add ControlledTransaction.

scripts/copy-interface-documentation.js

@@ -22,7 +22,7 @@ const OBJECT_REGEXES = [
   /^(?:export )?declare (?:abstract )?class (\w+)/,
   /^(?:export )?interface (\w+)/,
 ]
-const GENERIC_ARGUMENTS_REGEX = /<[\w"'`,{}=| ]+>/g
+const GENERIC_ARGUMENTS_REGEX = /<[\w"'`,{}=|\[\] ]+>/g
 const JSDOC_START_REGEX = /^\s+\/\*\*/
 const JSDOC_END_REGEX = /^\s+\*\//
 
@@ -123,7 +123,7 @@ function parseObjects(file) {
 function parseImplements(line) {
   if (!line.endsWith('{')) {
     console.warn(
-      `skipping object declaration "${line}". Expected it to end with "{"'`
+      `skipping object declaration "${line}". Expected it to end with "{"'`,
     )
     return []
   }
@@ -225,7 +225,7 @@ function findDocProperty(files, object, propertyName) {
     }
 
     const interfaceProperty = interfaceObject.properties.find(
-      (it) => it.name === propertyName
+      (it) => it.name === propertyName,
     )
 
     if (interfaceProperty?.doc) {

src/dialect/mssql/mssql-dialect-config.ts

@@ -65,30 +65,36 @@ export interface Tedious {
 
 export interface TediousConnection {
   beginTransaction(
-    callback: (error?: Error | null, transactionDescriptor?: any) => void,
-    name?: string,
-    isolationLevel?: number,
+    callback: (
+      err: Error | null | undefined,
+      transactionDescriptor?: any,
+    ) => void,
+    name?: string | undefined,
+    isolationLevel?: number | undefined,
   ): void
   cancel(): boolean
   close(): void
   commitTransaction(
-    callback: (error?: Error | null) => void,
-    name?: string,
+    callback: (err: Error | null | undefined) => void,
+    name?: string | undefined,
   ): void
-  connect(callback?: (error?: Error) => void): void
+  connect(connectListener: (err?: Error) => void): void
   execSql(request: TediousRequest): void
   off(event: 'error', listener: (error: unknown) => void): this
   off(event: string, listener: (...args: any[]) => void): this
   on(event: 'error', listener: (error: unknown) => void): this
   on(event: string, listener: (...args: any[]) => void): this
   once(event: 'end', listener: () => void): this
   once(event: string, listener: (...args: any[]) => void): this
-  reset(callback: (error?: Error | null) => void): void
+  reset(callback: (err: Error | null | undefined) => void): void
   rollbackTransaction(
-    callback: (error?: Error | null) => void,
-    name?: string,
+    callback: (err: Error | null | undefined) => void,
+    name?: string | undefined,
+  ): void
+  saveTransaction(
+    callback: (err: Error | null | undefined) => void,
+    name: string,
   ): void
-  saveTransaction(callback: (error?: Error | null) => void, name: string): void
 }
 
 export type TediousIsolationLevel = Record<string, number>

src/dialect/mssql/mssql-driver.ts

@@ -86,6 +86,20 @@ export class MssqlDriver implements Driver {
     await connection.rollbackTransaction()
   }
 
+  async savepoint(
+    connection: MssqlConnection,
+    savepointName: string,
+  ): Promise<void> {
+    await connection.savepoint(savepointName)
+  }
+
+  async rollbackToSavepoint(
+    connection: MssqlConnection,
+    savepointName: string,
+  ): Promise<void> {
+    await connection.rollbackTransaction(savepointName)
+  }
+
   async releaseConnection(connection: MssqlConnection): Promise<void> {
     await connection[PRIVATE_RELEASE_METHOD]()
     this.#pool.release(connection)
@@ -174,12 +188,21 @@ class MssqlConnection implements DatabaseConnection {
     }
   }
 
-  async rollbackTransaction(): Promise<void> {
+  async rollbackTransaction(savepointName?: string): Promise<void> {
     await new Promise((resolve, reject) =>
       this.#connection.rollbackTransaction((error) => {
         if (error) reject(error)
         else resolve(undefined)
-      }),
+      }, savepointName),
+    )
+  }
+
+  async savepoint(savepointName: string): Promise<void> {
+    await new Promise((resolve, reject) =>
+      this.#connection.saveTransaction((error) => {
+        if (error) reject(error)
+        else resolve(undefined)
+      }, savepointName),
     )
   }
 

src/dialect/mysql/mysql-driver.ts

@@ -3,7 +3,9 @@ import {
   QueryResult,
 } from '../../driver/database-connection.js'
 import { Driver, TransactionSettings } from '../../driver/driver.js'
+import { parseSavepointCommand } from '../../parser/savepoint-parser.js'
 import { CompiledQuery } from '../../query-compiler/compiled-query.js'
+import { QueryCompiler } from '../../query-compiler/query-compiler.js'
 import { isFunction, isObject, freeze } from '../../util/object-utils.js'
 import { extendStackTrace } from '../../util/stack-trace-utils.js'
 import {
@@ -90,6 +92,36 @@ export class MysqlDriver implements Driver {
     await connection.executeQuery(CompiledQuery.raw('rollback'))
   }
 
