在 JSON 的 URL 中获取多个变量答案

【问题标题】：Getting multiple variables in URL for JSON在 JSON 的 URL 中获取多个变量
【发布时间】：2014-11-06 17:29:55
【问题描述】：

我正在尝试检索 URL 中的多个变量，因此我可以向数据库发送查询以选择特定对象，但它似乎选择了第一个对象而其他对象为空。

@RequestMapping(value = "getGroup/{Name}/{StartDate}/{EndDate}/{Status_GroupID}", method = RequestMethod.GET)
public @ResponseBody List<GroupsDetails> getGroupList(
        @PathVariable String Name, String StartDate, String EndDate,
        Integer Status_GroupID) {

    return musicStoreService.getGroupList(Name, StartDate, EndDate, Status_GroupID);
}

我收到的错误：

    Hibernate: select groupsdeta0_.Status_GroupID as Status1_1_, groupsdeta0_.GroupsID as GroupsID1_,        groupsdeta0_.EndDate as EndDate1_, groupsdeta0_.Name as Name1_, groupsdeta0_.StartDate as StartDate1_ from Groups groupsdeta0_ where groupsdeta0_.Name=Gamma and (groupsdeta0_.StartDate is null) and (groupsdeta0_.EndDate is null) and (groupsdeta0_.Status_GroupID is null)
Sep 12, 2014 2:41:40 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [SpringDispatcher] in context with path [/ATS] threw exception  [Request processing failed; nested exception is org.hibernate.exception.SQLGrammarException: could  not execute query] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'Gamma' in 'where clause'

该表名为 Groups，它包含以下行：Name、StartDate、EndDate、Status_GroupID 和 GroupsID

更新：

我试图通过提供行详细信息来检索主键，但它不起作用。

@Override
public List<GroupsDetails> getGroupList(String Name, String StartDate, String EndDate, Integer Status_GroupID) {
  SessionFactory sessionFactory=HibernateSessionManager.getSessionFactory();
  Session session=sessionFactory.getCurrentSession();
  Transaction transaction=session.beginTransaction();
  try{
    transaction.begin();
    @SuppressWarnings("unchecked")
    List<GroupsDetails> groupList=session.createSQLQuery("FROM Groups WHERE Name=" + Name + " AND StartDate=" + StartDate + " AND EndDate=" + EndDate + " AND Status_GroupID=" + Status_GroupID).list();
    return groupList;
  }finally{
    session.close();
  }

}

但它会抛出语法错误的异常，即使我看不到语法错误。错误是：

Hibernate: FROM Groups WHERE Name=Gamma AND StartDate=01-06-2014 AND EndDate=01-09-2014 AND Status_GroupID=1
Sep 12, 2014 3:35:51 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [SpringDispatcher] in context with path [/ATS] threw exception [Request processing failed; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM Groups WHERE Name=Gamma AND StartDate=01-06-2014 AND EndDate=01-09-2014 AND' at line 1

【问题讨论】：

标签： mysql json hibernate url servlets

【解决方案1】：

根据错误详情：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for the right syntax to use near 
'FROM Groups WHERE Name=Gamma AND StartDate=01-06-2014 AND EndDate=01-09-2014 AND' at line 1

它清楚地表明您缺少引号，例如：Name=Gamma 应该是 Name='Gamma'

您也可以使用Parameters 创建Query，例如：

query = sess.createSQLQuery("SELECT * FROM Groups 
        WHERE NAME=:name  AND StartDate=:startDate AND EndDate=:endDate 
        AND Status_GroupID=:status_GroupID").addEntity(Groups.class);

   query.setString("name", name);
   query.setDate("startDate", StartDate);
   query.setString("endDate", EndDate);
   query.setString("status_GroupID", Status_GroupID);


List<GroupsDetails> groupList = query.list();

【讨论】：

【解决方案2】：

您需要在所有参数前面加上@PathVariable。喜欢

public @ResponseBody List<GroupsDetails> getGroupList(
        @PathVariable String Name, @PathVariable String StartDate, @PathVariable String EndDate,
        @PathVariable Integer Status_GroupID)

【讨论】：

谢谢它的工作，但现在我有另一个问题。如果可以的话，你可以看看吗？