Question

我刚接触冬眠我想用标准来调用我的自定义函数简单地说，我想调用这样的函数：
SELECT * FROM table WHERE test=1 ORDER BY my_own_function(arg1, arg2) asc
使用HQL可以解决这个问题但我有许多可选条件，所以我必须动态附加条件。
反正有没有解决这个问题？如果没有，你能告诉我其他方法吗？

Answer 1

由于评论只支持一条线，我在这里贴出我的解决方案， 1.延长订单，链接为extend Order

package ro.tremend.util.hibernate;

import org.hibernate.criterion.Order;
import org.hibernate.criterion.CriteriaQuery;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;

/**
 * Extends {@link org.hibernate.criterion.Order} to allow ordering by an SQL formula      passed by the user.
 * Is simply appends the <code>sqlFormula</code> passed by the user to the resulting SQL query, without any verification.
 * @author Sorin Postelnicu
 * @since Jun 10, 2008
 */
  public class OrderBySqlFormula extends Order {
private String sqlFormula;

/**
 * Constructor for Order.
 * @param sqlFormula an SQL formula that will be appended to the resulting SQL query
 */
protected OrderBySqlFormula(String sqlFormula) {
    super(sqlFormula, true);
    this.sqlFormula = sqlFormula;
}

public String toString() {
    return sqlFormula;
}

public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
    return sqlFormula;
}

/**
 * Custom order
 *
 * @param sqlFormula an SQL formula that will be appended to the resulting SQL query
 * @return Order
 */
public static Order sqlFormula(String sqlFormula) {
    return new OrderBySqlFormula(sqlFormula);
}

}

使用公式添加要订购的列 Use formula

带标准的Hibernate调用函数

1 个答案: