在 MongoDB 中检查某个字段是否包含字符串?
mongodbdatabasebig data analytics更新于 2026/1/17 17:52:17
您可以使用 $regex 运算符在 MongoDB 中检查某个字段是否包含字符串。语法如下:−
db.yourCollectionName.findOne({"yourFieldName":{$regex:".*yourValue.*"}});
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.checkFieldContainsStringDemo.insertOne({"Id":1,"Name":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77d762fc4e719b197a12ed")
}
> db.checkFieldContainsStringDemo.insertOne({"Id":2,"Name":"Johnson"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77d76bfc4e719b197a12ee")
}
> db.checkFieldContainsStringDemo.insertOne({"Id":3,"Name":"Carol"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77d774fc4e719b197a12ef")
}
> db.checkFieldContainsStringDemo.insertOne({"Id":4,"Name":"Mike"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77d77cfc4e719b197a12f0")
}
> db.checkFieldContainsStringDemo.insertOne({"Id":5,"Name":"Sam"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77d784fc4e719b197a12f1")
}
> db.checkFieldContainsStringDemo.insertOne({"Id":6,"Name":"Larry"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c77d78cfc4e719b197a12f2")
}
借助 find() 方法显示集合中的所有文档. 查询如下 −
> db.checkFieldContainsStringDemo.find();
以下是输出 −
{ "_id" : ObjectId("5c77d762fc4e719b197a12ed"), "Id" : 1, "Name" : "John" }
{ "_id" : ObjectId("5c77d76bfc4e719b197a12ee"), "Id" : 2, "Name" : "Johnson" }
{ "_id" : ObjectId("5c77d774fc4e719b197a12ef"), "Id" : 3, "Name" : "Carol" }
{ "_id" : ObjectId("5c77d77cfc4e719b197a12f0"), "Id" : 4, "Name" : "Mike" }
{ "_id" : ObjectId("5c77d784fc4e719b197a12f1"), "Id" : 5, "Name" : "Sam" }
{ "_id" : ObjectId("5c77d78cfc4e719b197a12f2"), "Id" : 6, "Name" : "Larry" }
以下查询用于检查 MongoDB 中字段是否包含特定字符串。此处，我们在字段中搜索的字符串是"Johnson"−
> db.checkFieldContainsStringDemo.findOne({"Name":{$regex:".*Johnson.*"}});
以下是输出 −
{
"_id" : ObjectId("5c77d76bfc4e719b197a12ee"),
"Id" : 2,
"Name" : "Johnson"
}
