如何查询类似于“ like”的MongoDB？
要实现类似于“like”的功能，请find()在MongoDB中与//一起使用。让我们创建一个包含文档的集合-
> db.demo686.insertOne({"FirstName":"Robert"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea55182a7e81adc6a0b395c")
}
> db.demo686.insertOne({"FirstName":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea55186a7e81adc6a0b395d")
}
> db.demo686.insertOne({"FirstName":"ROBERT"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea5518fa7e81adc6a0b395e")
}
> db.demo686.insertOne({"FirstName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea55195a7e81adc6a0b395f")
}
> db.demo686.insertOne({"FirstName":"robert"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea5519ba7e81adc6a0b3960")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo686.find();
这将产生以下输出-
{ "_id" : ObjectId("5ea55182a7e81adc6a0b395c"), "FirstName" : "Robert" }
{ "_id" : ObjectId("5ea55186a7e81adc6a0b395d"), "FirstName" : "John" }
{ "_id" : ObjectId("5ea5518fa7e81adc6a0b395e"), "FirstName" : "ROBERT" }
{ "_id" : ObjectId("5ea55195a7e81adc6a0b395f"), "FirstName" : "David" }
{ "_id" : ObjectId("5ea5519ba7e81adc6a0b3960"), "FirstName" : "robert" }以下是类似于“like”的查询-
> db.demo686.find({FirstName:/Robert/i});这将产生以下输出-
{ "_id" : ObjectId("5ea55182a7e81adc6a0b395c"), "FirstName" : "Robert" }
{ "_id" : ObjectId("5ea5518fa7e81adc6a0b395e"), "FirstName" : "ROBERT" }
{ "_id" : ObjectId("5ea5519ba7e81adc6a0b3960"), "FirstName" : "robert" }