我想了解为什么我无法获得结果

Question

我查看了某人编写的代码，因为无法获得结果。代码不正确，但至少我希望public Language getLanguageByCode(String code) { Criteria criteria = getSession().createCriteria(Language.class); if (code.length() == 3) criteria = criteria.add(Restrictions.eq("threeCode", code.toUpperCase())); else if (code.length() == 2) criteria = criteria.add(Restrictions.eq("twoCode", code.toUpperCase())); else { throw new RuntimeException("code incorrect"); } criteria = criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); @SuppressWarnings("unchecked") List<Language> langList = criteria.list(); Language lang = null; if (langList.size() > 1) { LOG.error("Query result size is bigger than expected!"); lang = (Language) criteria.list().get(0); } else if (langList.size() == 1) { criteria.setFirstResult(0); criteria.setMaxResults(1); lang = (Language) criteria.uniqueResult(); } return lang; } 从数据库返回结果。在同一数据库上运行生成的SQL查询或按以下方式更正代码时，会得到结果。

我想了解为什么没有得到结果

代码不正确

    select

        this_.id as id23_0_,

        this_.three_code as three2_23_0_,

        this_.title as title23_0_,

        this_.two_code as two4_23_0_ 

    from

        language this_ 

    where

        this_.two_code=?

2019-06-12 16:12:15 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - EN

Hibernate生成的查询：

public Language getLanguageByCode(String code) {
    Criteria criteria = getSession().createCriteria(Language.class);
    if (code.length() == 3)
      criteria = criteria.add(Restrictions.eq("threeCode", code.toUpperCase()));
    else if (code.length() == 2)
      criteria = criteria.add(Restrictions.eq("twoCode", code.toUpperCase()));
    else {
      throw new RuntimeException("code incorrect");
    }
    criteria = criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
    @SuppressWarnings("unchecked")
    List<Language> langList = criteria.list();
    if (langList.size() == 0)
      return null;

    if (langList.size() > 1)
      LOG.error("Query result size is bigger than expected!");

    return langList.get(0);
  }

正确的密码

public class SqlManager{

    private AsyncSQLClient _sqlClient;
    public SqlManager(MySqlHelper sqlHelper, SqlSettings settings) {
        ConnectionConfig config = new ConnectionConfig(settings.Address, settings.Port,
                settings.Database, settings.User, settings.Password);
        _sqlClient = sqlHelper.getSqlConnection(config);
    }
}

public class MySqlHelper {

    private Vertx _vertx;

    public MySqlHelper(Vertx vertx) {
        _vertx = vertx;
    }

    public AsyncSQLClient getSqlConnection(ConnectionConfig config) {
        AsyncSQLClient sqlClient = MySQLClient.createNonShared(_vertx, config.get());
        return sqlClient;
    }

}