mdb-reader/lib/browser/data/complex/utils.js

JavaScript library to read data from Access databases

import { Database } from "../../Database.js";
import { getComplexColumnsData } from "./complexColumnsData.js";
import { getMSysObjectsTable } from "../../systemTables.js";
import { maskTableId } from "../../util.js";
/**
 * Resolves (complexTypeId, tableDefinitionPage) to the flat table that stores
 * attachment rows for that complex column.
 * Throws if the system table is missing or no matching row is found.
 */
export function resolveFlatTableForComplexColumn(database, column) {
    const msysObjectsData = getMSysObjectsTable(database).getData({
        columns: ["Id", "Name"],
    });
    const complexColsData = getComplexColumnsData(database);
    const tableDefPageMasked = maskTableId(column.complex.tableDefinitionPage);
    for (const row of complexColsData) {
        const rowFlatTableId = row.FlatTableID;
        if (!rowFlatTableId) {
            continue;
        }
        const rowConceptualTableId = row.ConceptualTableID;
        const tableMatch = typeof rowConceptualTableId === "number" && rowConceptualTableId === tableDefPageMasked;
        if (!tableMatch) {
            continue;
        }
        const complexTypeIdMatch = typeof row.ComplexTypeObjectID === "number" && row.ComplexTypeObjectID === column.complex.typeId;
        const complexIdMatch = typeof row.ComplexID === "number" && row.ComplexID === column.complex.typeId;
        const columnNameMatch = typeof row.ColumnName === "string" && row.ColumnName.toLowerCase() === column.name.toLowerCase();
        if (!complexTypeIdMatch && !complexIdMatch && !columnNameMatch) {
            continue;
        }
        const flatTableId = maskTableId(rowFlatTableId);
        const flatTableRow = msysObjectsData.find((r) => maskTableId(r.Id) === flatTableId);
        if (!flatTableRow) {
            throw new Error(`Flat table not found for complex column ${column.name}`);
        }
        return {
            tableName: flatTableRow.Name,
            firstPage: flatTableId,
        };
    }
    throw new Error(`Flat table not found for complex column ${column.name}`);
}