Why Does My PHP Function Fail to Execute a Specific Code Section, Leading to 'unknown table status: TABLE_TYPE' Errors?

PHP Function Struggles to Execute Partially

Problem:

A PHP function responsible for handling server requests encounters an issue where it fails to enter a specific code region. The function begins by establishing a database connection and writing data to files. Subsequent queries attempt to retrieve data but result in the error "unknown table status: TABLE_TYPE."

Solution:

Code Refactoring and Database Abstraction:

To reduce code complexity and improve error handling, the original code is refactored. Firstly, a separate function is created for file writing, simplifying file operations.

Secondly, the database connection and queries are abstracted into a separate MySQL class. This allows for more flexible database access and error handling outside of the main function.

Example:

File Writing Function:

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

Database Class:

class MySql
{
    // Properties for database connection
    // ...

    // Database connection method
    private function connect($server, $name, $password)
    {
        // Connect and error handling
    }

    // Database query method
    public function query($query)
    {
        // Establish connection if not already done
        // Execute query and return result
    }
}

Revised Checkin Function:

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);
        }
    }
}

By implementing code refactoring and database abstraction, the original function is simplified, error handling is improved, and the ability to execute all code regions is restored.

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