Bug #15719 MYSQL_OPT_RECONNECT option is modified by mysql_real_connect

 - Move init of "reconnect" variable to mysql_init 
 - Add test case to mysql_client_test.


sql-common/client.c:
  Move initialisation of reconnect variable to mysql_init instead of doing it in mysql_real_connect.
tests/mysql_client_test.c:
  Add test to check that reconnect is not modified by a call to mysql_real_connect

sql-common/client.c

@@ -1456,6 +1456,24 @@ mysql_init(MYSQL *mysql)
 
   mysql->options.methods_to_use= MYSQL_OPT_GUESS_CONNECTION;
   mysql->options.report_data_truncation= TRUE;  /* default */
+
+  /*
+    By default we don't reconnect because it could silently corrupt data (after
+    reconnection you potentially lose table locks, user variables, session
+    variables (transactions but they are specifically dealt with in
+    mysql_reconnect()).
+    This is a change: < 5.0.3 mysql->reconnect was set to 1 by default.
+    How this change impacts existing apps:
+    - existing apps which relyed on the default will see a behaviour change;
+    they will have to set reconnect=1 after mysql_real_connect().
+    - existing apps which explicitely asked for reconnection (the only way they
+    could do it was by setting mysql.reconnect to 1 after mysql_real_connect())
+    will not see a behaviour change.
+    - existing apps which explicitely asked for no reconnection
+    (mysql.reconnect=0) will not see a behaviour change.
+  */
+  mysql->reconnect= 0;
+
   return mysql;
 }
 
@@ -1625,23 +1643,6 @@ CLI_MYSQL_REAL_CONNECT(MYSQL *mysql,const char *host, const char *user,
   if (!unix_socket)
     unix_socket=mysql->options.unix_socket;
 
-  /*
-    By default we don't reconnect because it could silently corrupt data (after
-    reconnection you potentially lose table locks, user variables, session
-    variables (transactions but they are specifically dealt with in
-    mysql_reconnect()).
-    This is a change: < 5.0.3 mysql->reconnect was set to 1 by default.
-    How this change impacts existing apps:
-    - existing apps which relyed on the default will see a behaviour change;
-    they will have to set reconnect=1 after mysql_real_connect().
-    - existing apps which explicitely asked for reconnection (the only way they
-    could do it was by setting mysql.reconnect to 1 after mysql_real_connect())
-    will not see a behaviour change.
-    - existing apps which explicitely asked for no reconnection
-    (mysql.reconnect=0) will not see a behaviour change.
-  */
-  mysql->reconnect= 0;
-
   mysql->server_status=SERVER_STATUS_AUTOCOMMIT;
 
   /*

tests/mysql_client_test.c

@@ -14598,7 +14598,6 @@ static void test_bug14845()
 static void test_bug15510()
 {
   MYSQL_STMT *stmt;
-  MYSQL_RES *res;
   int rc;
   const char *query= "select 1 from dual where 1/0";
 
@@ -14624,6 +14623,81 @@ static void test_bug15510()
   myquery(rc);
 }
 
+
+/* Test MYSQL_OPT_RECONNECT, Bug#15719 */
+
+static void test_opt_reconnect()
+{
+  MYSQL *lmysql;
+  my_bool my_true= TRUE;
+
+  myheader("test_opt_reconnect");
+
+  if (!(lmysql= mysql_init(NULL)))
+  {
+    myerror("mysql_init() failed");
+    exit(1);
+  }
+
+  if (!opt_silent)
+    fprintf(stdout, "reconnect before mysql_options: %d\n", lmysql->reconnect);
+  DIE_UNLESS(lmysql->reconnect == 0);
+
+  if (mysql_options(lmysql, MYSQL_OPT_RECONNECT, &my_true))
+  {
+    myerror("mysql_options failed: unknown option MYSQL_OPT_RECONNECT\n");
+    exit(1);
+  }
+
+  /* reconnect should be 1 */
+  if (!opt_silent)
+    fprintf(stdout, "reconnect after mysql_options: %d\n", lmysql->reconnect);
+  DIE_UNLESS(lmysql->reconnect == 1);
+
+  if (!(mysql_real_connect(lmysql, opt_host, opt_user,
+                           opt_password, current_db, opt_port,
+                           opt_unix_socket, 0)))
+  {
+    myerror("connection failed");
+    exit(1);
+  }
+
+  /* reconnect should still be 1 */
+  if (!opt_silent)
+    fprintf(stdout, "reconnect after mysql_real_connect: %d\n",
+	    lmysql->reconnect);
+  DIE_UNLESS(lmysql->reconnect == 1);
+
+  mysql_close(lmysql);
+
+  if (!(lmysql= mysql_init(NULL)))
+  {
+    myerror("mysql_init() failed");
+    exit(1);
+  }
+
+  if (!opt_silent)
+    fprintf(stdout, "reconnect before mysql_real_connect: %d\n", lmysql->reconnect);
+  DIE_UNLESS(lmysql->reconnect == 0);
+
+  if (!(mysql_real_connect(lmysql, opt_host, opt_user,
+                           opt_password, current_db, opt_port,
+                           opt_unix_socket, 0)))
+  {
+    myerror("connection failed");
+    exit(1);
+  }
+
+  /* reconnect should still be 0 */
+  if (!opt_silent)
+    fprintf(stdout, "reconnect after mysql_real_connect: %d\n",
+	    lmysql->reconnect);
+  DIE_UNLESS(lmysql->reconnect == 0);
+
+  mysql_close(lmysql);
+}
+
+
 /*
   Read and parse arguments and MySQL options from my.cnf
 */
@@ -14883,7 +14957,9 @@ static struct my_tests_st my_tests[]= {
   { "test_bug13488", test_bug13488 },
   { "test_bug13524", test_bug13524 },
   { "test_bug14845", test_bug14845 },
-  { "test_bug15510", test_bug15510},
+  { "test_bug15510", test_bug15510 },
+  { "test_opt_reconnect", test_opt_reconnect },
+
   { 0, 0 }
 };