import { EventEmitter } from 'events';
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import { type Parameter, type DataType } from './data-type';
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import Connection from './connection';
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import { type Metadata } from './metadata-parser';
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import { SQLServerStatementColumnEncryptionSetting } from './always-encrypted/types';
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import { type ColumnMetadata } from './token/colmetadata-token-parser';
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import { Collation } from './collation';
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/**
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* The callback is called when the request has completed, either successfully or with an error.
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* If an error occurs during execution of the statement(s), then `err` will describe the error.
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*
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* As only one request at a time may be executed on a connection, another request should not
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* be initiated until this callback is called.
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*
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* This callback is called before `requestCompleted` is emitted.
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*/
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type CompletionCallback =
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/**
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* @param error
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* If an error occurred, an error object.
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*
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* @param rowCount
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* The number of rows emitted as result of executing the SQL statement.
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*
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* @param rows
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* Rows as a result of executing the SQL statement.
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* Will only be available if [[ConnectionOptions.rowCollectionOnRequestCompletion]] is `true`.
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*/
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(error: Error | null | undefined, rowCount?: number, rows?: any) => void;
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export interface ParameterOptions {
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output?: boolean;
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length?: number;
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precision?: number;
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scale?: number;
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}
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interface RequestOptions {
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statementColumnEncryptionSetting?: SQLServerStatementColumnEncryptionSetting;
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}
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/**
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* ```js
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* const { Request } = require('tedious');
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* const request = new Request("select 42, 'hello world'", (err, rowCount) {
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* // Request completion callback...
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* });
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* connection.execSql(request);
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* ```
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*/
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declare class Request extends EventEmitter {
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/**
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* @private
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*/
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sqlTextOrProcedure: string | undefined;
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/**
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* @private
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*/
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parameters: Parameter[];
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/**
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* @private
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*/
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parametersByName: {
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[key: string]: Parameter;
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};
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/**
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* @private
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*/
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preparing: boolean;
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/**
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* @private
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*/
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canceled: boolean;
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/**
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* @private
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*/
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paused: boolean;
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/**
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* @private
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*/
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userCallback: CompletionCallback;
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/**
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* @private
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*/
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handle: number | undefined;
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/**
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* @private
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*/
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error: Error | undefined;
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/**
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* @private
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*/
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connection: Connection | undefined;
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/**
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* @private
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*/
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timeout: number | undefined;
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/**
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* @private
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*/
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rows?: Array<any>;
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/**
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* @private
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*/
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rst?: Array<any>;
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/**
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* @private
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*/
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rowCount?: number;
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/**
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* @private
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*/
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callback: CompletionCallback;
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shouldHonorAE?: boolean;
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statementColumnEncryptionSetting: SQLServerStatementColumnEncryptionSetting;
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cryptoMetadataLoaded: boolean;
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/**
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* This event, describing result set columns, will be emitted before row
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* events are emitted. This event may be emitted multiple times when more
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* than one recordset is produced by the statement.
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*
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* An array like object, where the columns can be accessed either by index
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* or name. Columns with a name that is an integer are not accessible by name,
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* as it would be interpreted as an array index.
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*/
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on(event: 'columnMetadata', listener: (columns: ColumnMetadata[] | {
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[key: string]: ColumnMetadata;
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}) => void): this;
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/**
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* The request has been prepared and can be used in subsequent calls to execute and unprepare.
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*/
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on(event: 'prepared', listener: () => void): this;
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/**
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* The request encountered an error and has not been prepared.
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*/
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on(event: 'error', listener: (err: Error) => void): this;
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/**
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* A row resulting from execution of the SQL statement.
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*/
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on(event: 'row', listener:
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/**
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* An array or object (depends on [[ConnectionOptions.useColumnNames]]), where the columns can be accessed by index/name.
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* Each column has two properties, `metadata` and `value`：
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*
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* * `metadata`
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*
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* The same data that is exposed in the `columnMetadata` event.
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*
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* * `value`
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*
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* The column's value. It will be `null` for a `NULL`.
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* If there are multiple columns with the same name, then this will be an array of the values.
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*/
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(columns: any) => void): this;
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/**
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* All rows from a result set have been provided (through `row` events).
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*
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* This token is used to indicate the completion of a SQL statement.
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* As multiple SQL statements can be sent to the server in a single SQL batch, multiple `done` can be generated.
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* An `done` event is emitted for each SQL statement in the SQL batch except variable declarations.
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* For execution of SQL statements within stored procedures, `doneProc` and `doneInProc` events are used in place of `done`.
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*
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* If you are using [[Connection.execSql]] then SQL server may treat the multiple calls with the same query as a stored procedure.
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* When this occurs, the `doneProc` and `doneInProc` events may be emitted instead. You must handle both events to ensure complete coverage.
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*/
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on(event: 'done', listener:
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/**
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* @param rowCount
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* The number of result rows. May be `undefined` if not available.
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*
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* @param more
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* If there are more results to come (probably because multiple statements are being executed), then `true`.
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*
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* @param rst
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* Rows as a result of executing the SQL statement.
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* Will only be available if Connection's [[ConnectionOptions.rowCollectionOnDone]] is `true`.
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*/
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(rowCount: number | undefined, more: boolean, rst?: any[]) => void): this;
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/**
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* `request.on('doneInProc', function (rowCount, more, rows) { });`
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*
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* Indicates the completion status of a SQL statement within a stored procedure. All rows from a statement
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* in a stored procedure have been provided (through `row` events).
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*
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* This event may also occur when executing multiple calls with the same query using [[execSql]].
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*/
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on(event: 'doneInProc', listener:
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/**
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* @param rowCount
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* The number of result rows. May be `undefined` if not available.
