Literals

String Literal

A string literal is enclosed in single quotes. To represent a single quote within a literal, use two single quotes; for example, 'literal''s'. String literals use the Unicode character encoding. String literals are case sensitive. The server has a limit of 32,767 string literals in a selector string.

Exact Numeric Literal

An exact numeric literal is a numeric value without a decimal point, such as 57, -957, and +62; numbers of long are supported.

Approximate Numeric Literal

An approximate numeric literal is a numeric value with a decimal point (such as 7., -95.7, and +6.2), or a numeric value in scientific notation (such as 7E.3 and -57.9E2); numbers in the range of double are supported. Approximate literals use floating-point literal syntax of the Java programming language.

Boolean Literal

The boolean literals are TRUE and FALSE (case insensitive).

Internal computations of expression values use a 3-value boolean logic similar to SQL. However, the final value of an expression is always either TRUE or FALSE, but never UNKNOWN.

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