Expose database property in result summary

Author: ali-ince

src/result-summary.js

@@ -105,6 +105,13 @@ class ResultSummary {
      * @public
      */
     this.resultAvailableAfter = metadata.result_available_after
+
+    /**
+     * The database name where this summary is obtained from.
+     * @type {{name: string}}
+     * @public
+     */
+    this.database = { name: metadata.db || null }
   }
 
   _buildNotifications (notifications) {

test/bolt-v4.test.js

@@ -118,6 +118,23 @@ describe('Bolt V4 API', () => {
             done()
           })
       })
+
+      it('should return db.name as null in result summary', async () => {
+        if (databaseSupportsBoltV4()) {
+          return
+        }
+
+        const session = driver.session()
+
+        try {
+          const result = await session.readTransaction(tx => tx.run('RETURN 1'))
+
+          expect(result.summary.database).toBeTruthy()
+          expect(result.summary.database.name).toBeNull()
+        } finally {
+          session.close()
+        }
+      })
     })
 
     it('should fail if connecting to a non-existing database', async () => {
@@ -138,7 +155,17 @@ describe('Bolt V4 API', () => {
       }
     })
 
+    describe('default database', function () {
+      it('should return database name in summary', async () => {
+        await testDatabaseNameInSummary(null)
+      })
+    })
+
     describe('neo4j database', () => {
+      it('should return database name in summary', async () => {
+        await testDatabaseNameInSummary('neo4j')
+      })
+
       it('should be able to create a node', async () => {
         if (!databaseSupportsBoltV4()) {
           return
@@ -186,6 +213,27 @@ describe('Bolt V4 API', () => {
     })
   })
 
+  async function testDatabaseNameInSummary (dbname) {
+    if (!databaseSupportsBoltV4()) {
+      return
+    }
+
+    const neoSession = dbname
+      ? driver.session({ db: dbname })
+      : driver.session()
+
+    try {
+      const result = await neoSession.run('CREATE (n { id: $id }) RETURN n', {
+        id: 5
+      })
+
+      expect(result.summary.database).toBeTruthy()
+      expect(result.summary.database.name).toBe(dbname || 'neo4j')
+    } finally {
+      neoSession.close()
+    }
+  }
+
   function expectBoltV4NotSupportedError (error) {
     expect(
       error.message.indexOf(