{
  "ConnectionStrings": {
    "postgresql": "User ID=root;Host=localhost;Port=26257;Database=iotdb;",
    "sqlite": "Data Source=studycenter.db",
    "mysql": "Server=mysql;Port=3306;Database=studycenter;Uid=root;Pwd=root;"
  },
  "AppSettings": {
    "database": "mysql",
    "cache": "memory"
  }
}