escape function

Escape/quote a string.

escape() requires you to provide a database connection to control the details of escaping. escape_ansi() uses the SQL 92 ANSI standard.

escape(x, parens = NA, collapse = " ", con = NULL)

escape_ansi(x, parens = NA, collapse = "")

sql_vector(x, parens = NA, collapse = " ", con = NULL)

Arguments

• x: An object to escape. Existing sql vectors will be left as is, character vectors are escaped with single quotes, numeric vectors have trailing .0 added if they're whole numbers, identifiers are escaped with double quotes.

• parens, collapse: Controls behaviour when multiple values are supplied. parens should be a logical flag, or if NA, will wrap in parens if length > 1.

  Default behaviour: lists are always wrapped in parens and separated by commas, identifiers are separated by commas and never wrapped, atomic vectors are separated by spaces and wrapped in parens if needed.

• con: Database connection.

Examples

# Doubles vs. integers
escape_ansi(1:5)
escape_ansi(c(1, 5.4))

# String vs known sql vs. sql identifier
escape_ansi("X")
escape_ansi(sql("X"))
escape_ansi(ident("X"))

# Escaping is idempotent
escape_ansi("X")
escape_ansi(escape_ansi("X"))
escape_ansi(escape_ansi(escape_ansi("X")))