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471 lines
16 KiB
471 lines
16 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Entry query builder.
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*
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* @package mod_glossary
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* @copyright 2015 Frédéric Massart - FMCorz.net
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**
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* Entry query builder class.
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*
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* The purpose of this class is to avoid duplicating SQL statements to fetch entries
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* which are very similar with each other. This builder is not meant to be smart, it
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* will not out rule any previously set condition, or join, etc...
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*
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* You should be using this builder just like you would be creating your SQL query. Only
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* some methods are shorthands to avoid logic duplication and common mistakes.
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*
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* @package mod_glossary
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* @copyright 2015 Frédéric Massart - FMCorz.net
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @since Moodle 3.1
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*/
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class mod_glossary_entry_query_builder {
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/** Alias for table glossary_alias. */
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const ALIAS_ALIAS = 'ga';
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/** Alias for table glossary_categories. */
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const ALIAS_CATEGORIES = 'gc';
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/** Alias for table glossary_entries_categories. */
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const ALIAS_ENTRIES_CATEGORIES = 'gec';
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/** Alias for table glossary_entries. */
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const ALIAS_ENTRIES = 'ge';
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/** Alias for table user. */
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const ALIAS_USER = 'u';
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/** Include none of the entries to approve. */
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const NON_APPROVED_NONE = 'na_none';
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/** Including all the entries. */
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const NON_APPROVED_ALL = 'na_all';
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/** Including only the entries to be approved. */
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const NON_APPROVED_ONLY = 'na_only';
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/** Including my entries to be approved. */
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const NON_APPROVED_SELF = 'na_self';
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/** @var array Raw SQL statements representing the fields to select. */
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protected $fields = array();
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/** @var array Raw SQL statements representing the JOINs to make. */
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protected $joins = array();
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/** @var string Raw SQL statement representing the FROM clause. */
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protected $from;
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/** @var object The glossary we are fetching from. */
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protected $glossary;
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/** @var int The number of records to fetch from. */
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protected $limitfrom = 0;
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/** @var int The number of records to fetch. */
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protected $limitnum = 0;
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/** @var array List of SQL parameters. */
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protected $params = array();
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/** @var array Raw SQL statements representing the ORDER clause. */
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protected $order = array();
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/** @var array Raw SQL statements representing the WHERE clause. */
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protected $where = array();
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/**
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* Constructor.
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*
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* @param object $glossary The glossary.
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*/
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public function __construct($glossary = null) {
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$this->from = sprintf('FROM {glossary_entries} %s', self::ALIAS_ENTRIES);
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if (!empty($glossary)) {
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$this->glossary = $glossary;
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$this->where[] = sprintf('(%s.glossaryid = :gid OR %s.sourceglossaryid = :gid2)',
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self::ALIAS_ENTRIES, self::ALIAS_ENTRIES);
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$this->params['gid'] = $glossary->id;
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$this->params['gid2'] = $glossary->id;
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}
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}
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/**
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* Add a field to select.
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*
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* @param string $field The field, or *.
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* @param string $table The table name, without the prefix 'glossary_'.
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* @param string $alias An alias for the field.
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*/
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public function add_field($field, $table, $alias = null) {
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$field = self::resolve_field($field, $table);
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if (!empty($alias)) {
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$field .= ' AS ' . $alias;
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}
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$this->fields[] = $field;
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}
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/**
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* Adds the user fields.
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*
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* @return void
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*/
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public function add_user_fields() {
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$this->fields[] = user_picture::fields('u', null, 'userdataid', 'userdata');
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}
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/**
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* Internal method to build the query.
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*
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* @param bool $count Query to count?
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* @return string The SQL statement.
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*/
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protected function build_query($count = false) {
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$sql = 'SELECT ';
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if ($count) {
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$sql .= 'COUNT(\'x\') ';
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} else {
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$sql .= implode(', ', $this->fields) . ' ';
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}
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$sql .= $this->from . ' ';
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$sql .= implode(' ', $this->joins) . ' ';
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if (!empty($this->where)) {
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$sql .= 'WHERE (' . implode(') AND (', $this->where) . ') ';
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}
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if (!$count && !empty($this->order)) {
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$sql .= 'ORDER BY ' . implode(', ', $this->order);
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}
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return $sql;
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}
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/**
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* Count the records.
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*
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* @return int The number of records.
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*/
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public function count_records() {
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global $DB;
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return $DB->count_records_sql($this->build_query(true), $this->params);
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}
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/**
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* Filter a field using a letter.
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*
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* @param string $letter The letter.
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* @param string $finalfield The SQL statement representing the field.
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*/
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protected function filter_by_letter($letter, $finalfield) {
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global $DB;
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$letter = core_text::strtoupper($letter);
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$len = core_text::strlen($letter);
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$sql = $DB->sql_substr(sprintf('upper(%s)', $finalfield), 1, $len);
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$this->where[] = "$sql = :letter";
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$this->params['letter'] = $letter;
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}
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/**
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* Filter a field by special characters.
