On 13.07.2015 18:09, Madhura Jayaratne wrote:

Hi Dan,

MariaDB (5.2.0+) supports virtual columns and the syntax is 

<type>  [GENERATED ALWAYS]  AS   ( <expression> ) [VIRTUAL | PERSISTENT]  [UNIQUE] [UNIQUE KEY] [COMMENT <text>]

While implementing [1], to add parser support for virtual columns, I tried to model this syntax using $FIELD_OPTIONS [2]. Even though I am able to retrieve the expression this way, all the brackets and spaces of the expression are gone. As I understand, this due to the tokenization. 

Do you have any suggestion for an alternative approach?

[1] https://sourceforge.net/p/phpmyadmin/feature-requests/1517/

[2] https://github.com/madhuracj/phpmyadmin/commit/b287aae9d56c4ae15d850b47a5f76d49f4f155ba

--

Thanks and Regards,

Madhura Jayaratne

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Hello Madhura,

The way you approached this was the correct solution, however, there was a bug in my code which skipped white-spaces. I am not sure what exactly you want to extract from that expression and I implemented here [2] a new type of option "expr" that should make your job easier and parse an expression directly.

You can find here [1] a snippet of code I used to parse a CREATE statement that contains virtual fields and the result of the parsing. As you can see, the fact that I used the `Expression` component to parse the expression extracted the function name as well. Anyway, you can continue using the "var" option which will only format the expression, without extracting any information.

[1] https://gist.github.com/udan11/4b6eaee2a1fb7fa315c2
[2] https://github.com/udan11/sql-parser/commit/68ad40b4f30c0ff55d662413729fec4a535a3fec

Best regards,
Dan Ungureanu