EJB query: BNF syntax

EJB QL ::= [select_clause] from_clause [where_clause] [order_by_clause]
DYNAMIC EJB QL :=select_clause_dynamic from_clause [where_clause]
      [group_by_clause] [having_clause] [order_by_clause]

from_clause::=FROM identification_variable_declaration 
              [,identification_variable_declaration]*

identification_variable_declaration::=collection_member_declaration |
     range_variable_declaration

collection_member_declaration::=
     IN ( collection_valued_path_expression ) [AS] identifier

range_variable_declaration::=abstract_schema_name [AS] identifier

single_valued_path_expression ::=
      {single_valued_navigation | identification_variable}. ( cmp_field |    
              method  |  cmp_field.value_object_attribute |  cmp_field.value_object_method )
       | single_valued_navigation

single_valued_navigation::=
       identification_variable.[  single_valued_cmr_field.  ]* 
            single_valued_cmr_field

collection_valued_path_expression ::=
       identification_variable.[  single_valued_cmr_field.  ]* 
           collection_valued_cmr_field

select_clause::= SELECT { ALL | DISTINCT }  {single_valued_path_expression |
                         identification_variable |  OBJECT ( identification_variable) |
                    aggregate_functions }

select_clause_dynamic ::= SELECT { ALL | DISTINCT }  [ selection , ]*  selection

selection  ::= { expression |  subselect } [[AS] id ]  

order_by_clause::= ORDER BY [ {single_valued_path_expression | integer}  [ASC|DESC],]*
      {single_valued_path_expression | integer}[ASC|DESC]

where_clause::= WHERE conditional_expression

conditional_expression ::= conditional_term | 
                           conditional_expression OR conditional_term

conditional_term ::= conditional_factor | 
                     conditional_term AND conditional_factor

conditional_factor ::= [NOT] conditional_primary

conditional_primary::=simple_cond_expression | (conditional_expression)

simple_cond_expression ::= comparison_expression | between_expression | 
       like_expression | in_expression | null_comparison_expression |
       empty_collection_comparison_expression | quantified_expression |
       exists_expression | is_of_type_expression  |  collection_member_expression

between_expression ::= expression [NOT] BETWEEN expression AND expression

in_expression ::= single_valued_path_expression [NOT] IN 
           { (subselect) |  ( atom ,]* atom) }

atom = { string-literal | numeric-constant | input-parameter }

like_expression ::= expression [NOT] LIKE 
                {string_literal | input_parameter} 
                [ESCAPE {string_literal | input_parameter}]

null_comparison_expression ::= 
       single_valued_path_expression IS [ NOT ] NULL

empty_collection_comparison_expression ::=
       collection_valued_path_expression IS [NOT] EMPTY

collection_member_expression  ::=
       { single_valued_path_expression |  input_paramter }  [ NOT ] MEMBER [ OF ]
         collection_valued_path_expression

quantified_expression ::=
       expression comparison_operator  {SOME | ANY | ALL} (subselect)

exists_expression ::= EXISTS {collection_valued_path_expression |  (subselect)}

subselect ::= SELECT [{ ALL | DISTINCT }]  expression  from_clause [where_clause] 
       [group_by_clause] [having_clause]

group_by_clause::= GROUP BY [single_valued_path_expression,]*
                    single_valued_path_expression

having_clause ::= HAVING conditional_expression

is_of_type_expression ::= identifier  IS OF TYPE
            ([[ONLY] abstract_schema_name,]* [ONLY] abstract_schema_name)

comparison_expression ::=  expression   comparison_operator { expression |  ( subquery ) }

comparison_operator ::=    = | > | >= | < | <= | <>

method ::=  method_name( [[expression , ]* expression ] )

expression ::= term |   expression {+|-} term

term ::=  factor |  term {*|/} factor

factor ::= {+|-} primary

primary ::= single_valued_path_expression | literal |
       ( expression ) |  input_parameter | functions | aggregate_functions

aggregate_functions :=
      AVG([ALL|DISTINCT] expression) |
      COUNT({[ALL|DISTINCT] expression |*| identification_variable }) |
      MAX([ALL|DISTINCT] expression) |
      MIN([ALL|DISTINCT] expression) |
      SUM([ALL|DISTINCT] expression) |

functions ::=
        ABS(expression) | 
        AVG([ALL|DISTINCT] expression) |
        BIGINT(expression) |
        CHAR({expression [,{ISO|USA|EUR|JIS}] )  |
        CONCAT (expression , expression ) |
        COUNT({[ALL|DISTINCT] expression | *}) |
        DATE(expression) |
        DAY({expression ) |
        DAYS( expression) |
        DECIMAL( expression [,integer[,integer]])
        DIGITS( expression) |
        DOUBLE( expression ) |
        FLOAT( expression) |
        HOUR ( expression ) |
        INTEGER( expression ) |
        LCASE ( expression) |
        LENGTH(expression) |
        LOCATE( expression, expression [, expression] ) |
        MAX([ALL|DISTINCT] expression) |
        MICROSECOND( expression ) |
        MIN([ALL|DISTINCT] expression) |
        MINUTE ( expression ) |
        MOD (expression, expression) |
        MONTH( expression ) |
        REAL( expression) |
        SECOND( expression ) |
        SMALLINT( expression )  |
        SQRT (  expression) |
        SUBSTRING( expression, expression[, expression]) |
        SUM([ALL|DISTINCT] expression) |
        TIME( expression ) |
        TIMESTAMP( expression ) |
        UCASE ( expression) |
        YEAR( expression )

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See Also

EJB query language

 

Related Tasks

Using EJB query

 

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