Issue type:

[ ] question
[X] bug report
[ ] feature request
[ ] documentation issue

Database system/driver:

[ ] cordova
[ ] mongodb
[ ] mssql
[ ] mysql / mariadb
[X] oracle
[ ] postgres
[ ] sqlite
[ ] sqljs
[ ] react-native

TypeORM version:

[X] latest
[ ] @next
[ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

await queryRunner.manager.createQueryBuilder()
          .insert()
          .into(Person)
          .values(people)
          .execute()

// { Error: ORA-00933: SQL command not properly ended errorNum: 933, offset: 140 }

Oracle seems doesn't support syntax like INSERT INTO xxx VALUES (value1, ...), (value2, ...)