是否可以获取Class :: DBI生成的SQL语句？

Question

I want to find the exact SQL statements that are generated by a Perl ORM package such as Class::DBI . I am not looking for SQL generated for simple inserts and deletes, but for row modifications that result from slightly complicated object manipulations (inserting rows in a table which is a child of a row in a parent table, for example)

Is there some way to get it?

Answer 1

Class::DBI uses DBI under the hood, so you can enable tracing of all SQL statements via an environment variable:

DBI_TRACE=3=dbi.log your-perl-script

Or inside of Perl, before executing any statements:

use DBI;
DBI->trace(2, 'dbi.log');

See http://metacpan.org/pod/DBI#TRACING

Answer 2

Since you said "such as"…

You can set the environment variable DBIC_TRACE to 1 if you are using DBIx::Class (which has a Class::DBI compatibility layer ).