public static BulkMergeResult <T> BulkMerge <T>(this DbContext context, IEnumerable <T> entities, BulkMergeOptions <T> options) { int rowsAffected = 0; var outputRows = new List <BulkMergeOutputRow <T> >(); var tableMapping = context.GetTableMapping(typeof(T)); var dbConnection = context.GetSqlConnection(); int rowsInserted = 0; int rowsUpdated = 0; int rowsDeleted = 0; if (dbConnection.State == ConnectionState.Closed) { dbConnection.Open(); } using (var transaction = dbConnection.BeginTransaction()) { try { string stagingTableName = GetStagingTableName(tableMapping, options.UsePermanentTable, dbConnection); string destinationTableName = string.Format("[{0}].[{1}]", tableMapping.Schema, tableMapping.TableName); string[] columnNames = tableMapping.Columns.Where(o => !o.Column.IsStoreGeneratedIdentity).Select(o => o.Column.Name).ToArray(); string[] storeGeneratedColumnNames = tableMapping.Columns.Where(o => o.Column.IsStoreGeneratedIdentity).Select(o => o.Column.Name).ToArray(); SqlUtil.CloneTable(destinationTableName, stagingTableName, null, dbConnection, transaction, Common.Constants.Guid_ColumnName); var bulkInsertResult = BulkInsert(entities, options, tableMapping, dbConnection, transaction, stagingTableName, null, SqlBulkCopyOptions.KeepIdentity, true); IEnumerable <string> columnsToInsert = columnNames.Where(o => !options.GetIgnoreColumnsOnInsert().Contains(o)); IEnumerable <string> columnstoUpdate = columnNames.Where(o => !options.GetIgnoreColumnsOnUpdate().Contains(o)).Select(o => string.Format("t.{0}=s.{0}", o)); List <string> columnsToOutput = new List <string> { "$Action", string.Format("{0}.{1}", "s", Constants.Guid_ColumnName) }; List <PropertyInfo> propertySetters = new List <PropertyInfo>(); Type entityType = typeof(T); foreach (var storeGeneratedColumnName in storeGeneratedColumnNames) { //columnsToOutput.Add(string.Format("deleted.[{0}]", storeGeneratedColumnName)); Not Yet Supported columnsToOutput.Add(string.Format("inserted.[{0}]", storeGeneratedColumnName)); var storedGeneratedColumn = tableMapping.Columns.First(o => o.Column.Name == storeGeneratedColumnName); propertySetters.Add(entityType.GetProperty(storeGeneratedColumnName)); } string mergeSqlText = string.Format("MERGE {0} t USING {1} s ON ({2}) WHEN NOT MATCHED BY TARGET THEN INSERT ({3}) VALUES ({3}) WHEN MATCHED THEN UPDATE SET {4} OUTPUT {5};", destinationTableName, stagingTableName, options.MergeOnCondition.ToSqlPredicate("s", "t"), SqlUtil.ConvertToColumnString(columnsToInsert), SqlUtil.ConvertToColumnString(columnstoUpdate), SqlUtil.ConvertToColumnString(columnsToOutput) ); var bulkQueryResult = context.BulkQuery(mergeSqlText, dbConnection, transaction); rowsAffected = bulkQueryResult.RowsAffected; //var entitiesEnumerator = entities.GetEnumerator(); //entitiesEnumerator.MoveNext(); foreach (var result in bulkQueryResult.Results) { string action = (string)result[0]; int id = (int)result[1]; var entity = bulkInsertResult.EntityMap[id]; outputRows.Add(new BulkMergeOutputRow <T>(action, entity)); if (options.AutoMapOutputIdentity && entity != null) { for (int i = 2; i < result.Length; i++) { propertySetters[0].SetValue(entity, result[i]); } } if (action == SqlMergeAction.Insert) { rowsInserted++; } else if (action == SqlMergeAction.Update) { rowsUpdated++; } else if (action == SqlMergeAction.Detete) { rowsDeleted++; } } SqlUtil.DeleteTable(stagingTableName, dbConnection, transaction); //ClearEntityStateToUnchanged(context, entities); transaction.Commit(); } catch (Exception ex) { transaction.Rollback(); throw ex; } finally { dbConnection.Close(); } return(new BulkMergeResult <T> { Output = outputRows, RowsAffected = rowsAffected, RowsDeleted = rowsDeleted, RowsInserted = rowsInserted, RowsUpdated = rowsUpdated, }); } }
public static BulkMergeResult <T> BulkMerge <T>(this DbContext context, IEnumerable <T> entities, BulkMergeOptions <T> options) { return(InternalBulkMerge(context, entities, options)); }