first commit

packages/nodes-base/nodes/Oracle/Sql/actions/database/select.operation.ts

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+import type {
+	IDataObject,
+	IExecuteFunctions,
+	INodeExecutionData,
+	INodeProperties,
+} from 'n8n-workflow';
+import type * as oracleDBTypes from 'oracledb';
+
+import { updateDisplayOptions } from '@utils/utilities';
+
+import type {
+	OracleDBNodeOptions,
+	QueriesRunner,
+	QueryWithValues,
+	SortRule,
+	WhereClause,
+} from '../../helpers/interfaces';
+import {
+	addSortRules,
+	addWhereClauses,
+	quoteSqlIdentifier,
+	getColumnMap,
+	getColumnMetaData,
+} from '../../helpers/utils';
+import {
+	combineConditionsCollection,
+	optionsCollection,
+	sortFixedCollection,
+	whereFixedCollection,
+} from '../common.descriptions';
+
+const properties: INodeProperties[] = [
+	{
+		displayName: 'Return All',
+		name: 'returnAll',
+		type: 'boolean',
+		default: false,
+		description: 'Whether to return all results or only up to a given limit',
+		displayOptions: {
+			show: {
+				resource: ['database'],
+				operation: ['select'],
+			},
+		},
+	},
+	{
+		displayName: 'Limit',
+		name: 'limit',
+		type: 'number',
+		default: 50,
+		description: 'Max number of results to return',
+		typeOptions: {
+			minValue: 1,
+		},
+		displayOptions: {
+			show: {
+				resource: ['database'],
+				operation: ['select'],
+				returnAll: [false],
+			},
+		},
+	},
+	whereFixedCollection,
+	combineConditionsCollection,
+	sortFixedCollection,
+	...optionsCollection,
+];
+
+const displayOptions = {
+	show: {
+		resource: ['database'],
+		operation: ['select'],
+	},
+	hide: {
+		table: [''],
+	},
+};
+
+export const description = updateDisplayOptions(displayOptions, properties);
+
+export async function execute(
+	this: IExecuteFunctions,
+	runQueries: QueriesRunner,
+	items: INodeExecutionData[],
+	nodeOptions: OracleDBNodeOptions,
+	pool: oracleDBTypes.Pool,
+): Promise<INodeExecutionData[]> {
+	const queries: QueryWithValues[] = [];
+
+	const conn = await pool.getConnection();
+	const isCDBSupported = conn.oracleServerVersion >= 1200000000;
+	await conn.close();
+
+	for (let i = 0; i < items.length; i++) {
+		const schema = this.getNodeParameter('schema', i, undefined, {
+			extractValue: true,
+		}) as string;
+
+		const table = this.getNodeParameter('table', i, undefined, {
+			extractValue: true,
+		}) as string;
+
+		const tableSchema = await getColumnMetaData(this.getNode(), pool, schema, table, i);
+		const columnMetaDataObject = getColumnMap(tableSchema);
+		let values: any = [];
+		const outputColumns = this.getNodeParameter('options.outputColumns', i, ['*']) as string[];
+
+		let query = '';
+		let innerQuery = outputColumns.includes('*')
+			? `SELECT * FROM ${quoteSqlIdentifier(schema)}.${quoteSqlIdentifier(table)}`
+			: `SELECT ${outputColumns.map(quoteSqlIdentifier).join(',')} FROM ${quoteSqlIdentifier(schema)}.${quoteSqlIdentifier(table)}`;
+
+		// Add WHERE clause
+		const whereClauses =
+			((this.getNodeParameter('where', i, []) as IDataObject).values as WhereClause[]) || [];
+		const combineConditions = this.getNodeParameter('combineConditions', i, 'AND') as string;
+		[innerQuery, values] = addWhereClauses(
+			innerQuery,
+			whereClauses,
+			combineConditions,
+			columnMetaDataObject,
+		);
+
+		// Add ORDER BY if needed
+		const sortRules =
+			((this.getNodeParameter('sort', i, []) as IDataObject).values as SortRule[]) || [];
+		innerQuery = addSortRules(innerQuery, sortRules);
+
+		// Handle LIMIT / pagination
+		const returnAll = this.getNodeParameter('returnAll', i, false);
+		if (!returnAll) {
+			const limit = this.getNodeParameter('limit', i, 50);
+
+			if (isCDBSupported) {
+				// Oracle 12c+ (FETCH FIRST)
+				query += `${innerQuery} FETCH FIRST ${limit} ROWS ONLY`;
+			} else {
+				if (sortRules.length > 0 || whereClauses.length > 0) {
+					// Wrap inner query to preserve WHERE + ORDER BY
+					query = `SELECT * FROM (${innerQuery}) WHERE ROWNUM <= ${limit}`;
+				} else {
+					// No ORDER BY or WHERE: safe to append ROWNUM inline
+					query = `${innerQuery} WHERE ROWNUM <= ${limit}`;
+				}
+			}
+		} else {
+			// return all: no limit
+			query = innerQuery;
+		}
+
+		const queryWithValues = { query, values };
+		queries.push(queryWithValues);
+	}
+
+	return await runQueries(queries, items, nodeOptions);
+}