dbGetQuery-DatabaseConnectorConnection-character-method: Send query, retrieve results and then clear result set

In DatabaseConnector: Connecting to Various Database Platforms

Send query, retrieve results and then clear result set

Description

Returns the result of a query as a data frame. dbGetQuery() comes with a default implementation (which should work with most backends) that calls dbSendQuery(), then dbFetch(), ensuring that the result is always free-d by dbClearResult(). For retrieving chunked/paged results or for passing query parameters, see dbSendQuery(), in particular the "The data retrieval flow" section.

Usage

## S4 method for signature 'DatabaseConnectorConnection,character'
dbGetQuery(conn, statement, translate = TRUE, ...)

Arguments

conn	A DBIConnection object, as returned by dbConnect().
statement	a character string containing SQL.
translate	Translate the query using SqlRender?
...	Other parameters passed on to methods.

Details

This method is for SELECT queries only (incl. other SQL statements that return a SELECT-alike result, e. g. execution of a stored procedure or data manipulation queries like ⁠INSERT INTO ... RETURNING ...⁠). To execute a stored procedure that does not return a result set, use dbExecute().

Some backends may support data manipulation statements through this method for compatibility reasons. However, callers are strongly advised to use dbExecute() for data manipulation statements.

Value

dbGetQuery() always returns a data.frame with as many rows as records were fetched and as many columns as fields in the result set, even if the result is a single value or has one or zero rows.

See Also

For updates: dbSendStatement() and dbExecute().

Other DBIConnection generics: DBIConnection-class, dbAppendTable(), dbCreateTable(), dbDataType(), dbDisconnect(), dbExecute(), dbExistsTable(), dbGetException(), dbGetInfo(), dbIsReadOnly(), dbIsValid(), dbListFields(), dbListObjects(), dbListResults(), dbListTables(), dbReadTable(), dbRemoveTable(), dbSendQuery(), dbSendStatement(), dbWriteTable()

DatabaseConnector documentation built on Nov. 8, 2023, 5:07 p.m.