MongoDB正则表达式以获取具有特定名称“ John”而不是“ john”的记录
要搜索特定单词，请使用/searchWord/和正则表达式。让我们创建一个包含文档的集合-
> db.demo221.insertOne({"Details":{"StudentName":"Chris","StudentAge":21}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3ee15d03d395bdc213472b")
}
> db.demo221.insertOne({"Details":{"StudentName":"John","StudentAge":20}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3ee16503d395bdc213472c")
}
> db.demo221.insertOne({"Details":{"StudentName":"Bob","StudentAge":22}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3ee16b03d395bdc213472d")
}
> db.demo221.insertOne({"Details":{"StudentName":"john","StudentAge":24}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3ee17303d395bdc213472e")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo221.find();
这将产生以下输出-
{ "_id" : ObjectId("5e3ee15d03d395bdc213472b"), "Details" : { "StudentName" : "Chris", "StudentAge" : 21 } }
{ "_id" : ObjectId("5e3ee16503d395bdc213472c"), "Details" : { "StudentName" : "John", "StudentAge" : 20 } }
{ "_id" : ObjectId("5e3ee16b03d395bdc213472d"), "Details" : { "StudentName" : "Bob", "StudentAge" : 22 } }
{ "_id" : ObjectId("5e3ee17303d395bdc213472e"), "Details" : { "StudentName" : "john", "StudentAge" : 24 } }以下是查询以获取名称为“John”的特定记录的查询-
> db.demo221.find({"Details.StudentName":/John/});这将产生以下输出-
{ "_id" : ObjectId("5e3ee16503d395bdc213472c"), "Details" : { "StudentName" : "John", "StudentAge" : 20 } }