Added variable enforce_autocommit_on_reads

Just the variable for now

include/MySQL_Thread.h

@@ -283,6 +283,7 @@ class MySQL_Threads_Handler
 		bool have_compress;
 		bool client_found_rows;
 		bool multiplexing;
+		bool enforce_autocommit_on_reads;
 		int max_transaction_time;
 		int threshold_query_length;
 		int threshold_resultset_size;

include/proxysql_structs.h

@@ -712,6 +712,7 @@ __thread int mysql_thread___poll_timeout_on_failure;
 __thread bool mysql_thread___have_compress;
 __thread bool mysql_thread___client_found_rows;
 __thread bool mysql_thread___multiplexing;
+__thread bool mysql_thread___enforce_autocommit_on_reads;
 __thread bool mysql_thread___servers_stats;
 __thread bool mysql_thread___commands_stats;
 __thread bool mysql_thread___query_digests;
@@ -776,6 +777,7 @@ extern __thread int mysql_thread___poll_timeout_on_failure;
 extern __thread bool mysql_thread___have_compress;
 extern __thread bool mysql_thread___client_found_rows;
 extern __thread bool mysql_thread___multiplexing;
+extern __thread bool mysql_thread___enforce_autocommit_on_reads;
 extern __thread bool mysql_thread___servers_stats;
 extern __thread bool mysql_thread___commands_stats;
 extern __thread bool mysql_thread___query_digests;

lib/MySQL_Thread.cpp

@@ -167,6 +167,7 @@ static char * mysql_thread_variables_names[]= {
 	(char *)"monitor_writer_is_also_reader",
 	(char *)"max_transaction_time",
 	(char *)"multiplexing",
+	(char *)"enforce_autocommit_on_reads",
 	(char *)"threshold_query_length",
 	(char *)"threshold_resultset_size",
 	(char *)"wait_timeout",
@@ -256,6 +257,7 @@ MySQL_Threads_Handler::MySQL_Threads_Handler() {
 	variables.client_found_rows=true;
 	variables.commands_stats=true;
 	variables.multiplexing=true;
+	variables.enforce_autocommit_on_reads=false;
 	variables.query_digests=true;
 	variables.sessions_sort=true;
 	variables.servers_stats=true;
@@ -403,6 +405,7 @@ int MySQL_Threads_Handler::get_variable_int(char *name) {
 	if (!strcasecmp(name,"have_compress")) return (int)variables.have_compress;
 	if (!strcasecmp(name,"client_found_rows")) return (int)variables.client_found_rows;
 	if (!strcasecmp(name,"multiplexing")) return (int)variables.multiplexing;
+	if (!strcasecmp(name,"enforce_autocommit_on_reads")) return (int)variables.enforce_autocommit_on_reads;
 	if (!strcasecmp(name,"commands_stats")) return (int)variables.commands_stats;
 	if (!strcasecmp(name,"query_digests")) return (int)variables.query_digests;
 	if (!strcasecmp(name,"sessions_sort")) return (int)variables.sessions_sort;
@@ -594,6 +597,9 @@ char * MySQL_Threads_Handler::get_variable(char *name) {	// this is the public f
 	if (!strcasecmp(name,"multiplexing")) {
 		return strdup((variables.multiplexing ? "true" : "false"));
 	}
+	if (!strcasecmp(name,"enforce_autocommit_on_reads")) {
+		return strdup((variables.enforce_autocommit_on_reads ? "true" : "false"));
+	}
 	if (!strcasecmp(name,"commands_stats")) {
 		return strdup((variables.commands_stats ? "true" : "false"));
 	}
@@ -1088,6 +1094,17 @@ bool MySQL_Threads_Handler::set_variable(char *name, char *value) {	// this is t
 		}
 		return false;
 	}
+	if (!strcasecmp(name,"enforce_autocommit_on_reads")) {
+		if (strcasecmp(value,"true")==0 || strcasecmp(value,"1")==0) {
+			variables.enforce_autocommit_on_reads=true;
+			return true;
+		}
+		if (strcasecmp(value,"false")==0 || strcasecmp(value,"0")==0) {
+			variables.enforce_autocommit_on_reads=false;
+			return true;
+		}
+		return false;
+	}
 	if (!strcasecmp(name,"commands_stats")) {
 		if (strcasecmp(value,"true")==0 || strcasecmp(value,"1")==0) {
 			variables.commands_stats=true;
@@ -1801,6 +1818,7 @@ void MySQL_Thread::refresh_variables() {
 	mysql_thread___have_compress=(bool)GloMTH->get_variable_int((char *)"have_compress");
 	mysql_thread___client_found_rows=(bool)GloMTH->get_variable_int((char *)"client_found_rows");
 	mysql_thread___multiplexing=(bool)GloMTH->get_variable_int((char *)"multiplexing");
+	mysql_thread___enforce_autocommit_on_reads=(bool)GloMTH->get_variable_int((char *)"enforce_autocommit_on_reads");
 	mysql_thread___commands_stats=(bool)GloMTH->get_variable_int((char *)"commands_stats");
 	mysql_thread___query_digests=(bool)GloMTH->get_variable_int((char *)"query_digests");
 	mysql_thread___sessions_sort=(bool)GloMTH->get_variable_int((char *)"sessions_sort");