n8n/packages/nodes-base/nodes/TimescaleDb/TimescaleDb.node.ts

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import {
IExecuteFunctions,
} from 'n8n-core';
import {
IDataObject,
INodeExecutionData,
INodeType,
INodeTypeDescription,
} from 'n8n-workflow';
import {
getItemCopy,
pgInsert,
pgQuery,
pgUpdate,
} from '../Postgres/Postgres.node.functions';
import * as pgPromise from 'pg-promise';
export class TimescaleDb implements INodeType {
description: INodeTypeDescription = {
displayName: 'TimescaleDB',
name: 'timescaleDb',
icon: 'file:timescale.svg',
group: ['input'],
version: 1,
description: 'Add and update data in TimescaleDB',
defaults: {
name: 'TimescaleDB',
color: '#fdb515',
},
inputs: ['main'],
outputs: ['main'],
credentials: [
{
name: 'timescaleDb',
required: true,
},
],
properties: [
{
displayName: 'Operation',
name: 'operation',
type: 'options',
options: [
{
name: 'Execute Query',
value: 'executeQuery',
description: 'Execute an SQL query',
},
{
name: 'Insert',
value: 'insert',
description: 'Insert rows in database',
},
{
name: 'Update',
value: 'update',
description: 'Update rows in database',
},
],
default: 'insert',
description: 'The operation to perform.',
},
// ----------------------------------
// executeQuery
// ----------------------------------
{
displayName: 'Query',
name: 'query',
type: 'string',
typeOptions: {
rows: 5,
},
displayOptions: {
show: {
operation: [
'executeQuery',
],
},
},
default: '',
placeholder: 'SELECT id, name FROM product WHERE id < 40',
required: true,
description: 'The SQL query to execute.',
},
// ----------------------------------
// insert
// ----------------------------------
{
displayName: 'Schema',
name: 'schema',
type: 'string',
displayOptions: {
show: {
operation: [
'insert',
],
},
},
default: 'public',
required: true,
description: 'Name of the schema the table belongs to',
},
{
displayName: 'Table',
name: 'table',
type: 'string',
displayOptions: {
show: {
operation: [
'insert',
],
},
},
default: '',
required: true,
description: 'Name of the table in which to insert data to.',
},
{
displayName: 'Columns',
name: 'columns',
type: 'string',
displayOptions: {
show: {
operation: [
'insert',
],
},
},
default: '',
placeholder: 'id,name,description',
description:
'Comma separated list of the properties which should used as columns for the new rows.',
},
{
displayName: 'Return Fields',
name: 'returnFields',
type: 'string',
displayOptions: {
show: {
operation: [
'insert',
],
},
},
default: '*',
description: 'Comma separated list of the fields that the operation will return',
},
// ----------------------------------
// update
// ----------------------------------
{
displayName: 'Schema',
name: 'schema',
type: 'string',
displayOptions: {
show: {
operation: [
'update',
],
},
},
default: 'public',
required: true,
description: 'Name of the schema the table belongs to',
},
{
displayName: 'Table',
name: 'table',
type: 'string',
displayOptions: {
show: {
operation: [
'update',
],
},
},
default: '',
required: true,
description: 'Name of the table in which to update data in',
},
{
displayName: 'Update Key',
name: 'updateKey',
type: 'string',
displayOptions: {
show: {
operation: [
'update',
],
},
},
default: 'id',
required: true,
description:
'Name of the property which decides which rows in the database should be updated. Normally that would be "id".',
},
{
displayName: 'Columns',
name: 'columns',
type: 'string',
displayOptions: {
show: {
operation: [
'update',
],
},
},
default: '',
placeholder: 'name,description',
description:
'Comma separated list of the properties which should used as columns for rows to update.',
},
],
};
async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
const credentials = this.getCredentials('timescaleDb');
if (credentials === undefined) {
throw new Error('No credentials got returned!');
}
const pgp = pgPromise();
const config = {
host: credentials.host as string,
port: credentials.port as number,
database: credentials.database as string,
user: credentials.user as string,
password: credentials.password as string,
ssl: !['disable', undefined].includes(credentials.ssl as string | undefined),
sslmode: (credentials.ssl as string) || 'disable',
};
const db = pgp(config);
let returnItems = [];
const items = this.getInputData();
const operation = this.getNodeParameter('operation', 0) as string;
if (operation === 'executeQuery') {
// ----------------------------------
// executeQuery
// ----------------------------------
const queryResult = await pgQuery(this.getNodeParameter, pgp, db, items);
returnItems = this.helpers.returnJsonArray(queryResult as IDataObject[]);
} else if (operation === 'insert') {
// ----------------------------------
// insert
// ----------------------------------
const [insertData, insertItems] = await pgInsert(this.getNodeParameter, pgp, db, items);
// Add the id to the data
for (let i = 0; i < insertData.length; i++) {
returnItems.push({
json: {
...insertData[i],
},
});
}
} else if (operation === 'update') {
// ----------------------------------
// update
// ----------------------------------
const updateItems = await pgUpdate(this.getNodeParameter, pgp, db, items);
returnItems = this.helpers.returnJsonArray(updateItems);
} else {
await pgp.end();
throw new Error(`The operation "${operation}" is not supported!`);
}
// Close the connection
await pgp.end();
return this.prepareOutputData(returnItems);
}
}