import { IExecuteFunctions } from 'n8n-core';
import {
IDataObject,
INodeExecutionData,
INodeType,
INodeTypeDescription,
NodeOperationError,
} from 'n8n-workflow';
import pgPromise from 'pg-promise';
import { pgInsert, pgQuery, pgUpdate } from './Postgres.node.functions';
export class Postgres implements INodeType {
description: INodeTypeDescription = {
displayName: 'Postgres',
name: 'postgres',
icon: 'file:postgres.svg',
group: ['input'],
version: 1,
description: 'Get, add and update data in Postgres',
defaults: {
name: 'Postgres',
},
inputs: ['main'],
outputs: ['main'],
credentials: [
{
name: 'postgres',
required: true,
},
],
properties: [
{
displayName: 'Operation',
name: 'operation',
type: 'options',
noDataExpression: true,
options: [
{
name: 'Execute Query',
value: 'executeQuery',
description: 'Execute an SQL query',
action: 'Execute a SQL query',
},
{
name: 'Insert',
value: 'insert',
description: 'Insert rows in database',
action: 'Insert rows in database',
},
{
name: 'Update',
value: 'update',
description: 'Update rows in database',
action: 'Update rows in database',
},
],
default: 'insert',
},
// ----------------------------------
// executeQuery
// ----------------------------------
{
displayName: 'Query',
name: 'query',
type: 'string',
typeOptions: {
alwaysOpenEditWindow: true,
},
displayOptions: {
show: {
operation: ['executeQuery'],
},
},
default: '',
placeholder: 'SELECT id, name FROM product WHERE quantity > $1 AND price <= $2',
required: true,
description: 'The SQL query to execute. You can use n8n expressions or $1 and $2 in conjunction with query parameters.',
},
// ----------------------------------
// 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: '',
// eslint-disable-next-line n8n-nodes-base/node-param-placeholder-miscased-id
placeholder: 'id:int,name:text,description',
// eslint-disable-next-line n8n-nodes-base/node-param-description-miscased-id
description: 'Comma-separated list of the properties which should used as columns for the new rows. You can use type casting with colons (:) like id:int.',
},
// ----------------------------------
// update
// ----------------------------------
{
displayName: 'Schema',
name: 'schema',
type: 'string',
displayOptions: {
show: {
operation: ['update'],
},
},
default: 'public',
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,
// eslint-disable-next-line n8n-nodes-base/node-param-description-miscased-id
description: 'Comma-separated list of the properties 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:text,description',
// eslint-disable-next-line n8n-nodes-base/node-param-description-miscased-id
description: 'Comma-separated list of the properties which should used as columns for rows to update. You can use type casting with colons (:) like id:int.',
},
// ----------------------------------
// insert,update
// ----------------------------------
{
displayName: 'Return Fields',
name: 'returnFields',
type: 'string',
displayOptions: {
show: {
operation: ['insert', 'update'],
},
},
default: '*',
description: 'Comma-separated list of the fields that the operation will return',
},
// ----------------------------------
// Additional fields
// ----------------------------------
{
displayName: 'Additional Fields',
name: 'additionalFields',
type: 'collection',
placeholder: 'Add Field',
default: {},
options: [
{
displayName: 'Mode',
name: 'mode',
type: 'options',
options: [
{
name: 'Independently',
value: 'independently',
description: 'Execute each query independently',
},
{
name: 'Multiple Queries',
value: 'multiple',
description: 'Default. Sends multiple queries at once to database.',
},
{
name: 'Transaction',
value: 'transaction',
description: 'Executes all queries in a single transaction',
},
],
default: 'multiple',
description: 'The way queries should be sent to database. Can be used in conjunction with Continue on Fail. See the docs for more examples',
},
{
displayName: 'Output Large-Format Numbers As',
name: 'largeNumbersOutput',
type: 'options',
options: [
{
name: 'Numbers',
value: 'numbers',
},
{
name: 'Text',
value: 'text',
description: 'Use this if you expect numbers longer than 16 digits (otherwise numbers may be incorrect)',
},
],
hint: 'Applies to NUMERIC and BIGINT columns only',
default: 'text',
},
{
displayName: 'Query Parameters',
name: 'queryParams',
type: 'string',
displayOptions: {
show: {
'/operation': [
'executeQuery',
],
},
},
default: '',
placeholder: 'quantity,price',
description: 'Comma-separated list of properties which should be used as query parameters',
},
],
},
],
};
async execute(this: IExecuteFunctions): Promise {
const credentials = await this.getCredentials('postgres');
const largeNumbersOutput = this.getNodeParameter('additionalFields.largeNumbersOutput', 0, '') as string;
const pgp = pgPromise();
if (largeNumbersOutput === 'numbers') {
pgp.pg.types.setTypeParser(20, (value: string) => {
return parseInt(value, 10);
});
pgp.pg.types.setTypeParser(1700, (value: string) => {
return parseFloat(value);
});
}
const config: IDataObject = {
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,
};
if (credentials.allowUnauthorizedCerts === true) {
config.ssl = {
rejectUnauthorized: false,
};
} else {
config.ssl = !['disable', undefined].includes(credentials.ssl as string | undefined);
config.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, this.continueOnFail());
returnItems = this.helpers.returnJsonArray(queryResult);
} else if (operation === 'insert') {
// ----------------------------------
// insert
// ----------------------------------
const insertData = await pgInsert(this.getNodeParameter, pgp, db, items, this.continueOnFail());
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, this.continueOnFail());
returnItems = this.helpers.returnJsonArray(updateItems);
} else {
await pgp.end();
throw new NodeOperationError(this.getNode(), `The operation "${operation}" is not supported!`);
}
// Close the connection
await pgp.end();
return this.prepareOutputData(returnItems);
}
}