Search Results

An insert should accept input, validate it, store it with a prepared statement and report a useful result. Example form <form method="post"> <label for="activity_name">Activity name</label> <input id="activity_name" name="activity_name" maxlength="100" req...

A useful output begins with a query and ends with accessible, escaped HTML. Select only required fields $stmt = $pdo->query( "SELECT activity_id, activity_name, location, capacity FROM activities ORDER BY activity_name" ); $activities = $stmt->fe...

Filters help users reduce a dataset to relevant records. Sorts place those records in a useful order. Filter with a prepared value $location = trim($_GET["location"] ?? ""); $stmt = $pdo->prepare( "SELECT activity_name, location, capacity FROM activit...

An update changes an existing row. The application must identify the row, validate changes and prevent unintended updates. Load the selected record $id = filter_input(INPUT_GET, "id", FILTER_VALIDATE_INT); if (!$id) { exit("Invalid activity."); } $stmt = $...

A role-based system must enforce permissions on the server. Hiding a link is helpful navigation, but it does not protect the page. Store trusted session values at login After verifying the password and retrieving the database user: session_regenerate_id(true);...

CSV means comma-separated values. Each line is a record and each position represents a field. match_id,team_name,wins,losses M001,Fictional Falcons,4,1 M002,Sample Sharks,3,2 The first row is a header. Quoted fields may contain commas, so do not process CSV wi...

Design the destination table from the meaning of the data, not merely its appearance in a spreadsheet. CSV field MySQL type Rule match_id VARCHAR(20) unique and required team_name VARCHAR(100) required wins INT zero or greater losses INT zero or greater CREATE...

A CSV upload changes stored data and should be restricted to administrators. Apply session and role checks before any output. <?php session_start(); if (!isset($_SESSION["user_id"])) { header("Location: login.php"); exit; } if (($_SESSION["role"] ?? ""...

Validate the upload before reading its rows. $file = $_FILES["dataset"] ?? null; $errors = []; if (!$file || $file["error"] !== UPLOAD_ERR_OK) { $errors[] = "Choose a CSV file that uploaded successfully."; } if ($file && $file["size"] > 2 * 1024 * 1024) { ...

Use PHP’s CSV parser so quoted commas and escaped values are handled correctly. $handle = fopen($file["tmp_name"], "r"); if ($handle === false) { exit("The uploaded file could not be read."); } $headers = fgetcsv($handle); $expected = ["match_id", "team_na...

Validate every row before storing it. if (count($row) !== 4) { $rowErrors[] = "Row $rowNumber has the wrong number of fields."; continue; } [$matchId, $teamName, $winsRaw, $lossesRaw] = array_map("trim", $row); $wins = filter_var($winsRaw, FILTER_VALID...

Prepare the insert once, then execute it for each valid row. $insert = $pdo->prepare( "INSERT INTO team_results (match_id, team_name, wins, losses) VALUES (:match_id, :team_name, :wins, :losses)" ); $insert->execute([ "match_id" => $matchId, "...

An administrator needs evidence of what happened, not just “upload complete”. Report useful totals Show the escaped filename, rows read, inserted, updated, skipped and rejected, plus row-specific validation messages and whether a transaction committed or rolle...

A complete import combines access control, upload checks, parsing, row validation, prepared statements and a result summary. Processing sequence Start the session and require the administrator role. Accept a POST upload. Validate upload status, size and extens...

Testing must cover permissions, validation, database effects and feedback. Test Condition Expected result Logged out Direct import URL Redirect to login Standard role Direct URL or POST 403; nothing imported Valid CSV Correct headings and rows Expected records...

A query is meaningful when it answers a user question. Begin with the need, then choose fields, filters, calculations and order. Example need A participant wants to find the strongest fictional teams and inspect their performance. SELECT team_name, SUM(...

A leaderboard converts stored results into a ranked, understandable output. SELECT team_name, SUM(wins) AS wins, SUM(losses) AS losses, SUM(wins) * 3 AS points FROM team_results GROUP BY team_name ORDER BY points DESC, wins DESC, team_name...