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  <title>Web SQL — INSERT & SELECT</title>
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    body {
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      color: #334155;
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    h1 { margin: 0 0 0.5rem; font-size: 1.25rem; color: #0f172a; }
    p { margin: 0 0 1rem; max-width: 440px; }
    .btn-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
    button {
      padding: 0.55rem 1rem;
      font-size: 0.9375rem;
      background: #2563eb;
      color: #fff;
      border: none;
      border-radius: 8px;
      cursor: pointer;
    }
    button.secondary { background: #0f766e; }
    button:hover { filter: brightness(1.08); }
    #status, #results {
      margin-top: 0.75rem;
      padding: 0.75rem 1rem;
      max-width: 440px;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 0.875rem;
    }
    #status.ok { border-left: 4px solid #22c55e; }
    #status.err { border-left: 4px solid #ef4444; }
    pre { margin: 0; white-space: pre-wrap; font-size: 0.8125rem; }
    .hint {
      margin-top: 1rem;
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      max-width: 440px;
    }
    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }
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</head>
<body>
  <h1>Insert and read rows</h1>
  <p>Run <code>INSERT</code> with <code>?</code> bindings, then <code>SELECT *</code> to list every contact.</p>

  <div class="btn-row">
    <button type="button" id="insertBtn">Insert sample contact</button>
    <button type="button" id="selectBtn" class="secondary">Get all contacts</button>
  </div>

  <p id="status">Ready.</p>
  <div id="results" hidden>
    <strong>Query results:</strong>
    <pre id="resultsPre"></pre>
  </div>
  <p class="hint">Web SQL is deprecated — this demo is for learning only.</p>

  <script>
    var statusEl = document.getElementById('status');
    var resultsEl = document.getElementById('results');
    var resultsPre = document.getElementById('resultsPre');

    if (!window.openDatabase) {
      statusEl.textContent = 'Web SQL is not supported in this browser.';
      statusEl.className = 'err';
    } else {
      var db = openDatabase('tryitIntro', '1.0', 'Intro Demo DB', 1024 * 1024);

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

      document.getElementById('insertBtn').addEventListener('click', function () {
        var id = Date.now();
        db.transaction(function (tx) {
          tx.executeSql(
            'INSERT INTO contacts (id, name, email) VALUES (?, ?, ?)',
            [id, 'Alex Rivera', 'alex@example.com'],
            function (tx, result) {
              statusEl.textContent = 'Inserted contact id ' + id;
              statusEl.className = 'ok';
            },
            function (tx, error) {
              statusEl.textContent = 'Insert error: ' + error.message;
              statusEl.className = 'err';
              return true;
            }
          );
        });
      });

      document.getElementById('selectBtn').addEventListener('click', function () {
        db.transaction(function (tx) {
          tx.executeSql(
            'SELECT * FROM contacts ORDER BY id',
            [],
            function (tx, results) {
              var lines = [];
              for (var i = 0; i < results.rows.length; i++) {
                var row = results.rows.item(i);
                lines.push('id=' + row.id + ', name=' + row.name + ', email=' + row.email);
              }
              resultsPre.textContent = lines.length ? lines.join('\n') : '(no rows yet — insert one first)';
              resultsEl.hidden = false;
              statusEl.textContent = 'Found ' + results.rows.length + ' row(s).';
              statusEl.className = 'ok';
            },
            function (tx, error) {
              statusEl.textContent = 'Select error: ' + error.message;
              statusEl.className = 'err';
              return true;
            }
          );
        });
      });
    }
  </script>
</body>
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Web SQL — Insert & Select Rows
