Spring / Hibernate Select Count（*）查詢自定義？

Question

請幫我，

這是給我正確行數的DAO，但我想添加一些條件。

@Override
public int getAllRows(SearchForm searchForm) {
    logger.info("SearchForm Detail :: " + searchForm);
    Session session = this.sessionFactory.getCurrentSession();
    Query query = (Query) session.createQuery(" select count(*) from EmployeeVO");
    int rows = ((Number) query.uniqueResult()).intValue();
    logger.info("Number of Rows :: " + rows);
    return rows;
}

這是我的MySQL查詢：

選擇名字

來自員工

WHERE first_name喜歡'％ab％'

AND薪水> 0且薪水<100000;

Answer 1

Query query = (Query) session.createQuery("SELECT first_name FROM employees WHERE first_name LIKE ? AND salary > ? and salary < ?");
query.setParameter(0, '%ab%');
query.setParameter(1, 0);
query.setParameter(2, 100000);

您還可以如下使用命名參數：

Query query = (Query) session.createQuery("SELECT first_name FROM employees WHERE first_name LIKE :first_name AND salary > :min_salary and salary < :max_salary");
query.setParameter(first_name, '%ab%');
query.setParameter(min_salary, 0);
query.setParameter(max_salary, 100000);

另一個替代方法是使用Hibernate Criteria API：

Criteria criteria = session.createCriteria(Employee.class);
criteria.add(Restrictions.eq("first_name", "%ab%"));
criteria.add(Restrictions.lt("salary ", 0));
criteria.add(Restrictions.gt("salary ", 100000));
List list = criteria.list();