我在使用CriteriaBuilder
和Predicates
正确分组查询时遇到问题。
我想创建一个可以生成如下内容的查询:
SELECT * from tableName where columnA = '1234' and (columnB Like '%33%' or columnB Like '%44%')
但我得到的(显然希望看到代码)是:
SELECT * from tableName where columnA = '1234' and columnB Like '%33%' or columnB Like '%44%'
与第一个查询不会产生相同的结果。
一直试图解决它,但这是我第一次使用criteriaBuilder和谓词。 这是代码:
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<Foo> criteriaQuery = builder.createQuery(Foo.class);
Root r = criteriaQuery.from(Foo.class);
Predicate predicate = builder.conjunction();
for(Map.Entry<String, String> entry : searchParams.entrySet()){
if((entry.getKey().equalsIgnoreCase("columnK") || entry.getKey().equalsIgnoreCase("columnY") ||
entry.getKey().equalsIgnoreCase("columnZ") || entry.getKey().equalsIgnoreCase("columnJ")) && !Strings.isNullOrEmpty(entry.getValue())){
predicate = builder.and(predicate,
builder.like(r.get(entry.getKey()),
String.format("%%%s%%", entry.getValue().toString())));
}
else if(entry.getKey().equalsIgnoreCase("theDate") && !Strings.isNullOrEmpty(entry.getValue())){
predicate = builder.and(predicate, builder.equal(r.get(entry.getKey()), entry.getValue()));
}
}
//here's where the problem is ... I realize I can use IN, but I also didn't get that to work
boolean isFirstDone = false;
for(String oneId: idStringList){
if(!isFirstDone) {
predicate = builder.and(predicate, builder.equal(r.get("acceptorId"), oneId));
isFirstDone = true;
}
else{
predicate = builder.or(predicate, builder.equal(r.get("acceptorId"), oneId));
}
}
criteriaQuery.where(predicate);
谢谢。
答案 0 :(得分:0)
好的,所以我在仔细阅读了这个答案之后就解决了这个问题https://stackoverflow.com/a/9323183/5038073解决方案并不是我所需要的,但它帮助了很多......
我创建了一个路径并将其与我的谓词结合起来。
以下是改变了:
此:
boolean isFirstDone = false;
for(String oneId: idStringList){
if(!isFirstDone) {
predicate = builder.and(predicate, builder.equal(r.get("acceptorId"), oneId));
isFirstDone = true;
}
else{
predicate = builder.or(predicate, builder.equal(r.get("acceptorId"), oneId));
}
}
成为:
Path<Object> path = r.get("acceptorId");
CriteriaBuilder.In<Object> in = builder.in(path);
for (String oneId: idStringList) {
in.value(oneId);
}
predicate = builder.and(predicate, in);
我解决的所有问题都非常简单。
希望这也有助于其他人!