/**
* This is a base class for all Query modules.
- * It provides some common functionality such as constructing various SQL queries.
- *
- * @addtogroup API
+ * It provides some common functionality such as constructing various SQL
+ * queries.
+ *
+ * @ingroup API
*/
abstract class ApiQueryBase extends ApiBase {
- private $mQueryModule, $mDb, $tables, $where, $fields, $options;
+ private $mQueryModule, $mDb, $tables, $where, $fields, $options, $join_conds;
public function __construct($query, $moduleName, $paramPrefix = '') {
parent :: __construct($query->getMain(), $moduleName, $paramPrefix);
$this->resetQueryParams();
}
+ /**
+ * Blank the internal arrays with query parameters
+ */
protected function resetQueryParams() {
$this->tables = array ();
$this->where = array ();
$this->fields = array ();
$this->options = array ();
+ $this->join_conds = array ();
}
+ /**
+ * Add a set of tables to the internal array
+ * @param $tables mixed Table name or array of table names
+ * @param $alias mixed Table alias, or null for no alias. Cannot be
+ * used with multiple tables
+ */
protected function addTables($tables, $alias = null) {
if (is_array($tables)) {
if (!is_null($alias))
$this->tables = array_merge($this->tables, $tables);
} else {
if (!is_null($alias))
- $tables = $this->getDB()->tableName($tables) . ' ' . $alias;
+ $tables = $this->getAliasedName($tables, $alias);
$this->tables[] = $tables;
}
}
+
+ /**
+ * Get the SQL for a table name with alias
+ * @param $table string Table name
+ * @param $alias string Alias
+ * @return string SQL
+ */
+ protected function getAliasedName($table, $alias) {
+ return $this->getDB()->tableName($table) . ' ' . $alias;
+ }
+
+ /**
+ * Add a set of JOIN conditions to the internal array
+ *
+ * JOIN conditions are formatted as array( tablename => array(jointype,
+ * conditions) e.g. array('page' => array('LEFT JOIN',
+ * 'page_id=rev_page')) . conditions may be a string or an
+ * addWhere()-style array
+ * @param $join_conds array JOIN conditions
+ */
+ protected function addJoinConds($join_conds) {
+ if(!is_array($join_conds))
+ ApiBase::dieDebug(__METHOD__, 'Join conditions have to be arrays');
+ $this->join_conds = array_merge($this->join_conds, $join_conds);
+ }
+ /**
+ * Add a set of fields to select to the internal array
+ * @param $value mixed Field name or array of field names
+ */
protected function addFields($value) {
if (is_array($value))
$this->fields = array_merge($this->fields, $value);
$this->fields[] = $value;
}
+ /**
+ * Same as addFields(), but add the fields only if a condition is met
+ * @param $value mixed See addFields()
+ * @param $condition bool If false, do nothing
+ * @return bool $condition
+ */
protected function addFieldsIf($value, $condition) {
if ($condition) {
$this->addFields($value);
return false;
}
+ /**
+ * Add a set of WHERE clauses to the internal array.
+ * Clauses can be formatted as 'foo=bar' or array('foo' => 'bar'),
+ * the latter only works if the value is a constant (i.e. not another field)
+ *
+ * If $value is an empty array, this function does nothing.
+ *
+ * For example, array('foo=bar', 'baz' => 3, 'bla' => 'foo') translates
+ * to "foo=bar AND baz='3' AND bla='foo'"
+ * @param $value mixed String or array
+ */
protected function addWhere($value) {
- if (is_array($value))
- $this->where = array_merge($this->where, $value);
+ if (is_array($value)) {
+ // Sanity check: don't insert empty arrays,
+ // Database::makeList() chokes on them
+ if ( count( $value ) )
+ $this->where = array_merge($this->where, $value);
+ }
else
$this->where[] = $value;
}
+ /**
+ * Same as addWhere(), but add the WHERE clauses only if a condition is met
+ * @param $value mixed See addWhere()
+ * @param $condition boolIf false, do nothing
+ * @return bool $condition
+ */
protected function addWhereIf($value, $condition) {
if ($condition) {
$this->addWhere($value);
return false;
}
+ /**
+ * Equivalent to addWhere(array($field => $value))
+ * @param $field string Field name
+ * @param $value string Value; ignored if null or empty array;
+ */
protected function addWhereFld($field, $value) {
- if (!is_null($value))
+ // Use count() to its full documented capabilities to simultaneously
+ // test for null, empty array or empty countable object
+ if ( count( $value ) )
$this->where[$field] = $value;
}
- protected function addWhereRange($field, $dir, $start, $end) {
+ /**
+ * Add a WHERE clause corresponding to a range, and an ORDER BY
+ * clause to sort in the right direction
+ * @param $field string Field name
+ * @param $dir string If 'newer', sort in ascending order, otherwise
+ * sort in descending order
+ * @param $start string Value to start the list at. If $dir == 'newer'
+ * this is the lower boundary, otherwise it's the upper boundary
+ * @param $end string Value to end the list at. If $dir == 'newer' this
+ * is the upper boundary, otherwise it's the lower boundary
