import { TxnOption } from 'oak-domain/lib/types';
import { EntityDict, StorageSchema } from 'oak-domain/lib/types';
import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
import { PostgreSQLConfiguration } from './types/Configuration';
import { PostgreSQLTranslator } from './translator';
import { MigrationPlanningOptions, Plan, SchemaInspectionResult } from '../types/migration';
import type { Pool as PostgreSqlPool, PoolClient as PostgreSqlPoolClient, QueryResult as PostgreSqlQueryResult } from 'pg';
export declare class PostgreSQLConnector {
    pool?: PostgreSqlPool;
    configuration: PostgreSQLConfiguration;
    txnDict: Record<string, PostgreSqlPoolClient>;
    txnExecQueueDict: Record<string, Promise<void>>;
    constructor(configuration: PostgreSQLConfiguration);
    connect(): void;
    disconnect(): Promise<void>;
    startTransaction(option?: TxnOption): Promise<string>;
    /**
     * 映射隔离级别到 PostgreSQL 语法
     */
    private mapIsolationLevel;
    exec(sql: string, txn?: string): Promise<[Record<string, any>[], PostgreSqlQueryResult]>;
    private enqueueTxnQuery;
    private enqueueTxnTask;
    readSchema<ED extends EntityDict & BaseEntityDict>(translator: PostgreSQLTranslator<ED>): Promise<StorageSchema<ED>>;
    inspectSchema<ED extends EntityDict & BaseEntityDict>(translator: PostgreSQLTranslator<ED>): Promise<SchemaInspectionResult<ED>>;
    diffSchema<ED extends EntityDict & BaseEntityDict>(currentSchema: StorageSchema<ED>, targetSchema: StorageSchema<ED>, translator: PostgreSQLTranslator<ED>, options?: MigrationPlanningOptions): Plan<ED>;
    commitTransaction(txn: string): Promise<void>;
    rollbackTransaction(txn: string): Promise<void>;
    /**
     * 获取连接池状态
     */
    getPoolStatus(): {
        total: number;
        idle: number;
        waiting: number;
    };
}