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new DQL docs

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zYne 2006-10-10 20:52:10 +00:00
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26
manual/docs/DQL (Doctrine Query Language) - Conditional expressions - Exists Expressions.php Normal file
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Syntax:
<div class='sql'>
<pre>
<i>operand</i> [NOT ]EXISTS (<i>subquery</i>)
</pre>
</div>
The EXISTS operator returns TRUE if the subquery returns one or more rows and FALSE otherwise. <br \>
<br \>
The NOT EXISTS operator returns TRUE if the subquery returns 0 rows and FALSE otherwise.<br \>
<br \>
Finding all articles which have readers:
<div class='sql'>
<pre>
FROM Article
WHERE EXISTS (FROM ReaderLog(id)
WHERE ReaderLog.article_id = Article.id)
</pre>
</div>
Finding all articles which don't have readers:
<div class='sql'>
<pre>
FROM Article
WHERE NOT EXISTS (FROM ReaderLog(id)
WHERE ReaderLog.article_id = Article.id)
</pre>
</div>

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manual/docs/DQL (Doctrine Query Language) - Conditional expressions - In expressions.php
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Syntax: Syntax:
<div class='sql'> <div class='sql'>
<pre> <pre>
<i>operand</i> IN (<i>subquery</i>|<i>valuelist</i>) <i>operand</i> IN (<i>subquery</i>|<i>value list</i>)
</pre> </pre>
</div> </div>
An IN conditional expression returns true if the <i>operand</i> is found from result of the <i>subquery</i> An IN conditional expression returns true if the <i>operand</i> is found from result of the <i>subquery</i>
or if its in the specificied comma separated <i>valuelist</i>, hence the IN expression is always false if the result of the subquery or if its in the specificied comma separated <i>value list</i>, hence the IN expression is always false if the result of the subquery
is empty. is empty.
When <i>value list</i> is being used there must be at least one element in that list.
<div class='sql'> <div class='sql'>
<pre> <pre>
FROM C1 WHERE C1.col1 IN (FROM C2(col1)); FROM C1 WHERE C1.col1 IN (FROM C2(col1));

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manual/docs/DQL (Doctrine Query Language) - Conditional expressions - Literals.php Normal file
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<b>Strings</b><br \>
A string literal is enclosed in single quotes—for example: 'literal'. A string literal that includes a single
quote is represented by two single quotes—for example: 'literal''s'.
<div class='sql'>
<pre>
FROM User WHERE User.name = 'Vincent'
</pre>
</div>
<b>Integers</b><br \>
Integer literals support the use of PHP integer literal syntax.
<div class='sql'>
<pre>
FROM User WHERE User.id = 4
</pre>
</div>
<b>Floats</b><br \>
Float literals support the use of PHP float literal syntax.
<div class='sql'>
<pre>
FROM Account WHERE Account.amount = 432.123
</pre>
</div>
<br \>
<b>Booleans</b><br \>
The boolean literals are true and false.
<div class='sql'>
<pre>
FROM User WHERE User.admin = true
FROM Session WHERE Session.is_authed = false
</pre>
</div>
<br \>
<b>Enums</b><br \>
The enumerated values work in the same way as string literals.
<div class='sql'>
<pre>
FROM User WHERE User.type = 'admin'
</pre>
</div>
<br \>
Predefined reserved literals are case insensitive, although its a good standard to write them in uppercase.

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manual/docs/DQL (Doctrine Query Language) - Conditional expressions - Subqueries.php Normal file
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A subquery can contain any of the keywords or clauses that an ordinary SELECT query can contain.
<br \><br \>
Some advantages of the subqueries:
<ul>
<li \>They allow queries that are structured so that it is possible to isolate each part of a statement.
<li \>They provide alternative ways to perform operations that would otherwise require complex joins and unions.
<li \>They are, in many people's opinion, readable. Indeed, it was the innovation of subqueries that gave people the original idea of calling the early SQL “Structured Query Language.”
</ul>