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  <title>Web SQL — reusable deleteRecord()</title>
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    p { margin: 0 0 1rem; max-width: 460px; }
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  <h1>Reusable deleteRecord(id) function</h1>
  <p>One function, called twice: once for id <code>1</code> (exists) and once for id <code>99</code> (missing).</p>

  <div class="btns">
    <button type="button" id="seedBtn">1. Seed id 1</button>
    <button type="button" id="deleteBothBtn" class="danger">2. deleteRecord(1) and deleteRecord(99)</button>
  </div>

  <div id="log">Click Seed, then run deleteRecord 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 deleteRecord 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 items (id INTEGER PRIMARY KEY, name TEXT)'
        );
      });

      function deleteRecord(id) {
        db.transaction(function (tx) {
          tx.executeSql(
            'DELETE FROM items WHERE id = ?',
            [id],
            function (tx, result) {
              log('Deleted ' + result.rowsAffected + ' row(s) for id ' + id);
            },
            function (tx, error) {
              log('Error deleting id ' + id + ': ' + error.message);
              return true;
            }
          );
        });
      }

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

      document.getElementById('deleteBothBtn').addEventListener('click', function () {
        logEl.textContent = '';
        deleteRecord(1);
        deleteRecord(99);
      });
    }
  </script>
</body>
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Web SQL DELETE — Reusable deleteRecord Function
