Null values needs to be displayed in Mongo DB through POJO class - spring

Question

I have a Spring batch application written on top of spring boot framework, it is used to read data from oracle database(using JDBCcursorItemreader) and write to Mongo Database(MongoItemWriter).For each table i'm having a POJO class .Null value field not displaying in mongo collection.By default searilaization omitting the null value columns are omitting and displaying only the non null columns.
is there any other property to include the null fields in mongo DB?
ex: Oracle table
Mongo Collection:
{
"Name":"xyz",
"Number":"16"
}
Want below format:
{
"Name":"xyz",
"Number":"16",
"Date" : null
}
I want to display the date column in mongo DB.I have tried with jsoninclude properties.it is not working. Can anyone suggest on this?
My Code:
Batch File:
package com.sam.oracletomongo;
import java.util.ArrayList;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.JobRegistry;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepScope;
import org.springframework.batch.core.configuration.support.JobRegistryBeanPostProcessor;
import org.springframework.batch.core.job.builder.FlowBuilder;
import org.springframework.batch.core.job.flow.Flow;
import org.springframework.batch.core.job.flow.support.SimpleFlow;
import org.springframework.batch.core.launch.support.RunIdIncrementer;
import org.springframework.batch.core.partition.PartitionHandler;
import org.springframework.batch.core.partition.support.TaskExecutorPartitionHandler;
import org.springframework.batch.item.data.MongoItemWriter;
import org.springframework.batch.item.data.builder.MongoItemWriterBuilder;
import org.springframework.batch.item.database.JdbcCursorItemReader;
import org.springframework.batch.item.database.builder.JdbcCursorItemReaderBuilder;
import org.springframework.batch.item.database.support.ListPreparedStatementSetter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.core.task.SimpleAsyncTaskExecutor;
import org.springframework.core.task.TaskExecutor;
import org.springframework.data.mongodb.core.MongoTemplate;
#Configuration
#EnableBatchProcessing
#Import(AdditionalBatchConfiguration.class)
public class BABatchConfig {
#Autowired
public DataSource datasource;
#Autowired
public MongoTemplate mongotemplate;
#Autowired
public JobBuilderFactory jobBuilderFactory;
#Autowired
public StepBuilderFactory stepBuilderFactory;
#Bean
#StepScope
public JdbcCursorItemReader<BA> itemReaderBA(#Value("#{jobParameters[deltadate]}") String deltadate,#Value("#{jobParameters[rundate]}") String rundate) {
ListPreparedStatementSetter listPreparedStatementSetter = new ListPreparedStatementSetter();
List<String> l1=new ArrayList<String>();
l1.add(deltadate);
l1.add(rundate);
listPreparedStatementSetter.setParameters(l1);
return new JdbcCursorItemReaderBuilder<BA>()
.dataSource(datasource) // change accordingly if you use another data source
.name("fooReader")
.sql("SELECT SA_NO,SA_NAME,DATE1,DATE2,DATE3,ACTIVE FROM SAMPLE WHERE DATE2 between TO_DATE(?,'YYYY-MM-DD') and TO_DATE(?, 'YYYY-MM-DD')")
.rowMapper(new BARowMapper())
.preparedStatementSetter(listPreparedStatementSetter)
.build();
}
#Bean
public MongoItemWriter<BA> writerBA(MongoTemplate mongoTemplate) {
return new MongoItemWriterBuilder<BA>().template(mongoTemplate).collection("BA")
.build();
}
#Bean
public Job BAJob() {
return jobBuilderFactory.get("BA")
.incrementer(new CustomParametersIncrementerImpl(datasource))
.start(BAstep())
.build();
}
#Bean
public Step BAstep() {
return stepBuilderFactory.get("BAStep1")
.<BA, BA> chunk(10)
.reader(itemReaderBA(null,null))
.writer(writerBA(mongotemplate))
.build();
}
}
Model Class:
package com.sam.oracletomongo;
public class BA {
private String _id;
private String saNo;
private String saName;
private String Date1;
private String Date2;
private String Date3;
private String active;
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
public String getsaNo() {
return saNo;
}
public void setBaNo(String saNo) {
this.saNo = saNo;
}
public String getsaName() {
return saName;
}
public void setBaName(String saName) {
this.saName = saName;
}
public String getDate1() {
return Date1;
}
public void setDate1(String Date1) {
this.Date1 = Date1;
}
public String getDate2() {
return Date2;
}
public void setDate2(String Date2) {
this.Date2 = Date2;
}
public String getDate3() {
return Date3;
}
public void setDate3(String Date3) {
this.Date3 = Date3;
}
public String getActive() {
return active;
}
public void setActive(String active) {
this.active = active;
}
#Override
public String toString() {
return "BA [_id=" + _id + ", saNo=" + saNo + ", saName=" + saName + ", Date1=" + Date1 + ", Date2="
+ Date2 + ", Date3=" + Date3 + ", active=" + active + "]";
}
}
Mapper Class:
package com.sam.oracletomongo;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class BARowMapper implements RowMapper<BA> {
public BA mapRow(ResultSet rs, int rowNum) throws SQLException
{
BA ba = new BA();
String id=rs.getString("sA_NO");
ba.set_id(id);
ba.setsaNo(rs.getString("sA_NO"));
ba.setsaName(rs.getString("sA_NAME"));
ba.setDate1(rs.getString("DATE1"));
ba.setDate2(rs.getString("DATE2"));
ba.setDate3(rs.getString("DATE3"));
ba.setActive(rs.getString("ACTIVE"));
return ba;
}
}

Answer 1

This $project stage can help you:
{
"$project": {
_id: 0,
"name": 1,
"number": 1,
"Date": {
"$ifNull": [
"$Date", //If the Date field is not null
"null" //If the Date field is null write string 'null' to the field
]
}
}
}