//This code works fine.
UserProfile profile = session.QueryOver<UserProfile>().Where(userProfile => userProfile.UserId == user).List().FirstOrDefault();
//This code throws an invalid Syntax Error
IList<Character> characters = session.QueryOver<Character>().Where(character => character.UserId == user).List<Character>();
使用NHibernate QueryOver时，我遇到上述代码的问题。数据库具有与User表关系设置的两个项目。它们的设置相同，两个Map类都是这样设置的。
public class CharacterMap : ClassMap<Character>
{
public CharacterMap()
{
Id(x => x.Id).Column("id");
Map(x => x.Name).Column("name");
Map(x => x.Class).Column("class");
Map(x => x.Level).Column("level");
Map(x => x.Sex).Column("sex");
Map(x => x.Stats).Column("stats"); //Varchar 2048
Map(x => x.Position).Column("position"); //Varchar 1024
References(x => x.UserId).Column("user_id");
Table("character");
}
}
和
public class UserProfileMap : ClassMap<UserProfile>
{
public UserProfileMap()
{
Id(x => x.Id).Column("id");
Map(x => x.CharacterSlots).Column("character_slots");
References(x => x.UserId).Column("user_id");
Table("user_profile");
}
}
和User是根据此映射构建的类。
public class UserMap : ClassMap<User>
{
public UserMap()
{
Id(x => x.Id).Column("id");
Map(x => x.Username).Column("username");
Map(x => x.Password).Column("password");
Map(x => x.Salt).Column("salt");
Map(x => x.Email).Column("email_address");
Map(x => x.Algorithm).Column("algorithm");
Map(x => x.Created).Column("created_at");
Map(x => x.Updated).Column("updated_at");
Table("user");
}
}
实体是：
public class UserProfile
{
public virtual int Id { get; set; }
public virtual User UserId { get; set; }
public virtual int CharacterSlots { get; set; }
}
public class User
{
public virtual int Id { get; set; }
public virtual string Username { get; set; }
public virtual string Password { get; set; }
public virtual string Salt { get; set; }
public virtual string Email { get; set; }
public virtual string Algorithm { get; set; }
public virtual DateTime Created { get; set; }
public virtual DateTime Updated { get; set; }
}
public class Character
{
public virtual int Id { get; set; }
public virtual User UserId { get; set; }
public virtual string Name { get; set; }
public virtual string Class { get; set; }
public virtual string Sex { get; set; }
public virtual int? Level { get; set; }
public virtual string Stats { get; set; }
public virtual string Position { get; set; }
public virtual CharacterDetails BuildCharacterListItem()
{
return new CharacterDetails()
{
Id = Id,
Class = Class,
Name = Name,
Level = Level,
Sex = Sex
};
}
}
问题是当我试图获得＆＃34;字符＆＃34;从使用User类作为比较的表中，我得到一个语法错误但是你可以看到第一个查询返回结果很好，两者几乎完全相同。
有谁知道为什么会发生这种情况？我无法理解我的生活。
我收到的错误是：
Error: could not execute query
[ SELECT this_.id as id0_0_, this_.name as name0_0_, this_.class as
class0_0_, this_.level as level0_0_, this_.sex as sex0_0_, this_.stats
as stats0_0_, this_.position as position0_0_, this_.user_id as
user8_0_0_ FROM character this_ WHERE this_.user_id = ?p0 ]
Name:cp0 - Value:PerilousServer.Data.NHibernate.User
[SQL: SELECT this_.id as id0_0_, this_.name as name0_0_, this_.class
as class0_0_, this_.level as level0_0_, this_.sex as sex0_0_, this_.stats
as stats0_0_, this_.position as position0_0_, this_.user_id as user8_0_0_
FROM character this_ WHERE this_.user_id = ?p0]
Error: 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 'character this_ WHERE this_.user_id = 11' at line 1
如果有帮助，最后这里是整个会话/交易。即使我能够使用相同的QueryOver语法获取UserProfile，所以一切都恢复正常，直到我点击QueryOver（）。
try
{
using (var session = NHibernateHelper.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
//Get userData from logged in connections for verification later..
var userData = Server.Instance.ConnectedUsers[peerID];
var user = session.QueryOver<User>().Where(u => u.Id == userID).List().FirstOrDefault();
if (user != null)
{
UserProfile profile = session.QueryOver<UserProfile>().Where(userProfile => userProfile.UserId == user).List().FirstOrDefault();
if (profile != null)
{
//Check to see if peerID is actually connected.
if (userData != null && userData.ClientData<UserData>().UserId == userID )
{
Console.Write("Found user: {0} and matching to character.", profile.UserId.Id);
IList<Character> characters = session.QueryOver<Character>().Where(character => character.UserId == user).List<Character>();
List<CharacterDetails> characterList = new List<CharacterDetails>();
foreach (var character in characters)
{
characterList.Add(character.BuildCharacterListItem());
}
response = new Message(MessageType.Response, MessageCode.Login, (byte)LoginCode.CharacterList);
response.AddParameter(MessageParameterCode.CharacterSlots, profile.CharacterSlots);
response.AddParameter(MessageParameterCode.CharacterList, characterList);
client.Send(response);
transaction.Commit();
}
else
{
//Send message saying the account was trying to access someone elses information.
client.OnLog("User ID's did not match. PeerID is incorrect.");
}
}
else
{
//Send message that profile was not found.
client.OnLog("User Profile was not found.");
}
}
else
{
//Send message saying there was no user with that ID. NULL
client.OnLog("UserID was null.");
}
}
}
}
catch (Exception e)
{
client.OnError(e.Message);
client.OnError(e.InnerException.Message);
//Send message we recieved an error.
}
}
答案 0 :(得分：2)
显然这是因为character是mySql中的保留字。有关详细信息，请参阅this问题。
答案 1 :(得分：2)
低飞鹈鹕是对的。
只需将反引号添加到映射类中，如下所示：
public class CharacterMap : ClassMap<Character>
{
public CharacterMap()
{
Table("`character`");
}
}