What's the Option=N in the MySQL ODBC connection string?

Question

I have seen both Option=3 and Option=4 in connection string samples for MySQL ODBC but no explanation or documentation. What do those numbers mean?

Solution

The Option= value is the sum of the numeric values for various flags that specify how Connector/ODBC should work. Its default value is 0.

From an older version of the Connector/ODBC documentation at :

Option=3; corresponded to FLAG_FIELD_LENGTH (1) + FLAG_FOUND_ROWS (2)

Option=4; was FLAG_DEBUG

According to the current list of Connector/ODBC options here ...

Table 5.2 Connector/ODBC Option Parameters

... both FLAG_FIELD_LENGTH (1) and FLAG_DEBUG (4) have been removed.

MySQL also recommends using the parameter names instead of (the sum of) their numeric values, not only for clarity, but because not all options have numeric values. So, instead of

Option=2;

we should use

FOUND_ROWS=1;

Comments

[Code Animal]

This was a life saver. I went from MySQL ODBC version 5.3.4 to 5.3.6 and the Option=3 in the connection string was all of a sudden throwing "MySQL Server has gone away" errors when I tried to open a recordset off of the connection (even thought the connection seemed to open fine). I changed the option part to FOUND_ROWS=1 and everything is now working fine. Thanks again!