Update cheatsheets

mongoimport

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mongoimport
+
+> Imports content from a JSON, CSV, or TSV file into a MongoDB database.
+> More information: <https://docs.mongodb.com/database-tools/mongoimport/>.
+
+- Import a JSON file into a specific collection:
+
+`mongoimport --file={{path/to/file.json}} --uri={{mongodb_uri}} --collection={{collection_name}}`
+
+- Import a CSV file, using the first line of the file to determine field names:
+
+`mongoimport --type={{csv}} --file={{path/to/file.csv}} --db={{database_name}} --collection={{collection_name}}`
+
+- Import a JSON array, using each element as a separate document:
+
+`mongoimport --jsonArray --file={{path/to/file.json}}`
+
+- Import a JSON file using a specific mode and a query to match existing documents:
+
+`mongoimport --file={{path/to/file.json}} --mode={{delete|merge|upsert}} --upsertFields="{{field1,field2,...}}"`
+
+- Import a CSV file, reading field names from a separate CSV file and ignoring fields with empty values:
+
+`mongoimport --type={{csv}} --file={{path/to/file.csv}} --fieldFile={{path/to/field_file.csv}} --ignoreBlanks`
+
+- Display help:
+
+`mongoimport --help`