A fix and a test case for Bug#11183 "mysql_stmt_reset() doesn't reset

information about error".

libmysql/libmysql.c

@@ -1834,6 +1834,17 @@ static void net_clear_error(NET *net)
   }
 }
 
+
+static void stmt_clear_error(MYSQL_STMT *stmt)
+{
+  if (stmt->last_errno)
+  {
+    stmt->last_errno= 0;
+    stmt->last_error[0]= '\0';
+    strmov(stmt->sqlstate, not_error_sqlstate);
+  }
+}
+
 /*
   Set statement error code, sqlstate, and error message
   from given errcode and sqlstate.
@@ -4625,6 +4636,7 @@ my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
        param < param_end;
        param++)
     param->long_data_used= 0;
+  stmt_clear_error(stmt);
 
   DBUG_RETURN(0);
 }

tests/mysql_client_test.c

@@ -11697,6 +11697,50 @@ static void test_bug9735()
   myquery(rc);
 }
 
+/* Bug#11183 "mysql_stmt_reset() doesn't reset information about error" */
+
+static void test_bug11183()
+{
+  int rc;
+  MYSQL_STMT *stmt;
+  char bug_statement[]= "insert into t1 values (1)";
+
+  myheader("test_bug11183");
+
+  mysql_query(mysql, "drop table t1 if exists");
+  mysql_query(mysql, "create table t1 (a int)");
+
+  stmt= mysql_stmt_init(mysql);
+  DIE_UNLESS(stmt != 0);
+
+  rc= mysql_stmt_prepare(stmt, bug_statement, strlen(bug_statement));
+  check_execute(stmt, rc);
+
+  rc= mysql_query(mysql, "drop table t1");
+  myquery(rc);
+
+  /* Trying to execute statement that should fail on execute stage */
+  rc= mysql_stmt_execute(stmt);
+  DIE_UNLESS(rc);
+
+  mysql_stmt_reset(stmt);
+  DIE_UNLESS(mysql_stmt_errno(stmt) == 0);
+
+  mysql_query(mysql, "create table t1 (a int)");
+
+  /* Trying to execute statement that should pass ok */
+  if (mysql_stmt_execute(stmt))
+  {
+    mysql_stmt_reset(stmt);
+    DIE_UNLESS(mysql_stmt_errno(stmt) == 0);
+  }
+
+  mysql_stmt_close(stmt);
+
+  rc= mysql_query(mysql, "drop table t1");
+  myquery(rc);
+}
+
 
 /*
   Read and parse arguments and MySQL options from my.cnf
@@ -11913,6 +11957,7 @@ static struct my_tests_st my_tests[]= {
   { "test_bug7990", test_bug7990 },
   { "test_bug8378", test_bug8378 },
   { "test_bug9735", test_bug9735 },
+  { "test_bug11183", test_bug11183 },
   { 0, 0 }
 };