ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
SQL support in local databases
comment ::= single-line-comment |
block-comment
single-line-comment ::= -- single-line
block-comment ::= /* multiple-lines or block [*/]
A single-line comment is indicated by two dashes. A single line comment only extends to the end of the current line.
Block comments can span any number of lines, or be embedded within a single line. If there is no terminating
delimiter, a block comment extends to the end of the input. This situation is not treated as an error. A new SQL
statement can begin on a line after a block comment ends. Block comments can be embedded anywhere white space
can occur, including inside expressions, and in the middle of other SQL statements. Block comments do not nest.
Single-line comments inside a block comment are ignored.
EXPRESSIONS
Expressions are subcommands within other SQL blocks. The following describes the valid syntax for an expression
within a SQL statement:
expr ::= expr binary-op expr |
expr [NOT] like-op expr [ESCAPE expr] |
unary-op expr |
( expr ) |
column-name |
table-name.column-name |
database-name.table-name.column-name |
literal-value |
parameter |
function-name( expr-list | * ) |
expr ISNULL |
expr NOTNULL |
expr [NOT] BETWEEN expr AND expr |
expr [NOT] IN ( value-list ) |
expr [NOT] IN ( select-statement ) |
expr [NOT] IN [database-name.] table-name |
[EXISTS] ( select-statement ) |
CASE [expr] ( WHEN expr THEN expr )+ [ELSE expr] END |
CAST ( expr AS type ) |
expr COLLATE collation-name
like-op ::= LIKE | GLOB
binary-op ::= see Operators
unary-op ::= see Operators
parameter ::= :param-name | @param-name | ?
value-list ::= literal-value [, literal-value]*
literal-value ::= literal-string | literal-number | literal-boolean | literal-blob |
literal-null
literal-string ::= 'string value'
literal-number ::= integer | number
literal-boolean ::= true | false
literal-blob ::= X'string of hexadecimal data'
literal-null ::= NULL
An expression is any combination of values and operators that can be resolved to a single value. Expressions can be
divided into two general types, according to whether they resolve to a boolean (true or false) value or whether they
resolve to a non-boolean value.
Last updated 6/6/2012
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