fix: escape column comment in mysql driver

src/driver/mysql/MysqlQueryRunner.ts

@@ -1680,7 +1680,7 @@ export class MysqlQueryRunner extends BaseQueryRunner implements QueryRunner {
         if (column.isGenerated && column.generationStrategy === "increment") // don't use skipPrimary here since updates can update already exist primary without auto inc.
             c += " AUTO_INCREMENT";
         if (column.comment)
-            c += ` COMMENT '${column.comment}'`;
+            c += ` COMMENT '${column.comment.replace("'", "''")}'`;
         if (column.default !== undefined && column.default !== null)
             c += ` DEFAULT ${column.default}`;
         if (column.onUpdate)

test/github-issues/6066/entity/Session.ts

@@ -0,0 +1,11 @@
+import {Entity, PrimaryColumn} from "../../../../src";
+
+@Entity()
+export class Session {
+
+    @PrimaryColumn({
+        comment: "That's the way the cookie crumbles"
+    })
+    cookie: string = "";
+
+}

test/github-issues/6066/issue-6066.ts

@@ -0,0 +1,22 @@
+import "reflect-metadata";
+import {createTestingConnections, closeTestingConnections} from "../../utils/test-utils";
+import {QueryFailedError, Connection} from "../../../src";
+import {Session} from "./entity/Session";
+import {expect} from "chai";
+
+describe("github issues > #6066 Column comment string is not escaped during synchronization", () => {
+
+    let connections: Connection[];
+    before(async () => connections = await createTestingConnections({
+        entities: [Session],
+        enabledDrivers: ["mysql", "mariadb"],
+        schemaCreate: false,
+        dropSchema: true,
+    }));
+    after(() => closeTestingConnections(connections));
+
+    it("should synchronize", () => Promise.all(connections.map(connection => {
+        return expect(connection.synchronize()).to.not.be.rejectedWith(QueryFailedError);
+    })));
+
+});