move database utils to Database/Utils, create DatabaseMigrator

PluralKit.Core/Utils/ConnectionUtils.cs

@@ -1,18 +0,0 @@
-using System.Collections.Generic;
-using System.Data.Common;
-
-using Dapper;
-
-namespace PluralKit.Core {
-    public static class ConnectionUtils
-    {
-        public static async IAsyncEnumerable<T> QueryStreamAsync<T>(this IPKConnection conn, string sql, object param)
-        {
-            await using var reader = (DbDataReader) await conn.ExecuteReaderAsync(sql, param);
-            var parser = reader.GetRowParser<T>();
-            
-            while (await reader.ReadAsync())
-                yield return parser(reader); 
-        }
-    }
-}

PluralKit.Core/Utils/DatabaseUtils.cs

@@ -1,20 +0,0 @@
-using System.Threading;
-
-namespace PluralKit.Core
-{
-    public class DbConnectionCountHolder
-    {
-        private int _connectionCount;
-        public int ConnectionCount => _connectionCount;
-
-        public void Increment()
-        {
-            Interlocked.Increment(ref _connectionCount);
-        }
-
-        public void Decrement()
-        {
-            Interlocked.Decrement(ref _connectionCount);
-        }
-    }
-}

PluralKit.Core/Utils/QueryBuilder.cs

@@ -1,88 +0,0 @@
-#nullable enable
-using System;
-using System.Text;
-
-namespace PluralKit.Core
-{
-    public class QueryBuilder
-    {
-        private readonly string? _conflictField;
-        private readonly string? _condition;
-        private readonly StringBuilder _insertFragment = new StringBuilder();
-        private readonly StringBuilder _valuesFragment = new StringBuilder();
-        private readonly StringBuilder _updateFragment = new StringBuilder();
-        private bool _firstInsert = true;
-        private bool _firstUpdate = true;
-        public QueryType Type { get; }
-        public string Table { get; }
-
-        private QueryBuilder(QueryType type, string table, string? conflictField, string? condition)
-        {
-            Type = type;
-            Table = table;
-            _conflictField = conflictField;
-            _condition = condition;
-        }
-        
-        public static QueryBuilder Insert(string table) => new QueryBuilder(QueryType.Insert, table,  null, null);
-        public static QueryBuilder Update(string table, string condition) => new QueryBuilder(QueryType.Update, table, null, condition);
-        public static QueryBuilder Upsert(string table, string conflictField) => new QueryBuilder(QueryType.Upsert, table, conflictField, null);
-
-        public QueryBuilder Constant(string fieldName, string paramName)
-        {
-            if (_firstInsert) _firstInsert = false;
-            else 
-            {
-                _insertFragment.Append(", ");
-                _valuesFragment.Append(", ");
-            }
-            
-            _insertFragment.Append(fieldName);
-            _valuesFragment.Append(paramName);
-            return this;
-        }
-        
-        public QueryBuilder Variable(string fieldName, string paramName)
-        {
-            Constant(fieldName, paramName);
-            
-            if (_firstUpdate) _firstUpdate = false;
-            else _updateFragment.Append(", ");
-            
-            _updateFragment.Append(fieldName);
-            _updateFragment.Append(" = ");
-            _updateFragment.Append(paramName);
-            return this;
-        }
-
-        public string Build(string? suffix = null)
-        {
-            if (_firstInsert)
-                throw new ArgumentException("No fields have been added to the query.");
-            
-            StringBuilder query = new StringBuilder(Type switch
-            {
-                QueryType.Insert => $"insert into {Table} ({_insertFragment}) values ({_valuesFragment})",
-                QueryType.Upsert => $"insert into {Table} ({_insertFragment}) values ({_valuesFragment}) on conflict ({_conflictField}) do update set {_updateFragment}",
-                QueryType.Update => $"update {Table} set {_updateFragment}",
-                _ => throw new ArgumentOutOfRangeException($"Unknown query type {Type}")
-            });
-
-            if (Type == QueryType.Update && _condition != null)
-                query.Append($" where {_condition}");
-            
-            if (!string.IsNullOrEmpty(suffix))
-                query.Append($" {suffix}");
-            query.Append(";");
-
-            return query.ToString();
-        }
-
-        public enum QueryType
-        {
-            Insert,
-            Update,
-            Upsert
-        }
-    }
-}

PluralKit.Core/Utils/UpdateQueryBuilder.cs

@@ -1,45 +0,0 @@
-using System.Text;
-
-using Dapper;
-
-namespace PluralKit.Core
-{
-    public class UpdateQueryBuilder
-    {
-        private readonly QueryBuilder _qb;
-        private readonly DynamicParameters _params = new DynamicParameters();
-
-        private UpdateQueryBuilder(QueryBuilder qb)
-        {
-            _qb = qb;
-        }
-        
-        public static UpdateQueryBuilder Insert(string table) => new UpdateQueryBuilder(QueryBuilder.Insert(table));
-        public static UpdateQueryBuilder Update(string table, string condition) => new UpdateQueryBuilder(QueryBuilder.Update(table, condition));
-        public static UpdateQueryBuilder Upsert(string table, string conflictField) => new UpdateQueryBuilder(QueryBuilder.Upsert(table, conflictField));
-
-        public UpdateQueryBuilder WithConstant<T>(string name, T value)
-        {
-            _params.Add(name, value);
-            _qb.Constant(name, $"@{name}");
-            return this;
-        }
-
-        public UpdateQueryBuilder With<T>(string columnName, T value)
-        {
-            _params.Add(columnName, value);
-            _qb.Variable(columnName, $"@{columnName}");
-            return this;
-        }
-
-        public UpdateQueryBuilder With<T>(string columnName, Partial<T> partialValue)
-        {
-            return partialValue.IsPresent ? With(columnName, partialValue.Value) : this;
-        }
-
-        public (string Query, DynamicParameters Parameters) Build(string suffix = "")
-        {
-            return (_qb.Build(suffix), _params);
-        }
-    }
-}