为什么对数据库的hibernate请求返回null？

Question

我遵循DAO方法：

@Override
    public Company getCompanyById(Long companyId) {
        Session session = sessionFactory.getCurrentSession();
        Criteria criteria = session.createCriteria(Company.class).add(
                Restrictions.eq("companyId", companyId));
        return (Company) criteria.uniqueResult();
    }

我将2L传递给此功能。但是作为返回值获取null，尽管在数据库中存在具有以下id的条目。

同样在调试中我试着评估以下表达式：

sessionFactory.getCurrentSession().createSQLQuery("select * from Company")

结果：

SQLQueryImpl(select * from Company):
    queryReturns = {java.util.ArrayList@7974} size = 0
    querySpaces = null
    callable = false
    autodiscovertypes = false
    queryString = {java.lang.String@7967}"select * from Company"
    session = {org.hibernate.impl.SessionImpl@5735}"SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=[] updates=[] deletions=[] collectionCreations=[] collectionRemovals=[] collectionUpdates=[]])"
    parameterMetadata = {org.hibernate.engine.query.ParameterMetadata@7975}
    values = {java.util.ArrayList@7976} size = 0
    types = {java.util.ArrayList@7977} size = 0
    namedParameters = {java.util.HashMap@7978} size = 0
    namedParameterLists = {java.util.HashMap@7979} size = 0
    optionalObject = null
    optionalId = null
    optionalEntityName = null
    selection = {org.hibernate.engine.RowSelection@7980}
    cacheable = false
    cacheRegion = null
    comment = {java.lang.String@7981}"dynamic native SQL query"
    flushMode = null
    cacheMode = null
    sessionFlushMode = null
    sessionCacheMode = null
    collectionKey = null
    readOnly = false
    resultTransformer = null

看起来像空的结果。

尝试从数据库执行它：

请帮助找出错误。