hibernate - Grails CriteriaBuilder 添加限制

Question

我想创建我的条件对象并添加一些依赖于其他属性的限制。

我尝试过类似的事情......

    long from, to;
    use(TimeCategory) {
        from = (1.month.ago).getTime() / 1000L
        to = (new Date()).getTime() / 1000L
    }

    def crit = Map.createCriteria()       

    // set date range
    crit.between("appear", from, to)

    // if testParam1 is present
    if (params.testParam1 && !(params.testParam1.equals("all") || params.testParam1.isEmpty())) {
        crit.eq("test1", testParam1)
    }

    // if testParam2 is present
    if (params.testParam2 && !(params.testParam2.equals("all") || params.testParam2.isEmpty())) {
        crit.eq("test2", testParam2)
    }

但是每次我收到 java.lang.IllegalArgumentException

此异常来自 HibernateCriteriaBuilder 类，其中 validateSimpleExpression 测试失败

/**
 * Creates a "between" Criterion based on the property name and specified lo and hi values
 * @param propertyName The property name
 * @param lo The low value
 * @param hi The high value
 * @return A Criterion instance
 */
public Object between(String propertyName, Object lo, Object hi) {
    if(!validateSimpleExpression()) {
        throwRuntimeException( new IllegalArgumentException("Call to [between] with propertyName ["+propertyName+"]  not allowed here."));
    }
    propertyName = calculatePropertyName(propertyName);
    return addToCriteria(Restrictions.between(propertyName, lo, hi));
}


private boolean validateSimpleExpression() {
    if(this.criteria == null) {
        return false;
    }
    return true;
}

知道如何动态添加一些限制吗？

Answer 1

您必须使用闭包并将其传递给条件，让我展示一些简单的示例:

def criteria = Map.createCriteria()   


Closure closure = {builder ->
   if(params.testParam1){
       builder.eq("test1", testParam1)
   }
   if(params.testParam2){
       builder.eq("test2", testParam2)
   }
   builder.beetwen("appear", from, to)
}

并且比:

 def result = criteria.list(){
    closure(criteria)        
 }