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Posted by Jerry on 05/18/06 08:51
I am a MySQL and PHP newbie. I am having trouble getting the $w variable in
my code below passed to mysql. When I use the value of $w directly in the
Where clause, the correct rows are returned. However, when I try to use the
variable in the Where clause, either an error occurs or no rows are
returned. Any thoughts greatly appreciated!
I am using php-4.4.2 and MySQL-4.1.18-0 on Suse 9.1
Jerry
<html>
<body>
<?php
$link = mysql_connect('localhost:3306', 'mysql');
mysql_select_db('test_ermd') or die('Could not select database');
$w = 'exec';
// I have tried all the variations below to get the value of $w to process
in the WHERE clause
//------------------------------------------------------------------------------------------
//$query = 'SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX, EMAIL
FROM officers WHERE GRP = "exec"';
//--This works: all rows with 'exec' in GRP column are selected
//$query = 'SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX, EMAIL
FROM officers WHERE GRP = $w';
//--Invalid query: Unknown column '$w' in 'where clause'
//--Whole query: SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX,
EMAIL FROM officers WHERE GRP = $w
//$query = 'SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX, EMAIL
FROM officers WHERE GRP = \"$w\"';
//--Invalid query: You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use
near '\"$w\"' at line 1
//--Whole query: SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX,
EMAIL FROM officers WHERE GRP = \"$w\"
//$query = 'SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX, EMAIL
FROM officers WHERE GRP = \$w';
//--Parse error: syntax error, unexpected T_STRING
in /usr/local/bin/apache2/htdocs/test_ermd.php on line 34
//$query = 'SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX, EMAIL
FROM officers WHERE GRP = "\$w"';
//--No rows are selected
//$query = 'SELECT TITLE, NAME, INST, ADD1, ADDR2, ADDR3, PH, FAX, EMAIL
FROM officers WHERE GRP = \'$w\'';
//--No rows are selected
//------------------------------------------------------------------------------------------
echo 'Raw query: ' . $query;
$result = mysql_query($query);
if (!$result) {
$message = 'Invalid query: ' . mysql_error() . "<br>";
$message .= 'Whole query: ' . $query;
die($message);
}
while ($row = mysql_fetch_assoc($result)) {
foreach ($row as $key => $value) {
if ($value) {
echo "$value";
echo "<br>";
}
}
echo "<p>";
}
mysql_free_result($result);
mysql_close($link);
?>
</body>
</html>
//====================================================================
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