+  async savepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('savepoint', savepointName)),
+    )
+  }
+
+  async rollbackToSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('rollback to', savepointName)),
+    )
+  }
+
+  async releaseSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('release savepoint', savepointName)),
+    )
+  }
+
   async releaseConnection(connection: MysqlConnection): Promise<void> {
     connection[PRIVATE_RELEASE_METHOD]()
   }

src/dialect/postgres/postgres-driver.ts

@@ -3,7 +3,14 @@ import {
   QueryResult,
 } from '../../driver/database-connection.js'
 import { Driver, TransactionSettings } from '../../driver/driver.js'
+import { IdentifierNode } from '../../operation-node/identifier-node.js'
+import { RawNode } from '../../operation-node/raw-node.js'
+import { parseSavepointCommand } from '../../parser/savepoint-parser.js'
 import { CompiledQuery } from '../../query-compiler/compiled-query.js'
+import {
+  QueryCompiler,
+  RootOperationNode,
+} from '../../query-compiler/query-compiler.js'
 import { isFunction, freeze } from '../../util/object-utils.js'
 import { extendStackTrace } from '../../util/stack-trace-utils.js'
 import {
@@ -78,6 +85,36 @@ export class PostgresDriver implements Driver {
     await connection.executeQuery(CompiledQuery.raw('rollback'))
   }
 
+  async savepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('savepoint', savepointName)),
+    )
+  }
+
+  async rollbackToSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('rollback to', savepointName)),
+    )
+  }
+
+  async releaseSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('release', savepointName)),
+    )
+  }
+
   async releaseConnection(connection: PostgresConnection): Promise<void> {
     connection[PRIVATE_RELEASE_METHOD]()
   }

src/dialect/sqlite/sqlite-driver.ts

@@ -4,7 +4,9 @@ import {
 } from '../../driver/database-connection.js'
 import { Driver } from '../../driver/driver.js'
 import { SelectQueryNode } from '../../operation-node/select-query-node.js'
+import { parseSavepointCommand } from '../../parser/savepoint-parser.js'
 import { CompiledQuery } from '../../query-compiler/compiled-query.js'
+import { QueryCompiler } from '../../query-compiler/query-compiler.js'
 import { freeze, isFunction } from '../../util/object-utils.js'
 import { SqliteDatabase, SqliteDialectConfig } from './sqlite-dialect-config.js'
 
@@ -50,6 +52,36 @@ export class SqliteDriver implements Driver {
     await connection.executeQuery(CompiledQuery.raw('rollback'))
   }
 
+  async savepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('savepoint', savepointName)),
+    )
+  }
+
+  async rollbackToSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('rollback to', savepointName)),
+    )
+  }
+
+  async releaseSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    await connection.executeQuery(
+      compileQuery(parseSavepointCommand('release', savepointName)),
+    )
+  }
+
   async releaseConnection(): Promise<void> {
     this.#connectionMutex.unlock()
   }

src/driver/driver.ts

@@ -1,3 +1,4 @@
+import { QueryCompiler } from '../query-compiler/query-compiler.js'
 import { ArrayItemType } from '../util/type-utils.js'
 import { DatabaseConnection } from './database-connection.js'
 
@@ -37,6 +38,33 @@ export interface Driver {
    */
   rollbackTransaction(connection: DatabaseConnection): Promise<void>
 
+  /**
+   * Establishses a new savepoint within a transaction.
+   */
+  savepoint?(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void>
+
+  /**
+   * Rolls back to a savepoint within a transaction.
+   */
+  rollbackToSavepoint?(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void>
+
+  /**
+   * Releases a savepoint within a transaction.
+   */
+  releaseSavepoint?(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void>
+
   /**
    * Releases a connection back to the pool.
    */

src/driver/dummy-driver.ts

@@ -65,6 +65,18 @@ export class DummyDriver implements Driver {
   async destroy(): Promise<void> {
     // Nothing to do here.
   }
+
+  async releaseSavepoint(): Promise<void> {
+    // Nothing to do here.
+  }
+
+  async rollbackToSavepoint(): Promise<void> {
+    // Nothing to do here.
+  }
+
+  async savepoint(): Promise<void> {
+    // Nothing to do here.
+  }
 }
 
 class DummyConnection implements DatabaseConnection {

src/driver/runtime-driver.ts

@@ -1,4 +1,5 @@
 import { CompiledQuery } from '../query-compiler/compiled-query.js'
+import { QueryCompiler } from '../query-compiler/query-compiler.js'
 import { Log } from '../util/log.js'
 import { performanceNow } from '../util/performance-now.js'
 import { DatabaseConnection, QueryResult } from './database-connection.js'
@@ -85,6 +86,54 @@ export class RuntimeDriver implements Driver {
     return this.#driver.rollbackTransaction(connection)
   }
 
+  savepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    if (this.#driver.savepoint) {
+      return this.#driver.savepoint(connection, savepointName, compileQuery)
+    }
+
+    throw new Error('The `savepoint` method is not supported by this driver')
+  }
+
+  rollbackToSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    if (this.#driver.rollbackToSavepoint) {
+      return this.#driver.rollbackToSavepoint(
+        connection,
+        savepointName,
+        compileQuery,
+      )
+    }
+
+    throw new Error(
+      'The `rollbackToSavepoint` method is not supported by this driver',
+    )
+  }
+
+  releaseSavepoint(
+    connection: DatabaseConnection,
+    savepointName: string,
+    compileQuery: QueryCompiler['compileQuery'],
+  ): Promise<void> {
+    if (this.#driver.releaseSavepoint) {
+      return this.#driver.releaseSavepoint(
+        connection,
+        savepointName,
+        compileQuery,
+      )
+    }
+
+    throw new Error(
+      'The `releaseSavepoint` method is not supported by this driver',
+    )
+  }
+
   async destroy(): Promise<void> {
     if (!this.#initPromise) {
       return