select rg.guardian_name,
rg.guardian_id,
rg.guardian_email
from rts_guardian rd, rts_ward rw, rts_wrdgrd_junction junct
where rg.guardian_id = junct.guardian_id and rw.ward_id=junct.ward_id and rw.garde='VIII';
You can begin by this simple example :
Query query = session.createQuery
("select stock_code, stock_name from backup_stock where id_stock= :id");
Here is how you can set parameters :
query.setParameter("id", "1");
And to get the result:
List list = query.list();
please search more before asking here. You can find many documentation on this subject so make an effort.
Related
I've created a quiz and I record in DB if people answered right to all question and the time they take to finish the quiz.
I'm trying to create a querybuilder to retrieve the guy who answered correct to the maximum of questions with the minimum of time.
My table looks like this :
So, the request (which works) I did in SQL in the DB is :
SELECT
id
FROM
public.user_quizz
WHERE
quizz_id = 4
AND
number_correct_answers IN (SELECT max(number_correct_answers) FROM user_quizz WHERE quizz_id = 4)
AND
answered_in IN (SELECT min(answered_in) FROM user_quizz WHERE quizz_id = 4);
Of course, I don't know if it's the best (and the most optimal) request we could do in this case, but it works.
Now, I'm trying to translate this query into querybuilder.
I'm blocked on the IN expression. I don't know how I could do the SELECT here.
$qb = $this->createQueryBuilder('u');
$query = $qb->select('u')
->andWhere(
$qb->expr()->eq('u.quizz', ':quizzId'),
$qb->expr()->in(
'u.numberCorrectAnswers',
)
)
->setParameter('quizzId', $quizz->getId())
->getQuery()
;
Thanks for your help.
$qbSelectMax = $this->createQueryBuilder('uc') // user copy, to prevent alias collisions
$qbSelectMax
->select($qb->expr()->max('uc.numberCorrectAnswers'))
->where($qb->expr()->eq('uc.quizz', ':quizzId'));
$qb = $this->createQueryBuilder('u')
$query = $qb->select('u')
->andWhere(
$qb->expr()->eq('u.quizz', ':quizzId'),
$qb->expr()->in(
'u.numberCorrectAnswers',
$qbSelectMax->getDQL()
)
)
->setParameter('quizzId', $quizz->getId())
->getQuery();
You can create sub DQL query to select max numberCorrectAnswers first and then pass DQL right into in parameter
ORDER BY could be used to sort by number of answers and less time taken:
$qb = $this->createQueryBuilder('u')
->orderBy('u.numberCorrectAnswers', 'DESC')
->addOrderBy('u.answeredIn', 'ASC');
Hello i try generate a query in Zend 2 just like this
select top 10 * from mensaje where idUsuario = 11 order by fechaAltaMensaje DESC
i try use this
$select = $sql->select();
$select->from('mensaje');
$select->where('idUsuario = '.$idUser.' order by fechaAltaMensaje DESC');
$select->limit(5);
but don't work
You are missing some details in your code in order for it to work,
please see below.
$adapter = $this->tableGateway->getAdapter();//use Zend\Db\TableGateway\TableGateway;
$sql = new Sql($adapter);//use Zend\Db\Sql\Sql;
$select = $sql->select();
$select->from('mensaje');
$select->where('idUsuario = '.$idUser.'');
$select->order('fechaAltaMensaje DESC');
$select->limit(5);
$selectString = $sql->getSqlStringForSqlObject($select);//print_r($selectString);die; //gives you the query in string
$results = $adapter->query($selectString, $adapter::QUERY_MODE_EXECUTE);
$resultSet = new ResultSet();//use Zend\Db\ResultSet\ResultSet;
$resultSet->initialize($results);
return $resultSet->toArray();//the result to array
Please read the tutorials below and you will get the full picture
Examples
Examples 2
The limit function only applies to platforms that support it. To achieve what you're after in SQL you need to use the quantifier function.
Also - where accepts an array of column => value pairs.
And there is an order function that accepts a column name and direction:
$select = $sql->select();
$select->from('mensaje')
->where(['idUsuario' => $idUser])
->order('fechaAltaMensaje DESC')
->quantifier('TOP(5)')
I am not pleased with Zends implementation of the sql abstraction layer, when you need to use two different functions to write SQL that is not cross platform to do simple things like limit or top. That's just my two pence.
Using Hibernate's Criteria, I want to execute the equivalent of:
select distinct uspscity, state from citycomplete where USPSCITY = 'HOUSTON'
I thought doing the following would yield the results I wanted:
ProjectionList projList = new ProjectionList();
projList.add(Projections.distinct(Projections.property("id.state")));
projList.add(Projections.distinct(Projections.property("id.uspsCity")));
criteria.setProjection(projList);
But, what this actually does is execute something like:
select distinct uspscity, distinct state from citycomplete where USPSCITY = 'HOUSTON'
Which throws an error, obviously.
