自定義方法

Spring Data 的另一個強大功能，是根據方法名稱自動實現功能。

比如：你的方法名叫做：findByTitle，那么它就知道你是根據title查詢，然后自動幫你完成，無需寫實現類。

當然，方法名稱要符合一定的約定：

KeywordSampleElasticsearch Query String

And	findByNameAndPrice	{"bool" : {"must" : [ {"field" : {"name" : "?"}}, {"field" : {"price" : "?"}} ]}}
Or	findByNameOrPrice	{"bool" : {"should" : [ {"field" : {"name" : "?"}}, {"field" : {"price" : "?"}} ]}}
Is	findByName	{"bool" : {"must" : {"field" : {"name" : "?"}}}}
Not	findByNameNot	{"bool" : {"must_not" : {"field" : {"name" : "?"}}}}
Between	findByPriceBetween	{"bool" : {"must" : {"range" : {"price" : {"from" : ?,"to" : ?,"include_lower" : true,"include_upper" : true}}}}}
LessThanEqual	findByPriceLessThan	{"bool" : {"must" : {"range" : {"price" : {"from" : null,"to" : ?,"include_lower" : true,"include_upper" : true}}}}}
GreaterThanEqual	findByPriceGreaterThan	{"bool" : {"must" : {"range" : {"price" : {"from" : ?,"to" : null,"include_lower" : true,"include_upper" : true}}}}}
Before	findByPriceBefore	{"bool" : {"must" : {"range" : {"price" : {"from" : null,"to" : ?,"include_lower" : true,"include_upper" : true}}}}}
After	findByPriceAfter	{"bool" : {"must" : {"range" : {"price" : {"from" : ?,"to" : null,"include_lower" : true,"include_upper" : true}}}}}
Like	findByNameLike	{"bool" : {"must" : {"field" : {"name" : {"query" : "?*","analyze_wildcard" : true}}}}}
StartingWith	findByNameStartingWith	{"bool" : {"must" : {"field" : {"name" : {"query" : "?*","analyze_wildcard" : true}}}}}
EndingWith	findByNameEndingWith	{"bool" : {"must" : {"field" : {"name" : {"query" : "*?","analyze_wildcard" : true}}}}}
Contains/Containing	findByNameContaining	{"bool" : {"must" : {"field" : {"name" : {"query" : "**?**","analyze_wildcard" : true}}}}}
In	findByNameIn(Collection<String>names)	{"bool" : {"must" : {"bool" : {"should" : [ {"field" : {"name" : "?"}}, {"field" : {"name" : "?"}} ]}}}}
NotIn	findByNameNotIn(Collection<String>names)	{"bool" : {"must_not" : {"bool" : {"should" : {"field" : {"name" : "?"}}}}}}
Near	findByStoreNear	Not Supported Yet !
True	findByAvailableTrue	{"bool" : {"must" : {"field" : {"available" : true}}}}
False	findByAvailableFalse	{"bool" : {"must" : {"field" : {"available" : false}}}}
OrderBy	findByAvailableTrueOrderByNameDesc	{"sort" : [{ "name" : {"order" : "desc"} }],"bool" : {"must" : {"field" : {"available" : true}}}}

例如，我們來按照價格區間查詢，定義這樣的一個方法：

public interface ItemRepository extends ElasticsearchRepository<Item,Long> {/*** 根據價格區間查詢* @param price1* @param price2* @return*/List<Item> findByPriceBetween(double price1, double price2); }

然后添加一些測試數據：

@Test public void indexList() {List<Item> list = new ArrayList<>();list.add(new Item(1L, "小米手機7", "手機", "小米", 3299.00, "http://image.learn.com/13123.jpg"));list.add(new Item(2L, "堅果手機R1", "手機", "錘子", 3699.00, "http://image.learn.com/13123.jpg"));list.add(new Item(3L, "華為META10", "手機", "華為", 4499.00, "http://image.learn.com/13123.jpg"));list.add(new Item(4L, "小米Mix2S", "手機", "小米", 4299.00, "http://image.learn.com/13123.jpg"));list.add(new Item(5L, "榮耀V10", "手機", "華為", 2799.00, "http://image.learn.com/13123.jpg"));// 接收對象集合，實現批量新增itemRepository.saveAll(list); }

?

不需要寫實現類，然后我們直接去運行：

@Test public void queryByPriceBetween(){List<Item> list = this.itemRepository.findByPriceBetween(2000.00, 3500.00);for (Item item : list) {System.out.println("item = " + item);} }

雖然基本查詢和自定義方法已經很強大了，但是如果是復雜查詢（模糊、通配符、詞條查詢等）就顯得力不從心了。此時，我們只能使用原生查詢。

總結

以上是生活随笔為你收集整理的自定义方法的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。