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18.3.1.7 Building vendor-specific SQL

Common SQL does not provide a general interface to vendor-specific syntax.

There are two approaches you can take with SQL such as this:

SELECT B.PARTY_CODE_ALIAS, A.VALUE FROM CODES A, CODE_ALIASES B
     WHERE A.DOMAIN=B.CODE_DOMAIN(+) AND A.VALUE=B.CODE_VALUE(+)
           AND B.PARTY_ID(+)=<party_id>
  1. Construct the string as above and then call query as described in Specifying SQL directly.
  2. Use sql-expression to construct the vendor-specific pieces of the SQL. The above expression can be written like this:
(sql:select [b party_code_alias] [a value]
            :from '([codes a] [codes_aliases b])
            :where [and [= [a domain] 
                           (sql:sql-expression 
                            :string "B.CODE_DOMAIN(+)")]
                        [= (sql:sql-expression 
                            :string "B.PARTY_ID(+)") PARTY-ID]])

LispWorks User Guide - 21 Jul 2006

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