Fix

Author: ZorTik

asql-core/src/main/java/me/zort/sqllib/mapping/DefaultStatementMapping.java

@@ -77,7 +77,8 @@ public QueryResult executeQuery(StatementMappingOptions options, Method method,
         return ((SQLDatabaseConnection) connection).exec(node);
       }
     } finally {
-      if (connection instanceof PooledSQLDatabaseConnection) {
+      if (connection instanceof PooledSQLDatabaseConnection
+        && ((PooledSQLDatabaseConnection) connection).isPoolAssigned()) {
         ((PooledSQLDatabaseConnection) connection).close();
       }
     }

asql-core/src/main/java/me/zort/sqllib/pool/PooledSQLDatabaseConnection.java

@@ -27,6 +27,10 @@ protected void setLastUsed(long lastUsed) {
     this.lastUsed = lastUsed;
   }
 
+  public boolean isPoolAssigned() {
+    return assignedPool != null;
+  }
+
   /**
    * The close() method in this class checks if there is any assigned
    * pool (most commonly when this instance is part of a pool) and optionally