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我目前正在製作一個應用程序使用Sqlite來存儲一個對象列表中的對象。我一直在試圖插入和檢索過去一週的對象時遇到困難,並且想知道我是否可以得到一些幫助。任何幫助將不勝感激!謝謝!使用Sqlite.net擴展插入/檢索數據到Sqlite
這是數據庫的對象是存儲在一個一對多的關係:
[Table("Patient")]
public class PatientDB
{
[PrimaryKey]
public string ID { get; set;}
public string Name { get; set; }
[OneToMany(CascadeOperations = CascadeOperation.All)]
public List<Vitals> PatientVitals { get; set;}
}
[Table("PatientVitals")]
public class VitalsDB
{
[PrimaryKey]
public string PatientVitalID { get; set; }
public string Weight { get; set;}
[ForeignKey(typeof(PatientItem))]
public string ID { get; set; }
}
我傳遞給我從一個REST服務以JSON的形式,我有成功的一個單獨的對象反序列化到下面的對象:
pat = new Patient
{
ID = "123",
Name = "Doe",
List<Vitals> vitals = new List<Vitals>
{
new Vitals
{
PatientVitalID = "1",
Weight = "150",
ID = "123"
}
new Vitals
{
PatientVitalID = "2",
Weight = "160",
ID = "123"
}
}
};
下面是我如何插入病人進入數據庫:
conn = DependencyService.Get<ISQLite>().GetConnection();
conn.CreateTable<PatientDB>();
conn.CreateTable<VitalsDB>();
var patientToInsert = new PatientDB();
patientToInsert.ID = pat.ID;
patientToInsert.Name = pat.Name;
conn.Insert(patientToInsert);
var vitalsToInsert = new List();
foreach (var vital in pat.Vitals)
{
var vitalToInsert = new VitalsDB();
vitalToInsert.PatientVitalID = vital.PatientVitalsID;
vitalToInsert.Weight = vital.Weight;
vitalsToInsert.Add(vitalToInsert);
}
conn.InsertAll (vitalsToInsert);
foreach (var vital in vitalsToInsert)
{
vital.SmartCardID = patientToInsert.SmartCardID;
conn.Update (vital);
}
這裏我怎麼找回病人
public List<PatientDB> retrieveDBPatient(string ID)
{
return conn.Query<PatientDB> ("SELECT * FROM [Patient] WHERE [ID]= '" + ID + "'");
}
最後,該錯誤信息
SQLite.Net.SQLiteException: Constraint
at SQLite.Net.PreparedSqlLiteInsertCommand.ExecuteNonQuery (System.Object[] source) [0x0016b] in <filename unknown>:0
at SQLite.Net.SQLiteConnection.Insert (System.Object obj, System.String extra, System.Type objType) [0x000bc] in <filename unknown>:0
'conn = DependencyService.Get().GetConnection(); conn.CreateTable (); conn.CreateTable ();' 當我複製並粘貼代碼時發生了一些錯誤,這裏是我編輯的內容! –
Fayt
完美,這是我想說的下一件事 –