Description

Reads a database table to a data frame, optionally converting a column to row names and converting the column names to valid R identifiers.

Usage

Arguments

Value

dbReadTable() returns a data frame that contains the complete data from the remote table, effectively the result of calling dbGetQuery() with SELECT * FROM <name>. An error is raised if the table does not exist. An empty table is returned as a data frame with zero rows.

The presence of rownames depends on the row.names argument, see sqlColumnToRownames() for details:

• If FALSE or NULL, the returned data frame doesn't have row names.

• If TRUE, a column named "row_names" is converted to row names, an error is raised if no such column exists.

• If NA, a column named "row_names" is converted to row names if it exists, otherwise no translation occurs.

• If a string, this specifies the name of the column in the remote table that contains the row names, an error is raised if no such column exists.

The default is row.names = FALSE.

If the database supports identifiers with special characters, the columns in the returned data frame are converted to valid R identifiers if the check.names argument is TRUE, If check.names = FALSE, the returned table has non-syntactic column names without quotes.

An error is raised when calling this method for a closed or invalid connection. An error is raised if name cannot be processed with dbQuoteIdentifier() or if this results in a non-scalar. Unsupported values for row.names and check.names (non-scalars, unsupported data types, NA for check.names) also raise an error.

See Also

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