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DQL - SQL conversion LIMIT clause parsing examples added

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This commit is contained in:
zYne 2006-08-21 10:43:44 +00:00
parent 45bca0358a
commit 8755e5ab50
4 changed files with 42 additions and 5 deletions
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1
Doctrine/Form.php
View File

@ -50,6 +50,7 @@ class Doctrine_Form implements Iterator {
} else {
$elements[$column] = "<textarea name='data[$column]' cols=80 rows=25>".$this->record->get($column)."</textarea>\n";
}
}
return $elements[$column];
} else {

42
manual/docs/Basic Components - Query - DQL - SQL conversion.php
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@ -24,7 +24,7 @@ DQL QUERY: FROM User(id) WHERE User.Group.Phonenumber.phonenumber LIKE '123 123'
SQL QUERY: SELECT entity.id AS entity__id FROM entity LEFT JOIN groupuser ON entity.id = groupuser.user_id LEFT JOIN entity AS entity2 ON entity2.id = groupuser.group_id LEFT JOIN phonenumber ON entity2.id = phonenumber.entity_id WHERE phonenumber.phonenumber LIKE '123 123' AND (entity.type = 0 AND (entity2.type = 1 OR entity2.type IS NULL))
";
function renderQueries($str) {
$e = explode("\n",$str);
$color = "367FAC";
@ -37,16 +37,50 @@ foreach($e as $line) {
$l = str_replace("SELECT","<br \><font color='$color'><b>SELECT</b></font>",$line);
$l = str_replace("FROM","<br \><font color='$color'><b>FROM</b></font>",$l);
$l = str_replace("LEFT JOIN","<br \><font color='$color'><b>LEFT JOIN</b></font>",$l);
$l = str_replace("INNER JOIN","<br \><font color='$color'><b>INNER JOIN</b></font>",$l);
$l = str_replace("WHERE","<br \><font color='$color'><b>WHERE</b></font>",$l);
$l = str_replace("AS","<font color='$color'><b>AS</b></font>",$l);
$l = str_replace("ON","<font color='$color'><b>ON</b></font>",$l);
$l = str_replace("ORDER BY","<font color='$color'><b>ORDER BY</b></font>",$l);
$l = str_replace("LIMIT","<font color='$color'><b>LIMIT</b></font>",$l);
$l = str_replace("OFFSET","<font color='$color'><b>OFFSET</b></font>",$l);
$l = str_replace("DISTINCT","<font color='$color'><b>DISTINCT</b></font>",$l);
$l = str_replace(" ","<dd>",$l);
if(substr($l,0,3) == "DQL") print "<hr valign='left' class='small'>";
print $l."<br>";
if(substr($l,0,3) == "SQL") print "<hr valign='left' class='small'>";
}
}
renderQueries($str);
?>
Propably the most complex feature DQL parser has to offer is its LIMIT clause parser. In pure
sql the limit clause limits the number of rows returned. So for example when fetching users and their
phonenumbers using limit 20 you might get anything between 1-20 users, since the first user might have 20 phonenumbers and
hence the record set would consist of 20 rows.
<br \><br \>
DQL overcomes this problem with subqueries and with complex but efficient subquery analysis. In the next example
we are going to fetch first 20 users and all their phonenumbers with single efficient query. Notice how the DQL parser is smart enough
to use column aggregation inheritance even in the subquery.
<br \><br \>
<?php
$str = "
DQL QUERY: FROM User.Phonenumber LIMIT 20
SQL QUERY: SELECT entity.id AS entity__id, phonenumber.id AS phonenumber__id, phonenumber.phonenumber AS phonenumber__phonenumber, phonenumber.entity_id AS phonenumber__entity_id FROM entity LEFT JOIN phonenumber ON entity.id = phonenumber.entity_id WHERE entity.id IN (SELECT DISTINCT entity.id FROM entity WHERE (entity.type = 0) LIMIT 20) AND (entity.type = 0)
";
renderQueries($str);
?>
In the next example
we are going to fetch first 20 users and all their phonenumbers and only those users that actually have phonenumbers (hence the usage of colon operator = INNER JOIN) with single efficient query.
Notice how the DQL parser is smart enough to use the INNER JOIN in the subquery.
<br \>
<?php
$str = "
DQL QUERY: FROM User:Phonenumber LIMIT 20
SQL QUERY: SELECT entity.id AS entity__id, phonenumber.id AS phonenumber__id, phonenumber.phonenumber AS phonenumber__phonenumber, phonenumber.entity_id AS phonenumber__entity_id FROM entity INNER JOIN phonenumber ON entity.id = phonenumber.entity_id WHERE entity.id IN (SELECT DISTINCT entity.id FROM entity INNER JOIN phonenumber ON entity.id = phonenumber.entity_id WHERE (entity.type = 0) LIMIT 20) AND (entity.type = 0)
";
renderQueries($str);
?>

3
manual/documentation.php
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@ -166,12 +166,13 @@ $menu = array("Getting started" =>
"Using SQL",
"Adding components",
"Method overloading"),
/**
"Statement - <font color='red'>UNDER CONSTRUCTION</font>" => array("Introduction",
"Setting parameters",
"Getting parameters",
"Getting row count",
"Executing the statement"),
*/
"Exceptions" => array(
"Overview",
"List of exceptions"

1
tests/QueryLimitTestCase.php
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@ -76,6 +76,7 @@ class Doctrine_Query_Limit_TestCase extends Doctrine_UnitTestCase {
$this->query->from("User(id):Phonenumber");
$this->query->limit(5);
$sql = $this->query->getQuery();
$users = $this->query->execute();