openDatabase Hello World_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2022-12-24 12:48 出处：网络

I\'m trying to learn about openDatabase, and I think I\'m getting it to INSERT INTO TABLE1, but I can\'t verify that the SELECT * FROM TABLE1 is working.

I'm trying to learn about openDatabase, and I think I'm getting it to INSERT INTO TABLE1, but I can't verify that the SELECT * FROM TABLE1 is working.

<html>
<head>
<script src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("jquery", "1");
</script>
<script type="text/javascript">
var db;

$(function(){
    db = openDatabase('HelloWorld');

    db.transaction(
        function(transaction) {
            transaction.executeSql(
                'CREATE TABLE IF NOT EXISTS Table1 ' +
                '  (TableID INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ' +
                '   Field1 TEXT NOT NULL );'
            );
        }
    );

    db.transaction(
        function(transaction) {
            transaction.executeSql(
                'SELECT * FROM Table1;',function (transaction, result) {
                    for (var i=0; i < result.rows.length; i++) {
            alert('1');
                        $('body').append(result.rows.item(i));
                    }
                }, 
                errorHandler
            );
        开发者_开发问答}
    );

    $('form').submit(function() {
        var xxx = $('#xxx').val();
        db.transaction(
            function(transaction) {
                transaction.executeSql(
                'INSERT INTO Table1 (Field1) VALUES (?);', [xxx], function(){
                    alert('Saved!');
                }, 
                errorHandler
                );
            }
        );
        return false;
    });
});

function errorHandler(transaction, error) {
    alert('Oops. Error was '+error.message+' (Code '+error.code+')');
    transaction.executeSql('INSERT INTO errors (code, message) VALUES (?, ?);', 
    [error.code, error.message]);
    return false;
}
</script>
</head>
<body>
<form method="post">
    <input name="xxx" id="xxx" />
    <p>
    <input type="submit" name="OK" />
    </p>
    <a href="http://www.google.com">Cancel</a>
</form>
</body>
</html>

You're almost there, there are only two things:

The if you want to use the SQL statement callback, you should supply to the executeSql method the parameters array argument, even if your query doesn't need any param.
You should get a field to show in your loop, result.rows.item(i) is an object that contains properties as your table fields.

Your select will work like this:

db.transaction(function(transaction) {
  transaction.executeSql('SELECT * FROM Table1',[], function (trx, result) {
    for (var i=0; i < result.rows.length; i++) {
      $('body').append(result.rows.item(i).Field1); // <-- getting Field1 value
    }
  }, errorHandler);
});

Check your example here.