Spring 開機添加條件查詢

Question

當交易類型為費率 $ 時，它不會搜索/獲取，但當交易類型為費率 % 時，它正在工作。

if(promotionInput.getDealType() != null) {
            query.addCriteria(Criteria.where(PromotionMasterConstants.DEAL_TYPE_DB).regex(promotionInput.getDealType(),"i"));
        }

我沒有收到錯誤。

Answer 1

您正在提供沒有 escaping 特殊正則表達式字符的正則表達式模式（在這種情況下為promotionInput.getDealType() ）。

特殊的正則表達式元字符： ., +, *, ?, ^, $, (, ), [, ], {, }, |, \.

在您的情況下， promotionInput.getDealType()包含未轉義的美元符號，您應該在提供正則表達式搜索之前對其進行轉義。

如果美元符號 ($) 位於整個正則表達式的末尾，則它匹配行尾。

如果整個正則表達式由插入符號和美元符號（^like this$）括起來，它匹配整行。

if(promotionInput.getDealType() != null) {

   // maybe check for other metacharacters?
   String escapedDealType = promotionInput.getDealType().replace("$", "\\$");

   query.addCriteria(Criteria.where(PromotionMasterConstants.DEAL_TYPE_DB)
                    .regex(escapedDealType,"i"));
}

MongoDB 中的數據

rs0:PRIMARY> db.promotion.find()
        { "_id" : ObjectId("6034bbfee56ebe09e8821e44"), "value" : "Rate $", "_class" : "com.xyz.model.Promotion" }
        { "_id" : ObjectId("6034bbfee56ebe09e8821e45"), "value" : "Rate %", "_class" : "com.xyz.model.Promotion" }

測試：使用正則表達式搜索值

測試已成功執行並呈綠色。

@Test
    public void name() {

        // drop everything
        mongoTemplate.dropCollection(Promotion.class);

        // persist entity with value field equls to "Rate $"
        final Promotion promotion = new Promotion();
        promotion.setValue("Rate $");
        mongoTemplate.insert(promotion);

        // persist entity with value field equls to "Rate %"
        final Promotion promotion2 = new Promotion();
        promotion2.setValue("Rate %");
        mongoTemplate.insert(promotion2);

        // RETURNS EMPTY COLLECTION
        Query query = new Query();
        query.addCriteria(Criteria.where("value").regex("Rate $", "i"));
        List<Promotion> promotions = mongoTemplate.find(query, Promotion.class);
        assertThat(promotions.size(), is(0));

        // query with escaped $
        // FINDS THE RECORD SUCCESSFULLY
        Query query2 = new Query();
        query2.addCriteria(Criteria.where("value").regex("Rate \\$", "i"));
        promotions = mongoTemplate.find(query2, Promotion.class);
        assertThat(promotions.size(), is(1));
        assertThat(promotions.get(0).getValue(), is("Rate $"));
    }

Answer 2

if(promotionInput.getDealType() != null) {

query.addCriteria(Criteria.where(PromotionMasterConstants.DEAL_TYPE_DB).regex(promotionInput.getDealType().replace("$", "\$"),"i")); }

這將需要費率 $