I have a certain table in mySQL which has a field called "image" with a datatype of "BLOB". I was wondering if it is possible to upload an image in that field directly from the Command Line Client rather than doing it through php...If it is possible, then where exactly should I place my image files?
Try using the LOAD_FILE() function.
UPDATE `certain_table` SET image = LOAD_FILE('/full/path/to/new/image.jpg') WHERE id = 1234;
See the manual for requirements about the path to the filename, privileges, etc.