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Merge branch 'm38_MDL-65811_Fix_Incorrect_ORDER_BY_Search' of https://github.com/scara/moodle

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This commit is contained in:
Jun Pataleta 2019-10-28 11:37:27 +08:00
commit 46f1284768
2 changed files with 144 additions and 2 deletions

28
lib/dml/sqlsrv_native_moodle_database.php

@ -841,6 +841,30 @@ class sqlsrv_native_moodle_database extends moodle_database {
return true;
}
/**
* Whether the given SQL statement has the ORDER BY clause in the main query.
*
* @param string $sql the SQL statement
* @return bool true if the main query has the ORDER BY clause; otherwise, false.
*/
protected static function has_query_order_by(string $sql) {
$sqltoupper = strtoupper($sql);
// Fail fast if there is no ORDER BY clause in the original query.
if (strpos($sqltoupper, 'ORDER BY') === false) {
return false;
}
// Search for an ORDER BY clause in the main query, not in any subquery (not always allowed in MSSQL)
// or in clauses like OVER with a window function e.g. ROW_NUMBER() OVER (ORDER BY ...) or RANK() OVER (ORDER BY ...):
// use PHP PCRE recursive patterns to remove everything found within round brackets.
$mainquery = preg_replace('/\(((?>[^()]+)|(?R))*\)/', '()', $sqltoupper);
if (strpos($mainquery, 'ORDER BY') !== false) {
return true;
}
return false;
}
/**
* Get a number of records as a moodle_recordset using a SQL statement.
*
@ -876,9 +900,9 @@ class sqlsrv_native_moodle_database extends moodle_database {
} else {
$needscrollable = false; // Using supported fetch/offset, no need to scroll anymore.
$sql = (substr($sql, -1) === ';') ? substr($sql, 0, -1) : $sql;
// We need order by to use FETCH/OFFSET.
// We need ORDER BY to use FETCH/OFFSET.
// Ordering by first column shouldn't break anything if there was no order in the first place.
if (!strpos(strtoupper($sql), "ORDER BY")) {
if (!self::has_query_order_by($sql)) {
$sql .= " ORDER BY 1";
}

118
lib/dml/tests/sqlsrv_native_moodle_database_test.php

@ -134,6 +134,124 @@ class sqlsrv_native_moodle_database_testcase extends advanced_testcase {
$temptablesproperty->setValue($sqlsrv, null);
$this->assertEquals($expected, $result);
}
/**
* Data provider for test_has_query_order_by
*
* @return array data for test_has_query_order_by
*/
public function has_query_order_by_provider() {
// Fixtures taken from https://docs.moodle.org/en/ad-hoc_contributed_reports.
return [
'User with language => FALSE' => [
'sql' => <<<EOT
SELECT username, lang
FROM prefix_user
EOT
,
'expectedmainquery' => <<<EOT
SELECT username, lang
FROM prefix_user
EOT
,
'expectedresult' => false
],
'List Users with extra info (email) in current course => FALSE' => [
'sql' => <<<EOT
SELECT u.firstname, u.lastname, u.email
FROM prefix_role_assignments AS ra
JOIN prefix_context AS context ON context.id = ra.contextid AND context.contextlevel = 50
JOIN prefix_course AS c ON c.id = context.instanceid AND c.id = %%COURSEID%%
JOIN prefix_user AS u ON u.id = ra.userid
EOT
,
'expectedmainquery' => <<<EOT
SELECT u.firstname, u.lastname, u.email
FROM prefix_role_assignments AS ra
JOIN prefix_context AS context ON context.id = ra.contextid AND context.contextlevel = 50
JOIN prefix_course AS c ON c.id = context.instanceid AND c.id = %%COURSEID%%
JOIN prefix_user AS u ON u.id = ra.userid
EOT
,
'expectedresult' => false
],
'ROW_NUMBER() OVER (ORDER BY ...) => FALSE (https://github.com/jleyva/moodle-block_configurablereports/issues/120)' => [
'sql' => <<<EOT
SELECT COUNT(*) AS 'Users who have logged in today'
FROM (
SELECT ROW_NUMBER() OVER(ORDER BY lastaccess DESC) AS Row
FROM mdl_user
WHERE lastaccess > DATEDIFF(s, '1970-01-01 02:00:00', (SELECT Convert(DateTime, DATEDIFF(DAY, 0, GETDATE()))))
) AS Logins
EOT
,
'expectedmainquery' => <<<EOT
SELECT COUNT() AS 'Users who have logged in today'
FROM () AS Logins
EOT
,
'expectedresult' => false
],
'CONTRIB-7725 workaround) => TRUE' => [
'sql' => <<<EOT
SELECT COUNT(*) AS 'Users who have logged in today'
FROM (
SELECT ROW_NUMBER() OVER(ORDER BY lastaccess DESC) AS Row
FROM mdl_user
WHERE lastaccess > DATEDIFF(s, '1970-01-01 02:00:00', (SELECT Convert(DateTime, DATEDIFF(DAY, 0, GETDATE()))))
) AS Logins ORDER BY 1
EOT
,
'expectedmainquery' => <<<EOT
SELECT COUNT() AS 'Users who have logged in today'
FROM () AS Logins ORDER BY 1
EOT
,
'expectedresult' => true
],
'Enrolment count in each Course => TRUE' => [
'sql' => <<<EOT
SELECT c.fullname, COUNT(ue.id) AS Enroled
FROM prefix_course AS c
JOIN prefix_enrol AS en ON en.courseid = c.id
JOIN prefix_user_enrolments AS ue ON ue.enrolid = en.id
GROUP BY c.id
ORDER BY c.fullname
EOT
,
'expectedmainquery' => <<<EOT
SELECT c.fullname, COUNT() AS Enroled
FROM prefix_course AS c
JOIN prefix_enrol AS en ON en.courseid = c.id
JOIN prefix_user_enrolments AS ue ON ue.enrolid = en.id
GROUP BY c.id
ORDER BY c.fullname
EOT
,
'expectedresult' => true
],
];
}
/**
* Test has_query_order_by
*
* @dataProvider has_query_order_by_provider
* @param string $sql the query
* @param string $expectedmainquery the expected main query
* @param bool $expectedresult the expected result
*/
public function test_has_query_order_by(string $sql, string $expectedmainquery, bool $expectedresult) {
$mainquery = preg_replace('/\(((?>[^()]+)|(?R))*\)/', '()', $sql);
$this->assertSame($expectedmainquery, $mainquery);
// The has_query_order_by static method is protected. Use Reflection to call the method.
$method = new ReflectionMethod('sqlsrv_native_moodle_database', 'has_query_order_by');
$method->setAccessible(true);
$result = $method->invoke(null, $sql);
$this->assertSame($expectedresult, $result);
}
}
/**