Why Does My MySQL Query Only Return One Row When I Expect Multiple?

Susan Sarandon
Release: 2024-11-02 17:27:29
Original
397 people have browsed it

Why Does My MySQL Query Only Return One Row When I Expect Multiple?

Correcting Incorrectly Displayed MySQL Rows

Facing an issue where MySQL returns only one row when the expected result should be multiple? Let's explore this PHP code:

<code class="php">$query = mysql_query("SELECT `title`, `url_title` FROM `fastsearch` WHERE `tags` LIKE '%$q%' LIMIT 5");
$query2 = mysql_fetch_assoc($query);
print_r($query2);</code>
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This code is intended to fetch the first five matching rows from the fastsearch table based on a search query. However, the issue arises due to an incorrect usage of mysql_fetch_assoc.

Using a While Loop to Iterate over Rows

To resolve this, we need to use a while loop to iterate through all the matching rows and display them one by one. Here's the corrected code:

<code class="php">$query = mysql_query("SELECT `title`, `url_title` FROM `fastsearch` WHERE `tags` LIKE '%$q%' LIMIT 5");
while ($row = mysql_fetch_assoc($query)) {
    print_r($row);
}</code>
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In this updated code:

  1. The $query variable is correctly spelled.
  2. A while loop is used to iterate over the result set.
  3. $row is assigned the current row using mysql_fetch_assoc inside the loop.
  4. print_r($row) displays the current row each time through the loop.

Additional Notes:

  • Ensure that the MySQL extension is installed and enabled in your PHP configuration.
  • Verify that the $q variable contains the correct search query.
  • Rows are returned in an associative array, where the field names are the keys.
  • The corrected code will display all matching rows up to the specified limit (5 in this case).

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source:php.cn
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