Add new db.DeleteAll<T>(rows) API

Author: mythz

src/ServiceStack.OrmLite/OrmLiteWriteApi.cs

@@ -174,6 +174,16 @@ public static int DeleteAll<T>(this IDbConnection dbConn)
             return dbConn.Exec(dbCmd => dbCmd.DeleteAll<T>());
         }
 
+        /// <summary>
+        /// Delete all rows provided. E.g:
+        /// <para>db.DeleteAll&lt;Person&gt;(people)</para>
+        /// </summary>
+        /// <returns>number of rows deleted</returns>
+        public static int DeleteAll<T>(this IDbConnection dbConn, IEnumerable<T> rows)
+        {
+            return dbConn.Exec(dbCmd => dbCmd.DeleteAll(rows));
+        }
+
         /// <summary>
         /// Delete all rows in the runtime table type. E.g:
         /// <para>db.DeleteAll(typeof(Person))</para>

src/ServiceStack.OrmLite/OrmLiteWriteCommandExtensions.cs

@@ -642,6 +642,12 @@ internal static int DeleteAll<T>(this IDbCommand dbCmd)
             return DeleteAll(dbCmd, typeof(T));
         }
 
+        internal static int DeleteAll<T>(this IDbCommand dbCmd, IEnumerable<T> rows)
+        {
+            var ids = rows.Map(x => x.GetId());
+            return dbCmd.DeleteByIds<T>(ids);
+        }
+
         internal static int DeleteAll(this IDbCommand dbCmd, Type tableType)
         {
             return dbCmd.ExecuteSql(dbCmd.GetDialectProvider().ToDeleteStatement(tableType, null));

tests/ServiceStack.OrmLite.Tests/OrmLiteDeleteTests.cs

@@ -28,6 +28,25 @@ public void TearDown()
             db.Dispose();
         }
 
+	    [Test]
+	    public void Can_delete_all_rows()
+	    {
+            var row1 = ModelWithFieldsOfDifferentTypes.Create(1);
+            var row2 = ModelWithFieldsOfDifferentTypes.Create(2);
+            var row3 = ModelWithFieldsOfDifferentTypes.Create(3);
+
+            db.Save(row1);
+            db.Save(row2);
+            db.Save(row3);
+
+	        db.DeleteAll(new[] {row1, row3});
+
+	        var remaining = db.Select<ModelWithFieldsOfDifferentTypes>();
+
+            Assert.That(remaining.Count, Is.EqualTo(1));
+            Assert.That(remaining[0].Id, Is.EqualTo(row2.Id));
+        }
+
 		[Test]
 		public void Can_Delete_from_ModelWithFieldsOfDifferentTypes_table()
 		{