@directus/api/dist/database/helpers/schema/dialects/mssql.js

Directus is a real-time API and App dashboard for managing SQL database content

import { getDefaultIndexName } from '../../../../utils/get-default-index-name.js';
import { SchemaHelper } from '../types.js';
import { prepQueryParams } from '../utils/prep-query-params.js';
export class SchemaHelperMSSQL extends SchemaHelper {
    generateIndexName(type, collection, fields) {
        return getDefaultIndexName(type, collection, fields, { maxLength: 128 });
    }
    applyLimit(rootQuery, limit) {
        // The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries,
        // and common table expressions, unless TOP, OFFSET or FOR XML is also specified.
        if (limit === -1) {
            rootQuery.limit(Number.MAX_SAFE_INTEGER);
        }
        else {
            rootQuery.limit(limit);
        }
    }
    applyOffset(rootQuery, offset) {
        rootQuery.offset(offset);
        rootQuery.orderBy(1);
    }
    formatUUID(uuid) {
        return uuid.toUpperCase();
    }
    async getDatabaseSize() {
        try {
            const result = await this.knex.raw('SELECT SUM(size) * 8192 AS size FROM sys.database_files;');
            return result[0]?.['size'] ? Number(result[0]?.['size']) : null;
        }
        catch {
            return null;
        }
    }
    prepQueryParams(queryParams) {
        return prepQueryParams(queryParams, { format: (index) => `@p${index}` });
    }
    addInnerSortFieldsToGroupBy(groupByFields, sortRecords, _hasRelationalSort) {
        /*
        MSSQL requires all selected columns that are not aggregated over are to be present in the GROUP BY clause

        > When the select list has no aggregations, each column in the select list must be included in the GROUP BY list.

        https://learn.microsoft.com/en-us/sql/t-sql/queries/select-group-by-transact-sql?view=sql-server-ver16#g-syntax-variations-for-group-by

        MSSQL does not support aliases in the GROUP BY clause

        > The column expression cannot contain:
            A column alias that is defined in the SELECT list. It can use a column alias for a derived table that is defined
            in the FROM clause.

        https://learn.microsoft.com/en-us/sql/t-sql/queries/select-group-by-transact-sql?view=sql-server-ver16
         */
        if (sortRecords.length > 0) {
            groupByFields.push(...sortRecords.map(({ column }) => column));
        }
    }
    getColumnNameMaxLength() {
        return 128;
    }
    getTableNameMaxLength() {
        return 128;
    }
}