Reading previous comments, I have following ideas:
1/ Dump structure of your pg database and create another instance with equal structure, but without data. 
pg_dump -s dbname > dbname.dump
createdb dbname_fake
psql dbname_fake
\i dbname.dump

[download]
2/ Test the queries against this mockup database instance. It gives you ability to check the semantically wrong queries - relation xyz does not exist, for instance, not only syntactically erroneous queries.
3/ I think that the tested queries would have the structure similar to 
<sql>select * from xyz where col1 = ?;</sql>
<params>
  <param>123.5</param>
</params>

[download]
...and you will not have any problem with escaping, I hope :)
update: The commands of point 1/ ignore potential changes of database instance ownership and/or access rights, it is up to you to set these ...

In reply to Re: Escaping SQL correctly by pajout
in thread Escaping SQL correctly by Anonymous Monk

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