import { type BlockExecutor } from '../orchestration-schema.js';
/**
 * @serverBlockDoc
 * {
 *   "version": 1,
 *   "functionName": "schema",
 *   "displayName": "读取数据库结构",
 *   "category": "database",
 *   "description": "读取 datasource 当前默认 schema/database 的基础表和列信息。",
 *   "inputs": [
 *     { "key": "datasource", "type": "string", "required": true, "description": "数据源名称，对应 ${datasource}_DATABASE_URL。" }
 *   ],
 *   "outputs": [
 *     { "key": "tables", "type": "DatabaseSchemaTable[]", "description": "表结构数组，包含表名和列信息。" }
 *   ],
 *   "errors": [
 *     { "code": "BLOCK_DATABASE_TYPE_MISSING", "description": "执行器未获得数据库类型。" }
 *   ],
 *   "config": [],
 *   "runtime": [
 *     { "key": "requiresDatasource", "type": "boolean", "value": true, "description": "需要 datasource，并使用 information_schema 或 pg_catalog 查询结构。" }
 *   ],
 *   "examples": [
 *     { "title": "读取 Mokelay 数据库结构", "block": { "uuid": "schema_block", "functionName": "schema", "inputs": { "datasource": "Mokelay" }, "outputs": ["tables"], "nextBlock": null } }
 *   ]
 * }
 */
export declare const executeSchemaBlock: BlockExecutor;