[oracle 12+] Test native identity support in bulk copy

Source/LinqToDB/DataProvider/Oracle/OracleBulkCopy.cs

@@ -279,9 +279,7 @@ static BulkCopyRowsCopied OracleMultipleRowsCopy2(MultipleRowsHelper helper, IEn
 			}
 
 			if (helper.CurrentCount > 0)
-			{
 				Execute(helper, list);
-			}
 
 			return helper.RowsCopied;
 		}
@@ -353,7 +351,11 @@ static bool Execute(MultipleRowsHelper helper, List<object> list)
 					? helper.MappingSchema.GetDataType(column.MemberType).Type.DataType
 					: column.DataType;
 
-				helper.Parameters.Add(new DataParameter(":p" + (i + 1), list.Select(o => column.GetValue(o)).ToArray(), dataType, column.DbType)
+				var value = new object?[list.Count];
+				for (var j = 0; j < value.Length; j++)
+					value[j] = column.GetValue(list[j]);
+
+				helper.Parameters.Add(new DataParameter(":p" + (i + 1), value, dataType, column.DbType)
 				{
 					Direction = ParameterDirection.Input,
 					IsArray   = true,
@@ -372,7 +374,11 @@ static Task<bool> ExecuteAsync(MultipleRowsHelper helper, List<object> list, Can
 					? helper.MappingSchema.GetDataType(column.MemberType).Type.DataType
 					: column.DataType;
 
-				helper.Parameters.Add(new DataParameter(":p" + (i + 1), list.Select(o => column.GetValue(o)).ToArray(), dataType, column.DbType)
+				var value = new object?[list.Count];
+				for (var j = 0; j < value.Length; j++)
+					value[j] = column.GetValue(list[j]);
+
+				helper.Parameters.Add(new DataParameter(":p" + (i + 1), value, dataType, column.DbType)
 				{
 					Direction = ParameterDirection.Input,
 					IsArray   = true,

Source/LinqToDB/DataProvider/Oracle/OracleTools.cs

@@ -10,17 +10,48 @@ namespace LinqToDB.DataProvider.Oracle
 	using Configuration;
 	using Data;
 
+	/// <summary>
+	/// Defines type of multi-row INSERT operation to generate for <see cref="BulkCopyType.RowByRow"/> bulk copy mode.
+	/// </summary>
 	public enum AlternativeBulkCopy
 	{
+		/// <summary>
+		/// This mode generates INSERT ALL statement.
+		/// Note that INSERT ALL doesn't support sequences and will use single generated value for all rows.
+		/// <code>
+		/// INSERT ALL
+		///     INTO target_table VALUES(/*row data*/)
+		///     ...
+		///     INTO target_table VALUES(/*row data*/)
+		/// </code>
+		/// </summary>
 		InsertAll,
+		/// <summary>
+		/// This mode performs regular INSERT INTO query with array of values for each column.
+		/// <code>
+		/// INSERT INTO target_table(/*columns*/)
+		///     VALUES(:column1ArrayParameter, ..., :columnXArrayParameter)
+		/// </code>
+		/// </summary>
 		InsertInto,
+		/// <summary>
+		/// This mode generates INSERT ... SELECT statement.
+		/// <code>
+		/// INSERT INTO target_table(/*columns*/)
+		///     SELECT /*row data*/ FROM DUAL
+		///     UNION ALL
+		///     ...
+		///     UNION ALL
+		///     SELECT /*row data*/ FROM DUAL
+		/// </code>
+		/// </summary>
 		InsertDual
 	}
 
 	public static partial class OracleTools
 	{
 #if NETFRAMEWORK
-		private static readonly Lazy<IDataProvider> _oracleNativeDataProvider11 = new Lazy<IDataProvider>(() =>
+		private static readonly Lazy<IDataProvider> _oracleNativeDataProvider11 = new (() =>
 		{
 			var provider = new OracleDataProvider(ProviderName.OracleNative, OracleVersion.v11);
 
@@ -29,7 +60,7 @@ public static partial class OracleTools
 			return provider;
 		}, true);
 
-		private static readonly Lazy<IDataProvider> _oracleNativeDataProvider12 = new Lazy<IDataProvider>(() =>
+		private static readonly Lazy<IDataProvider> _oracleNativeDataProvider12 = new (() =>
 		{
 			var provider = new OracleDataProvider(ProviderName.OracleNative, OracleVersion.v12);
 
@@ -39,7 +70,7 @@ public static partial class OracleTools
 		}, true);
 #endif
 
-		private static readonly Lazy<IDataProvider> _oracleManagedDataProvider11 = new Lazy<IDataProvider>(() =>
+		private static readonly Lazy<IDataProvider> _oracleManagedDataProvider11 = new (() =>
 		{
 			var provider = new OracleDataProvider(ProviderName.OracleManaged, OracleVersion.v11);
 
@@ -48,7 +79,7 @@ public static partial class OracleTools
 			return provider;
 		}, true);
 
-		private static readonly Lazy<IDataProvider> _oracleManagedDataProvider12 = new Lazy<IDataProvider>(() =>
+		private static readonly Lazy<IDataProvider> _oracleManagedDataProvider12 = new (() =>
 		{
 			var provider = new OracleDataProvider(ProviderName.OracleManaged, OracleVersion.v12);
 
@@ -301,8 +332,12 @@ public static DataConnection CreateDataConnection(IDbTransaction transaction, st
 				}, source);
 		}
 
-#endregion
+		#endregion
 
+		/// <summary>
+		/// Specifies type of multi-row INSERT operation to generate for <see cref="BulkCopyType.RowByRow"/> bulk copy mode.
+		/// Default value: <see cref="AlternativeBulkCopy.InsertAll"/>.
+		/// </summary>
 		public static AlternativeBulkCopy UseAlternativeBulkCopy = AlternativeBulkCopy.InsertAll;
 
 		[Obsolete("This field is not used by linq2db. Configure reader expressions on DataProvider directly")]