add cleanall task

Makefile

@@ -42,6 +42,7 @@ clean:
 cleanparser:
 	make -C $(SRCPARSER)/ clean
 
+cleanall: clean cleanparser
 
 ############
 ### Test ###

example/example.cpp

@@ -1,4 +1,5 @@
 
+// include the sql parser
 #include "SQLParser.h"
 
 int main(int argc, char *argv[]) {
@@ -6,12 +7,12 @@ int main(int argc, char *argv[]) {
         fprintf(stderr, "Usage: ./example \"SELECT * FROM test;\"\n");
         return -1;
     }
-
-
     std::string query = argv[1];
 
+    // parse a given query
     hsql::SQLStatementList* stmt_list = hsql::SQLParser::parseSQLString(query);
 
+    // check whether the parsing was successful
     if (stmt_list->isValid) {
         printf("Parsed successfully!\n");
         printf("Number of statements: %lu\n", stmt_list->numStatements());