Function get_default_db_collation

sql/sql_db.cc:415–433

*/

const CHARSET_INFO *get_default_db_collation(THD *thd, const char *db_name)
{
  HA_CREATE_INFO db_info;

  if (thd->db != NULL && strcmp(db_name, thd->db) == 0)
    return thd->db_charset;

  load_db_opt_by_name(thd, db_name, &db_info);

  /*
    NOTE: even if load_db_opt_by_name() fails,
    db_info.default_table_charset contains valid character set
    (collation_server). We should not fail if load_db_opt_by_name() fails,
    because it is valid case. If a database has been created just by
    "mkdir", it does not contain db.opt file, but it is valid database.
  */

  return db_info.default_table_charset;
}