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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/spec-result-send-statement.R
\docType{data}
\name{spec_result_send_statement}
\alias{spec_result_send_statement}
\title{spec_result_send_statement}
\value{
\code{dbSendStatement()} returns
an S4 object that inherits from \link[DBI:DBIResult-class]{DBI::DBIResult}.
The result set can be used with \code{\link[DBI:dbGetRowsAffected]{DBI::dbGetRowsAffected()}} to
determine the number of rows affected by the query.
Once you have finished using a result, make sure to clear it
with \code{\link[DBI:dbClearResult]{DBI::dbClearResult()}}.
}
\description{
spec_result_send_statement
}
\section{Failure modes}{
An error is raised when issuing a statement over a closed
or invalid connection,
or if the statement is not a non-\code{NA} string.
An error is also raised if the syntax of the query is invalid
and all query parameters are given (by passing the \code{params} argument)
or the \code{immediate} argument is set to \code{TRUE}.
}
\section{Specification}{
No warnings occur under normal conditions.
When done, the DBIResult object must be cleared with a call to
\code{\link[DBI:dbClearResult]{DBI::dbClearResult()}}.
Failure to clear the result set leads to a warning
when the connection is closed.
If the backend supports only one open result set per connection,
issuing a second query invalidates an already open result set
and raises a warning.
The newly opened result set is valid
and must be cleared with \code{dbClearResult()}.
The \code{param} argument allows passing query parameters, see \code{\link[DBI:dbBind]{DBI::dbBind()}} for details.
}
\section{Additional arguments}{
The following arguments are not part of the \code{dbSendStatement()} generic
(to improve compatibility across backends)
but are part of the DBI specification:
\itemize{
\item \code{params} (default: \code{NULL})
\item \code{immediate} (default: \code{NULL})
}
They must be provided as named arguments.
See the "Specification" sections for details on their usage.
}
\section{Specification for the \code{immediate} argument}{
The \code{immediate} argument supports distinguishing between "direct"
and "prepared" APIs offered by many database drivers.
Passing \code{immediate = TRUE} leads to immediate execution of the
query or statement, via the "direct" API (if supported by the driver).
The default \code{NULL} means that the backend should choose whatever API
makes the most sense for the database, and (if relevant) tries the
other API if the first attempt fails. A successful second attempt
should result in a message that suggests passing the correct
\code{immediate} argument.
Examples for possible behaviors:
\enumerate{
\item DBI backend defaults to \code{immediate = TRUE} internally
\enumerate{
\item A query without parameters is passed: query is executed
\item A query with parameters is passed:
\enumerate{
\item \code{params} not given: rejected immediately by the database
because of a syntax error in the query, the backend tries
\code{immediate = FALSE} (and gives a message)
\item \code{params} given: query is executed using \code{immediate = FALSE}
}
}
\item DBI backend defaults to \code{immediate = FALSE} internally
\enumerate{
\item A query without parameters is passed:
\enumerate{
\item simple query: query is executed
\item "special" query (such as setting a config options): fails,
the backend tries \code{immediate = TRUE} (and gives a message)
}
\item A query with parameters is passed:
\enumerate{
\item \code{params} not given: waiting for parameters via \code{\link[DBI:dbBind]{DBI::dbBind()}}
\item \code{params} given: query is executed
}
}
}
}
\seealso{
Other result specifications:
\code{\link{spec_result_clear_result}},
\code{\link{spec_result_create_table_with_data_type}},
\code{\link{spec_result_execute}},
\code{\link{spec_result_fetch}},
\code{\link{spec_result_get_query}},
\code{\link{spec_result_roundtrip}},
\code{\link{spec_result_send_query}}
}
\concept{result specifications}
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