Language Elements

The CBFS Vault query language supports a wide variety of language elements, all of which are described below.

Logical Operators

Operator Operand type(s) Description
NOT, !, ~ Boolean Logical negation (NOT)
NOT, !, ~ Number Bitwise NOT
AND, & Boolean Logical AND
AND, & Number Bitwise AND
OR, | Boolean Logical OR
OR, | Number Bitwise OR

Arithmetic Operators

Operator Operand type(s) Description
+ Number, DateTime Addition
+ String String concatenation
- Number Negation
- Number, DateTime Subtraction
* Number Multiplication
/ Number Division (attempting to divide by zero will cause an exception)

Addition and subtraction operations involving DateTime operands behave as follows:

  • When adding a Number (n) and a DateTime, the result is a DateTime whose value has increased by n whole days.
  • When subtracting a Number (n) from a DateTime, the result is a DateTime whose value has decreased by n whole days.
  • When subtracting a DateTime from another DateTime, the result is a Number which reflects the difference as a number of whole days. The query evaluator converts both operands to whole days before performing the subtraction; "leftover" time is truncated as part of the conversion.

Relational Operators

Operator Operand type(s) Description
=, == All types Equal to
<>, != All types Not equal to
< All types Less than
> All types Greater than
<= All types Less than or equal to
>= All types Greater than or equal to

Conditions

Condition Operand type Description
IS [NOT] NULL All types Returns True if the value is/isn't NULL, and False otherwise.
IS [NOT] True Boolean Returns True if the value is/isn't True, and False otherwise.
IS [NOT] False Boolean Returns True if the value is/isn't False, and False otherwise.
[NOT] LIKE '...' [ESCAPE '...'] String Returns True if the value does/doesn't match the specified pattern; see notes below.

Keep the following in mind when using the LIKE condition:

  • Two kinds of wildcards are supported: %, which matches a string of any length; and _, which matches any single character. For example:
    • From LIKE '% Smith': Selects all files received from people with the last name "Smith".
    • From LIKE 'John Sm_th': Selects all files received from people with the first name "John" and a last name that is five characters long, begins with "Sm", and ends with "th" (Smith, Smyth, Smeth, etc.).
  • To search for values which include wildcard characters, the optional ESCAPE parameter can be used to specify a wildcard escape character. For example:
    • From LIKE 'John!_Smith' ESCAPE '!': Selects all files received from "John_Smith".
    • From LIKE 'John!_%' ESCAPE '!': Selects all files received from a name that begins with "John_".

File Variables

File variables represent some piece of information about the current file the query is being evaluated against.

Variable Type Description
FileName String The name of the current file.
FullName String The fully-qualified name of the current file, starting from the root directory /.
Path String The full path to the current file, including the final path separator (not including the file name).
IsFile Boolean True if the current file is not a directory, and False otherwise.
IsDirectory Boolean True if the current file is a directory, and False otherwise.
IsLink Boolean True if the current file is a symbolic link, and False otherwise.
LinkDestination String If the current file is a symbolic link, the link's target; otherwise acts the same as FullName.
CreationTime DateTime The current file's creation date and time.
LastAccessTime DateTime The current file's last access date and time.
ModificationTime DateTime The current file's last modification date and time.
Size Number The size of the current file (always 0 for directories).
Attributes Number The current file's attribute, encoded as a number.
IsEncrypted Boolean True if the current file is encrypted, and False otherwise.
IsCompressed Boolean True if the current file is compressed, and False otherwise. May be True for directories that contain files compressed by default.

Intrinsics

"Intrinsics" are the functions and constants built into the query language.

Intrinsic Operand type(s)Return typeDescription
D(value) String DateTime Converts a String to a DateTime; please refer to the Type Conversion topic for more information.
IsNull(value) All types Boolean Returns True if the value is NULL, and False otherwise.
IsNotNull(value) All types Boolean Returns True if the value is not NULL, and False otherwise.
Min(value1, value2) All types All types Returns the smaller of the two values.
Max(value1, value2) All types All types Returns the larger of the two values.
Now DateTime Returns the current system date and time.
Today DateTime Returns the current system date.
True Boolean Boolean True.
False Boolean Boolean False.

Precedence

The table below lists the query language's elements in order of descending precedence. Any legal expression within a query string may be surrounded with parentheses () in order to override precedence or increase readability.

PrecedenceLanguage Elements
1All File Variables
All Intrinsics (except D(value); see note)
2-: Arithmetic negation
NOT, !, ~: Logical/bitwise negation
D(value): Explicit String to DateTime conversion
3*: Multiplication
/: Division
4+: Addition/string concatenation
-: Subtraction
5=, ==: Equal to
<>, !=: Not equal to
<: Less than
>: Greater than
<=: Less than or equal to
>=: Greater than or equal to
IS [NOT], [NOT] LIKE: All Conditions
6AND, &: Logical/bitwise AND
7OR, |: Logical/bitwise OR

Note: The query engine treats the D(value) function as an operator, so its precedence is lower than the other intrinsics.

 
 
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CBFS Vault 2020 Java Edition - Version 20.0 [Build 7895]