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joplin/packages/lib/models/utils/paginatedFeed.ts

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import paginationToSql from './paginationToSql';
import { Pagination, PaginationOrder } from './types';
export interface ModelFeedPage {
items: any[];
has_more: boolean;
total?: number;
}
export interface WhereQuery {
sql: string;
params: any[];
}
// Note: this method might return more fields than was requested as it will
// also return fields that are necessary for pagination.
export default async function(db: any, tableName: string, pagination: Pagination, whereQuery: WhereQuery = null, fields: string[] = null): Promise<ModelFeedPage> {
fields = fields ? fields.slice() : ['id'];
const where = whereQuery ? [whereQuery.sql] : [];
const sqlParams = whereQuery && whereQuery.params ? whereQuery.params.slice() : [];
if (!pagination.order.length) throw new Error('Pagination order must be provided');
if (pagination.order.length > 1) throw new Error('Only one pagination order field can be provided');
const paginationOrder = pagination.order[0].dir;
if (!pagination.order.find((o: PaginationOrder) => o.by === 'id')) {
pagination = {
...pagination,
order: pagination.order.concat([{
by: 'id',
dir: paginationOrder,
caseInsensitive: false,
}]),
};
}
const orderBySql = paginationToSql(pagination);
const fieldsSql = fields.length ? db.escapeFields(fields) : '*';
const offset = (pagination.page - 1) * pagination.limit;
const sql = `
SELECT ${fieldsSql} FROM \`${tableName}\`
${where.length ? `WHERE ${where.join(' AND ')}` : ''}
ORDER BY ${orderBySql}
LIMIT ${pagination.limit}
OFFSET ${offset}
`;
// console.info('SQL', sql, sqlParams);
const rows = await db.selectAll(sql, sqlParams);
return {
items: rows,
has_more: rows.length >= pagination.limit,
};
}