- In mongoDB the data’s are displayed using the find().
- In general, it displays the Selected documents in a collection and returns a cursor to the selected documents.
db.collection.find(query, projection)
| Parameters |
Type |
Description |
| query |
document |
- Optional.
Specifies selection filter using query operators.
To return all documents in a collection, omit this parameter or pass an empty document ({}).
|
| projection |
document |
- Optional.
Specifies the fields to return in the documents that match the query filter.
To return all fields in the matching documents, omit this parameter. For details, see Projection.
|
- In mongoDB the projection parameter defines which fields are returned in the matching documents.
{ field1: <value>, field2: <value> ... }
- The <value> can be any of the following:
- 1 or true to include the field in the return documents.
- 0 or false to exclude the field.
- Executing db.collection.find() in the mongo shell automatically iterates the cursor to display up to the first 20 documents.
>db.mycol.find({key1:value1 }).pretty()
> db.wikitechy4.find({"author":"venkat"}).pretty()
{
"_id" : ObjectId("5731e258daa4a0bc932a2ff9"),
"websitename" : "www.wikitechy.com",
"details" : "learn mongodb basics and step by step",
"author" : "venkat"
}
{
"_id" : ObjectId("5731e296daa4a0bc932a2ffa"),
"websitename" : "www.wikitechy.com",
"details" : "learn mongodb basics and step by step",
"author" : "venkat"
}
>
- Here in this statement, we display the data’s from the collection “wikitechy4” where only the author name as “venkat” tends to display the data using find() rich query.
