Execute a query on a given database connection
dbSendQuery only submits and synchronously executes the
SQL query to the database engine. It does not extract any
records --- for that you need to use the function
then you must call
dbClearResult when you finish fetching the
records you need. For interactive use, you should almost always prefer
dbSendQuery(conn, statement, ...)
DBIConnectionobject, as produced by
- a character vector of length 1 containing SQL.
- Other parameters passed on to methods.
This function is for
SELECT queries only. Some backends may
support data manipulation queries through this function for compatibility
reasons. However, callers are strongly advised to use
dbSendStatement for data manipulation statements.
The query is submitted to the database server and the DBMS executes it,
possibly generating vast amounts of data. Where these data live
is driver-specific: some drivers may choose to leave the output on the server
and transfer them piecemeal to R, others may transfer all the data to the
client -- but not necessarily to the memory that R manages. See individual
dbSendQuery documentation for details.
Other DBIConnection generics:
con <- dbConnect(RSQLite::SQLite(), ":memory:") dbWriteTable(con, "mtcars", mtcars) rs <- dbSendQuery(con, "SELECT * FROM mtcars WHERE cyl = 4;") dbFetch(rs) dbClearResult(rs) dbDisconnect(con)