Check if container exists in database

Usage

docdb_exists(src, key, ...)

src: Source object, result of call to any of functions src_mongo(), src_sqlite(), src_elastic(), src_couchdb() src_duckdb() or src_postgres()
key: (character) The name of the container in the database backend (corresponds to collection for MongoDB, dbname for CouchDB, index for Elasticsearch, and to a table name for DuckDB, SQLite and PostgreSQL)
...: Passed to functions DBI::dbListTables(), elastic::index_exists(), and sofa::db_info()

(logical) TRUE or FALSE to indicate existence of container key in database. Note this does not indicate if the container holds any documents.

if (FALSE) {
src <- src_sqlite()
docdb_exists(src, "nonexistingcontainer")
docdb_create(src, "mtcars", mtcars)
docdb_exists(src, "mtcars")
}