# `PRO_ERPMERGEMFTWORKORDER` (procedure)


- **Type:** PROCEDURE
- **Deterministic:** NO
- **SQL data access:** CONTAINS SQL

## Parameters

| # | Mode | Name | Type |
|---|---|---|---|
| 1 | IN | `sSlaveId` | `varchar(100)` |
| 2 | OUT | `sErrorMsg` | `varchar(100)` |

## Body

_Body is not pre-cached. To inspect: `mysql --defaults-file=~/.my.cnf -e 'SHOW CREATE PROCEDURE `PRO_ERPMERGEMFTWORKORDER`'`._

## Narrative

**Business context:** Manufacturing — 生产施工单 (Work Order) reporting-row builder. Whenever a `MFTWORKORDERSLAVE` row is saved/checked, this proc rebuilds the corresponding fully-denormalized row in `ERPMERGEWORKORDER` — joining in customer, product, form, classification, tax, salesman, payment, and deliver labels — so downstream BI/reporting queries can scan a single wide table without re-joining the operational schema.

**What it does:** loads the slave row by `sSlaveId` into session variables, fetches its master via `@sParentId`, then conditionally fetches name labels from `ELECUSTOMER`, `ELEPRODUCT`, `GDSMODULE`, `SISCUSTOMERCLASSIFY`, `SISTAX`, `SISPRODUCTCLASSIFY`, `SISSALESMAN`, `SISPAYMENT`, `SISDELIVER`. Inside a transaction it `DELETE`s any existing `ERPMERGEWORKORDER` row by `sSlaveId` and `INSERT`s the freshly composed denormalized row.

**Invocation:** Called by `ProDao.proErpMergeMftWorkOrder(map)` via MyBatis CALLABLE mapper `ProMapper.xml`, driven from `MegerWorkOrderServiceImpl` after a `MFTWORKORDERSLAVE` mutation event. Companion to `PRO_ERPMERGEPRODUCTIONREPORT` (production-report variant) and `PRO_ERPMERGESALSALESORDER` (sales-order variant). See [Cache invalidation on metadata change](../../reference/maintainer/cache-invalidation.md).

Caveat: `DELETE FROM ERPMERGEWORKORDER WHERE sSlaveId = sSlaveId` — the parameter name shadows the column name, so the predicate `sSlaveId = sSlaveId` is always true (or always-NULL-safe-true depending on optimizer). The DELETE deletes the whole table in each invocation. The INSERT then re-inserts only the current row — net behaviour is correct for a single-row rebuild, but the table gets rewritten on every call, which is destructive if any other live row exists. Worth a maintainer audit.