f# - SqlDataProvider connection string in Suave on Azure -


i can't sqldataprovider work when executed in fsx script running in azure web site.

i have started samples tomas petrecek has here: https://github.com/tpetricek/dojo-suave-fshome.

in short fsx script executed using iis httpplatformhandler http requests azure web site forwarded f# script.

the f# script use suave handle requests.

when tried adding database access http handlers got problems.

the problematic code looks this:

[<literal>] let connstr = "server=(localdb)\\v11.0;initial catalog=my_database;integrated security=true;"  [<literal>] let resolutionfolder = __source_directory__ fsharp.data.sql.common.queryevents.sqlqueryevent |> event.add (printfn "executing sql: %s")  // following line fails when executing in azure type db = sqldataprovider<connstr, common.databaseprovidertypes.mssqlserver, resolutionpath = resolutionfolder>  let savedata somedatatosave =   let ctx = db.getdatacontext(environment.getenvironmentvariable("sqlazureconnstr_queries"))   .....   /// code using context here

this works fine when run locally, when deploy azure site fail @ line type dbis created.

the error message (line 70 line has type db = ...:

d:\home\site\wwwroot\app.fsx(70,11): error fs3033: type provider 'fsharp.data.sql.sqltypeprovider' reported error: network-related or instance-specific error occurred while establishing connection sql server. server not found or not accessible. verify instance name correct , sql server configured allow remote connections. (provider: sql network interfaces, error: 52 - unable locate local database runtime installation. verify sql server express installed , local database runtime feature enabled.)

the design-time database in connstr not available in azure site, thought why have getdatacontext overload takes connection string used @ run-time?

is because running script , not compiled code trying access database when creating typeprovider? if yes, mean option compile , provide database code compiled assembly load , use in suave fsx script?

reading connection string config file not work in azure site. need connection string environment variable (which set in azure management interface).

hmm, bit unfortunate - @fyodor mentioned in comments, problem script-based deployment azure compiles script on azure machine - , need have statically-resolved connection string works on azure.

there 2 options:

  1. use compiled project instead. if compile f# code locally , deploy compiled code azure work. sadly, there no samples that.

  2. do clever trick make connection string accessible script @ compile time.

  3. send pr sql provider can give name of environment variable , reads connection string there.

i think (3) quite nice , useful feature.

i'm not sure best way (2) be. think might able modify app.azure.fsx creates file (say connection.fsx) contains like:

module connection let [<literal>] connstring = "<contents of sqlazureconnstr_queries>"

then app.fsx load script , use connection.connstring in argument of sql type provider.


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