Why Was My PHP File Execution Interrupted and How Did I Fix It?

PHP File Execution Interruption

In a recent coding effort, a PHP function used to handle requests from an Android app encountered an issue where certain portions of the code were not being executed. Specifically, the program could not access a specific section where a file was being created.

Upon investigation, the debugging files created by the developer revealed that the code within the section was not being entered. This prompted a deeper analysis of the code, focusing on the query and database operations.

Decoding the Error

While executing the query, the program occasionally received an error message stating "unknown table status: TABLE_TYPE." This confusing message pointed to an issue with the database connection.

Refactoring for Efficiency

The initial approach of writing a large function with multiple lines dedicated to file writing and database manipulation proved inefficient and prone to errors. To address this, the developer opted for a more modular design.

Two new functions were introduced: file_put(), which handled writing to files, and checkin(), which handled the database operations. Dividing the code in this manner allowed for easier debugging and refactoring.

Refined Database Interaction

The database interactions were wrapped in a MySql class, providing a more structured and error-resistant interface to the database. The class handled connection establishments, query execution, and error handling, simplifying the database operations within the checkin() function.

Revamped Code Example

The revised code now utilizes the new file_put() and MySql functions, resulting in a more organized and manageable structure.

<code class="php">function file_put($number, $data)
{
    $path = sprintf("C:/temp/wamp/www/file%d.txt", $number);
    file_put_contents($path, $data);
}

function checkin(MySql $DB, $TechID, $ClientID, $SiteID)
{
    $query = sprintf("SELECT `Type` FROM `Log` WHERE `TechID` = '%d' ORDER BY LogTime DESC LIMIT 1", $TechID);
    file_put(5, $query);

    $result1 = $DB->query("SELECT COUNT(*) FROM Log");    
    $result2 = $DB->query($query);

    foreach ($result1 as $row1) {
        list($count) = $row1;
        $data = "ClientID:$ClientID TechID:$TechID SiteID:$SiteID Count:$count";
        file_put(3, $data);
        foreach ($result2 as $row2) {
            file_put(4, $data);
        }
    }
}

$config = array(
    'server' => 'localhost',
    'name' => 'root',
    'password' => '',
    'db' => 'test',
);
$db = new MySql($config);

checkin($db, 1, 2, 3, 4);</code>

Conclusion

By refactoring the code, handling database interactions through a class, and dividing the responsibilities between multiple functions, the problem of the code section not being executed was resolved. The resulting code is more modular, easier to debug, and robust.

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