75 lines
1.9 KiB
TypeScript
75 lines
1.9 KiB
TypeScript
import { TABLE_NAMES } from './clickhouse/client';
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export interface SqlBuilderObject {
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where: Record<string, string>;
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having: Record<string, string>;
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select: Record<string, string>;
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groupBy: Record<string, string>;
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orderBy: Record<string, string>;
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from: string;
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joins: Record<string, string>;
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limit: number | undefined;
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offset: number | undefined;
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}
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export function createSqlBuilder() {
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const join = (obj: Record<string, string> | string[], joiner: string) =>
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Object.values(obj).filter(Boolean).join(joiner);
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const sb: SqlBuilderObject = {
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where: {},
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from: `${TABLE_NAMES.events} e`,
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select: {},
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groupBy: {},
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orderBy: {},
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having: {},
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joins: {},
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limit: undefined,
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offset: undefined,
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};
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const getWhere = () =>
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Object.keys(sb.where).length ? `WHERE ${join(sb.where, ' AND ')}` : '';
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const getHaving = () =>
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Object.keys(sb.having).length ? `HAVING ${join(sb.having, ' AND ')}` : '';
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const getFrom = () => `FROM ${sb.from}`;
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const getSelect = () =>
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`SELECT ${Object.keys(sb.select).length ? join(sb.select, ', ') : '*'}`;
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const getGroupBy = () =>
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Object.keys(sb.groupBy).length ? `GROUP BY ${join(sb.groupBy, ', ')}` : '';
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const getOrderBy = () =>
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Object.keys(sb.orderBy).length ? `ORDER BY ${join(sb.orderBy, ', ')}` : '';
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const getLimit = () => (sb.limit ? `LIMIT ${sb.limit}` : '');
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const getOffset = () => (sb.offset ? `OFFSET ${sb.offset}` : '');
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const getJoins = () =>
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Object.keys(sb.joins).length ? join(sb.joins, ' ') : '';
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return {
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sb,
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join,
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getWhere,
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getFrom,
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getSelect,
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getGroupBy,
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getOrderBy,
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getHaving,
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getJoins,
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getSql: () => {
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const sql = [
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getSelect(),
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getFrom(),
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getJoins(),
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getWhere(),
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getGroupBy(),
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getHaving(),
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getOrderBy(),
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getLimit(),
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getOffset(),
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]
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.filter(Boolean)
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.join(' ');
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return sql;
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},
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};
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}
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