1
0
mirror of synced 2024-12-15 07:36:03 +03:00
doctrine2/manual/docs/DQL (Doctrine Query Language) - Operators - Logical operators.php
2007-04-13 21:49:11 +00:00

168 lines
2.7 KiB
PHP

<li>
NOT, !
Logical NOT. Evaluates to 1 if the
operand is 0, to 0 if
the operand is non-zero, and NOT NULL
returns NULL.
<b class='title'>DQL condition :** NOT 10
-&gt; 0
<b class='title'>DQL condition :** NOT 0
-&gt; 1
<b class='title'>DQL condition :** NOT NULL
-&gt; NULL
<b class='title'>DQL condition :** ! (1+1)
-&gt; 0
<b class='title'>DQL condition :** ! 1+1
-&gt; 1
</pre>
The last example produces 1 because the
expression evaluates the same way as
(!1)+1.
</li>
<li>
<a name="function_and"></a>
<a class="indexterm" name="id2965271"></a>
<a class="indexterm" name="id2965283"></a>
AND
Logical AND. Evaluates to 1 if all
operands are non-zero and not NULL, to
0 if one or more operands are
0, otherwise NULL is
returned.
<b class='title'>DQL condition :** 1 AND 1
-&gt; 1
<b class='title'>DQL condition :** 1 AND 0
-&gt; 0
<b class='title'>DQL condition :** 1 AND NULL
-&gt; NULL
<b class='title'>DQL condition :** 0 AND NULL
-&gt; 0
<b class='title'>DQL condition :** NULL AND 0
-&gt; 0
</pre>
</li>
<li>
OR
Logical OR. When both operands are
non-NULL, the result is
1 if any operand is non-zero, and
0 otherwise. With a
NULL operand, the result is
1 if the other operand is non-zero, and
NULL otherwise. If both operands are
NULL, the result is
NULL.
<b class='title'>DQL condition :** 1 OR 1
-&gt; 1
<b class='title'>DQL condition :** 1 OR 0
-&gt; 1
<b class='title'>DQL condition :** 0 OR 0
-&gt; 0
<b class='title'>DQL condition :** 0 OR NULL
-&gt; NULL
<b class='title'>DQL condition :** 1 OR NULL
-&gt; 1
</pre>
</li>
<li>
<a name="function_xor"></a>
<a class="indexterm" name="id2965520"></a>
XOR
Logical XOR. Returns NULL if either
operand is NULL. For
non-NULL operands, evaluates to
1 if an odd number of operands is
non-zero, otherwise 0 is returned.
<b class='title'>DQL condition :** 1 XOR 1
-&gt; 0
<b class='title'>DQL condition :** 1 XOR 0
-&gt; 1
<b class='title'>DQL condition :** 1 XOR NULL
-&gt; NULL
<b class='title'>DQL condition :** 1 XOR 1 XOR 1
-&gt; 1
</pre>
a XOR b is mathematically equal to
(a AND (NOT b)) OR ((NOT a) and b).
</li>