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本篇文章給大家分享的是有關(guān)如何進(jìn)行MongoDB排除查詢$ne缺陷,小編覺得挺實(shí)用的,因此分享給大家學(xué)習(xí),希望大家閱讀完這篇文章后可以有所收獲,話不多說,跟著小編一起來看看吧。
最近學(xué)習(xí)MongoDB數(shù)據(jù)庫基本開發(fā)知識(shí),發(fā)現(xiàn)MongoDB的排除查$ne類似于Oracle的not in 或者not exists,
但是$ne只能對(duì)字符串鍵值對(duì)起作用而對(duì)數(shù)字類型不行,舉例如下:
示例數(shù)據(jù):
> dvd=({"Type":"DVD","Title":"Matrix,The","Released":1999,"Cast":["Keanu Reeeves","Carrie-Anne Moss","Laurence Fishburne","Hugo Weaving","Gloria Foster","Joe Pantoliano"]})
{
"Type" : "DVD",
"Title" : "Matrix,The",
"Released" : 1999,
"Cast" : [
"Keanu Reeeves",
"Carrie-Anne Moss",
"Laurence Fishburne",
"Hugo Weaving",
"Gloria Foster",
"Joe Pantoliano"
]
}
> db.media.insert(dvd)
WriteResult({ "nInserted" : 1 })
> dvd=({"Type":"DVD","Title":"Blade Runner","Released":1982})
{ "Type" : "DVD", "Title" : "Blade Runner", "Released" : 1982 }
> db.media.insert(dvd)
WriteResult({ "nInserted" : 1 })
> dvd=({"Type":"DVD","Title":"Toy Story 3","Released":2010})
{ "Type" : "DVD", "Title" : "Toy Story 3", "Released" : 2010 }
> db.media.insert(dvd)
WriteResult({ "nInserted" : 1 })
>
正常的字符串排除查詢,以示例數(shù)據(jù)中Title鍵進(jìn)行測(cè)試:
> db.media.find({"Type":"DVD","Title":{$ne:"Blade Runner"}})
{ "_id" : ObjectId("595af5ce39297105e4322fbd"), "Type" : "DVD", "Title" : "Matrix,The", "Released" : 1999, "Cast" : [ "Keanu Reeeves", "Carrie-Anne Moss", "Laurence Fishburne", "Hugo Weaving", "Gloria Foster", "Joe Pantoliano" ] }
{ "_id" : ObjectId("595af63239297105e4322fbf"), "Type" : "DVD", "Title" : "Toy Story 3", "Released" : 2010 }
>
對(duì)數(shù)字排除無效,以示例數(shù)據(jù)中Released鍵進(jìn)行測(cè)試:
> db.media.find({"Type":"DVD","Release":{$ne:"1999"}})
{ "_id" : ObjectId("595af5ce39297105e4322fbd"), "Type" : "DVD", "Title" : "Matrix,The", "Released" : 1999, "Cast" : [ "Keanu Reeeves", "Carrie-Anne Moss", "Laurence Fishburne", "Hugo Weaving", "Gloria Foster", "Joe Pantoliano" ] }
{ "_id" : ObjectId("595af61939297105e4322fbe"), "Type" : "DVD", "Title" : "Blade Runner", "Released" : 1982 }
{ "_id" : ObjectId("595af63239297105e4322fbf"), "Type" : "DVD", "Title" : "Toy Story 3", "Released" : 2010 }
>
> db.media.find({"Type":"DVD","Release":{$ne:1999}})
{ "_id" : ObjectId("595af5ce39297105e4322fbd"), "Type" : "DVD", "Title" : "Matrix,The", "Released" : 1999, "Cast" : [ "Keanu Reeeves", "Carrie-Anne Moss", "Laurence Fishburne", "Hugo Weaving", "Gloria Foster", "Joe Pantoliano" ] }
{ "_id" : ObjectId("595af61939297105e4322fbe"), "Type" : "DVD", "Title" : "Blade Runner", "Released" : 1982 }
{ "_id" : ObjectId("595af63239297105e4322fbf"), "Type" : "DVD", "Title" : "Toy Story 3", "Released" : 2010 }
>
實(shí)驗(yàn)結(jié)果:mongodb的$ne操作只能對(duì)字符串鍵值對(duì)發(fā)揮作用。
本次實(shí)驗(yàn)的MongoDB數(shù)據(jù)庫版本是:3.2.7
以上就是如何進(jìn)行MongoDB排除查詢$ne缺陷,小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘9ぷ鲿?huì)見到或用到的。希望你能通過這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注億速云行業(yè)資訊頻道。
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