Preserve MySQL connection failures across queries

src/lib/mysql-connector.cpp

@@ -226,8 +226,10 @@ DValue MySQL::query(String q)
 	}
 	if(!connection)
 	{
-		_preload_next_error_code = CR_UNKNOWN_ERROR;
-		statement_info = "mysql connection is not open";
+		if(_preload_next_error_code == 0)
+			_preload_next_error_code = CR_UNKNOWN_ERROR;
+		if(statement_info == "")
+			statement_info = "mysql connection is not open";
 		return(DValue());
 	}
 	_preload_next_error_code = mysql_query((MYSQL*)connection, q.c_str());

src/wasm/core.cpp

@@ -287,6 +287,14 @@ DValue MySQL::query(String q)
 		statement_info = "mysql positional ? placeholders are not supported; use named :name placeholders";
 		return(DValue());
 	}
+	if(!connection)
+	{
+		if(_preload_next_error_code == 0)
+			_preload_next_error_code = 2000;
+		if(statement_info == "")
+			statement_info = "mysql connection is not open";
+		return(DValue());
+	}
 	DValue request;
 	request["op"] = "query";
 	request["handle"] = (f64)(uintptr_t)connection;