TESTS TO ADD
-* CACHE-TABLE-QUERIES
* Test that ":db-kind :key" adds an index for that key. This is complicated by
different backends showing autogenerated primary key in different ways.
* :db-constraint tests
-* test *db-auto-sync*
-* for-each-row macro
-* owner phrases for postgresql and oracle backends
* Number and Char field types
-* Add test case for return type of (setf slot-value-using-class)
* symbol slot
* generalized-boolean slot
-* column and table constraints in CREATE-TABLE and DEF-VIEW-CLASS.
+* tests for db-reader and db-writer
OPTIMIZATIONS
current behaviours using single database queries.
* Possible use of cached attribute type information for operations which
insert/update records as mentioned in the CommonSQL user guide.
+* Extend caching of generated SQL strings to more complex expressions which
+ are likely to be repeatedly executed many times.
POSSIBLE EXTENSIONS
* improve large object api and extend to databases beyond postgresql
* add support for prepared statements
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