import { Entity } from '@loopback/repository';
import { ModelConstructor } from '@sourceloop/core';
import { DatabaseSchema, DbQueryConfig, IDbConnector } from '../types';
export declare class DbSchemaHelperService {
    private readonly connector;
    private readonly config;
    constructor(connector: IDbConnector, config: DbQueryConfig);
    getTablesContext(schema: DatabaseSchema): string[];
    asString(schema: DatabaseSchema): string;
    computeHash(schema: DatabaseSchema): string;
    modelToSchema(schema: string, models: ModelConstructor<Entity>[]): DatabaseSchema;
    private getForeignKeys;
    private _addHasManyThrough;
    private _addBelongsTo;
    private _isBelongsTo;
    private _isHasManyThrough;
    private hashTable;
    private _defaultKeyTo;
    private _defaultKeyFrom;
    private _pascalCase;
    private _getColumnName;
}