added get_sample procedure

Author: yorek

db/sql/07-get_sample.sql

@@ -0,0 +1,40 @@
+create or alter procedure dbo.get_sample
+@id int = null,
+@url nvarchar(1000) = null
+as
+set nocount on;
+set xact_abort on
+
+if (@id is not null and @url is not null) 
+begin
+    raiserror('Cannot specify both id and url', 16, 1)
+    return
+end
+
+declare @sid int
+
+if (@url is not null)
+begin
+    select @sid = id from dbo.samples where url = @url    
+end else begin
+    set @sid = @id
+end
+
+if (@sid is null) 
+begin
+    raiserror('Sample not found', 16, 1)
+    return
+end
+
+select 
+    json_object(
+        'name':[name],
+        'description':[description],
+        'notes':[notes],
+        'details': cast([details] as json),
+        'url': [url]
+    ) as sample_json
+from
+    dbo.samples
+where 
+    id = @sid