See what you make of this...
Below is a working flow - showing you how to download a CSV file (without actually saving it - i.e. straight from a database)...
[{"id":"44c05d20.061c54","type":"csv","z":"5a19214e.b8927","name":"","sep":",","hdrin":"","hdrout":true,"multi":"mult","ret":"\\r\\n","temp":"ID_and_s,V_izq,V_der,F_izq,F_der,tiempo_mili,timestamp","skip":"0","strings":false,"x":630,"y":260,"wires":[["8dc0605f.24598"]]},{"id":"34a65b72.79dea4","type":"http response","z":"5a19214e.b8927","name":"","statusCode":"","headers":{},"x":1010,"y":260,"wires":[]},{"id":"7239ac2b.0780d4","type":"catch","z":"5a19214e.b8927","name":"","scope":null,"uncaught":false,"x":240,"y":320,"wires":[["77f0bc63.66e014","36eadc67.10b2c4"]]},{"id":"77f0bc63.66e014","type":"function","z":"5a19214e.b8927","name":"Set 404","func":"msg.payload = msg.error;\nmsg.statusCode = 404;//resource not found\nreturn msg;","outputs":1,"noerr":0,"x":800,"y":320,"wires":[["34a65b72.79dea4"]]},{"id":"36eadc67.10b2c4","type":"debug","z":"5a19214e.b8927","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":270,"y":380,"wires":[]},{"id":"1bf4dcb6.c14383","type":"ui_template","z":"5a19214e.b8927","group":"754a23fa.82988c","name":"ui_temlplate - present download link on dashboard","order":0,"width":0,"height":0,"format":"<div >\n <a href=\"/data\">HAZ CLICK PARA DESCARGAR</a>\n</div>","storeOutMessages":true,"fwdInMessages":true,"resendOnRefresh":false,"templateScope":"local","x":610,"y":380,"wires":[[]]},{"id":"f5c7c9b1.bdf808","type":"http in","z":"5a19214e.b8927","name":"","url":"/data","method":"get","upload":false,"swaggerDoc":"","x":240,"y":260,"wires":[["20cff092.556bc"]]},{"id":"20cff092.556bc","type":"function","z":"5a19214e.b8927","name":"** Database Call **","func":"msg.payload 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msg;","outputs":1,"noerr":0,"x":430,"y":260,"wires":[["44c05d20.061c54"]]},{"id":"8dc0605f.24598","type":"function","z":"5a19214e.b8927","name":"Set Headers","func":"msg.headers = {}\nmsg.headers[\"Content-type\"] = \"text/csv\";\nmsg.headers[\"Content-Disposition\"] = \"attachment; filename=data.csv\";\nmsg.headers[\"Pragma\"] = \"no-cache\";\nmsg.headers[\"Expires\"] = \"0\";\nreturn msg;","outputs":1,"noerr":0,"x":790,"y":260,"wires":[["34a65b72.79dea4"]]},{"id":"ee46742a.c9c988","type":"comment","z":"5a19214e.b8927","name":"Replace \"Database Call\" with your database calls like i detailed in the screenshot on the forum","info":"","x":560,"y":200,"wires":[]},{"id":"754a23fa.82988c","type":"ui_group","z":"","name":"DESCARGAR DATOS A EXCEL:","tab":"be2f7523.3a90c8","order":4,"disp":true,"width":"12","collapse":false},{"id":"be2f7523.3a90c8","type":"ui_tab","z":"","name":"DESCARGAR DATOS","icon":"dashboard","order":1,"disabled":false,"hidden":false}]
You will need to integrate this with your database calls - as I describe in the screen shot comments.