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*
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* @param more
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* If there are more results to come (probably because multiple statements are being executed), then `true`.
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*
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* @param rst
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* Rows as a result of executing the SQL statement.
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* Will only be available if Connection's [[ConnectionOptions.rowCollectionOnDone]] is `true`.
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*/
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(rowCount: number | undefined, more: boolean, rst?: any[]) => void): this;
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/**
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* Indicates the completion status of a stored procedure. This is also generated for stored procedures
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* executed through SQL statements.\
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* This event may also occur when executing multiple calls with the same query using [[execSql]].
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*/
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on(event: 'doneProc', listener:
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/**
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* @param rowCount
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* The number of result rows. May be `undefined` if not available.
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*
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* @param more
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* If there are more results to come (probably because multiple statements are being executed), then `true`.
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*
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* @param rst
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* Rows as a result of executing the SQL statement.
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* Will only be available if Connection's [[ConnectionOptions.rowCollectionOnDone]] is `true`.
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*/
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(rowCount: number | undefined, more: boolean, procReturnStatusValue: number, rst?: any[]) => void): this;
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/**
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* A value for an output parameter (that was added to the request with [[addOutputParameter]]).
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* See also `Using Parameters`.
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*/
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on(event: 'returnValue', listener:
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/**
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* @param parameterName
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* The parameter name. (Does not start with '@'.)
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*
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* @param value
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* The parameter's output value.
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*
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* @param metadata
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* The same data that is exposed in the `columnMetaData` event.
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*/
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(parameterName: string, value: unknown, metadata: Metadata) => void): this;
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/**
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* This event gives the columns by which data is ordered, if `ORDER BY` clause is executed in SQL Server.
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*/
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on(event: 'order', listener:
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/**
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* @param orderColumns
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* An array of column numbers in the result set by which data is ordered.
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*/
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(orderColumns: number[]) => void): this;
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on(event: 'requestCompleted', listener: () => void): this;
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on(event: 'cancel', listener: () => void): this;
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on(event: 'pause', listener: () => void): this;
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on(event: 'resume', listener: () => void): this;
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/**
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* @private
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*/
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emit(event: 'columnMetadata', columns: ColumnMetadata[] | {
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[key: string]: ColumnMetadata;
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}): boolean;
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/**
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* @private
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*/
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emit(event: 'prepared'): boolean;
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/**
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* @private
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*/
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emit(event: 'error', err: Error): boolean;
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/**
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* @private
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*/
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emit(event: 'row', columns: any): boolean;
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/**
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* @private
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*/
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emit(event: 'done', rowCount: number | undefined, more: boolean, rst?: any[]): boolean;
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/**
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* @private
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*/
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emit(event: 'doneInProc', rowCount: number | undefined, more: boolean, rst?: any[]): boolean;
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/**
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* @private
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*/
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emit(event: 'doneProc', rowCount: number | undefined, more: boolean, procReturnStatusValue: number, rst?: any[]): boolean;
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/**
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* @private
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*/
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emit(event: 'returnValue', parameterName: string, value: unknown, metadata: Metadata): boolean;
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/**
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* @private
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*/
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emit(event: 'requestCompleted'): boolean;
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/**
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* @private
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*/
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emit(event: 'cancel'): boolean;
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/**
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* @private
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*/
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emit(event: 'pause'): boolean;
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/**
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* @private
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*/
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emit(event: 'resume'): boolean;
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/**
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* @private
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*/
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emit(event: 'order', orderColumns: number[]): boolean;
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/**
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* @param sqlTextOrProcedure
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* The SQL statement to be executed
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*
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* @param callback
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* The callback to execute once the request has been fully completed.
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*/
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constructor(sqlTextOrProcedure: string | undefined, callback: CompletionCallback, options?: RequestOptions);
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/**
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* @param name
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* The parameter name. This should correspond to a parameter in the SQL,
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* or a parameter that a called procedure expects. The name should not start with `@`.
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*
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* @param type
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* One of the supported data types.
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*
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* @param value
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* The value that the parameter is to be given. The Javascript type of the
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* argument should match that documented for data types.
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*
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* @param options
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* Additional type options. Optional.
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*/
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addParameter(name: string, type: DataType, value?: unknown, options?: Readonly<ParameterOptions> | null): void;
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/**
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* @param name
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* The parameter name. This should correspond to a parameter in the SQL,
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* or a parameter that a called procedure expects.
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*
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* @param type
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* One of the supported data types.
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*
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* @param value
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* The value that the parameter is to be given. The Javascript type of the
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* argument should match that documented for data types
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*
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* @param options
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* Additional type options. Optional.
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*/
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addOutputParameter(name: string, type: DataType, value?: unknown, options?: Readonly<ParameterOptions> | null): void;
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/**
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* @private
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*/
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makeParamsParameter(parameters: Parameter[]): string;
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/**
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* @private
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*/
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validateParameters(collation: Collation | undefined): void;
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/**
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* Temporarily suspends the flow of data from the database. No more `row` events will be emitted until [[resume] is called.
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* If this request is already in a paused state, calling [[pause]] has no effect.
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*/
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pause(): void;
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/**
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* Resumes the flow of data from the database.
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* If this request is not in a paused state, calling [[resume]] has no effect.
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*/
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resume(): void;
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/**
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* Cancels a request while waiting for a server response.
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*/
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cancel(): void;
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/**
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* Sets a timeout for this request.
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*
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* @param timeout
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* The number of milliseconds before the request is considered failed,
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* or `0` for no timeout. When no timeout is set for the request,
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* the [[ConnectionOptions.requestTimeout]] of the [[Connection]] is used.
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*/
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setTimeout(timeout?: number): void;
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}
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export default Request;
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