Save Image in SAP using OData

Hi All,

          Please guid me how to save base64 string to sap.

I created Data , model for odata and i added in service.

I am using javascript and html5 to consume sap data.

I am using post method in URL. I can post data from my html file to SAP.

Now i want to extend my application to save image also in sap.

In javascript i have base64 string.

I have following doubts.

1. which data type i need to use in SAP entity structure to read base64 string data.

2.How to save Base64 string data in table.