+ * @param $sort bool If false, don't add an ORDER BY clause
+ */
+ protected function addWhereRange($field, $dir, $start, $end, $sort = true) {
$isDirNewer = ($dir === 'newer');
$after = ($isDirNewer ? '>=' : '<=');
$before = ($isDirNewer ? '<=' : '>=');
if (!is_null($end))
$this->addWhere($field . $before . $db->addQuotes($end));
- $this->addOption('ORDER BY', $field . ($isDirNewer ? '' : ' DESC'));
+ if ($sort) {
+ $order = $field . ($isDirNewer ? '' : ' DESC');
+ if (!isset($this->options['ORDER BY']))
+ $this->addOption('ORDER BY', $order);
+ else
+ $this->addOption('ORDER BY', $this->options['ORDER BY'] . ', ' . $order);
+ }
}
+ /**
+ * Add an option such as LIMIT or USE INDEX. If an option was set
+ * before, the old value will be overwritten
+ * @param $name string Option name
+ * @param $value string Option value
+ */
protected function addOption($name, $value = null) {
if (is_null($value))
$this->options[] = $name;
$this->options[$name] = $value;
}
+ /**
+ * Execute a SELECT query based on the values in the internal arrays
+ * @param $method string Function the query should be attributed to.
+ * You should usually use __METHOD__ here
+ * @return ResultWrapper
+ */
protected function select($method) {
// getDB has its own profileDBIn/Out calls
$db = $this->getDB();
$this->profileDBIn();
- $res = $db->select($this->tables, $this->fields, $this->where, $method, $this->options);
+ $res = $db->select($this->tables, $this->fields, $this->where, $method, $this->options, $this->join_conds);
$this->profileDBOut();
return $res;
}
+ /**
+ * Estimate the row count for the SELECT query that would be run if we
+ * called select() right now, and check if it's acceptable.
+ * @return bool true if acceptable, false otherwise
+ */
+ protected function checkRowCount() {
+ $db = $this->getDB();
+ $this->profileDBIn();
+ $rowcount = $db->estimateRowCount($this->tables, $this->fields, $this->where, __METHOD__, $this->options);
+ $this->profileDBOut();
+
+ global $wgAPIMaxDBRows;
+ if($rowcount > $wgAPIMaxDBRows)
+ return false;
+ return true;
+ }
+
+ /**
+ * Add information (title and namespace) about a Title object to a
+ * result array
+ * @param $arr array Result array à la ApiResult
+ * @param $title Title
+ * @param $prefix string Module prefix
+ */
public static function addTitleInfo(&$arr, $title, $prefix='') {
$arr[$prefix . 'ns'] = intval($title->getNamespace());
$arr[$prefix . 'title'] = $title->getPrefixedText();
}
-
+
/**
* Override this method to request extra fields from the pageSet
* using $pageSet->requestField('fieldName')
+ * @param $pageSet ApiPageSet
*/
public function requestExtraData($pageSet) {
}
/**
* Get the main Query module
+ * @return ApiQuery
*/
public function getQuery() {
return $this->mQueryModule;
}
/**
- * Add sub-element under the page element with the given pageId.
+ * Add a sub-element under the page element with the given page ID
+ * @param $pageId int Page ID
+ * @param $data array Data array à la ApiResult
+ * @return bool Whether the element fit in the result
*/
protected function addPageSubItems($pageId, $data) {
$result = $this->getResult();
$result->setIndexedTagName($data, $this->getModulePrefix());
- $result->addValue(array ('query', 'pages', intval($pageId)),
+ return $result->addValue(array('query', 'pages', intval($pageId)),
$this->getModuleName(),
$data);
}
+
+ /**
+ * Same as addPageSubItems(), but one element of $data at a time
+ * @param $pageId int Page ID
+ * @param $data array Data array à la ApiResult
+ * @param $elemname string XML element name. If null, getModuleName()
+ * is used
+ * @return bool Whether the element fit in the result
+ */
+ protected function addPageSubItem($pageId, $item, $elemname = null) {
+ if(is_null($elemname))
+ $elemname = $this->getModulePrefix();
+ $result = $this->getResult();
+ $fit = $result->addValue(array('query', 'pages', $pageId,
+ $this->getModuleName()), null, $item);
+ if(!$fit)
+ return false;
+ $result->setIndexedTagName_internal(array('query', 'pages', $pageId,
+ $this->getModuleName()), $elemname);
+ return true;
+ }
+ /**
+ * Set a query-continue value
+ * @param $paramName string Parameter name
+ * @param $paramValue string Parameter value
+ */
protected function setContinueEnumParameter($paramName, $paramValue) {
-
$paramName = $this->encodeParamName($paramName);
$msg = array( $paramName => $paramValue );
-
-// This is an alternative continue format as a part of the URL string
-// ApiResult :: setContent($msg, $paramName . '=' . urlencode($paramValue));
-
+ $this->getResult()->disableSizeCheck();
$this->getResult()->addValue('query-continue', $this->getModuleName(), $msg);
+ $this->getResult()->enableSizeCheck();
}
/**
- * Get the Query database connection (readonly)
+ * Get the Query database connection (read-only)
+ * @return Database
*/
protected function getDB() {
if (is_null($this->mDb))
/**
* Selects the query database connection with the given name.
