Disable cache outside transactions

Author: tylerkaraszewski

sqlitecluster/SQLite.cpp

@@ -511,7 +511,7 @@ bool SQLite::read(const string& query, SQResult& result, bool skipInfoWarn) cons
     } else {
         _isDeterministicQuery = true;
         queryResult = !SQuery(_db, "read only query", query, result, 2000 * STIME_US_PER_MS, skipInfoWarn);
-        if (_isDeterministicQuery && queryResult) {
+        if (_isDeterministicQuery && queryResult && insideTransaction()) {
             _queryCache.emplace(make_pair(query, result));
         }
     }

sqlitecluster/SQLite.h

@@ -216,7 +216,7 @@ class SQLite {
     const string getMostRecentSQLiteErrorLog() const;
 
     // Returns true if we're inside an uncommitted transaction.
-    bool insideTransaction() { return _insideTransaction; }
+    bool insideTransaction() const { return _insideTransaction; }
 
     // Looks up the exact SQL of a paricular commit to the database, as well as gets the SHA1 hash of the database
     // immediately following tha commit.