How to get the sum of 2 columns for each row in zend. My code is-
$fieldArray = array('Jan','Feb', 'total'=>'Jan+Feb');
$db = Zend_Db_Table::getDefaultAdapter();
$select = $db->select()
->from($this->_name,$fieldArray);
die($select);
But it prints the query-
SELECT Customer.Jan, Customer.Feb, Customer.Jan+Feb AS total FROM Customer
and it gives error.
How to write the statement to get the result?
you can try this :
$fieldArray = array('Jan','Feb', 'total'=>new Zend_Db_Expr('Jan+Feb'));
$db = Zend_Db_Table::getDefaultAdapter();
$select = $db->select()
->from($this->_name,$fieldArray);
die($select);
the query should be like
SELECT Customer.Jan, Customer.Feb, Customer.Jan+Customer.Feb AS total FROM Customer
Related
I am using count function to get the number of rows buffered in a resultset.
But it always returns count as one even if resultset is empty.
Please see the code below:
$dbhandle = new SQLite3("sqlitedb_111.db");
$selQuery1 = "SELECT id,dbname,tabname,fieldname FROM scan_results ORDER BY id ASC LIMIT 0,10";
$resQuery1 = $dbhandle->query($selQuery1);
print count($resQuery1);
What am I doing wrong and how can I fix this?
As per your comment if you just want to return the count of records you could wrap your query in a SELECT COUNT(*) and change $dbhandle->query to $dbhandle->querySingle. This will work with or without LIMIT.
$dbhandle = new SQLite3("sqlitedb_111.db");
$selQuery1 = "SELECT COUNT(*) FROM (SELECT id,dbname,tabname,fieldname FROM scan_results ORDER BY id ASC LIMIT 0,10)";
$resQuery1 = $dbhandle->querySingle($selQuery1);
print count($resQuery1);
Result is an array. find the size of the array.
$dbhandle = new SQLite3("sqlitedb_111.db");
$selQuery1 = "SELECT id,dbname,tabname,fieldname FROM scan_results ORDER BY id ASC LIMIT 0,10";
$resQuery1 = $dbhandle->query($selQuery1);
$noofrows=sizeof($resQuery1);
echo $noofrows;
SQLite is an embedded database, i.e., there is no client/server communication overhead.
Therefore, it can return the results dynamically; there is only a single row buffered at any time.
To get the number of result rows, you either have to step through the results, or execute something like SELECT COUNT(*) FROM (original query).
Call numRows() on the result set.
From http://php.net/manual/en/function.sqlite-num-rows.php
<?php
$db = new SQLiteDatabase('mysqlitedb');
$result = $db->query("SELECT * FROM mytable WHERE name='John Doe'");
$rows = $result->numRows();
echo "Number of rows: $rows";
?>
I am trying to get single rank for a user for each stat "column" in the table. I am trying to do this as more efficiently because i know you can.
So I have a table called userstats. in that table i have 3 columns user_id, stat_1, stat_2, and stat_3. I want to me able to get the rank for each stat for the associated user_id. with my current code below i would have to duplicate the code 3x and change the column names to get my result. please look at the examples below. Thanks!
this is how i currently get the rank for the users
$rankstat1 = getUserRank($userid);
<code>
function getUserRank($userid){
$sql = "SELECT * FROM ".DB_USERSTATS." ORDER BY stat_1 DESC";
$result = mysql_query($sql);
$rows = '';
$data = array();
if (!empty($result))
$rows = mysql_num_rows($result);
else
$rows = '';
if (!empty($rows)){
while ($rows = mysql_fetch_assoc($result)){
$data[] = $rows;
}
}
$rank = 1;
foreach($data as $item){
if ($item['user_id'] == $userid){
return $rank;
}
++$rank;
}
return 1;
}
</code>
I believe there is a way for me to get what i need with something like this but i cant get it to work.
$rankstat1 = getUserRank($userid, 'stat_1'); $rankstat2 =
getUserRank($userid, 'stat_2'); $rankstat3 = getUserRank($userid,
'stat_3');
You can get all the stat ranks using one query without doing all the PHP looping and checking.
I have used PDO in this example because the value of the $userid variable needs to be used in the query, and the deprecated mysql database extension does not support prepared statements, which should be used to reduce the risk of SQL injection.
The function could be adapted to use the same query with mysqli, or even mysql if you must use it.
function getUserRanks($userid, $pdo) {
$sql = "SELECT
COUNT(DISTINCT s1.user_id) + 1 AS stat_1_rank,
COUNT(DISTINCT s2.user_id) + 1 AS stat_2_rank,
COUNT(DISTINCT s3.user_id) + 1 AS stat_3_rank
FROM user_stats f
LEFT JOIN user_stats s1 ON f.stat_1 < s1.stat_1
LEFT JOIN user_stats s2 ON f.stat_2 < s2.stat_2
LEFT JOIN user_stats s3 ON f.stat_3 < s3.stat_3
WHERE f.user_id = ?"
$stmt = $pdo->prepare($sql);
$stmt->bindValue(1, $userid);
$stmt->execute();
$ranks = $stmt->fetchObject();
return $ranks;
}
This should return an object with properties containing the ranks of the given user for each stat. An example of using this function:
$pdo = new PDO($dsn, $user, $pw);
$ranks = getUserRanks(3, $pdo); // get the stat ranks for user 3
echo $ranks->stat_2_rank; // show user 3's rank for stat 2
$sql = "SELECT user_id, stat_1, stat_2, stat_3 FROM ".DB_USERSTATS." ORDER BY stat_1 DESC";
Also, unless there is a reason you need ALL users results, limit your query with a WHERE clause so you're only getting the results you actually need.
