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Spring Aliasing

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kalena last edited by
What's the practical meaning of Spring aliasing?
```
<bean id="testDataSource" ... />
<alias name="testDataSource" alias="dataSource"/>
```
I mean, the bin can be treated both on his id and on his as. But why?
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carriann last edited by

Two bins with one name spring You can't. However, the first bin second can be closed with help alias♪ For example, you have two databases. One test and another industrial. You don't want to change the name of the fields in the bin every time you're tested. Here for help and comes. alias♪ Plus, change of name alias used to counteract. Things are rarely used, but still used.
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To pass multiple idsSimply add to the query stop that attribute several times!// Exemplo passando um queryParam com vários ids localhost:8080/tagsday/search?ids=1&ids=2&dataInicial=2018-09-27&dataFinal=2018-09-28 Note that "?ids=1&ids=2" appears this repetition is understood as an array(or List) by the method!About doubt to add OR the call of the CriteriaThere is a way to make an OR yes!!Here I created a method to return the predicates in OR form:protected Predicate[] orPredicates(CriteriaBuilder builder, List<Predicate> predicates) { List<Predicate> returnPredicate = new ArrayList<>(); if(predicates.size() > 0) { Predicate orPredicate = builder.or(predicates.toArray(new Predicate[predicates.size()])); returnPredicate.add(orPredicate); } return returnPredicate.toArray(new Predicate[returnPredicate.size()]); } and use as follows, instead of returning: return predicates.toArray(new Predicate[predicates.size()]); I return the method:return orPredicates(builder, predicates); .But what if you need to have some predicates with AND and others with OR?You must have realized that the previous solution will make ALL predicates stay with OR!! Because of this, when I want to include a part of the querie with OR and another with AND I make a "Local Predicate List" and add the return of the OR method to the mandatory predicates as follows:... // Predicados locais que devem ser do tipo OR List<Predicate> predicatesLocal = new ArrayList<>(); if(tagsDayFilter.getDataInicial() != null) { predicatesLocal.add( builder.greaterThanOrEqualTo(root.get("data_coleta"), tagsDayFilter.getDataInicial()) ); } if(tagsDayFilter.getDataFinal() != null) { predicatesLocal.add( builder.lessThanOrEqualTo(root.get("data_coleta"), tagsDayFilter.getDataFinal()) ); } Predicate pred = builder.or( orPredicates(builder, predicatesLocal) ); predicates.add(pred); ... In the end he assembles the predicate as it should be mounted!Final code of the method of restrictions:private Predicate[] criarRestricoes(List<Long> ids, TagsDayFilter tagsDayFilter, CriteriaBuilder builder, Root<TagsDay> root) { List<Predicate> predicates = new ArrayList<>(); if(ids.size() > 0) { for(int i = 0; i < ids.size(); i++) { //adiciona vários ids para consulta predicates.add(builder.equal(root.get("id"), ids.get(i))); } } // ----------------- PREDICADOS COM OR ----------------- // Predicados locais que devem ser do tipo OR List<Predicate> predicatesLocal = new ArrayList<>(); if(tagsDayFilter.getDataInicial() != null) { predicatesLocal.add( builder.greaterThanOrEqualTo(root.get("data_coleta"), tagsDayFilter.getDataInicial()) ); } if(tagsDayFilter.getDataFinal() != null) { predicatesLocal.add( builder.lessThanOrEqualTo(root.get("data_coleta"), tagsDayFilter.getDataFinal()) ); } Predicate pred = builder.or( orPredicates(builder, predicatesLocal) ); predicates.add(pred); // ----------------------------------------------------- return predicates.toArray(new Predicate[predicates.size()]); } This method will return a SQL similar to :SELECT TAG.id, TAG.data_coleta, TAG.tags_id, TAG.valor FROM tags_day TAG WHERE TAG.id = 1 AND TAG.id = 2 AND (TAG.data_coleta >= ? OR TAG.data_coleta <= ?)
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Spring Aliasing

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