- 增加 DuckDB 数据库支持；

Providers/FreeSql.Provider.Duckdb/DuckdbAdo/DuckdbAdo.cs

@@ -0,0 +1,116 @@
+using FreeSql.Internal;
+using FreeSql.Internal.Model;
+using FreeSql.Internal.ObjectPool;
+using System;
+using System.Collections;
+using System.Data.Common;
+using System.Text;
+using System.Threading;
+using System.Linq;
+using FreeSql.Internal.CommonProvider;
+using DuckDB.NET.Data;
+using static DuckDB.NET.Native.NativeMethods;
+
+namespace FreeSql.Duckdb
+{
+    class DuckdbAdo : FreeSql.Internal.CommonProvider.AdoProvider
+    {
+        public DuckdbAdo() : base(DataType.DuckDB, null, null) { }
+        public DuckdbAdo(CommonUtils util, string masterConnectionString, string[] slaveConnectionStrings, Func<DbConnection> connectionFactory) : base(DataType.DuckDB, masterConnectionString, slaveConnectionStrings)
+        {
+            base._util = util;
+            if (connectionFactory != null)
+            {
+                var pool = new FreeSql.Internal.CommonProvider.DbConnectionPool(DataType.DuckDB, connectionFactory);
+                ConnectionString = pool.TestConnection?.ConnectionString;
+                MasterPool = pool;
+                _CreateCommandConnection = pool.TestConnection;
+                return;
+            }
+
+            var isAdoPool = masterConnectionString?.StartsWith("AdoConnectionPool,") ?? false;
+            if (isAdoPool) masterConnectionString = masterConnectionString.Substring("AdoConnectionPool,".Length);
+            if (!string.IsNullOrEmpty(masterConnectionString))
+                MasterPool = isAdoPool ?
+                    new DbConnectionStringPool(base.DataType, CoreStrings.S_MasterDatabase, () => DuckdbConnectionPool.CreateConnection(masterConnectionString)) as IObjectPool<DbConnection> :
+                    new DuckdbConnectionPool(CoreStrings.S_MasterDatabase, masterConnectionString, null, null);
+
+            slaveConnectionStrings?.ToList().ForEach(slaveConnectionString =>
+            {
+                var slavePool = isAdoPool ?
+                    new DbConnectionStringPool(base.DataType, $"{CoreStrings.S_SlaveDatabase}{SlavePools.Count + 1}", () => DuckdbConnectionPool.CreateConnection(slaveConnectionString)) as IObjectPool<DbConnection> :
+                    new DuckdbConnectionPool($"{CoreStrings.S_SlaveDatabase}{SlavePools.Count + 1}", slaveConnectionString, () => Interlocked.Decrement(ref slaveUnavailables), () => Interlocked.Increment(ref slaveUnavailables));
+                SlavePools.Add(slavePool);
+            });
+        }
+        public override object AddslashesProcessParam(object param, Type mapType, ColumnInfo mapColumn)
+        {
+            if (param == null) return "NULL";
+            if (mapType != null && mapType != param.GetType() && (param is IEnumerable == false))
+                param = Utils.GetDataReaderValue(mapType, param);
+
+            if (param is bool || param is bool?)
+                return (bool)param ? "true" : "false";
+            else if (param is string)
+                return string.Concat("'", param.ToString().Replace("'", "''"), "'");
+            else if (param is char)
+                return string.Concat("'", param.ToString().Replace("'", "''").Replace('\0', ' '), "'");
+            else if (param is Enum)
+                return AddslashesTypeHandler(param.GetType(), param) ?? ((Enum)param).ToInt64();
+            else if (decimal.TryParse(string.Concat(param), out var trydec))
+                return param;
+
+            else if (param is DateTime)
+                return AddslashesTypeHandler(typeof(DateTime), param) ?? string.Concat("timestamp '", ((DateTime)param).ToString("yyyy-MM-dd HH:mm:ss.ffffff"), "'");
+            else if (param is DateTime?)
+                return AddslashesTypeHandler(typeof(DateTime?), param) ?? string.Concat("timestamp '", ((DateTime)param).ToString("yyyy-MM-dd HH:mm:ss.ffffff"), "'");
+
+#if net60
+            else if (param is DateOnly || param is DateOnly?)
+                return AddslashesTypeHandler(typeof(DateOnly), param) ?? string.Concat("date '", ((DateOnly)param).ToString("yyyy-MM-dd"), "'");
+            else if (param is TimeOnly || param is TimeOnly?)
+            {
+                var ts = (TimeOnly)param;
+                return $"'{ts.Hour}:{ts.Minute}:{ts.Second}.{ts.Millisecond}'";
+            }
+#endif
+
+            else if (param is TimeSpan || param is TimeSpan?)
+            {
+                var ts = (TimeSpan)param;
+                return $"time '{Math.Min(24, (int)Math.Floor(ts.TotalHours))}:{ts.Minutes}:{ts.Seconds}.{ts.Milliseconds}'";
+            }
+            else if (param is byte[])
+            {
+                var sb = new StringBuilder().Append("'");
+                foreach (var vc in param as byte[]) sb.Append("\\x").Append(vc.ToString("X2"));
+                return sb.Append("'::blob").ToString();
+            }
+            else if (param is IEnumerable)
+                return AddslashesIEnumerable(param, mapType, mapColumn);
+
+            return string.Concat("'", param.ToString().Replace("'", "''"), "'");
+        }
+
+        DbConnection _CreateCommandConnection;
+        public override DbCommand CreateCommand()
+        {
+            if (_CreateCommandConnection != null)
+            {
+                var cmd = _CreateCommandConnection.CreateCommand();
+                cmd.Connection = null;
+                return cmd;
+            }
+            return new DuckDBCommand();
+        }
+
+        public override void ReturnConnection(IObjectPool<DbConnection> pool, Object<DbConnection> conn, Exception ex)
+        {
+            var rawPool = pool as DuckdbConnectionPool;
+            if (rawPool != null) rawPool.Return(conn, ex);
+            else pool.Return(conn);
+        }
+
+        public override DbParameter[] GetDbParamtersByObject(string sql, object obj) => _util.GetDbParamtersByObject(sql, obj);
+    }
+}