Storing and Retrieving images from DB2 using Worklight SQL Adapters?

问题

I'm trying to store images in DB2 Database as BLOB contents. I used JS to convert the image content to base64.

 function loadImageFileAsURL()
{
var filesSelected = document.getElementById("inputFileToLoad").files;
if (filesSelected.length > 0)
{
    var fileToLoad = filesSelected[0];

    var fileReader = new FileReader();

    fileReader.onload = function(fileLoadedEvent) 
    {
        var textAreaFileContents = document.getElementById
        (
            "textAreaFileContents"
        );

        textAreaFileContents.innerHTML = fileLoadedEvent.target.result;
        var ImgContent = fileLoadedEvent.target.result;
        $("#IMAGE").attr("src",ImgContent);

    };

    fileReader.readAsDataURL(fileToLoad);
}
}

Now I need to convert this base64 content to binary and store them to my DB2 Database. Is there any way to do this in JavaScript?

And how to fetch this data from the database and display it on my mobile app using Adapters. ?

回答1:

Why do you not simply store the image as encoded to base64 in database? I think this would be better in your scenario...

1. You receive an image
2. You use some library to handle the encoding to base64
   Review this question: Base64 encoding and decoding in client-side Javascript
3. You store the image-now a string, in the database
4. When you need to display the image in the app, fetch the contents and decode it (see step 2)

来源：https://stackoverflow.com/questions/22164828/storing-and-retrieving-images-from-db2-using-worklight-sql-adapters