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[FEATURE] Specify Column Order of Data for Copy Command #122

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[FEATURE] Specify Column Order of Data for Copy Command #122

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8 changes: 7 additions & 1 deletion src/DataReader.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ import {
MessageToDataReader,
MessageToDataWriter,
CopyStreamSerializableParams,
Table,
} from './Types';

/**
Expand Down Expand Up @@ -79,7 +80,12 @@ const populateTable = async (conv: Conversion, chunk: any): Promise<void> => {
const originalTableName: string = extraConfigProcessor.getTableName(conv, tableName, true);
const sql = `SELECT ${strSelectFieldList} FROM \`${originalTableName}\`;`;
const mysqlClient: PoolConnection = await DBAccess.getMysqlClient(conv);
const sqlCopy = `COPY "${conv._schema}"."${tableName}" FROM STDIN
// use dicTables to specify column order of data coming in
const tableMap = new Map<string, Table>(conv._config._dicTables);
let columnNames = '';
const table = tableMap.get(tableName);
if (table) columnNames = `(${table.arrTableColumns.map(c => `"${c.Field.toLowerCase()}"`).join()})`;
const sqlCopy = `COPY "${conv._schema}"."${tableName}" ${columnNames} FROM STDIN
WITH(FORMAT csv, DELIMITER '${conv._delimiter}',
ENCODING '${conv._targetConString.charset}');`;

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2 changes: 2 additions & 0 deletions src/StructureLoader.ts
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Expand Up @@ -135,5 +135,7 @@ export default async (conversion: Conversion): Promise<Conversion> => {
await log(conversion, message);
await Promise.all(processTablePromises);
await migrationStateManager.set(conversion, 'tables_loaded');
// make the table dictionary serializable for the DefaultReader
conversion._config._dicTables = [...conversion._dicTables];
return conversion;
};