Node.JS reading BLOB from mysql

问题

I'm using the Node.JS node-mysql module. One column has a BLOB type and want to read from it and if possible base64 encode it. I haven't been able to find anything on how to do this.

Any ideas?

回答1:

Try the following snippet:

var buffer = new Buffer( blob );
var bufferBase64 = buffer.toString('base64');

If your blob is binary, use the following instead:

var buffer = new Buffer( blob, 'binary' );
var bufferBase64 = buffer.toString('base64');

You can also simplify that to one line:

var bufferBase64 = new Buffer( blob, 'binary' ).toString('base64');

回答2:

Of note: mysql-node automatically converts Blob objects into javascript Buffer objects.
The above answer addresses base64 encoding.

For me, the simplest way to just read it as a string in node was: myObject.myBlobAttr.toString('utf-8')

---

As of Jan 28, 2015,
From Felix's mysql-node page:

Type casting

For your convenience, this driver will cast mysql types into native JavaScript types by default. The following mappings exist:

...

Buffer

TINYBLOB
MEDIUMBLOB
LONGBLOB
BLOB
BINARY
VARBINARY
BIT (last byte will be filled with 0 bits as necessary)

---

Edit Alternate option for UTF-8 (?)

String.fromCharCode.apply(null, new Uint16Array(myObject.myBlobAttr));

来源：https://stackoverflow.com/questions/9042327/node-js-reading-blob-from-mysql