SQL Insert Statement not Working in Javascript

问题

I'm trying to get my WebSQL database to popluate using a JSON array (Object is called myJSONObject, array is called costcodes).

The function runs on click, the database successfully creates, but the data is not inserted into the database. It doesn't even throw and error, it just doesn't do anything.

My initial thought was that the data isn't escaped properly, but I don't know exactly where/how to escape it. So I'm stumped.

    localDB = null;

    function initDB()
    {
        if (localDB==null)
        {
            var shortName = 'Costcode';
            var version = '1.0';
            var displayName = 'Costcode';
            var maxSize = 217802; // in bytes
            localDB = window.openDatabase(shortName, version, displayName, maxSize);
        }

    }
            function buildTable()
    {
       var sQuery = 'CREATE TABLE IF NOT EXISTS Costcode ('+
                    'id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,' +
                    'cost_code_no VARCHAR NULL,' +
                    'row_unique_no VARCHAR NULL,' +
                    'cost_class_no VARCHAR NULL,' +
                    'Table_Version VARCHAR DEFAULT "1.0");';
        try
        {
            initDB();
            localDB.transaction(function(transaction)
            {
                transaction.executeSql(sQuery, []);
                console.log('sucess');
            });
        }
        catch (e)
        {
           alert("Error: Unable to create table 'x" + "' " + e + ".");
           return;
       }    
    }


 function exeSQLFast()
    {

                initDB();
                localDB.transaction(function(transaction)
                {
                    for (var x = 0; x <myJSONObject.costcodes.length; x++)
                    {

                        var costcodeno = myJSONObject.costcodes[x].cost_code_no;
                        var rowuniqueid = myJSONObject.costcodes[x].row_unique_id;
                        var costclassno = myJSONObject.costcodes[x].cost_class_no;
                        console.log(costcodeno);
                        console.log(rowuniqueid); 
                        console.log(costclassno);
                    transaction.executeSql('INSERT INTO Costcode (cost_code_no, row_unique_id, cost_class_no) VALUES (? , ? , ?)',
                     [costcodeno,
                     rowuniqueid,
                     costclassno]
                     , function(transaction, results)
                        {
                            console.log(costcodeno);
                            console.log('hooray');
                        }

                    )};
                    }
            )}

</script>
</head>

<body onLoad="buildTable();">
<input type="button" onClick="exeSQLFast();" value='button'>
</body>
</html>

The console log shows that the variables are all being properly defined, but it's not running the insert statement. Any ideas?

Here's an example of myJSONObject.costcodes[2]

cost_class_no: "    3"
cost_code_no: "      1000"
row_unique_id: 335

That looks like a problem doesn't it...

回答1:

The problem was that I called the row_unique_no column row_unique_id in the insert statement. Now I feel stupid.

But if anyone is curious how to populate a WebSQL database properly, this is how you do it. Just don't mistype the column names.

来源：https://stackoverflow.com/questions/10251419/sql-insert-statement-not-working-in-javascript

标签

javascript

sql

json

html5

web-sql