Adding function to return the count of database changes.

Author: Renatho Azevedo

hdr/sqlite_modern_cpp.h

@@ -103,7 +103,7 @@ namespace sqlite {
 				errors::throw_sqlite_error(hresult, sql());
 			}
 		}
-		
+
 		std::string sql() {
 #if SQLITE_VERSION_NUMBER >= 3014000
 			auto sqlite_deleter = [](void *ptr) {sqlite3_free(ptr);};
@@ -124,7 +124,7 @@ namespace sqlite {
 				_next_index();
 				--_inx;
 			}
-			execution_started = state; 
+			execution_started = state;
 		}
 		bool used() const { return execution_started; }
 
@@ -373,7 +373,7 @@ namespace sqlite {
 				Values&&...      values
 		);
 	}
-	
+
 	enum class OpenFlags {
 		READONLY = SQLITE_OPEN_READONLY,
 		READWRITE = SQLITE_OPEN_READWRITE,
@@ -449,6 +449,10 @@ namespace sqlite {
 			return sqlite3_last_insert_rowid(_db.get());
 		}
 
+		sqlite3_int64 rows_modified() const {
+    	return sqlite3_changes(_db.get());
+		}
+
 		template <typename Function>
 		void define(const std::string &name, Function&& func) {
 			typedef utility::function_traits<Function> traits;

tests/simple_examples.cc

@@ -27,9 +27,21 @@ int main()
 		std::string sql("select 1+1");
 		long test = 0;
 		db << sql >> test;
-		
+
 		if(test != 2) exit(EXIT_FAILURE);
-		
+
+		db <<"UPDATE foo SET b=? WHERE a=?;"<<"hi" << 1L ;
+		db << "SELECT b from foo where a=?;" << 1L >> str;
+		if(str != "hi")
+		{
+			cout << "Bad result on line "  << __LINE__ << endl;
+			exit(EXIT_FAILURE);
+		}
+		if(db.rows_modified()!=1) exit(EXIT_FAILURE);
+
+		db <<"UPDATE foo SET b=?;"<<"hello world" ;
+		if(db.rows_modified()!=2) exit(EXIT_FAILURE);
+
 	}
 	catch(sqlite_exception e)
 	{