Fixed bug #47485 - mysql_store_result returns a not NULL result set

for a prepared statement.

include/mysql.h:
  enumerator MYSQL_STATUS_STATEMENT_GET_RESULT was added
  into mysql_status enum.
include/mysql.h.pp:
  enumerator MYSQL_STATUS_STATEMENT_GET_RESULT was added
  into mysql_status enum.
libmysql/libmysql.c:
  Introduce a separate mysql state to distinguish the situation
  when we have a binary result set pending on the server from the
  situation when the result set is in text protocol.
  execute() modified: if mysql->status == MYSQL_STATUS_GET_RESULT
  before return then set it to value MYSQL_STATUS_STATEMENT_GET_RESULT.
  stmt_read_row_unbuffered() and mysql_stmt_store_result()
  were modified: added checking for mysql->status against
  MYSQL_STATUS_STATEMENT_GET_RESULT value instead of MYSQL_STATUS_GET_RESULT.
tests/mysql_client_test.c:
  added test_bug47485()

1 files changed, 4 insertions, 2 deletions

diff --git a/libmysql/libmysql.c b/libmysql/libmysql.c
index 362ad5de6c4..8c612b6894e 100644
--- a/libmysql/libmysql.c
+++ b/libmysql/libmysql.c
@@ -2503,6 +2503,8 @@ static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
       set_stmt_errmsg(stmt, net);
     DBUG_RETURN(1);
   }
+  else if (mysql->status == MYSQL_STATUS_GET_RESULT)
+    stmt->mysql->status= MYSQL_STATUS_STATEMENT_GET_RESULT;
   DBUG_RETURN(0);
 }
 
@@ -2641,7 +2643,7 @@ static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row)
     set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate, NULL);
     return 1;
   }
-  if (mysql->status != MYSQL_STATUS_GET_RESULT)
+  if (mysql->status != MYSQL_STATUS_STATEMENT_GET_RESULT)
   {
     set_stmt_error(stmt, stmt->unbuffered_fetch_cancelled ?
                    CR_FETCH_CANCELED : CR_COMMANDS_OUT_OF_SYNC,
@@ -4847,7 +4849,7 @@ int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
       DBUG_RETURN(1);
     }
   }
-  else if (mysql->status != MYSQL_STATUS_GET_RESULT)
+  else if (mysql->status != MYSQL_STATUS_STATEMENT_GET_RESULT)
   {
     set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate, NULL);
     DBUG_RETURN(1);