SQL查询：根据列值隐藏项目？

Question

I am pulling some data from table in a MySQL database. Inside this table is a column called "hidden", by default it is set to 0, but when an item needs to be hidden, it will be set to 1. So I need a code that I can use that will hide all rows if the "hidden" column is set to 1.

Lets say my code is something simple like this:

<?php
$result = mysql_query("SELECT * FROM clients ORDER BY name") 
or die(mysql_error());  
while($row = mysql_fetch_array( $result )) {
echo $row['name'];
} 
?>

Is there a simple code I can add to it?

Answer 1

Add WHERE clause on it

SELECT * 
FROM clients 
WHERE hidden = 0
ORDER BY name

The query above will only show items that are not hidden.

Answer 2

$result = mysql_query("SELECT * FROM clients WHERE hidden = 0 ORDER BY name");

这可能是最简单的方法。

Answer 3

There are 2 options:

1) if you always want those rows hidden then you don't even have to load them by altering your query.

SELECT * FROM clients WHERE hidden=0 ORDER BY name;

2) You can check that value in the while loop.

while($row = mysql_fetch_array( $result )) {
   if($row['hidden']==0) echo $row['name'];
}

Answer 4

Your current query

SELECT * FROM clients ORDER BY name

retrieves every row in the table. If you want to hide (not retrieve) rows where the value of the hidden column is 1 then just add a WHERE clause to check that hidden is not equal to 1 .

SELECT * FROM clients WHERE hidden = 0 ORDER BY name

Answer 5

    <?php
$result = mysql_query("SELECT * FROM clients WHERE hidden=0 ORDER BY name") 
or die(mysql_error());  
while($row = mysql_fetch_array( $result )) {
echo $row['name'];
} 
?>

Answer 6

$result = mysql_query("SELECT * FROM clients WHERE hidden=0 ORDER BY name");

will return only the rows which are not hidden.

Also, if this is a new program you are going to write, use MySqli or PDO instead of the mysql_* functions since they are deprecated. See - http://us.php.net/mysqli and http://us.php.net/pdo