Changes between Version 20 and Version 21 of SemanticQuery

Timestamp:

Jan 2, 2014, 3:17:59 PM (11 years ago)

Author:

manualwiki

Comment:

--

SemanticQuery

@@ -84 +84 @@
 
 Atoms, strings, integers and properties can be used in comparisons. 
-The language uses {{{/=, ==, >=, =<, <, >}}} and {{{~}}}. 
+The language uses {{{/=, ==, >=, =<, <, >, ~}}} and {{{in}}}. 
 The results of comparisons are the same as in Erlang. 
 The resulting expressions can be combined by {{{and}}}, {{{or}}}, and {{{not}}} operators, and parentheses can be used, too. 
 The {{{~}}} operator is a regular expression matching operator, and it can be used anywhere,
- where other binary comparison operators can be used. The same expressions can be used, which can be used in the {{{re}}} module.
+where other binary comparison operators can be used. The same expressions can be used, which can be used in the {{{re}}} module.
+The {{{in}}} operator is similar to the {{{in}}} operator defined in SQL. To illustrate its usage, consider the following 2 semantic queries,
+which are semantically equivalent with each other.
+ * mods.funs[name = a or name = b or name = c]
+ * mods.funs[name in |a,b,c|]
 
 The operator precedence for the filters is as follows:
@@ -95 +99 @@
 ||{{{not}}} ||unary || 
 ||{{{/=, ==, >=, =<, <, >, =:=, =/=, ~}}} ||left associative || 
+||{{{in}}} ||left associative ||
 ||{{{and}}} ||left associative ||
 ||{{{or}}} ||left associative ||
@@ -111 +116 @@
 }}}
 
+''Example:'' you may be interested in all the module, whose name equals with one element of the following set : {a,b,c}
+{{{
+mods[ name in |a,b,c| ]
+}}}
 
 ==== Embedded queries ====