BE/src/oracle/uscib-managed-sp/carnet-sequence/carnet-sequence.service.ts

import { Injectable } from '@nestjs/common';
import * as oracledb from 'oracledb';
import { OracleDBService } from 'src/db/db.service';
import { CreateCarnetSequenceDTO, GetCarnetSequenceDTO } from './carnet-sequence.dto';

@Injectable()
export class CarnetSequenceService {

    constructor(private readonly oracleDBService:OracleDBService){}

    async createCarnetSequence(body:CreateCarnetSequenceDTO) {
        let connection;
        try {
            connection = await this.oracleDBService.getConnection()
            if (!connection) {
                throw new Error('No DB Connected')
            }

            const result = await connection.execute(
                `BEGIN
                   USCIB_Managed_Pkg.CreateCarnetSequence(
                    :p_spid,
                    :p_regionid,
                    :p_startnumber,
                    :p_endnumber,
                    :p_carnettype,
                    :p_cursor);
                 END;`, {
                p_spid: {
                    val: body.p_spid,
                    type: oracledb.DB_TYPE_NUMBER
                },
                p_regionid: {
                    val: body.p_regionid,
                    type: oracledb.DB_TYPE_NUMBER
                },
                p_startnumber: {
                    val: body.p_startnumber,
                    type: oracledb.DB_TYPE_NUMBER
                },
                p_endnumber: {
                    val: body.p_endnumber,
                    type: oracledb.DB_TYPE_NUMBER
                },
                p_carnettype: {
                    val: body.p_carnettype,
                    type: oracledb.DB_TYPE_VARCHAR
                },
                p_cursor: {
                    type: oracledb.CURSOR,
                    dir: oracledb.BIND_OUT
                }
            }, {
                outFormat: oracledb.OUT_FORMAT_OBJECT
            }
            );

            await connection.commit();

            let fres = await result.outBinds.p_cursor.getRows();

            await result.outBinds.p_cursor.close()

            return fres

        } catch (err) {
            
            return { error: err.message }
        } finally { }
    }

    async getCarnetSequence(body: GetCarnetSequenceDTO) {
        let connection;
        let rows = [];
        try {
            // Connect to the Oracle database using oracledb 
            connection = await this.oracleDBService.getConnection()
            if (!connection) {
                throw new Error('No DB Connected')
            }

            const result = await connection.execute(
                `BEGIN
                    USCIB_Managed_Pkg.GetCarnetSequence(:p_spid,:p_cursor);
                END;`,
                {
                    p_spid: {
                        val: body.p_spid,
                        type: oracledb.DB_TYPE_NUMBER,
                    },
                    p_cursor: {
                        type: oracledb.CURSOR,
                        dir: oracledb.BIND_OUT
                    }
                },
                {
                    outFormat: oracledb.OUT_FORMAT_OBJECT
                }
            );

            if (result.outBinds && result.outBinds.p_cursor) {
                const cursor = result.outBinds.p_cursor; 
                let rowsBatch;

                do {
                    rowsBatch = await cursor.getRows(100); // Fetch 100 rows at a time
                    rows = rows.concat(rowsBatch); 
                } while (rowsBatch.length > 0);

                
                await cursor.close();
            } else {
                throw new Error('No cursor returned from the stored procedure');
            }

            return rows;

        } catch (err) {
            
            return { error: err.message }
        } finally { }
    }
}