Drivers to test:

  + PostgreSQL (2 versions, ascii and unicode)
  + MySQL
  + Sqlite3 (2 versions, why?)
  - Oracle
  - DB2
  - Firebird
  - others?

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Driver: PostgreSQL Unicode

1 test fails: No error on multiple statements in string.

I haven't figured out how to configure the driver to get
SQLDescribeParam to work, so param types always reported as 'unknown.

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Driver: MySQL (/usr/lib/odbc/libmyodbc.so)

All tests pass.

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Driver: SQLite3 (/usr/lib/odbc/libsqlite3odbc.so)

A few tests fail because of wrong types, eg "1" returned instead of
1. When there is a declared type, the driver seems to believe it, and
use the closest suitable ODBC type. For example, a column declared
with type "date" actually gets converted to a date. If a value does
not fit the declared type, it is converted to NULL.

Some functions have surprising result types. For example, "count(*)"
returns a varchar rather than an integer.

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