- * If no such connection has been requested before, it will be created.
- * Subsequent calls with the same $name will return the same connection
- * as the first, regardless of $db or $groups new values.
+ * See ApiQuery::getNamedDB() for more information
+ * @param $name string Name to assign to the database connection
+ * @param $db int One of the DB_* constants
+ * @param $groups array Query groups
+ * @return Database
*/
public function selectNamedDB($name, $db, $groups) {
- $this->mDb = $this->getQuery()->getNamedDB($name, $db, $groups);
+ $this->mDb = $this->getQuery()->getNamedDB($name, $db, $groups);
}
/**
* Get the PageSet object to work on
- * @return ApiPageSet data
+ * @return ApiPageSet
*/
protected function getPageSet() {
return $this->getQuery()->getPageSet();
}
/**
- * This is a very simplistic utility function
- * to convert a non-namespaced title string to a db key.
- * It will replace all ' ' with '_'
+ * Convert a title to a DB key
+ * @param $title string Page title with spaces
+ * @return string Page title with underscores
*/
- public static function titleToKey($title) {
- return str_replace(' ', '_', $title);
+ public function titleToKey($title) {
+ # Don't throw an error if we got an empty string
+ if(trim($title) == '')
+ return '';
+ $t = Title::newFromText($title);
+ if(!$t)
+ $this->dieUsageMsg(array('invalidtitle', $title));
+ return $t->getPrefixedDbKey();
}
- public static function keyToTitle($key) {
- return str_replace('_', ' ', $key);
+ /**
+ * The inverse of titleToKey()
+ * @param $key string Page title with underscores
+ * @return string Page title with spaces
+ */
+ public function keyToTitle($key) {
+ # Don't throw an error if we got an empty string
+ if(trim($key) == '')
+ return '';
+ $t = Title::newFromDbKey($key);
+ # This really shouldn't happen but we gotta check anyway
+ if(!$t)
+ $this->dieUsageMsg(array('invalidtitle', $key));
+ return $t->getPrefixedText();
+ }
+
+ /**
+ * An alternative to titleToKey() that doesn't trim trailing spaces
+ * @param $titlePart string Title part with spaces
+ * @return string Title part with underscores
+ */
+ public function titlePartToKey($titlePart) {
+ return substr($this->titleToKey($titlePart . 'x'), 0, -1);
+ }
+
+ /**
+ * An alternative to keyToTitle() that doesn't trim trailing spaces
+ * @param $keyPart string Key part with spaces
+ * @return string Key part with underscores
+ */
+ public function keyPartToTitle($keyPart) {
+ return substr($this->keyToTitle($keyPart . 'x'), 0, -1);
}
+ /**
+ * Get version string for use in the API help output
+ * @return string
+ */
public static function getBaseVersion() {
return __CLASS__ . ': $Id$';
}
}
/**
- * @addtogroup API
+ * @ingroup API
*/
abstract class ApiQueryGeneratorBase extends ApiQueryBase {
$this->mIsGenerator = false;
}
+ /**
+ * Switch this module to generator mode. By default, generator mode is
+ * switched off and the module acts like a normal query module.
+ */
public function setGeneratorMode() {
$this->mIsGenerator = true;
}
/**
* Overrides base class to prepend 'g' to every generator parameter
+ * @param $paramNames string Parameter name
+ * @return string Prefixed parameter name
*/
public function encodeParamName($paramName) {
if ($this->mIsGenerator)
/**
* Execute this module as a generator
- * @param $resultPageSet PageSet: All output should be appended to this object
+ * @param $resultPageSet ApiPageSet: All output should be appended to
+ * this object
*/
public abstract function executeGenerator($resultPageSet);
}
-
dépôts / lhc / web / wiklou.git / blobdiff