Use a database connection to read from an existing SQL Server table with a SQL query.
db_read(con, query, pull_into_memory = TRUE)
con | An odbc database connection. Can be made using
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query | A string, quoted, required. This sql query will be executed against the database you are connected to. |
pull_into_memory | Logical, optional, defaults to TRUE. If FALSE,
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A tibble of data or reference to the table.
Use pull_into_memory
when working with large tables.
Rather than returning the data into memory, this
function will return a reference to the specified query. It will be executed
only when needed, in a "lazy" style. Or, you can execute using the
collect()
function.
build_connection_string
importFrom dbplyr as.sql
if (FALSE) { my_con <- build_connection_string(server = "HPHI-EDWDEV") con <- DBI::dbConnect(odbc::odbc(), .connection_string = my_con) d <- db_read(con, "SELECT TOP 10 * FROM [Shared].[Cost].[FacilityAccountCost]") # Get a reference and collect later ref <- db_read(con, "SELECT TOP 10 * FROM [Shared].[Cost].[FacilityAccountCost]", pull_into_memory = FALSE) d <- collect(ref) }