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這篇文章主要介紹了MongoDB模糊查詢操作的示例分析,具有一定借鑒價(jià)值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
1.作用與語(yǔ)法描述
作用: 正則表達(dá)式是使用指定字符串來(lái)描述、匹配一系列符合某個(gè)句法規(guī)則的字符串。許多程序設(shè)計(jì)語(yǔ)言都支持利用正則表達(dá)式進(jìn)行字符串操作。MongoDB 使用 $regex 操作符來(lái)設(shè)置匹配字符串的正則表達(dá)式。
語(yǔ)法一
{ <field>: { $regex: /pattern/, $options: '<options>' } } { <field>: { $regex: 'pattern', $options: '<options>' } } { <field>: { $regex: /pattern/<options> } }
語(yǔ)法二
{ <field>: /pattern/<options> }
2.案例演示
假設(shè)MongoDB中存放了我們OrderService服務(wù)的消息信息,其數(shù)據(jù)如下:
(以下為演示所用到的9個(gè)文檔)
{ "_id" : ObjectId("5d305b1c4857fc49c0c14c81"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b3b4857fc49c0c14c82"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b404857fc49c0c14c83"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b454857fc49c0c14c84"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b4b4857fc49c0c14c85"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b4f4857fc49c0c14c86"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305bb74857fc49c0c14c87"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"shenzheng\\\" origincode=\\\"QQ0003\\\" /></Body></Response>\"" }, { "_id" : ObjectId("5d305bd14857fc49c0c14c88"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"zhongshan\\\" origincode=\\\"QQ0002\\\" /></Body></Response>\"" }, { "_id" : ObjectId("5d305be94857fc49c0c14c89"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"zhongshan\\\" origincode=\\\"QQ0001\\\" /></Body></Response>\"" }
需求: 查詢 data 字段 含有 字符 <Head>OK</Head>的文檔
執(zhí)行代碼如下:
db.dbtestregex.find({data:{ $regex:/<Head>OK<\/Head>/}})
查詢代碼中的 \ 為轉(zhuǎn)移符,以下查詢語(yǔ)句也是如此。
返回結(jié)果如下:
{ "_id" : ObjectId("5d305bb74857fc49c0c14c87"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"shenzheng\\\" origincode=\\\"QQ0003\\\" /></Body></Response>\"" }, { "_id" : ObjectId("5d305bd14857fc49c0c14c88"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"zhongshan\\\" origincode=\\\"QQ0002\\\" /></Body></Response>\"" }, { "_id" : ObjectId("5d305be94857fc49c0c14c89"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"zhongshan\\\" origincode=\\\"QQ0001\\\" /></Body></Response>\"" }
上面的查詢命令也可以改寫(xiě)成:
db.dbtestregex.find({data:/<Head>OK<\/Head>/})
其查詢結(jié)果是一樣的,如下:
{ "_id" : ObjectId("5d305bb74857fc49c0c14c87"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"shenzheng\\\" origincode=\\\"QQ0003\\\" /></Body></Response>\"" }, { "_id" : ObjectId("5d305bd14857fc49c0c14c88"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"zhongshan\\\" origincode=\\\"QQ0002\\\" /></Body></Response>\"" }, { "_id" : ObjectId("5d305be94857fc49c0c14c89"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>OK</Head><Body><OrderResponse filter_mmm=\\\"2\\\" destcity=\\\"zhongshan\\\" origincode=\\\"QQ0001\\\" /></Body></Response>\"" }
還可以寫(xiě)成:
db.dbtestregex.find({data:{ $regex:'<Head>OK<\/Head>'}})
其實(shí)現(xiàn)功能一樣。
3.類關(guān)系型數(shù)據(jù)庫(kù)中的 not like 功能實(shí)現(xiàn)
反向查詢雖然不常見(jiàn),但也是我們DBA必須的。下面我們做一個(gè)案例演示,看看在MongoDB中,怎么實(shí)現(xiàn)not like 功能的查詢。
需求 查詢data 字段中不含 <Head>OK</Head>的文檔
執(zhí)行腳本如下:
db.dbtestregex.find({data:{ $not: /<Head>OK<\/Head>/ }})
返回的文檔如下;
{ "_id" : ObjectId("5d305b1c4857fc49c0c14c81"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b3b4857fc49c0c14c82"), "order" : "QQ00001", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b404857fc49c0c14c83"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b454857fc49c0c14c84"), "order" : "QQ00002", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b4b4857fc49c0c14c85"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }, { "_id" : ObjectId("5d305b4f4857fc49c0c14c86"), "order" : "QQ00003", "data" : "\"<?xml version='1.0' encoding='UTF-8'?><Response service=\\\"OrderService\\\"><Head>ERR</Head><ERROR>重復(fù)下單</ERROR></Response>\"" }
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