Difference between revisions of "MongoDB Delete"
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Jump to navigationJump to search| Line 30: | Line 30: | ||
Department 40 has closed down: | Department 40 has closed down: | ||
| − | db. | + | db.dept.deleteOne({deptno:40}) |
Note, if the query_criteria only returns one document, '''remove()''' and '''deleteOne()''' will have the same effect. | Note, if the query_criteria only returns one document, '''remove()''' and '''deleteOne()''' will have the same effect. | ||
| Line 37: | Line 37: | ||
Check that the collection has gone: | Check that the collection has gone: | ||
| − | db. | + | db.dept.find({deptno:40}) |
== Next Step == | == Next Step == | ||
This concludes the section on manipulating collections. Return to the [[MongoDB_Workbook|Workbook]]. | This concludes the section on manipulating collections. Return to the [[MongoDB_Workbook|Workbook]]. | ||
Revision as of 18:01, 12 November 2017
Main Page >> MongoDB >>MongoDB Workbook >> Deleting a Document/Collection
Deleting a Document
At some stage you may want to delete a document from a collection. The format is:
db.collectionName.deleteOne(query_criteria) /* deletes the first document found that matches the query criteria */
db.collectionName.remove(query_criteria) /* deletes all documents found that matches the query criteria */
db.collectionName.remove(query_criteria) /* deletes all documents in a collection (use with care!) */
Deleting a Collection
If you want to drop a collection completely, including any data held in it:
db.collectionName.drop() /* removes a collection completely (use with care!) */
Delete Department 40
Department 40 has closed down:
db.dept.deleteOne({deptno:40})
Note, if the query_criteria only returns one document, remove() and deleteOne() will have the same effect.
Check that the collection has gone:
db.dept.find({deptno:40})
Next Step
This concludes the section on manipulating collections. Return to the Workbook.
