fix: check if the connection is closed before executing a query. This…

… prevents SQLITE_MISUSE errors (https://sqlite.org/rescode.html#misuse) originating from sqlite itself (#6975)

src/driver/sqlite/SqliteQueryRunner.ts

@@ -4,6 +4,7 @@ import {AbstractSqliteQueryRunner} from "../sqlite-abstract/AbstractSqliteQueryR
 import {SqliteConnectionOptions} from "./SqliteConnectionOptions";
 import {SqliteDriver} from "./SqliteDriver";
 import {Broadcaster} from "../../subscriber/Broadcaster";
+import { ConnectionIsNotSetError } from '../../error/ConnectionIsNotSetError';
 
 /**
  * Runs queries on a single sqlite database connection.
@@ -39,6 +40,10 @@ export class SqliteQueryRunner extends AbstractSqliteQueryRunner {
         const connection = this.driver.connection;
         const options = connection.options as SqliteConnectionOptions;
 
+        if (!connection.isConnected){
+            throw new ConnectionIsNotSetError('sqlite')
+        }
+
         return new Promise<any[]>(async (ok, fail) => {
 
             const databaseConnection = await this.connect();

test/functional/sqlite/error-on-query-after-close.ts

@@ -0,0 +1,21 @@
+import "reflect-metadata";
+import {expect} from "chai";
+import {Connection} from "../../../src/connection/Connection";
+import {closeTestingConnections, createTestingConnections, reloadTestingDatabases} from "../../utils/test-utils";
+
+describe("sqlite driver > throws an error when queried after closing connection", () => {
+    let connections: Connection[];
+    before(async () => connections = await createTestingConnections({
+        entities: [],
+        enabledDrivers: ["sqlite"],
+    }));
+    beforeEach(() => reloadTestingDatabases(connections));
+    after(() => closeTestingConnections(connections));
+
+    it("should throw", () => Promise.all(connections.map(async connection => {
+        await connection.close()
+        await expect(connection.query('select * from sqlite_master;')).to.rejectedWith(
+            'Connection with sqlite database is not established. Check connection configuration.'
+        );
+    })));
+});