How to read a ARRAY of types returned from a stored proc using java?

Question 1

Answered after lot many trial and errors with different approaches. After trying to implement lot many solutions the Callable statement worked for me. Looks like a workaround, but any solution to resolve the actual implementation is welcome.

Please find below the working copy of the implementation.

import java.math.BigDecimal;
import java.sql.Array;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.sql.DataSource;

import oracle.jdbc.OracleTypes;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.STRUCT;

import org.apache.log4j.Logger;
import org.springframework.jdbc.core.SqlOutParameter;
import org.springframework.jdbc.core.SqlParameter;
import org.springframework.jdbc.object.StoredProcedure;

import com.****.****.****.ExcelListenerBean;
import com.****.****.****.RevAppViewBean;

public class RevPrdBrkDwnSP extends StoredProcedure{

    private final Logger log = Logger.getLogger(this.getClass().getName());

    private  Connection con = null;
    private DataSource ds = null;

    public RevPrdBrkDwnSP(DataSource dataSource, String storeProcName) throws SQLException {

        // Run the Parent
        super(dataSource, storeProcName);

        con = dataSource.getConnection();
        ds = dataSource;

        if (log.isInfoEnabled()) {
            log.info("Stored Procedure Name : "+ storeProcName);
        }
        // Declare the Parameter Details
        declareParameter(new SqlParameter("IN_ARRAY", OracleTypes.ARRAY, "****.PROD_PRCT_BRKDWN_TYPE_ARRAY"));
        declareParameter(new SqlOutParameter("OUT_ARRAY", OracleTypes.ARRAY, "****.PROD_PRCT_BRKDWN_TYPE_ARRAY"));

        // Compile the SP
        compile();
    }


    public List<ExcelListenerBean> execute(final RevAppViewBean appViewBean$Session, DataSource dataSource) throws Exception {
        dataSource = ds;
        List<ExcelListenerBean> beans = new ArrayList<ExcelListenerBean>();

        log.info("Setting up the Store Procedure Params");

        String getDBUSERByUserIdSql = "{call ****.PRCS_PROD_PRCT_BRKDWN_ENTRIES(?,?)}";
        CallableStatement cs = con.prepareCall(getDBUSERByUserIdSql);

        ArrayDescriptor des = ArrayDescriptor.createDescriptor("PBAREV.PROD_PRCT_BRKDWN_TYPE_ARRAY", con);
        ARRAY a = new ARRAY(des, con, appViewBean$Session.getExcelRecLst().toArray());
        cs.setObject(1, (Object)a);

        cs.registerOutParameter(2, OracleTypes.ARRAY, "****.PROD_PRCT_BRKDWN_TYPE_ARRAY");

        if (log.isDebugEnabled()) {
            log.debug("Executing the PBAREV Store Procedure ");
        }

        cs.execute();
        log.info("Executed ****.PRCS_PROD_PRCT_BRKDWN_ENTRIES... Processing values to beans"); 

        Array arr = cs.getArray(2);

        Object[] objArr = (Object[]) arr.getArray();
        for(int i=0; i<objArr.length;i++){
            STRUCT st = (STRUCT)objArr[i];
            ExcelListenerBean bean = new ExcelListenerBean();
            Object[] obj = st.getAttributes();
            bean.setPrntGdwIdN(((BigDecimal)obj[1]).longValue());
            bean.setChldGdwIdN(((BigDecimal)obj[2]).longValue());
            bean.setChldAsetPrcntN(Double.valueOf(String.valueOf(obj[4])));
            bean.setStatus(String.valueOf(obj[8]));
            bean.setStatusMessage(String.valueOf(obj[9]));
            beans.add(bean);
        }

        if (log.isDebugEnabled()) {
            log.info("Finised processing SP output values to ExcelListenerBeans");
        }

        return beans;
    }
}

Question 2

On the Oracle side, your code could look like this:

Global type delcration:

CREATE OR REPLACE TYPE NUM_ARRAY AS TABLE OF NUMBER;

Stored procedure:

CREATE OR REPLACE PROCEDURE PROD_PRCT_BRKDWN_TYPE_ARRAY (
   in_array    IN     NUM_ARRAY,
   out_status  OUT    VARCHAR2)
IS
...

Plain JDBC code (with some Oracle specific parts):

Connection con = ...;
CallableStatementcs = con.prepareCall(" ... ");
ArrayDescriptor des = ArrayDescriptor.createDescriptor("PBAREV.PROD_PRCT_BRKDWN_TYPE_ARRAY", con);

Integer[] idArray = new Integer[50000];

// fill the array of integers here
for (int i = 0; i < idArray.length; i++)
    idArray[i] = ....;

ARRAY a = new ARRAY(des, con, idArray);
cs.setObject(1, (Object)a);
cs.registerOutParameter(2, OracleTypes.ARRAY, "PBAREV.PROD_PRCT_BRKDWN_TYPE_ARRAY");

cs.execute();

ARRAY outArray = (ARRAY)cs.getArray(2);
Integer[] idOutArraz = (Integer[])outArray.getArray();

I haven't tested the code. But it should give you an idea.

Update:

For the conversion to the Spring Framework, you might want to look at the Spring Data JDBC Extension project that contains the class org.springframework.data.jdbc.support.oracle.SqlReturnArray and declare you parameter like this:

declareParameter(new SqlOutParameter("OUT_ARRAY", Types.ARRAY,
    "PBAREV.PROD_PRCT_BRKDWN_TYPE_ARRAY", new SqlReturnArray()));

I wonder what the Map of the execute method contains for the out array because the documentation doesn't say anything.