本文整理了Java中leap.orm.query.Query.singleOrNull方法的一些代码示例，展示了Query.singleOrNull的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query.singleOrNull方法的具体详情如下：
包路径：leap.orm.query.Query
类名称：Query
方法名：singleOrNull

Query.singleOrNull介绍

[英]Executes this query and return the first row.

Returns null if no result returned.
[中]执行此查询并返回第一行。
如果没有返回结果，则返回null。

代码示例

代码示例来源：origin: org.leapframework/leap-websecurity

@Override
public UserDetails loadUserDetailsById(Object userId) {
  return lazyDao.get()
       .createNamedQuery(SQL_KEY_FIND_USER_DETAILS_BY_ID, SimpleUserDetails.class)
       .param(SQL_PARAM_USER_ID, userId)
       .singleOrNull();
}

代码示例来源：origin: org.leapframework/leap-websecurity

@Override
public UserDetails loadUserDetailsByLoginName(String username) {
  return lazyDao.get()
      .createNamedQuery(SQL_KEY_FIND_USER_DETAILS_BY_LOGIN_NAME, SimpleUserDetails.class)
      .param(SQL_PARAM_LOGIN_NAME, username)
      .singleOrNull();
}

代码示例来源：origin: org.leapframework/leap-oauth2-server

@Override
public AuthzSSOSession loadSessionById(String id) {
  AuthzSSOSessionEntity session = null;
  if(null != loadSessionByIdCommand) {
    session = dao.createQuery(AuthzSSOSessionEntity.class, loadSessionByIdCommand).singleOrNull();
  }else{
    session = dao.createCriteriaQuery(AuthzSSOSessionEntity.class)
        .where("id = ? and expiration > ?", new Object[]{id, new Date()})
        .singleOrNull();
  }
  if(null == session) {
    return null;
  }
  return createSessionFromEntity(session);
}

代码示例来源：origin: org.leapframework/leap-oauth2-server

@Override
public AuthzSSOSession loadSessionByToken(String username, String token) {
  AuthzSSOSessionEntity session = null;
  if(null != loadSessionByTokenCommand) {
    session = dao.createQuery(AuthzSSOSessionEntity.class, loadSessionByTokenCommand).singleOrNull();
  }else{
    session = dao.createCriteriaQuery(AuthzSSOSessionEntity.class)
           .where("token = ? and user_name = ? and expiration > ?", new Object[]{token, username, new Date()})
           .firstOrNull();
  }
  if(null == session) {
    return null;
  }
  return createSessionFromEntity(session);
}

代码示例来源：origin: org.leapframework/leap-oauth2

@Override
public AuthzSSOSession loadSessionByToken(String username, String token) {
  AuthzSSOSessionEntity session = null;
  if(null != loadSessionByTokenCommand) {
    session = dao.createQuery(AuthzSSOSessionEntity.class, loadSessionByTokenCommand).singleOrNull();
  }else{
    session = dao.createCriteriaQuery(AuthzSSOSessionEntity.class)
           .where("token = ? and user_name = ? and expiration > ?", new Object[]{token, username, new Date()})
           .firstOrNull();
  }
  if(null == session) {
    return null;
  }
  return createSessionFromEntity(session);
}

代码示例来源：origin: org.leapframework/leap-oauth2

@Override
public AuthzSSOSession loadSessionById(String id) {
  AuthzSSOSessionEntity session = null;
  if(null != loadSessionByIdCommand) {
    session = dao.createQuery(AuthzSSOSessionEntity.class, loadSessionByIdCommand).singleOrNull();
  }else{
    session = dao.createCriteriaQuery(AuthzSSOSessionEntity.class)
        .where("id = ? and expiration > ?", new Object[]{id, new Date()})
        .singleOrNull();
  }
  if(null == session) {
    return null;
  }
  return createSessionFromEntity(session);
}