Question

I want to retrieve these info for a mysql table using c#

1) Complete column definitions including name, size and data type, and extra info like null/not null, unsigned,auto increament, default values, if data type is enum, the accepted values

2) All constraints – Primary/Foreign/Check/Unique

3) All indexes

I can get column related basic info using ‘describe table_name’ query against the database.

but how to fetch all these info?

regards, Anjan

Answer 1

just throw queries against INFORMATION_SCHEMA…

For example, to get column definitions:

SELECT   TABLE_NAME        , COLUMN_NAME        , DATA_TYPE        , CHARACTER_MAXIMUM_LENGTH        , CHARACTER_OCTET_LENGTH         , NUMERIC_PRECISION         , NUMERIC_SCALE AS SCALE        , COLUMN_DEFAULT        , IS_NULLABLE FROM INFORMATION_SCHEMA.COLUMNS  

Take a look at the information schema tables to get additional info.

Hope it helps.