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jmalla
Contributor
7,207
Though there are lots of articles on posting attachments through SAPUI5 and parsing them in XSJS, I had to dig through them to find the solution to upload an image and save this as a BLOB in the HANA database.  So I decided to create a simple BLOG so that anyone else, could do this easily in a matter of minutes.

  • Here is the database table definition:


CREATE COLUMN TABLE "MYSCHEMA"."IMAGE_STORE"(
"IMAGE_NAME" NVARCHAR(100),
"IMAGE_CONTENT" BLOB MEMORY THRESHOLD 1000,
PRIMARY KEY (
"IMAGE_NAME"
)
) UNLOAD PRIORITY 5 AUTO MERGE;

 

 

Here is my control in my xml page:

 
<u:FileUploader id="fileUploader" name="myFileUpload" uploadUrl="" width="400px" tooltip="Upload your file to the local server" uploadComplete="handleUploadComplete"/>
<Button text="Upload File" press="handleUploadPress"/>

 

  • The attachment will be sent as a MIME object through the controller:


		handleUploadPress: function(oEvent) {
var oFileUploader = this.getView().byId("fileUploader");
// Combine the URL with the filename....
oFileUploader.setUploadUrl("../MyXSJS_Listener/SaveImage.xsjs?filename=" + oFileUploader.getValue());
oFileUploader.upload();
},


  • In XSJS, simply read in the request into an ArrayBuffer and store as a BLOB.  This is the main part - reading the data as an ArrayBuffer and then writing as a BLOB with the setBlob method on the prepared statement:


 
	var schema_name = "MYSCHEMA";
var filename = $.request.parameters.get('filename');


try {
var conn = $.db.getConnection();

var pstmt = conn.prepareStatement("INSERT INTO \"MYSCHEMA\".\"IMAGE_STORE\" (IMAGE_NAME, IMAGE_CONTENT) VALUES (?, ?)");


if($.request.entities.length>0) {

// Read in the posted image or binary data as an Array Buffer - you can use this to save as a BLOB
var file_body = $.request.entities[0].body.asArrayBuffer();

pstmt.setString(1,filename); // Set the file name
pstmt.setBlob(2,file_body); // Set the Blob as the array buffer that has the image data
pstmt.execute();

}
else
{
$.response.setBody("No Entries in request");
}
pstmt.close();
conn.commit();
conn.close();
$.response.contentType = "text/html";
$.response.setBody("[200]:Upload for file" + filename + " was successful!");
}
catch(err)
{
if (pstmt !== null)
{
pstmt.close();
}
if (conn !== null)
{
conn.close();
}
$.response.contentType = "text/html";
$.response.setBody("File could not be saved in the database. Here is the error:" + err.message);
}

 

 

I hope this helps anyone looking to do something similar.


Thanks,


Jay


 

You can connect with me at - Jay Malla on LinkedIn

 
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