How can I loop through a MySQL result set multiple times using the mysql_* functions?

Looping Through MySQL Result Sets Multiple Times with the mysql_* Functions

Looping through a MySQL result set multiple times using the mysql_* functions is a common task that can be achieved using the mysql_data_seek() function.

To repeat a loop over a result set, simply follow these steps:

1. Execute a MySQL query and store the result set in a variable:

   $result = mysql_query(/* Your query */);

2. Use the mysql_fetch_assoc() function to fetch data from the result set and perform necessary processing:

   while ($row = mysql_fetch_assoc($result)) {
       // ...
   }

3. Reset the result set pointer to the beginning using mysql_data_seek():

   mysql_data_seek($result, 0);

4. Repeat the mysql_fetch_assoc() loop to iterate through the result set again:

   while ($row = mysql_fetch_assoc($result)) {
       // ...
   }

It's important to note that this approach may not be the most efficient way to handle the need for multiple loops. It can be more efficient to preprocess the data into a different structure, such as an array, and then perform operations on it rather than looping over the result set several times.

The above is the detailed content of How can I loop through a MySQL result set multiple times using the mysql_* functions?. For more information, please follow other related articles on the PHP Chinese website!