Filter Datasource in form

Class Declaration of Form : QueryBuildRange qbrYear, qbrMake, qbrModel;

Data Source Init method public void init() {     super();     qbrYear =   this.query().dataSourceName('FitmentGuide').addRange(fieldNum(FitmentGuide,Year));     qbrMake =   this.query().dataSourceName('FitmentGuide').addRange(fieldNum(FitmentGuide,Make));     qbrModel =   this.query().dataSourceName('FitmentGuide').addRange(fieldNum(FitmentGuide,Model)); }

Data Source Execute Query public void executeQuery() {     if(YearFilter.valueStr())         qbrYear.value(queryValue(YearFilter.valueStr()));     else         qbrYear.value(queryValue(null));     if(MakeFilter.valuestr())         qbrMake.value(queryValue(MakeFilter.valuestr()));     else         qbrMake.value(queryValue(null));     if(ModelFilter.valuestr())         qbrModel.value(queryValue(ModelFilter.valuestr()));     else         qbrModel.value(queryValue(null));     super(); }

2nd Way : If you dont have  data source for which you want to keep range but it is related to the tables in form 

Class Declaration of Form : QueryBuildDataSource            qbrmatchingorders,qbrsalestable

Data source Init method ( to which you want to add relation and range) public void init() {     super();     qbrmatchingorders   =   MatchingOrders_q.dataSourceTable(tableNum(MatchingOrders));     qbrsalestable   =   qbrmatchingorders.addDataSource(tableNum(SalesTable));     qbrsalestable.joinMode(JoinMode::ExistsJoin);     qbrsalestable.relations(true); }

Data Source Execute Query public void executeQuery() {     QueryBuildRange                 qbrmatchbackkeycode;     qbrmatchbackkeycode = qbrsalestable.addRange(fieldNum(SalesTable,MatchbackKeycode));     qbrmatchbackkeycode.value(queryValue(""));     super(); }