Other than not using Criteria, is there a solution for this?
Thanks,
Brandon
ProjectionList projList = Projections.projectionList();
projList.add(Projections.property("id.state"));
projList.add(Projections.property("id.uspsCity"));
criteria.setProjection(Projections.distinct(projList));
I'm currently struggling on how to execute my query on a Table object in Zend and get a Rowset in return. Reason I need particularly THIS is because I'm modifying a code for existing project and I don't have much flexibility.
Query:
SELECT *
FROM `tblname` ud
WHERE ud.user_id = some_id
AND
(
(ud.reputation_level > 1)
OR
(
(SELECT COUNT( * )
FROM `tblname` t
WHERE t.user_id = ud.user_id
AND t.category_id <=> ud.category_id
AND t.city_id <=> ud.city_id
) = 1
)
)
Is there a way to describe this query using Select object?
Previous SQL solution was very simple and consisted of one WHERE clause:
$where = $this->getAdapter()->quoteInto("user_id = ?",$user_id);
return $this->fetchAll($where);
I need to produce same type of the result (so that it could be processed by existing code) but for more complicated query.
Things I've tried
$db = Zend_Db_Table::getDefaultAdapter();
return $db->query($sql)->fetchAll();
---------------- OR ----------------------
return $this->fetchAll($select);
---------------- OR ----------------------
return $this->_db->query($sql)->fetchAll();
But they either produce arrays instead of objects or fail with Cardinality violation message.
I would appreciate any help on how to handle SQL text queries in Zend.
$dbAdapter = Zend_Db_Table::getDefaultAdapter();
//change the fetch mode becouse you don't like the array
$dbAdapter->setFetchMode(Zend_Db::FETCH_OBJ);
$sql = "you're long sql here";
$result = $dbAdapter->fetchAll($sql);
Zend_Debug::dump($result);
exit;
For a list of all fetch modes go to Zend_Db_Adapter
To write you're query using Zend_Db_Select instead of manual string , look at Zend_Db_Slect
I use codeigniter and have an issue about SELECT MAX ... I couldnot find any solution at google search...
it looks like it returns only id :/ it's giving error for other columns of table :/
Appreciate helps, thanks!
Model:
function get_default()
{
$this->db->select_max('id');
$query = $this->db->getwhere('gallery', array('cat' => "1"));
if($query->num_rows() > 0) {
return $query->row_array(); //return the row as an associative array
}
}
Controller:
$default_img = $this->blabla_model->get_default();
$data['default_id'] = $default_img['id']; // it returns this
$data['default_name'] = $default_img['gname']; // it gives error for gname although it is at table
To achieve your goal, your desire SQL can look something like:
SELECT *
FROM gallery
WHERE cat = '1'
ORDER BY id
LIMIT 1
And to utilise CodeIgniter database class:
$this->db->select('*');
$this->db->where('cat', '1');
$this->db->order_by('id', 'DESC');
$this->db->limit(1);
$query = $this->db->get('gallery');
That is correct: select_max returns only the value, and no other column. From the specs:
$this->db->select_max('age');
$query = $this->db->get('members');
// Produces: SELECT MAX(age) as age FROM members
You may want to read the value first, and run another query.
For an id, you can also use $id = $this->db->insert_id();
See also: http://www.hostfree.com/user_guide/database/active_record.html#select
CodeIgniter will select * if nothing else is selected. By setting select_max() you are populating the select property and therefore saying you ONLY want that value.
To solve this, just combine select_max() and select():
$this->db->select('somefield, another_field');
$this->db->select_max('age');
or even:
$this->db->select('sometable.*', FALSE);
$this->db->select_max('age');
Should do the trick.
It should be noted that you may of course also utilize your own "custom" sql statements in CodeIgniter, you're not limited to the active record sql functions you've outlined thus far. Another active record function that CodeIgniter provides is $this->db->query(); Which allows you to submit your own SQL queries (including variables) like so:
function foo_bar()
{
$cat = 1;
$limit = 1;
$sql = "
SELECT *
FROM gallery
WHERE cat = $cat
ORDER BY id
LIMIT $limit
";
$data['query'] = $this->db->query($sql);
return $data['query'];
}
Recently I have been utilizing this quite a bit as I've been doing some queries that are difficult (if not annoying or impossible) to pull off with CI's explicit active record functions.
I realize you may know this already, just thought it would help to include for posterity.
2 helpful links are:
http://codeigniter.com/user_guide/database/results.html
http://codeigniter.com/user_guide/database/examples.html