public static int BulkUpdate <T>(this DbContext context, IEnumerable <T> entities, BulkUpdateOptions <T> options) { int rowsUpdated = 0; var outputRows = new List <BulkMergeOutputRow <T> >(); var tableMapping = context.GetTableMapping(typeof(T)); var dbConnection = context.GetSqlConnection(); 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); BulkInsert(entities, options, tableMapping, dbConnection, transaction, stagingTableName, null, SqlBulkCopyOptions.KeepIdentity); IEnumerable <string> columnstoUpdate = columnNames.Where(o => !options.IgnoreColumnsOnUpdate.GetObjectProperties().Contains(o)); string updateSetExpression = string.Join(",", columnstoUpdate.Select(o => string.Format("t.{0}=s.{0}", o))); string updateOnExpression = string.Join(" AND ", storeGeneratedColumnNames.Select(o => string.Format("s.{0}=t.{0}", o))); string updateSql = string.Format("UPDATE t SET {0} FROM {1} AS s JOIN {2} AS t ON {3}; SELECT @@RowCount;", updateSetExpression, stagingTableName, destinationTableName, updateOnExpression); rowsUpdated = SqlUtil.ExecuteSql(updateSql, dbConnection, transaction); SqlUtil.DeleteTable(stagingTableName, dbConnection, transaction); //ClearEntityStateToUnchanged(context, entities); transaction.Commit(); } catch (Exception ex) { transaction.Rollback(); throw ex; } finally { dbConnection.Close(); } return(rowsUpdated); } }
public static int UpdateFromQuery <T>(this IQueryable <T> querable, Expression <Func <T, T> > updateExpression, BulkUpdateOptions <T> options) { int rowAffected = 0; var dbQuery = querable as DbQuery <T>; var dbConnection = GetSqlConnectionFromIQuerable(querable); //Open datbase connection if (dbConnection.State == ConnectionState.Closed) { dbConnection.Open(); } using (var dbTransaction = dbConnection.BeginTransaction()) { try { var sqlQuery = SqlQuery.Parse(dbQuery.Sql); string setSqlExpression = updateExpression.ToSqlUpdateSetExpression("Extent1"); sqlQuery.ChangeToUpdate("[Extent1]", setSqlExpression); rowAffected = SqlUtil.ExecuteSql(sqlQuery.Sql, dbConnection, dbTransaction, options); dbTransaction.Commit(); } catch (Exception ex) { dbTransaction.Rollback(); throw ex; } finally { dbConnection.Close(); } } return(rowAffected); }