@Singleton
public class UserDao
extends AbstractDao

DAO for User entity

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`authenticate(java.lang.String normalizedUsername, java.lang.String passwordHash)`
`int`	`count()`	Returns the number of User rows
`void`	`create(User user)`	Persist user (involves creating a JatosWorker)
`java.util.List<User>`	`findAll()`
`java.util.Map<java.lang.String,java.util.List<java.lang.Long>>`	`findAllUsersAndTheirStudyIds()`	Returns a mapping of usernames to a list of study IDs for which each user is a member.
`User`	`findById(java.lang.Long id)`
`User`	`findByUsername(java.lang.String normalizedUsername)`
`java.util.List<User>`	`findLastSeen(int limit)`	Returns the users with the most recent lastSeen datetime field.
`void`	`refresh(User user)`
`void`	`remove(User user)`
`void`	`update(User user)`

Methods inherited from class daos.common.AbstractDao
flush, merge, persist, refresh, remove

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

create
```
public void create(User user)
```
Persist user (involves creating a JatosWorker)

public boolean authenticate(java.lang.String normalizedUsername,
                            java.lang.String passwordHash)

public User findByUsername(java.lang.String normalizedUsername)

public User findById(java.lang.Long id)

findAllUsersAndTheirStudyIds
```
public java.util.Map<java.lang.String,java.util.List<java.lang.Long>> findAllUsersAndTheirStudyIds()
```
Returns a mapping of usernames to a list of study IDs for which each user is a member.

findLastSeen
```
public java.util.List<User> findLastSeen(int limit)
```
Returns the users with the most recent lastSeen datetime field. Limit the number by 'limit'.

Class UserDao