feat: support enableWal for the better-sqlite3 driver (#9619)

src/driver/better-sqlite3/BetterSqlite3ConnectionOptions.ts

@@ -69,4 +69,11 @@ export interface BetterSqlite3ConnectionOptions extends BaseDataSourceOptions {
     readonly nativeBinding?: string
 
     readonly poolSize?: never
+
+    /**
+     * Enables WAL mode. By default its disabled.
+     *
+     * @see https://www.sqlite.org/wal.html
+     */
+    readonly enableWAL?: boolean
 }

src/driver/better-sqlite3/BetterSqlite3Driver.ts

@@ -163,7 +163,9 @@ export class BetterSqlite3Driver extends AbstractSqliteDriver {
         databaseConnection.exec(`PRAGMA foreign_keys = ON`)
 
         // turn on WAL mode to enhance performance
-        databaseConnection.exec(`PRAGMA journal_mode = WAL`)
+        if (this.options.enableWAL) {
+            databaseConnection.exec(`PRAGMA journal_mode = WAL`)
+        }
 
         return databaseConnection
     }

test/github-issues/9410/issue-9410.ts

@@ -0,0 +1,33 @@
+import "reflect-metadata"
+import { expect } from "chai"
+import { DataSource } from "../../../src/data-source/DataSource"
+import {
+    closeTestingConnections,
+    createTestingConnections,
+    reloadTestingDatabases,
+} from "../../utils/test-utils"
+
+describe("better-sqlite3 driver > enable wal", () => {
+    let connections: DataSource[]
+    before(
+        async () =>
+            (connections = await createTestingConnections({
+                entities: [],
+                enabledDrivers: ["better-sqlite3"],
+                driverSpecific: {
+                    enableWAL: true,
+                },
+            })),
+    )
+    beforeEach(() => reloadTestingDatabases(connections))
+    after(() => closeTestingConnections(connections))
+
+    it("github issues > #9410 The better-sqlite3 driver should support the enableWal flag", () =>
+        Promise.all(
+            connections.map(async (connection) => {
+                const result = await connection.query("PRAGMA journal_mode")
+
+                expect(result).to.eql([{ journal_mode: "wal" }])
+            }),
+        ))
+})