C# 尝试使用sqlite在xamarin应用程序中进行大容量插入时出现异常
我开发了从rest服务发送Json的代码 我接收并威胁代码并生成SQLINSERT语句 我得到了这个错误:C# 尝试使用sqlite在xamarin应用程序中进行大容量插入时出现异常,c#,sqlite,xamarin,sqlite-net,C#,Sqlite,Xamarin,Sqlite Net,我开发了从rest服务发送Json的代码 我接收并威胁代码并生成SQLINSERT语句 我得到了这个错误: [0:] SQLite.SQLiteException: Constraint at SQLite.SQLiteCommand.ExecuteNonQuery () [0x000ca] in <84b9c9e630fa45bd8ac799333976ebbf>:0 at GSAN_Mobile.Repository.GsanMobileRepository`1+<
[0:] SQLite.SQLiteException: Constraint
at SQLite.SQLiteCommand.ExecuteNonQuery () [0x000ca] in <84b9c9e630fa45bd8ac799333976ebbf>:0
at GSAN_Mobile.Repository.GsanMobileRepository`1+<>c__DisplayClass9_1[T].<BulkInsert>b__0 (Newtonsoft.Json.Linq.JToken register) [0x0002c] in D:\Projetos\Gsan\mobile\front\GSAN_Mobile\GSAN_Mobile\GSAN_Mobile\Repository\GsanMobileRepository.cs:185
at System.Collections.Generic.List`1[T].ForEach (System.Action`1[T] action) [0x0001e] in <6de48997d0c0445dbea8d4d83492d8c6>:0
at GSAN_Mobile.Repository.GsanMobileRepository`1[T].BulkInsert (Newtonsoft.Json.Linq.JArray array, System.String tableName) [0x00062] in D:\Projetos\Gsan\mobile\front\GSAN_Mobile\GSAN_Mobile\GSAN_Mobile\Repository\GsanMobileRepository.cs:180
我的utils方法
public static string GenerateInsertStatement(JToken register, string tableName)
{
var data = JsonConvert.DeserializeObject<Dictionary<string, string>>(register.ToString());
string columns = string.Join(",", data.Keys.ToList());
string values = string.Join(",", data.Values.Select(v => string.Format(@"'{0}'", v.Trim())));
return string.Format("INSERT INTO {0} ({1}) VALUES ({2}); ", tableName, columns, values);
}
public static void CloseConnection(SQLiteConnection connection)
{
connection.Dispose();
connection.Close();
}
我几乎每次发Id的时候,什么时候发的
我的API不会引发异常。SQLite.SQLiteException:Constraint异常及其随机发生的事实是关键。您在某个地方违反了表约束 您的SQLite表需要一个未接收到的值。例如,如果您的一个数据字段在表中标记为“NOT NULL”,并且数据中的一个字段为NULL,则该约束将失败,您将收到异常 您需要确定哪些字段具有约束,然后处理接收到的数据以确保约束的完整性。将null
TEXT
值转换为String。如果表具有非null
约束,则将空的或null
整数字段从null
转换为0。您必须查看数据结构中设置的约束
因此,您应该真正研究参数化查询。您当前的INSERT
语句只是自找麻烦,因为它容易被注入。例如,如果值
字符串之一包含逗号,它可能会打断您的语句,因为SQLite不知道值
只是一个值,只是将其作为查询命令的一部分。参数解决了这个问题。如果您正确地遵循了表的约束,这也可能是导致您出现问题的原因
下面是一个小示例,说明如何使用参数构建查询
cmd.CommandText = "INSERT INTO MyTable (CompanyName, Address) VALUES (@Name, @Address)";
cmd.Parameters.AddWithValue("@CompanyName", myCompanyNameString);
cmd.Parameters.AddWithValue("@Address", myAddressString);
由于我的动态查询值是参数化的,我可以使我的值具有特殊的字符或语句,如“DROP TABLE”,它将得到正确的处理,并防止注入攻击或查询中断字符或单词的异常 我不知道为什么,但是我的sqlite没有参数方法。您使用的是System.Data.sqlite
?如果是,则应在SqliteCommand
对象中提供。如果没有,那就奇怪了。我正在为Xamarin使用SQLiteNetExtensions
和sqlitenetpcl
。您可以使用cmd.Bind(“@CompanyName”,myCompanyNameString)
。
private async Task RegistrarDados()
{
try
{
_logs.Add("Realizando o Download: ");
GenerateAtendimentoMotivosEncerramento();
GenerateHidrometrosLocalInstalacao();
GenerateHidrometrosProtecao();
GenerateFuncionarios();
GenerateGrupoFaturamento();
GenerateLigacaoAguaSituacoes();
