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法律研究如何在 MongoDB 中使用“Not Like”运算符？
为此，在 MongoDB 中使用 $not 运算符。为了理解这个概念，让我们用文档创建一个集合。创建带有文档的集合的查询如下所示 -
> db.notLikeOperatorDemo.insertOne({"StudentName":"John Doe"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a29c393b406bd3df60dfc")
}
> db.notLikeOperatorDemo.insertOne({"StudentName":"John Smith"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a29cc93b406bd3df60dfd")
}
> db.notLikeOperatorDemo.insertOne({"StudentName":"John Taylor"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a29df93b406bd3df60dfe")
}
> db.notLikeOperatorDemo.insertOne({"StudentName":"Carol Taylor"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a2a1693b406bd3df60dff")
}
> db.notLikeOperatorDemo.insertOne({"StudentName":"David Miller"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a2a2693b406bd3df60e00")
}在集合中使用 find() 方法显示所有文档。查询如下所示 -
> db.notLikeOperatorDemo.find().pretty();
以下是输出 -
{ "_id" : ObjectId("5c8a29c393b406bd3df60dfc"), "StudentName" : "John Doe" }
{
"_id" : ObjectId("5c8a29cc93b406bd3df60dfd"),
"StudentName" : "John Smith"
}
{
"_id" : ObjectId("5c8a29df93b406bd3df60dfe"),
"StudentName" : "John Taylor"
}
{
"_id" : ObjectId("5c8a2a1693b406bd3df60dff"),
"StudentName" : "Carol Taylor"
}
{
"_id" : ObjectId("5c8a2a2693b406bd3df60e00"),
"StudentName" : "David Miller"
}以下是使用 MongoDB 中 NOT LIKE 运算符的查询 -
> db.notLikeOperatorDemo.find( { StudentName: { $not: /^John Taylor.*/ } } );以下是输出 -
{ "_id" : ObjectId("5c8a29c393b406bd3df60dfc"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5c8a29cc93b406bd3df60dfd"), "StudentName" : "John Smith" }
{ "_id" : ObjectId("5c8a2a1693b406bd3df60dff"), "StudentName" : "Carol Taylor" }
{ "_id" : ObjectId("5c8a2a2693b406bd3df60e00"), "StudentName" : "David Miller" }
You can use the following query also:
> db.notLikeOperatorDemo.find({StudentName: {$not: /John Taylor/}});
The following is the output:
{ "_id" : ObjectId("5c8a29c393b406bd3df60dfc"), "StudentName" : "John Doe" }
{ "_id" : ObjectId("5c8a29cc93b406bd3df60dfd"), "StudentName" : "John Smith" }
{ "_id" : ObjectId("5c8a2a1693b406bd3df60dff"), "StudentName" : "Carol Taylor" }
{ "_id" : ObjectId("5c8a2a2693b406bd3df60e00"), "StudentName" : "David Miller" }
更新于： 2019 年 7 月 30 日
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