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*
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* @param string $finalfield The SQL statement representing the field.
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*/
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protected function filter_by_non_letter($finalfield) {
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global $DB;
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$alphabet = explode(',', get_string('alphabet', 'langconfig'));
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list($nia, $aparams) = $DB->get_in_or_equal($alphabet, SQL_PARAMS_NAMED, 'nonletter', false);
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$sql = $DB->sql_substr(sprintf('upper(%s)', $finalfield), 1, 1);
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$this->where[] = "$sql $nia";
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$this->params = array_merge($this->params, $aparams);
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}
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/**
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* Filter the author by letter.
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*
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* @param string $letter The letter.
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* @param bool $firstnamefirst Whether or not the firstname is first in the author's name.
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*/
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public function filter_by_author_letter($letter, $firstnamefirst = false) {
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$field = self::get_fullname_field($firstnamefirst);
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$this->filter_by_letter($letter, $field);
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}
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/**
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* Filter the author by special characters.
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*
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* @param bool $firstnamefirst Whether or not the firstname is first in the author's name.
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*/
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public function filter_by_author_non_letter($firstnamefirst = false) {
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$field = self::get_fullname_field($firstnamefirst);
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$this->filter_by_non_letter($field);
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}
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/**
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* Filter the concept by letter.
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*
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* @param string $letter The letter.
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*/
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public function filter_by_concept_letter($letter) {
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$this->filter_by_letter($letter, self::resolve_field('concept', 'entries'));
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}
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/**
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* Filter the concept by special characters.
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*
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* @return void
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*/
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public function filter_by_concept_non_letter() {
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$this->filter_by_non_letter(self::resolve_field('concept', 'entries'));
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}
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/**
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* Filter non approved entries.
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*
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* @param string $constant One of the NON_APPROVED_* constants.
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* @param int $userid The user ID when relevant, otherwise current user.
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*/
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public function filter_by_non_approved($constant, $userid = null) {
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global $USER;
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if (!$userid) {
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$userid = $USER->id;
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}
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if ($constant === self::NON_APPROVED_ALL) {
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// Nothing to do.
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} else if ($constant === self::NON_APPROVED_SELF) {
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$this->where[] = sprintf('%s != 0 OR %s = :toapproveuserid',
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self::resolve_field('approved', 'entries'), self::resolve_field('userid', 'entries'));
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$this->params['toapproveuserid'] = $USER->id;
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} else if ($constant === self::NON_APPROVED_NONE) {
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$this->where[] = sprintf('%s != 0', self::resolve_field('approved', 'entries'));
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} else if ($constant === self::NON_APPROVED_ONLY) {
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$this->where[] = sprintf('%s = 0', self::resolve_field('approved', 'entries'));
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} else {
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throw new coding_exception('Invalid constant');
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}
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}
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/**
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* Filter by concept or alias.
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*
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* This requires the alias table to be joined in the query. See {@link self::join_alias()}.
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*
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* @param string $term What the concept or aliases should be.
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*/
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public function filter_by_term($term) {
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$this->where[] = sprintf("(%s = :filterterma OR %s = :filtertermb)",
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self::resolve_field('concept', 'entries'),
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self::resolve_field('alias', 'alias'));
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$this->params['filterterma'] = $term;
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$this->params['filtertermb'] = $term;
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}
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/**
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* Convenience method to get get the SQL statement for the full name.
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*
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* @param bool $firstnamefirst Whether or not the firstname is first in the author's name.
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* @return string The SQL statement.
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*/
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public static function get_fullname_field($firstnamefirst = false) {
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global $DB;
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if ($firstnamefirst) {
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return $DB->sql_fullname(self::resolve_field('firstname', 'user'), self::resolve_field('lastname', 'user'));
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}
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return $DB->sql_fullname(self::resolve_field('lastname', 'user'), self::resolve_field('firstname', 'user'));
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}
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/**
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* Get the records.
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*
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* @return array
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*/
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public function get_records() {
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global $DB;
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return $DB->get_records_sql($this->build_query(), $this->params, $this->limitfrom, $this->limitnum);
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}
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/**
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* Get the recordset.
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*
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* @return moodle_recordset
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*/
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public function get_recordset() {
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global $DB;
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return $DB->get_recordset_sql($this->build_query(), $this->params, $this->limitfrom, $this->limitnum);
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}
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/**
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* Retrieve a user object from a record.
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*
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* This comes handy when {@link self::add_user_fields} was used.
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*
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* @param stdClass $record The record.
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* @return stdClass A user object.
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*/
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public static function get_user_from_record($record) {
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return user_picture::unalias($record, null, 'userdataid', 'userdata');
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}
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/**
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* Join the alias table.
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*
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* Note that this may cause the same entry to be returned more than once. You might want
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* to add a distinct on the entry id.
