67 lines
1.7 KiB
Plaintext
67 lines
1.7 KiB
Plaintext
|
Grammar for the SQL dialect support in ADSI's OLE DB provider.
|
||
|
|
|
||
|
|
The grammar we used is a subset derived from the SQL ODBC miniumum grammar.
|
||
|
|
|
||
|
|
2.1 The Terminal Tokens
|
||
|
|
TERMINAL SYMBOLS (TOKENS) to be expected by the parser.
|
||
|
|
|
||
|
|
TOKEN_ERROR
|
||
|
|
TOKEN_STAR
|
||
|
|
TOKEN_LPARAN
|
||
|
|
TOKEN_RPARAN
|
||
|
|
TOKEN_INTEGER_LITERAL
|
||
|
|
TOKEN_REAL_LITERAL
|
||
|
|
TOKEN_STRING_LITERAL
|
||
|
|
TOKEN_USER_DEFINED_NAME
|
||
|
|
TOKEN_COMMA
|
||
|
|
TOKEN_SELECT
|
||
|
|
TOKEN_ALL
|
||
|
|
TOKEN_FROM
|
||
|
|
TOKEN_WHERE
|
||
|
|
TOKEN_BOOLEAN_LITERAL
|
||
|
|
TOKEN_AND
|
||
|
|
TOKEN_OR
|
||
|
|
TOKEN_NOT
|
||
|
|
TOKEN_END
|
||
|
|
TOKEN_LT
|
||
|
|
TOKEN_GT
|
||
|
|
TOKEN_GE
|
||
|
|
TOKEN_LE
|
||
|
|
TOKEN_EQ
|
||
|
|
TOKEN_NE
|
||
|
|
|
||
|
|
2.2 The Grammer
|
||
|
|
statement ::= select-statement
|
||
|
|
|
||
|
|
select-statement ::= TOKEN_SELECT [TOKEN_ALL] select-list TOKEN_FROM table-identifier [TOKEN_WHERE search-condition]
|
||
|
|
|
||
|
|
select-list ::= TOKEN_STAR | select-sublist [TOKEN_COMMA select-sublist]...
|
||
|
|
|
||
|
|
select-sublist ::= column-identifier
|
||
|
|
|
||
|
|
column-identifier ::= TOKEN_USER_DEFINED_NAME
|
||
|
|
|
||
|
|
table-identifier ::= TOKEN_STRING_LITERAL
|
||
|
|
|
||
|
|
search-condition ::= boolean-term [TOKEN_OR search-condition]
|
||
|
|
|
||
|
|
boolean-term ::= boolean-factor [TOKEN_AND boolean-term]
|
||
|
|
|
||
|
|
boolean-factor ::= [TOKEN_NOT] boolean-primary
|
||
|
|
|
||
|
|
boolean-primary ::= comparison-predicate | TOKEN_LPARAN search-condition TOKEN_RPARAN
|
||
|
|
|
||
|
|
comparison-predicate ::= column-identifier TOKEN_COMPARISON_OPERATOR literal
|
||
|
|
|
||
|
|
literal ::= TOKEN_STRING_LITERAL | numeric-literal | TOKEN_BOOLEAN_LITERAL
|
||
|
|
|
||
|
|
numeric-literal ::= TOKEN_INTEGER_LITERAL | TOKEN_REAL_LITERAL
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
For example, the tokens generated by the lexer for the following SQL statement
|
||
|
|
|
||
|
|
SELECT CN, objectClass FROM 'LDAP://ntdsdc1/c=US/O=Microsoft/OU=NTDS' WHERE
|
||
|
|
ObjectClass = User OR AGE > 25
|
||
|
|
|