Java Hibernate标准API和字段选择器？

在Hibernate中，我喜欢CriteriaAPI，但它似乎不允许您为特定的实体类指定特定的列。例如，给定下表：

log_entries
    id : PRIMARY KEY AUTO INCREMENT INTEGER
    timestamp : datetime
    log_level : varchar(25)
    originator : varchar(200)
    message : text

如何使用Criteria API编写以下SQL查询：

SELECT
    timestamp,
    log_level
FROM
    log_entries
WHERE
    timestamp > '2013-06-05 00:00:00'
    AND
    originator <> 'com.me.myapp.SomeObject'

选择
时间戳，
对数级
从…起
日志项
哪里
时间戳>'2013-06-05 00:00:00'
及
发起人'com.me.myapp.SomeObject'

您需要使用ProjectionList来获取特定的列记录，请按照以下步骤操作

Criteria criteria  = session.createCriteria(LogEntries.class);

//select columns
ProjectionList columns = Projections.projectionList();
columns.add(Projections.property("timestamp"));
columns.add(Projections.property("log_level"));
criteria.setProjection(columns);

//conditions
Criterion timestamp = Restrictions.gt("timestamp", "2013-06-05 00:00:00");
Criterion originator = Restrictions.not(Restrictions.eq("originator", "com.me.myapp.SomeObject"));
LogicalExpression condition = Restrictions.and(timestamp, originator);

criteria.add(condition);
List results = criteria.list();