diff --git a/mongodb_operations b/mongodb_operations
new file mode 100644
index 0000000..5f0d666
--- /dev/null
+++ b/mongodb_operations
@@ -0,0 +1,6 @@
+利用js代码从mongodb中导出查询数据到文件中
+var c = db.list_users_sponsor_listing.find({sponsorsListing:{$ne:null}});
+while(c.hasNext()) {
+    printjson(c.next());
+}
+mongo localhost:27017/ghtorrent0619 sponsorsListing_notnull.js > sponsorsListing_notnull.json
\ No newline at end of file