fix: respect database from connection urls

src/connection/Connection.ts

@@ -38,6 +38,7 @@ import {ObjectUtils} from "../util/ObjectUtils";
 import {PromiseUtils} from "../";
 import {IsolationLevel} from "../driver/types/IsolationLevel";
 import {AuroraDataApiDriver} from "../driver/aurora-data-api/AuroraDataApiDriver";
+import {DriverUtils} from "../driver/DriverUtils";
 
 /**
  * Connection is a single database ORM connection to a specific database.
@@ -524,17 +525,17 @@ export class Connection {
 
     // This database name property is nested for replication configs.
     protected getDatabaseName(): string {
-    const options = this.options;
-    switch (options.type) {
-        case "mysql" :
-        case "mariadb" :
-        case "postgres":
-        case "cockroachdb":
-        case "mssql":
-        case "oracle":
-            return (options.replication ? options.replication.master.database : options.database) as string;
-        default:
-            return options.database as string;
+        const options = this.options;
+        switch (options.type) {
+            case "mysql" :
+            case "mariadb" :
+            case "postgres":
+            case "cockroachdb":
+            case "mssql":
+            case "oracle":
+                return DriverUtils.buildDriverOptions(options.replication ? options.replication.master : options).database;
+            default:
+                return DriverUtils.buildDriverOptions(options).database;
     }
 }
 

test/github-issues/2096/entity/TestEntity.ts

@@ -0,0 +1,9 @@
+import {Entity, PrimaryGeneratedColumn} from "../../../../src";
+
+@Entity()
+export class TestEntity {
+
+    @PrimaryGeneratedColumn()
+    id: number;
+
+}

test/github-issues/2096/issue-2096.ts

@@ -0,0 +1,24 @@
+import "reflect-metadata";
+import { expect } from "chai";
+import { createConnection } from "../../../src";
+import { getTypeOrmConfig } from "../../utils/test-utils";
+
+describe("github issues > #2096 [mysql] Database name isn't read from url", () => {
+    it("should be possible to define a database by connection url for mysql", async () => {
+        const config = getTypeOrmConfig();
+
+        // it is important to synchronize here, to trigger EntityMetadataValidator.validate
+        // that previously threw the error where the database on the driver object was undefined
+        if (config.find(c => c.name === "mysql" && !c.skip)) {
+            const connection = await createConnection({
+                name: "#2096",
+                url: "mysql://root:admin@localhost:3306/test",
+                entities: [__dirname + "/entity/*{.js,.ts}"],
+                synchronize: true,
+                type: "mysql"
+            });
+            expect(connection.isConnected).to.eq(true);
+            await connection.close();
+        }
+    });
+});