Get qldb ledger table data in javascript object - node.js

Question

So my issue is simple yet challenging. I am trying to transfer data from one ledger to another. Now for that, I am reading a whole table of data then creating an object for every document than inserting these documents one by one into the other ledger table
Ledger#1 Table1 -> get all data -> convert all data to array of objects -> transfer to Ledger#2 Table1 one by one
The problem is that I cannot create the object from the document. I do this manually by using prototype functions and reading field type and then creating a thing that is messy and causes some data to become null. So I was wondering if there was a better way that is less prone to errors.
I asked a question of migrating ledger but had no luck in getting any response. Please help me in this.
Following is my code. Please copy and paste it inside an IDE so you can better understand
const getValueOfField = (field) => {
const name = field.getType().name;
switch (name) {
case "string":
return field.stringValue();
case "int":
return field.numberValue();
case "null":
return null;
default:
return null;
}
};
const enterDataInNewLedger = async (tableData, tableName) => {
const awsProductionDriver = awsProduction();
console.log(`Starting to insert data inside table ${tableName}`);
try {
for (const data of tableData) {
await awsProductionDriver.executeLambda(async (txn) => {
await txn.execute(`INSERT INTO ${tableName} ?`, data);
});
}
console.log(`Done inserting data inside ${tableName}`);
return { success: true };
} catch (err) {
console.log(err.message);
return { success: false, message: err.message };
}
};
const dataTransferOfTable = async (table) => {
const prodDriver = awsProd();
try {
const allTableData = await prodDriver.executeLambda(async (txn) => {
const result = await txn.execute(`SELECT * FROM ${table.name}`);
const resultList = result.getResultList();
let completeResults = [];
for (const doc of resultList) {
let newDoc = {};
const fields = doc.fields();
for (const field of fields) {
newDoc[field[0]] = getValueOfField(field[1]);
}
completeResults.push(newDoc);
}
return completeResults;
});
const response = await enterDataInNewLedger(allTableData, table.name);
checkForErrors(response);
return { success: true };
} catch (err) {
console.log(err.message);
return { success: false, message: err.message };
}
};
const startDataTransferFromOneLedgerToAnother = async () => {
try {
for (let table of tableName) {
const response = await dataTransferOfTable(table);
checkForErrors(response);
}
} catch (err) {
console.log(err.message);
}
};
startDataTransferFromOneLedgerToAnother();

Answer 1

So apparently I could've done this easily. I was just checking it and figured out the solution.
I can insert the whole fetched document and it will be same so my converted code is as follows
const { awsMainFunction: awsProd } = require("./awsProdConfig");
const { awsMainFunction: awsProduction } = require("./awsProductionConfig");
const { tableNamesAndIndeces: tableName, checkForErrors } = require("./utils");
const enterDataInNewLedger = async (tableData, tableName) => {
const awsProductionDriver = awsProduction();
console.log(`Starting to insert data inside table ${tableName}`);
try {
for (const data of tableData) {
await awsProductionDriver.executeLambda(async (txn) => {
await txn.execute(`INSERT INTO ${tableName} ?`, data);
});
}
console.log(`Done inserting data inside ${tableName}`);
return { success: true };
} catch (err) {
console.log(err.message);
return { success: false, message: err.message };
}
};
const dataTransferOfTable = async (table) => {
const prodDriver = awsProd();
try {
const allTableData = await prodDriver.executeLambda(async (txn) => {
const result = await txn.execute(`SELECT * FROM ${table.name}`);
return result.getResultList();
});
const response = await enterDataInNewLedger(allTableData, table.name);
checkForErrors(response);
return { success: true };
} catch (err) {
console.log(err.message);
return { success: false, message: err.message };
}
};
const startDataTransferFromOneLedgerToAnother = async () => {
try {
for (let table of tableName) {
const response = await dataTransferOfTable(table);
checkForErrors(response);
}
} catch (err) {
console.log(err.message);
}
};
startDataTransferFromOneLedgerToAnother();