);
            }
        }

        if ($check) {
            return MDB2_OK;
        }

        $db->loadModule('Reverse', null, true);

        // actually sqlite 2.x supports no ALTER TABLE at all .. so we emulate it
        $fields = $db->manager->listTableFields($name);
        if (PEAR::isError($fields)) {
            return $fields;
        }

        $fields = array_flip($fields);
        foreach ($fields as $field => $value) {
            $definition = $db->reverse->getTableFieldDefinition($name, $field);
            if (PEAR::isError($definition)) {
                return $definition;
            }
            $fields[$field] = $definition[0];
        }

        $indexes = $db->manager->listTableIndexes($name);
        if (PEAR::isError($indexes)) {
            return $indexes;
        }

        $indexes = array_flip($indexes);
        foreach ($indexes as $index => $value) {
            $definition = $db->reverse->getTableIndexDefinition($name, $index);
            if (PEAR::isError($definition)) {
                return $definition;
            }
            $indexes[$index] = $definition;
        }

        $constraints = $db->manager->listTableConstraints($name);
        if (PEAR::isError($constraints)) {
            return $constraints;
        }

        if (!array_key_exists('foreign_keys', $options)) {
            $options['foreign_keys'] = array();
        }
        $constraints = array_flip($constraints);
        foreach ($constraints as $constraint => $value) {
            if (!empty($definition['primary'])) {
                if (!array_key_exists('primary', $options)) {
                    $options['primary'] = $definition['fields'];
                    //remove from the $constraint array, it's already handled by createTable()
                    unset($constraints[$constraint]);
                }
            } else {
                $c_definition = $db->reverse->getTableConstraintDefinition($name, $constraint);
                if (PEAR::isError($c_definition)) {
                    return $c_definition;
                }
                if (!empty($c_definition['foreign'])) {
                    if (!array_key_exists($constraint, $options['foreign_keys'])) {
                        $options['foreign_keys'][$constraint] = $c_definition;
                    }
                    //remove from the $constraint array, it's already handled by createTable()
                    unset($constraints[$constraint]);
                } else {
                    $constraints[$constraint] = $c_definition;
                }
            }
        }

        $name_new = $name;
        $create_order = $select_fields = array_keys($fields);
        foreach ($changes as $change_name => $change) {
            switch ($change_name) {
            case 'add':
                foreach ($change as $field_name => $field) {
                    $fields[$field_name] = $field;
                    $create_order[] = $field_name;
                }
                break;
            case 'remove':
                foreach ($change as $field_name => $field) {
                    unset($fields[$field_name]);
                    $select_fields = array_diff($select_fields, array($field_name));
                    $create_order = array_diff($create_order, array($field_name));
                }
                break;
            case 'change':
                foreach ($change as $field_name => $field) {
                    $fields[$field_name] = $field['definition'];
                }
                break;
            case 'name':
                $name_new = $change;
                break;
            case 'rename':
                foreach ($change as $field_name => $field) {
                    unset($fields[$field_name]);
                    $fields[$field['name']] = $field['definition'];
                    $create_order[array_search($field_name, $create_order)] = $field['name'];
                }
                break;
            default:
                return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
                    'change type "'.$change_name.'" not yet supported', __FUNCTION__);
            }
        }

        $data = null;
        if (!empty($select_fields)) {
            $query = 'SELECT '.implode(', ', $select_fields).' FROM '.$db->quoteIdentifier($name, true);
            $data = $db->queryAll($query, null, MDB2_FETCHMODE_ORDERED);
        }

        $result = $this->dropTable($name);
        if (PEAR::isError($result)) {
            return $result;
        }

        $result = $this->createTable($name_new, $fields, $options);
        if (PEAR::isError($result)) {
            return $result;
        }

        foreach ($indexes as $index => $definition) {
            $this->createIndex($name_new, $index, $definition);
        }

        foreach ($constraints as $constraint => $definition) {
            $this->createConstraint($name_new, $constraint, $definition);