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法律研究MongoDB 查询布尔字段为 “not true”
对于这一点， يمكنك使用 $ne（不等于）运算符。语法如下所示 −
db.yourCollectionName.find({yourFieldName: {$ne: true}}).pretty();为了理解上述语法，让我们创建一个包含文档的集合。用于创建包含文档的集合的查询如下所示 −
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Larry","EmployeeAge":24,"isOldEmployee":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7f7680f10143d8431e13")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Mike","EmployeeAge":20,"isOldEmployee":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7f8680f10143d8431e14")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Sam","EmployeeAge":23,"isOldEmployee":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7f9380f10143d8431e15")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"David","EmployeeAge":25,"isOldEmployee":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7fa280f10143d8431e16")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Carol","EmployeeAge":27,"isOldEmployee":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7fae80f10143d8431e17")
}在集合中使用 find() 方法显示所有文档。该查询如下所示 −
> db.queryForBooleanFieldsDemo.find().pretty();
以下是输出 −
{
"_id" : ObjectId("5c8b7f7680f10143d8431e13"),
"EmployeeName" : "Larry",
"EmployeeAge" : 24,
"isOldEmployee" : true
}
{
"_id" : ObjectId("5c8b7f8680f10143d8431e14"),
"EmployeeName" : "Mike",
"EmployeeAge" : 20,
"isOldEmployee" : false
}
{
"_id" : ObjectId("5c8b7f9380f10143d8431e15"),
"EmployeeName" : "Sam",
"EmployeeAge" : 23,
"isOldEmployee" : false
}
{
"_id" : ObjectId("5c8b7fa280f10143d8431e16"),
"EmployeeName" : "David",
"EmployeeAge" : 25,
"isOldEmployee" : true
}
{
"_id" : ObjectId("5c8b7fae80f10143d8431e17"),
"EmployeeName" : "Carol",
"EmployeeAge" : 27,
"isOldEmployee" : true
}以下是布尔字段为 “not true” 的查询 −
> db.queryForBooleanFieldsDemo.find({isOldEmployee: {$ne: true}}).pretty();以下是输出 −
{
"_id" : ObjectId("5c8b7f8680f10143d8431e14"),
"EmployeeName" : "Mike",
"EmployeeAge" : 20,
"isOldEmployee" : false
}
{
"_id" : ObjectId("5c8b7f9380f10143d8431e15"),
"EmployeeName" : "Sam",
"EmployeeAge" : 23,
"isOldEmployee" : false
}
更新于： 30-07-2019
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