1、Specification
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//查詢條件List
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List<Predicate> predicateList =
new ArrayList<Predicate>();
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Specification specification =
new Specification() {
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@Override
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public Predicate toPredicate(Root root, CriteriaQuery criteriaQuery, CriteriaBuilder criteriaBuilder) {
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//root即是Join<>內部第一個泛型的類型，意思就是用SkuProduct與Picture通過SkuProduct的pictures左聯
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Join<SkuProduct,Picture> skuProductPictureJoin = root.join(
"pictures",JoinType.INNER);
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//添加第1個查詢條件：SkuProduct的code等於skuProduct.getCode()，然后將這個criteriaBuilder的條件添加到predicateList
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predicateList.add(criteriaBuilder.equal(root.get(
"code"),skuProduct.getCode()));
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//添加第2個條件
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predicateList.add(criteriaBuilder.notEqual(skuProductPictureJoin.get(
"pictureType"),
0));
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//返回
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return criteriaBuilder.and(predicateList.toArray(
new Predicate[predicateList.size()]));
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}
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};
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//
重要說明：Specification不支持右連接！
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//Specification specification = new Specification() {
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// @Override
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// public Predicate toPredicate(Root root, CriteriaQuery criteriaQuery, CriteriaBuilder criteriaBuilder) {
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// Join<Picture,SkuProduct> skuProductPictureJoin = root.join("pictures",JoinType.RIGHT);
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// predicateList.add(criteriaBuilder.notEqual(root.get("pictureType"),0));
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// predicateList.add(criteriaBuilder.equal(skuProductPictureJoin.get("code"),skuProduct.getCode()));
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// return criteriaBuilder.and(predicateList.toArray(new Predicate[predicateList.size()]));
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// }
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//};
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List<SkuProduct> results = skuProductRepository.findAll(specification);
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if(results!=
null){
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results.stream().forEach(result->{
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System.out.println(result);
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});
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}
2、HQL
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@Query(value =
"SELECT p FROM Picture p WHERE p.code= :code")
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List<Picture> findByPicture(@Param(value = "code") String code);
3、SQL
3.1--:占位符
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@Query(value =
"SELECT p.* FROM picture p LEFT JOIN sku_product_pictures sp_p ON p.id=sp_p.pictures_id LEFT JOIN sku_product sp ON sp_p.sku_product_id=sp.id WHERE sp.code= :code AND p.picture_type=0",nativeQuery =
true)
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List<Picture> findBySkuProductCodeAndPicture(@Param(value = "code") String code);
3.2--?占位符
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@Query(value =
"SELECT p.* FROM picture p LEFT JOIN sku_product_pictures sp_p ON p.id=sp_p.pictures_id LEFT JOIN sku_product sp ON sp_p.sku_product_id=sp.id WHERE sp.code=?1 AND p.picture_type=?2",nativeQuery =
true)
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List<Picture> findSkuProductCodeAndPicture(String code,int pictureType);
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