public string DeleteAftSource(SqlRelationModel model)
 {
     model.FilterFunction = (item) => { return(model.SourceColumn(item)); };
     return(DeleteAftRule(model, model.AfterTables));
 }
 public string DeletePreSource(SqlRelationModel model)
 {
     model.FilterFunction = (item) => { return(model.SourceColumn(item)); };
     return(DeletePreRule(model, model.PreTable));
 }