- Database namespace is now NadekoBot.Db

- Db related code is now in src/NadekoBot/Db
- Finished major part of the db refactor, but many optimizations are left to be made

src/NadekoBot/Db/Extensions/QuoteExtensions.cs

@@ -0,0 +1,53 @@
+using NadekoBot.Core.Services.Database.Models;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using NadekoBot.Common;
+
+namespace NadekoBot.Db
+{
+    public static class QuoteExtensions
+    {
+        public static IEnumerable<Quote> GetGroup(this DbSet<Quote> quotes, ulong guildId, int page, OrderType order)
+        {
+            var q = quotes.AsQueryable().Where(x => x.GuildId == guildId);
+            if (order == OrderType.Keyword)
+                q = q.OrderBy(x => x.Keyword);
+            else
+                q = q.OrderBy(x => x.Id);
+
+            return q.Skip(15 * page).Take(15).ToArray();
+        }
+
+        public static async Task<Quote> GetRandomQuoteByKeywordAsync(this DbSet<Quote> quotes, ulong guildId, string keyword)
+        {
+            var rng = new NadekoRandom();
+            return (await quotes.AsQueryable()
+                .Where(q => q.GuildId == guildId && q.Keyword == keyword)
+                .ToListAsync())
+                .OrderBy(q => rng.Next())
+                .FirstOrDefault();
+        }
+
+        public static async Task<Quote> SearchQuoteKeywordTextAsync(this DbSet<Quote> quotes, ulong guildId, string keyword, string text)
+        {
+            var rngk = new NadekoRandom();
+            return (await quotes.AsQueryable()
+                .Where(q => q.GuildId == guildId
+                            && q.Keyword == keyword
+                            && EF.Functions.Like(q.Text.ToUpper(), $"%{text.ToUpper()}%")
+                            // && q.Text.Contains(text, StringComparison.OrdinalIgnoreCase)
+                            )
+                .ToListAsync())
+                .OrderBy(q => rngk.Next())
+                .FirstOrDefault();
+        }
+
+        public static void RemoveAllByKeyword(this DbSet<Quote> quotes, ulong guildId, string keyword)
+        {
+            quotes.RemoveRange(quotes.AsQueryable().Where(x => x.GuildId == guildId && x.Keyword.ToUpper() == keyword));
+        }
+
+    }
+}