/**
 * SQL Server 数据库适配器
 * 使用 mssql 驱动实现 DbAdapter 接口
 * 支持 SQL Server 2012+ 和 Azure SQL Database
 *
 * 性能优化：使用批量查询获取 Schema 信息，避免 N+1 查询问题
 */
import { BaseAdapter, ExecuteScriptOptions, TransactionContext } from './base.js';
import type { QueryResult, SchemaInfo } from '../types/adapter.js';
export declare class SQLServerAdapter extends BaseAdapter {
    private pool;
    private config;
    constructor(config: {
        host: string;
        port: number;
        user?: string;
        password?: string;
        database?: string;
        poolConfig?: {
            max?: number;
            min?: number;
            idleTimeoutMs?: number;
        };
    });
    /**
     * 连接到 SQL Server 数据库
     */
    connect(): Promise<void>;
    /**
     * 断开数据库连接
     */
    disconnect(): Promise<void>;
    /**
     * 执行 SQL 查询
     */
    executeQuery(query: string, params?: unknown[]): Promise<QueryResult>;
    /**
     * 获取数据库结构信息（批量查询优化版本）
     */
    getSchema(): Promise<SchemaInfo>;
    private makeTableKey;
    /**
     * 组装 Schema 信息
     */
    private assembleSchema;
    /**
     * 格式化 SQL Server 数据类型
     */
    private formatSQLServerType;
    /**
     * P0-3: Override withTransaction to pin all statements to a single physical connection
     * via mssql's Transaction API. Without this, BEGIN/COMMIT and individual statements
     * could end up on different pooled connections, breaking "all-or-nothing" semantics.
     *
     * mssql's transaction API is callback-based but returns a promise when called
     * without a callback, so we can use await directly.
     */
    withTransaction<T>(fn: (tx: TransactionContext) => Promise<T>): Promise<T>;
    /**
     * P0-3: Override executeScript to use withTransaction.
     * All statements run on a single connection so BEGIN/COMMIT are atomic.
     * Non-transactional mode falls back to the BaseAdapter default.
     */
    executeScript(query: string, options?: ExecuteScriptOptions): Promise<QueryResult>;
    /**
     * 检查是否为写操作
     */
    isWriteOperation(query: string): boolean;
    protected getDialect(): import('../utils/adapter-factory.js').DbType;
}
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