HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Web SQL Delete Demo</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 1.5rem; line-height: 1.5; }
    button { padding: 0.5rem 0.9rem; cursor: pointer; }
    #status { margin-top: 1rem; }
  </style>
</head>
<body>
  <h1>Web SQL DELETE</h1>
  <button type="button" id="deleteBtn" disabled>Delete id 1</button>
  <p id="status">Opening&hellip;</p>

  <script>
    var statusEl = document.getElementById('status');
    var deleteBtn = document.getElementById('deleteBtn');

    if (!window.openDatabase) {
      statusEl.textContent = 'Web SQL is not available in this browser.';
    } else {
      var db = openDatabase('tryitWsqlDeleteDemoPage', '1.0', 'Demo', 1024 * 1024);

      db.transaction(function (tx) {
        tx.executeSql(
          'CREATE TABLE IF NOT EXISTS items (id INTEGER PRIMARY KEY, value TEXT)'
        );
        tx.executeSql(
          'INSERT OR REPLACE INTO items (id, value) VALUES (?, ?)',
          [1, 'Sample']
        );
      }, function (err) {
        statusEl.textContent = 'Could not open the database: ' + err.message;
      }, function () {
        statusEl.textContent = 'Ready. Click Delete.';
        deleteBtn.disabled = false;
      });

      deleteBtn.addEventListener('click', function () {
        db.transaction(function (tx) {
          tx.executeSql(
            'DELETE FROM items WHERE id = ?',
            [1],
            function (tx, result) {
              statusEl.textContent = 'Deleted ' + result.rowsAffected + ' row (id 1).';
            },
            function (tx, error) {
              statusEl.textContent = 'Error: ' + error.message;
              return true;
            }
          );
        });
      });
    }
  </script>
</body>
</html>
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Web SQL DELETE — Complete HTML Demo