GenerateLigacaoEsgotoSituacoes();
GenerateServicosTipo();
GenerateSistemParametros();
GenerateOrdensServico();
//GenerateContas();
int contador = _ordemServicoRepository.Count<OrdemServico>();
_logs.Add("Sincronização encerrada com sucesso!");
await App.Current.MainPage.DisplayAlert("Atenção", "Foram importados " + contador + " Ordens de Serviços!", "OK");
PodeSincronizar = true;
}
catch (Exception e)
{
LogUtil.WriteLog(e);
}
}
private async void GenerateOrdensServico()
{
try
{
_logs.Add("ORDENS DE SERVIÇO");
int? records = await _ordemServicoRest.GetCount();
int? limit = _sistemaParametroRepository.GetTamanhoPaginaSincMobile();
int? pages = (records / limit);
for (int i = 0; i <= pages; i++)
{
JArray ordensServico = await _ordemServicoRest.GetAllInJsonFormatPaginated(DataBaseUtil.GetPagination(i, limit.Value));
if (ordensServico == null)
{
_logs.Add("Não Contem O.S de Corte para importar!");
await App.Current.MainPage.DisplayAlert("Atenção", "Não tem O.S para importar!", "OK");
continue;
}
_ordemServicoRepository.BulkInsert(ordensServico);
}
}
catch (Exception e)
{
LogUtil.WriteLog(e);
}
}
[Serializable]
public class Persistent
{
[AutoIncrement]
[PrimaryKey]
[NotNull]
[JsonProperty("id")]
public int? Id { get; set; }
}
[Table("OrdemServico")]
public class OrdemServico : Persistent
{
[JsonProperty("situacaoOS")]
public int? SituacaoOS { get; set; }
[JsonProperty("idServicoTipo")]
public int? IdServicoTipo { get; set; }
[JsonProperty("dataGeracao")]
public string DataGeracao { get; set; }
[JsonProperty("idRegistroAtendimento")]
public int? IdRegistroAtendimento { get; set; }
[JsonProperty("idgrupo")]
public int? IdGrupo { get; set; }
[JsonProperty("matriculaCliente")]
public int? MatriculaCliente { get; set; }
[JsonProperty("nomeCliente")]
public string NomeCliente { get; set; }
[JsonProperty("tipoLogradouro")]
public string TipoLogradouro { get; set; }
[JsonProperty("logradouro")]
public string Logradouro { get; set; }
[JsonProperty("numeroImovel")]
public int? NumeroImovel { get; set; }
[JsonProperty("numeroCep")]
public int? NumeroCep { get; set; }
[JsonProperty("bairro")]
public string Bairro { get; set; }
[JsonProperty("numeroHidrometro")]
public string NumeroHidrometro { get; set; }
[JsonProperty("idHidrometroProtecao")]
public int? IdHidrometroProtecao { get; set; }
[JsonProperty("idHidrometroLocalInstalacao")]
public int? IdHidrometroLocalInstalacao { get; set; }
[JsonProperty("imovel")]
public int? Imovel { get; set; }
[JsonProperty("ligacaoAguaSituacao")]
public int? LigacaoAguaSituacao { get; set; }
[JsonProperty("ligacaoEsgotoSituacao")]
public int? LigacaoEsgotoSituacao { get; set; }
[JsonProperty("sincronizada")]
public int? Sincronizada { get; set; }
}
cmd.CommandText = "INSERT INTO MyTable (CompanyName, Address) VALUES (@Name, @Address)";
cmd.Parameters.AddWithValue("@CompanyName", myCompanyNameString);
cmd.Parameters.AddWithValue("@Address", myAddressString);