Saturday, September 22, 2007

Team exhibition - Baby talking MySQL


At the MySQL Developers Meeting in Heidelberg there were show off sessions where each team had a chance of showing their best to others.
As part of this shut out presentation, I demonstrated some MySQL Proxy magic.

This is a sample session from that presentation.
mysql> select 1 + 1;
+-------------------------------+
| ERROR |
+-------------------------------+
| Don't understand these digits |
+-------------------------------+
1 row in set (0.00 sec)

# Hmmm!
# Let's try to make it understand ...

mysql> set sql_mode='english_digits'; # You did not know we could do that. Did you?
Query OK, 42 rows affected (0.01 sec)

mysql> select 1 + 1;
+--------+
| result |
+--------+
| two |
+--------+
1 row in set (0.00 sec)

# Clever!
# perhaps it understands something more

mysql> select 1 + two;
+--------+
| result |
+--------+
| three |
+--------+
1 row in set (0.00 sec)

# Ok. What about two numbers?

mysql> select seven + two;
+--------+
| result |
+--------+
| nine |
+--------+
1 row in set (0.00 sec)

# Very good. Now how about something other than adding numbers?

mysql> select seven * two;
+----------+
| result |
+----------+
| fourteen |
+----------+
1 row in set (0.00 sec)

# Pushing it a bit ?

mysql> select seven * three;
+-----------------------------------------------+
| result |
+-----------------------------------------------+
| Can't count beyond my fingers and toes. (21?) |
+-----------------------------------------------+
1 row in set (0.00 sec)

# Well, it has some limitations!
As an exercise for the reader, you can figure out the Lua script that made the above exchange possible.

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