#ctx.dataSourceManager

dataSourceManager: DataSourceManager;

class DataSourceManager {
  constructor();

  // 数据源管理
  addDataSource(ds: DataSource | DataSourceOptions): void;
  upsertDataSource(ds: DataSource | DataSourceOptions): void;
  removeDataSource(key: string): void;
  clearDataSources(): void;

  // 读取数据源
  getDataSources(): DataSource[];                     // 获取所有数据源
  getDataSource(key: string): DataSource | undefined;  // 按 key 获取数据源

  // 按数据源 + 数据表直接访问元数据
  getCollection(dataSourceKey: string, collectionName: string): Collection | undefined;
  getCollectionField(fieldPathWithDataSource: string): CollectionField | undefined;
}

// 获取名为 'main' 的数据源
const mainDS = ctx.dataSourceManager.getDataSource('main');

// 获取该数据源下所有数据表
const collections = mainDS?.getCollections();

// 按 dataSourceKey + collectionName 获取数据表
const users = ctx.dataSourceManager.getCollection('main', 'users');
const orders = ctx.dataSourceManager.getCollection('main', 'orders');

// 获取数据表主键
const primaryKey = users?.filterTargetKey ?? 'id';

// 格式：dataSourceKey.collectionName.fieldPath
// 按「数据源.key.数据表.字段路径」获取字段定义
const field = ctx.dataSourceManager.getCollectionField('main.users.profile.avatar');

// 支持关联字段路径
const userNameField = ctx.dataSourceManager.getCollectionField('main.orders.createdBy.name');

const dataSources = ctx.dataSourceManager.getDataSources();
for (const ds of dataSources) {
  ctx.logger.info(`数据源: ${ds.key}, 显示名: ${ds.displayName}`);
  const collections = ds.getCollections();
  for (const col of collections) {
    ctx.logger.info(`  - 数据表: ${col.name}`);
  }
}

const dsKey = ctx.getVar('dataSourceKey') ?? 'main';
const collectionName = ctx.getVar('collectionName') ?? 'users';
const col = ctx.dataSourceManager.getCollection(dsKey, collectionName);
if (col) {
  const fields = col.getFields();
  // ...
}