import { type Connection } from './DB.js';
import { Entity } from './Entity.js';
import { ForeignKey, Primitive } from './Structures.js';
export declare class QueryBuilder {
    #private;
    constructor(entity: typeof Entity, fields: string[]);
    protected where(cond: string): this;
    protected param(...params: Primitive[]): this;
    filter(filters: Filter[], entity: typeof Entity): this;
    protected injectConditions(sql: string[]): void;
    protected fields(): string[];
    protected params(): Primitive[];
    protected conds(): string[];
    protected table(): string;
    protected entity(): typeof Entity;
}
export declare class SelectBuilder extends QueryBuilder {
    #private;
    constructor(entity: typeof Entity, fields: string);
    order(order: string): this;
    join(master: SelectBuilder, relationship: ForeignKey): this;
    count(): this;
    chains(): Chain[];
    execute(db: Connection): Promise<any>;
}
export declare class UpdateBuilder extends QueryBuilder {
    constructor(entity: Entity, fields: string[]);
    execute(db: Connection): Promise<any>;
}
export type Filter = FilterIn | FilterVar | FilterVal;
export type FilterIn = {
    col: string;
    in: Primitive[];
};
export type FilterVar = {
    col: string;
    op?: Op;
    var: Primitive;
};
export type FilterVal = {
    col: string;
    op?: Op;
    val: Primitive;
};
export type Op = "=" | "<" | ">" | "<=" | ">=" | "<>" | "!=" | "IS" | "IS NOT" | "NOT";
export type Chain = {
    readonly parent: typeof Entity;
    readonly child: typeof Entity;
};