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*
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* @return void
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*/
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public function join_alias() {
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$this->joins[] = sprintf('LEFT JOIN {glossary_alias} %s ON %s = %s',
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self::ALIAS_ALIAS, self::resolve_field('id', 'entries'), self::resolve_field('entryid', 'alias'));
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}
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/**
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* Join on the category tables.
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*
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* Depending on the category passed the joins will be different. This is due to the display
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* logic that assumes that when displaying all categories the non categorised entries should
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* not be returned, etc...
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*
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* @param int $categoryid The category ID, or GLOSSARY_SHOW_* constant.
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*/
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public function join_category($categoryid) {
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if ($categoryid === GLOSSARY_SHOW_ALL_CATEGORIES) {
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$this->joins[] = sprintf('JOIN {glossary_entries_categories} %s ON %s = %s',
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self::ALIAS_ENTRIES_CATEGORIES, self::resolve_field('id', 'entries'),
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self::resolve_field('entryid', 'entries_categories'));
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$this->joins[] = sprintf('JOIN {glossary_categories} %s ON %s = %s',
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self::ALIAS_CATEGORIES, self::resolve_field('id', 'categories'),
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self::resolve_field('categoryid', 'entries_categories'));
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} else if ($categoryid === GLOSSARY_SHOW_NOT_CATEGORISED) {
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$this->joins[] = sprintf('LEFT JOIN {glossary_entries_categories} %s ON %s = %s',
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self::ALIAS_ENTRIES_CATEGORIES, self::resolve_field('id', 'entries'),
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self::resolve_field('entryid', 'entries_categories'));
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} else {
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$this->joins[] = sprintf('JOIN {glossary_entries_categories} %s ON %s = %s AND %s = :joincategoryid',
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self::ALIAS_ENTRIES_CATEGORIES, self::resolve_field('id', 'entries'),
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self::resolve_field('entryid', 'entries_categories'),
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self::resolve_field('categoryid', 'entries_categories'));
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$this->params['joincategoryid'] = $categoryid;
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}
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}
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/**
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* Join the user table.
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*
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* @param bool $strict When strict uses a JOIN rather than a LEFT JOIN.
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*/
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public function join_user($strict = false) {
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$join = $strict ? 'JOIN' : 'LEFT JOIN';
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$this->joins[] = sprintf("$join {user} %s ON %s = %s",
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self::ALIAS_USER, self::resolve_field('id', 'user'), self::resolve_field('userid', 'entries'));
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}
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/**
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* Limit the number of records to fetch.
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* @param int $from Fetch from.
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* @param int $num Number to fetch.
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*/
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public function limit($from, $num) {
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$this->limitfrom = $from;
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$this->limitnum = $num;
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}
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/**
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* Normalise a direction.
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*
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* This ensures that the value is either ASC or DESC.
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*
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* @param string $direction The desired direction.
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* @return string ASC or DESC.
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*/
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protected function normalize_direction($direction) {
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$direction = core_text::strtoupper($direction);
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if ($direction == 'DESC') {
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return 'DESC';
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}
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return 'ASC';
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}
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/**
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* Order by a field.
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*
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* @param string $field The field, or *.
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* @param string $table The table name, without the prefix 'glossary_'.
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* @param string $direction ASC, or DESC.
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*/
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public function order_by($field, $table, $direction = '') {
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$direction = self::normalize_direction($direction);
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$this->order[] = self::resolve_field($field, $table) . ' ' . $direction;
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}
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/**
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* Order by author name.
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*
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* @param bool $firstnamefirst Whether or not the firstname is first in the author's name.
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* @param string $direction ASC, or DESC.
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*/
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public function order_by_author($firstnamefirst = false, $direction = '') {
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$field = self::get_fullname_field($firstnamefirst);
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$direction = self::normalize_direction($direction);
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$this->order[] = $field . ' ' . $direction;
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}
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/**
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* Convenience method to transform a field into SQL statement.
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*
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* @param string $field The field, or *.
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* @param string $table The table name, without the prefix 'glossary_'.
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* @return string SQL statement.
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*/
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protected static function resolve_field($field, $table) {
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$prefix = constant(__CLASS__ . '::ALIAS_' . core_text::strtoupper($table));
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return sprintf('%s.%s', $prefix, $field);
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}
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/**
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* Simple where conditions.
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*
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* @param string $field The field, or *.
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* @param string $table The table name, without the prefix 'glossary_'.
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* @param mixed $value The value to be equal to.
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*/
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public function where($field, $table, $value) {
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static $i = 0;
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$sql = self::resolve_field($field, $table) . ' ';
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if ($value === null) {
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$sql .= 'IS NULL';
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} else {
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$param = 'where' . $i++;
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$sql .= " = :$param";
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$this->params[$param] = $value;
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}
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$this->where[] = $sql;
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}
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}
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