删除一笔记录 Object].Delete()

下面的代码，删除FirstName为Tim,LastName为Brown的学生

DataManager dm = new DataManager(Config.Dsn);dm.QueryCriteria.Clear();dm.QueryCriteria.And(JoinPath.Student.Columns.FirstName,”Tim”)                .And(JoinPath.Student.Columns.LastName,”Brown”);Student s = dm.GetStudent(FetchPath.Student);s.Delete(); // marks the returned DataRow to be deleteddm.CommitAll();  // performs the necessary insert,update and delete operations

删除多行记录

DataManager dm = new DataManager(Config.Dsn);dm.QueryCriteria.And(JoinPath.Student.Columns.FirstName,"Tim")                      .And(JoinPath.Student.Columns.LastName,"Brown");StudentCollection students = dm.GetStudentCollection();// check to ensure that there are record(s) to deleteif (students != null) {         foreach (Student s in students)               s.Delete(); // loop through and mark for deletion         dm.CommitAll();  // Delete all datarows marked for deletion transitionally}

先取出数据到Collection中，再用object.Delete标记为删除，在CommitAll方法中执行删除记录

删除主从表记录 Delete Parent and Child record(s)

请看代码，先读取Brown学生的数据和它联系方式，之后再删除联系方式和Brown学生记录。

dm.QueryCriteria.Clear();dm.QueryCriteria.And(JoinPath.Student.Columns.LastName,"Brown");// Get[Object] will retrieve Student and related Contact recordsStudent student = dm.GetStudent(FetchPath.Student.Contact);student.Contact.Delete();      // mark the Parent Contact record to be deletedstudent.Delete();              // mark Student record Root object to be deleteddm.CommitAll();