Supported Query Language Literals

Query language expressions can contain literals as well as operators and attribute names. The client supports many types of literals.

  • boolean. Boolean value, either TRUE or FALSE.
  • integer and long. Type long if it is suffixed with the ASCII letter L. Otherwise it is of type int.
  • floating point.Type float if it is suffixed with an ASCII letter F. Otherwise its type is double and it can optionally be suffixed with an ASCII letter D . A double or floating point literal can optionally include an exponent suffix of E or e, followed by a signed or unsigned number.
  • string. Delimited by single quotation marks. Embedded single quotation marks are doubled. For example, the character string 'Hello' evaluates to the value Hello, while the character string 'He said, ''Hello''' evaluates to He said, 'Hello'. Embedded newlines are kept as part of the string literal.
  • char. Type char if it is a string literal prefixed by the keyword CHAR; otherwise it is of type string. The CHAR literal for the single quotation mark character is CHAR '''' (four single quotation marks).
  • date. java.sql.Date object that uses the JDBC format prefixed with the DATE keyword: DATE yyyy-mm-dd. In the Date, yyyy represents the year, mm represents the month, and dd represents the day. The year must be represented by four digits; a two-digit shorthand for the year is not allowed.
  • time. Not supported.
  • timestamp. Not supported.
  • NIL. Equivalent alternative of NULL.
  • NULL. Same as null in Java.
  • UNDEFINED. Special literal that is a valid value for any data type. An UNDEFINED value is the result of accessing an attribute of a null-valued attribute. If you access an attribute that has an explicit value of null, then it is not undefined. For example, if a query accesses the attribute and address is null, then the result is undefined. If the query accesses address, then the result is not undefined, it is null.