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  <title>Web SQL — reusable updateRecord()</title>
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  <h1>Reusable updateRecord(id, name, age) function</h1>
  <p>One function, called twice: once for id <code>1</code> (exists) and once for id <code>2</code> (missing).</p>

  <div class="btns">
    <button type="button" id="seedBtn" class="secondary">1. Seed id 1</button>
    <button type="button" id="updateBothBtn">2. updateRecord(1) and updateRecord(2)</button>
  </div>

  <div id="log">Click Seed, then run updateRecord on both ids.</div>
  <p class="hint">If Web SQL is not supported, the log will tell you.</p>

  <script>
    var logEl = document.getElementById('log');

    function log(line) {
      logEl.textContent += (logEl.textContent && logEl.textContent !== 'Click Seed, then run updateRecord on both ids.' ? '\n' : '') + line;
    }

    if (!window.openDatabase) {
      logEl.textContent = 'Web SQL is not supported in this browser.';
    } else {
      var db = openDatabase('tryitDemo', '1.0', 'Try It DB', 1024 * 1024);

      db.transaction(function (tx) {
        tx.executeSql(
          'CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY, name TEXT, age INTEGER)'
        );
      });

      function updateRecord(id, newName, newAge) {
        db.transaction(function (tx) {
          tx.executeSql(
            'UPDATE users SET name = ?, age = ? WHERE id = ?',
            [newName, newAge, id],
            function (tx, result) {
              log('Updated ' + result.rowsAffected + ' row(s) for id ' + id);
            },
            function (tx, error) {
              log('Error updating id ' + id + ': ' + error.message);
              return true;
            }
          );
        });
      }

      document.getElementById('seedBtn').addEventListener('click', function () {
        db.transaction(function (tx) {
          tx.executeSql(
            'INSERT OR REPLACE INTO users (id, name, age) VALUES (?, ?, ?)',
            [1, 'John Doe', 25],
            function () {
              logEl.textContent = 'Seeded id 1 (John Doe, 25).';
            }
          );
        });
      });

      document.getElementById('updateBothBtn').addEventListener('click', function () {
        logEl.textContent = '';
        updateRecord(1, 'Jane Doe', 26);
        updateRecord(2, 'Alex Kim', 30);
      });
    }
  </script>
</body>
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Web SQL UPDATE — Reusable updateRecord Function
