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20.4.4.2 Add Documents

You can use the add() method to insert one document or a list documents into an existing collection using MySQL Shell. All examples in this section use the countryinfo collection.

Confirm the Schema

To show the value that is assigned to the schema variable, typedb.

mysql-py> db
<Schema:world_x>

If the schema value is not Schema:world_x, then set the db variable as follows:

mysql-py> \use world_x
Schema `world_x` accessible through db.
Add a Document

Insert the following document into the countryinfo collection. Press Enter twice to insert the document.

mysql-py> db.countryinfo.add(
 {
    "GNP": .6,
    "IndepYear": 1967,
    "Name": "Sealand",
    "_id": "SEA",
    "demographics": {
        "LifeExpectancy": 79,
        "Population": 27
    },
    "geography": {
        "Continent": "Europe",
        "Region": "British Islands",
        "SurfaceArea": 193
    },
    "government": {
        "GovernmentForm": "Monarchy",
        "HeadOfState": "Michael Bates"
    }
  }
)
Query OK, 1 item affected (0.02 sec)

The method returns the status of the operation.

Each document requires an identifier field called _id. The value of the _id field must be unique among all documents in the same collection. In MySQL Shell 1.0.11 (which was part of MySQL 5.7), if the document passed to the add() method did not contain the _id field, MySQL Shell as the client automatically inserted a field into the document and set the value to a generated universal unique identifier (UUID). In MySQL Shell 8.0.11 and higher, document IDs are generated by the server, not the client, so MySQL Shell does not now automatically set an _id value. A MySQL server at 8.0.11 or higher sets an _id value if the document does not contain the _id field. A MySQL server at an earlier 8.0 release or at 5.7 does not set an _id value in this situation, so you must specify it explicitly. If you do not, MySQL Shell returns error 5115 Document is missing a required field.

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