78 lines
2.2 KiB
HTML
78 lines
2.2 KiB
HTML
<title>Web SQL Database - rollback test</title>
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<style>
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#status {
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padding: 5px;
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color: #fff;
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background: #ccc;
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}
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#status.error {
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background: #c00;
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}
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#status.ok {
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background: #0c0;
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}
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label {
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float: left;
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display: block;
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width: 125px;
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line-height: 32px;
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}
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#tweets {
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max-height: 300px;
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overflow: auto;
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border: 3px solid #ccc;
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}
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#tweets ul {
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margin: 0;
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/* list-style: none;*/
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padding: 5px;
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}
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#tweets li {
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padding-bottom: 5px;
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padding-top: 5px;
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border-top: 1px solid #ccc;
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}
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#tweets li:first-child {
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border-top: 0;
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}
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</style>
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<article>
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<section>
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<p>This code creates a table called 'foo' and inserts a single row. In a separate transaction, it drops the table then tries to insert in to the table 'foo' - obviously failing. That failure should cause the transaction to rollback, and leave the table 'foo' intact. The next transaction tries to select a row from the 'foo' table. If the rollback succeeds, you should see the status change to 'found rows'.</p>
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<p>Status:</p>
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<section id="status" class="ok">ready</section>
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</section>
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</article>
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<script>
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var db = openDatabase('foo', '1.0', 'foo', 2 * 1024);
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db.transaction(function (tx) {
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tx.executeSql('CREATE TABLE IF NOT EXISTS foo (id unique, text)');
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tx.executeSql('INSERT INTO foo (id, text) VALUES (1, "foobar")');
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document.querySelector('#status').innerHTML = '<p>foo created and row inserted.</p>';
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});
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db.transaction(function (tx) {
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tx.executeSql('DROP TABLE foo');
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// known to fail - so should rollback the DROP statement
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tx.executeSql('INSERT INTO foo (id, text) VALUES (1, "foobar")');
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}, function (err) {
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document.querySelector('#status').innerHTML += '<p>should be rolling back caused by: <code>' + err.message + '</code></p>';
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});
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db.transaction(function (tx) {
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tx.executeSql('SELECT * FROM foo', [], function (tx, results) {
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document.querySelector('#status').innerHTML += '<p>found rows (should be 1): ' + results.rows.length + '</p>';
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}, function (tx, err) {
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document.querySelector('#status').innerHTML += '<p>failed (rollback failed): <em>' + err.message + '</em></p>';
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document.querySelector('#status').className = 'error';
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});
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});
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</script> |