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MDL-29496 unittests - verify COALESCE() cross-db compatibility

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Eloy Lafuente (stronk7) 2011-10-17 13:07:28 +02:00 committed by Jason Fowler
parent b438bce949
commit fc0aebb595
1 changed files with 42 additions and 0 deletions
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42
lib/dml/simpletest/testdml.php
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@ -3378,6 +3378,48 @@ class dml_test extends UnitTestCase {
$DB->get_records_sql($sql, $params);
}
function test_coalesce() {
$DB = $this->tdb;
// Testing not-null ocurrences, return 1st
$sql = "SELECT COALESCE('returnthis', 'orthis', 'orwhynotthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array()));
$sql = "SELECT COALESCE(:paramvalue, 'orthis', 'orwhynotthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array('paramvalue' => 'returnthis')));
// Testing null ocurrences, return 2nd
$sql = "SELECT COALESCE(null, 'returnthis', 'orthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array()));
$sql = "SELECT COALESCE(:paramvalue, 'returnthis', 'orthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array('paramvalue' => null)));
$sql = "SELECT COALESCE(null, :paramvalue, 'orthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array('paramvalue' => 'returnthis')));
// Testing null ocurrences, return 3rd
$sql = "SELECT COALESCE(null, null, 'returnthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array()));
$sql = "SELECT COALESCE(null, :paramvalue, 'returnthis') AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array('paramvalue' => null)));
$sql = "SELECT COALESCE(null, null, :paramvalue) AS test" . $DB->sql_null_from_clause();
$this->assertEqual('returnthis', $DB->get_field_sql($sql, array('paramvalue' => 'returnthis')));
// Testing all null ocurrences, return null
// Note: under mssql, if all elements are nulls, at least one must be a "typed" null, hence
// we cannot test this in a cross-db way easily, so next 2 tests are using
// different queries depending of the DB family
$customnull = $DB->get_dbfamily() == 'mssql' ? 'CAST(null AS varchar)' : 'null';
$sql = "SELECT COALESCE(null, null, " . $customnull . ") AS test" . $DB->sql_null_from_clause();
$this->assertNull($DB->get_field_sql($sql, array()));
$sql = "SELECT COALESCE(null, :paramvalue, " . $customnull . ") AS test" . $DB->sql_null_from_clause();
$this->assertNull($DB->get_field_sql($sql, array('paramvalue' => null)));
// Check there are not problems with whitespace strings
$sql = "SELECT COALESCE(null, '', null) AS test" . $DB->sql_null_from_clause();
$this->assertEqual('', $DB->get_field_sql($sql, array()));
$sql = "SELECT COALESCE(null, :paramvalue, null) AS test" . $DB->sql_null_from_clause();
$this->assertEqual('', $DB->get_field_sql($sql, array('paramvalue' => '')));
}
function test_sql_concat() {
$DB = $this->tdb;
$dbman = $DB->get_manager();