/**
 * Shared SQL Adapter Helpers
 *
 * Used by both SqlAdapter and SqlTransactionAdapter.
 * Extracted from sql-adapter.ts — pure code movement.
 */
import type { LookupOptions, SqlDialect, UpdateOperators } from '../types.js';
export type ExecFn = (sqlStr: string, params?: unknown[]) => Promise<{
    rows: unknown[];
    rowCount: number;
}>;
export interface TxClient {
    query(sql: string, params?: unknown[]): Promise<{
        rows: unknown[];
        rowCount: number;
    }>;
}
/** Limit an UPDATE to a single row, dialect-aware. */
export declare function limitUpdateOne(baseSql: string, collection: string, whereClause: string, dialect: SqlDialect): string;
/** Limit a DELETE to a single row, dialect-aware. */
export declare function limitDeleteOne(baseSql: string, collection: string, whereClause: string, dialect: SqlDialect): string;
/** Perform upsert: UPDATE then INSERT if no rows matched. */
export declare function performUpsert(execFn: ExecFn, collection: string, filter: Record<string, unknown>, update: UpdateOperators<Record<string, unknown>>, dialect: SqlDialect): Promise<{
    rowCount: number;
    inserted: boolean;
}>;
/** Strip excluded fields from result rows. */
export declare function stripExcludedFields<T>(rows: T[], projection?: Record<string, 0 | 1>): T[];
/** Two-query lookup: query main table, then related table, nest results. */
export declare function performLookup<T>(execFn: ExecFn, collection: string, options: LookupOptions<T>, dialect: SqlDialect): Promise<T | null>;
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