Re: [Haskell-cafe] How to program with sqlite?

2008/3/22 Sebastian Sylvan :

On Sat, Mar 22, 2008 at 1:40 PM, Deng Chao wrote:

...

Hi all, I'm learning sqlite, and as I know haskell has some libraries like HDBC or HSQL can access sqlite DB. Can anybody give me a small example to show how to use it? It will be very appreciate? Thanks!

Best Regards, Deng Chao

Here's a quick GHCi session with HDBC.

Prelude> :m +Database.HDBC Prelude Database.HDBC> :m +Database.HDBC.Sqlite3 Prelude Database.HDBC Database.HDBC.Sqlite3> conn <- connectSqlite3 "mydb" Prelude Database.HDBC Database.HDBC.Sqlite3> quickQuery conn "CREATE TABLE mytable (FirstName varchar, LastName varchar, Age int )" [] [] Prelude Database.HDBC Database.HDBC.Sqlite3> quickQuery conn "INSERT INTO mytable VALUES ('Sebastian','Sylvan',26)" [] [] Prelude Database.HDBC Database.HDBC.Sqlite3> commit conn Prelude Database.HDBC Database.HDBC.Sqlite3> quickQuery conn "SELECT * FROM mytable" [] [[SqlString "Sebastian",SqlString "Sylvan",SqlString "26"]] Prelude Database.HDBC Database.HDBC.Sqlite3> disconnect conn

Not sure why that Age field came back as a string though :-)

This is SQLite's fault. In SQLite, all types are aliases for STRING. Whatever type you use in the create and insert, you will get strings back. /Björn