匹配特定记录的 MongoDB 正则表达式?
让我们首先创建一个文档集合 -
> dbworkingOfRegularExpressionDemoinsertOne({ "StudentDetails" : { "StudentName" : "John" },"StudentAge":21 });
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf227acb64a577be5a2bc07")
}
> dbworkingOfRegularExpressionDemoinsertOne({ "StudentDetails" : { "StudentName" : "JOHN" },"StudentAge":19 });
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf227b8b64a577be5a2bc08")
}
> dbworkingOfRegularExpressionDemoinsertOne({ "StudentDetails" : { "StudentName" : "Carol" },"StudentAge":20 });
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf227c2b64a577be5a2bc09")
}以下是使用 find() 方法从集合中显示所有文档的查询 -
> dbworkingOfRegularExpressionDemofind();
这将生成以下文档 -
{ "_id" : ObjectId("5cf227acb64a577be5a2bc07"), "StudentDetails" : { "StudentName" : "John" }, "StudentAge" : 21 }
{ "_id" : ObjectId("5cf227b8b64a577be5a2bc08"), "StudentDetails" : { "StudentName" : "JOHN" }, "StudentAge" : 19 }
{ "_id" : ObjectId("5cf227c2b64a577be5a2bc09"), "StudentDetails" : { "StudentName" : "Carol" }, "StudentAge" : 20 }
Following is the regular expression to get the document with StudentName JOHN:
> dbworkingOfRegularExpressionDemofind({'StudentDetailsStudentName': /JOHN/});
这将生成以下文档 -
{ "_id" : ObjectId("5cf227b8b64a577be5a2bc08"), "StudentDetails" : { "StudentName" : "JOHN" }, "StudentAge" : 19 }
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