如何在 MongoDB 中查找长度大于特定值的字符串?
mongodbdatabasebig data analytics更新于 2026/1/18 1:07:17
要在 MongoDB 中查找长度大于特定值的字符串，请使用 $where 运算符。语法如下:−
db.yourCollectionName.find({$where:'this.yourStringFieldName.length >
yourIntegerValue'}).pretty();
为了理解上述概念，让我们创建一个包含文档的集合。创建包含文档的集合的查询如下 −
> db.stringFieldLengthDemo.insertOne({"UserId":1,"UserName":"Adam Smith"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bb4b2386c62d05142a78")
}
> db.stringFieldLengthDemo.insertOne({"UserId":2,"UserName":"Carol Taylor"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bb562386c62d05142a79")
}
> db.stringFieldLengthDemo.insertOne({"UserId":3,"UserName":"James Brown"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bb5b2386c62d05142a7a")
}
> db.stringFieldLengthDemo.insertOne({"UserId":4,"UserName":"John Smith"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bb662386c62d05142a7b")
}
> db.stringFieldLengthDemo.insertOne({"UserId":5,"UserName":"David Miller"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bb892386c62d05142a7c")
}
> db.stringFieldLengthDemo.insertOne({"UserId":6,"UserName":"John Williams"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bbb02386c62d05142a7d")
}
> db.stringFieldLengthDemo.insertOne({"UserId":7,"UserName":"Chris Evans"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77bbd32386c62d05142a7e")
}
使用 find() 方法显示集合中的所有文档。查询如下 −
> db.stringFieldLengthDemo.find().pretty();
以下是输出 −
{
"_id" : ObjectId("5c77bb4b2386c62d05142a78"),
"UserId" : 1,
"UserName" : "Adam Smith"
}
{
"_id" : ObjectId("5c77bb562386c62d05142a79"),
"UserId" : 2,
"UserName" : "Carol Taylor"
}
{
"_id" : ObjectId("5c77bb5b2386c62d05142a7a"),
"UserId" : 3,
"UserName" : "James Brown"
}
{
"_id" : ObjectId("5c77bb662386c62d05142a7b"),
"UserId" : 4,
"UserName" : "John Smith"
}
{
"_id" : ObjectId("5c77bb892386c62d05142a7c"),
"UserId" : 5,
"UserName" : "David Miller"
}
{
"_id" : ObjectId("5c77bbb02386c62d05142a7d"),
"UserId" : 6,
"UserName" : "John Williams"
}
{
"_id" : ObjectId("5c77bbd32386c62d05142a7e"),
"UserId" : 7,
"UserName" : "Chris Evans"
}
这是在 MongoDB 中查找长度大于 11 的字符串的查询 −
> db.stringFieldLengthDemo.find({$where:'this.UserName.length >11'}).pretty();
以下是输出 −
{
"_id" : ObjectId("5c77bb562386c62d05142a79"),
"UserId" : 2,
"UserName" : "Carol Taylor"
}
{
"_id" : ObjectId("5c77bb892386c62d05142a7c"),
"UserId" : 5,
"UserName" : "David Miller"
}
{
"_id" : ObjectId("5c77bbb02386c62d05142a7d"),
"UserId" : 6,
"UserName" : "John Williams"
}