Assuming you limit your sql query to just one user, this will get that user's stats.
foreach($data as $item){
$stat_1 = $item['stat_1'];
$stat_2 = $item['stat_2'];
$stat_3 = $item['stat_3'];
}
If you get more than one user's stats with your sql query, consider passing your $data array back to the calling function and loop through the array to match the users stats to particular user id's.
I am using count function to get the number of rows buffered in a resultset.
But it always returns count as one even if resultset is empty.
Please see the code below:
$dbhandle = new SQLite3("sqlitedb_111.db");
$selQuery1 = "SELECT id,dbname,tabname,fieldname FROM scan_results ORDER BY id ASC LIMIT 0,10";
$resQuery1 = $dbhandle->query($selQuery1);
print count($resQuery1);
What am I doing wrong and how can I fix this?
As per your comment if you just want to return the count of records you could wrap your query in a SELECT COUNT(*) and change $dbhandle->query to $dbhandle->querySingle. This will work with or without LIMIT.
$dbhandle = new SQLite3("sqlitedb_111.db");
$selQuery1 = "SELECT COUNT(*) FROM (SELECT id,dbname,tabname,fieldname FROM scan_results ORDER BY id ASC LIMIT 0,10)";
$resQuery1 = $dbhandle->querySingle($selQuery1);
print count($resQuery1);
Result is an array. find the size of the array.
$dbhandle = new SQLite3("sqlitedb_111.db");
$selQuery1 = "SELECT id,dbname,tabname,fieldname FROM scan_results ORDER BY id ASC LIMIT 0,10";
$resQuery1 = $dbhandle->query($selQuery1);
$noofrows=sizeof($resQuery1);
echo $noofrows;
SQLite is an embedded database, i.e., there is no client/server communication overhead.
Therefore, it can return the results dynamically; there is only a single row buffered at any time.
To get the number of result rows, you either have to step through the results, or execute something like SELECT COUNT(*) FROM (original query).
Call numRows() on the result set.
From http://php.net/manual/en/function.sqlite-num-rows.php
<?php
$db = new SQLiteDatabase('mysqlitedb');
$result = $db->query("SELECT * FROM mytable WHERE name='John Doe'");
$rows = $result->numRows();
echo "Number of rows: $rows";
?>
I have a query to count all rows in Db table.
$results = $db->fetchAll('select count(id) as total_keys, sum(if(used,1,0)) as used_keys from product_keys');
$this->_helper->flashMessenger->addMessage($results);
I want to get the total_keys and used_keys, but it doesn't seen to work.
$results = $db->fetchOne('select count(id) as total_keys, sum(if(used,1,0)) as used_keys from product_keys');
$this->_helper->flashMessenger->addMessage($results);
I'm pretty sure this is not possible in Zend Framework (I have searched the Web, the documentation and issue tracker) but I just want to make sure so I'm asking here.
$select = $this->select();
$select->union($select1, $select2);
That doesn't work of course. To explain what I need. I need to use UNION() to merge 2 tables in a SELECT query, I know I could just do:
$select = "$select1 UNION $select2";
The problem is that would return a string and I need to get a select object so I can use it with Zend_Paginator.
I have already solved the issue by modifying my database architecture but I'm just curious if there is some workaround for this.
Here's what I've done to make a union:
$select = $this->select();
//common select from both sides of the union goes here
$select1 = clone($select);
//select1 specifics here
$select2 = clone($select);
//select 2 specifics here
$db = $this->getAdapter();
$pageselect = $db->select()->union(array("($select1)", "($select2)"));
Remember Db_Select's __toString will print out the SQL generated by that select, to help you debug.
Zend_Db_Select has a union method so I'd have thought it is possible, if you can build your query using a select object. I haven't used Zend_Db_Select (or the table subclass) with union but I'd imagine you can do something like
$select = $this->select()
->where('blah')
->union($sql);
a complete example:
public function getReservationById($id)
{
if(!$id) return null;
$sql = $this->table->select();
$sql->union(array(
$this->table->select()->where('id=?', $id),
$this->tableFinished->select()->where('id=?', $id),
$this->tableCanceled->select()->where('id=?', $id),
$this->tableTrashed->select()->where('id=?', $id)
));
echo $sql->__toString();
}
and the generated query:
SELECT reservations.* FROM reservations WHERE (id='5658') UNION SELECT res_finished.* FROM res_finished WHERE (id='5658') UNION SELECT res_cancel.* FROM res_cancel WHERE (id='5658') UNION SELECT res_trash.* FROM res_trash WHERE (id='5658')
This practical example shows a function that returns a rowset of either latest or if a available favourite blog entries of a specific year (artwork blog):
public function fetchBestOf($year)
{
$selectLatest = $this->select()->where('isHidden = 0')
->where('YEAR(dateCreated) = ' . $year)
->where('isHighlight = 0');
$selectHighlights = $this->select()->where('isHidden = 0')
->where('YEAR(dateCreated) = ' . $year)
->where('isHighlight = 1');
$selectUnion = $this->select()->union(array($selectLatest, $selectHighlights), Zend_Db_Select::SQL_UNION_ALL)
->order('isHighlight DESC')
->order('dateCreated DESC')
->order('workID DESC')
->limit('5');
$rowset = $this->fetchAll($selectUnion);
return $rowset;
}
The best way Zend suggest is like follows....
$sql = $this->_db->select()
->union(array($select1, $select2,$select3))
->order('by_someorder');
echo $sql->__toString();
$stmt = $db->query($sql);
$result = $stmt->fetchAll();
echo will show the query
Here $select1, $select2, $select3 can be different select queries with same
number of columns...
This is how it works for me:
$select1 = $this->select();
$select2 = $this->select();
After getting the necessary data in both queries the UNION syntax goes like this:
$select = $this->select()->union(array('('.$select1.')', '('.$select2.')'));