import { MysqlCfg } from '../interface';
export declare class MysqlClient {
    private cfg;
    private pool;
    constructor(config: MysqlCfg);
    closePool(): Promise<void>;
    /**
     * 执行 SQL 语句（通用方法）
     * @param {string} sql - SQL 语句
     * @param {array} params - SQL 参数（防止 SQL 注入）
     * @return {Promise} - 结果集
     */
    execute(sql: string, params?: Array<any>): Promise<any>;
    /**
     * 查询表信息
     * @param table
     */
    getTableInfo(table: string): Promise<{
        columns: {
            COLUMN_NAME: string;
            ORDINAL_POSITION: number;
            COLUMN_TYPE: string;
            IS_NULLABLE: string;
            COLUMN_DEFAULT: string;
            COLUMN_COMMENT: string;
        }[];
        indexes: {
            INDEX_NAME: string;
            COLUMN_NAME: string;
        }[];
    }>;
    queryOne(table: string, whereStr: string): Promise<any>;
    queryAll(table: string, whereStr: string): Promise<any[]>;
    /**
     * 获取可设置的列
     * 去掉 id updated_at created_at 三个约定字段
     * @param table
     * @private
     */
    private getSetAbleColumnNames;
    insert(table: string, record: any): Promise<any>;
    update(table: string, record: any, whereStr: string): Promise<any>;
    delete(table: string, whereStr: string): Promise<any>;
}