Vim: Find and replace in a large project?

Question

There's a way to replace all occurencies of a string in files in Vim using a combination of args and argdo commands. Unfortunately there's a drawback with this solution: It will open all files which may be a problem for large projects. Does anyone know more compact and memory efficient way?

Answer 1

find projectfolder -type f -exec grep -Iq 'pattern' {} \; -exec vim {} +

Answer 2

Here's how I do it (when I'm not using perl):

find . -name '*.java' -exec vim +'%s/OldName/NewName/gc' +'wq' {} \;

i.e. replace "OldName" with "NewName" in all "*.java" files, but prompt me for confirmation for each substitution.