Question

我正在使用此代码

using (var db = OpenDbConnection())
            if (db != null)
                db.Run(dbCnx =>
                {
                    var trans = dbCnx.BeginTransaction();

                        dbCnx.UpdateOnly(new ProtectiveMarkingRequest
                        {
                            SecondApproverUserName = request.SecondApproverUserName,
                            Status = request.Status
                        },
                            onlyFields: p => new
                            {
                                p.SecondApproverUserName,
                                p.Status
                            },
                            @where: p => p.WorkItemCode == request.WorkItemCode);
                    } 

                    trans.Commit();
                });

更新到servicestack.ormlite.oracle 4.0.52（从4.0.38）后，我收到以下错误：

System.InvalidCastException未被用户代码处理的HResult = -2147467262 Message =无法将“ServiceStack.OrmLite.OrmLiteDataParameter”类型的对象强制转换为“Oracle.DataAccess.Client.OracleParameter”。来源= Oracle.DataAccess 堆栈跟踪： at Oracle.DataAccess.Client.OracleParameterCollection.Add（Object obj） at ServiceStack.OrmLite.DbDataParameterExtensions.AddParam（IOrmLiteDialectProvider dialectProvider，IDbCommand dbCmd，Object value，Type fieldType） at ServiceStack.OrmLite.Oracle.OracleOrmLiteDialectProvider.PrepareUpdateRowStatement（IDbCommand dbCmd，Object objWithProperties，ICollection 1 updateFields) at ServiceStack.OrmLite.WriteExpressionCommandExtensions.UpdateOnlySql[T](IDbCommand dbCmd, T model, SqlExpression 1 onlyFields） at ServiceStack.OrmLite.WriteExpressionCommandExtensions.UpdateOnly [T]（IDbCommand dbCmd，T model，SqlExpression 1 onlyFields) at ServiceStack.OrmLite.OrmLiteWriteExpressionsApi.<>c__DisplayClass7 2.b__6（IDbCommand dbCmd）在ServiceStack.OrmLite.OrmLiteExecFilter.Exec [T]（IDbConnection dbConn，Func`2过滤器）在SecurityRepository.cs中的ECMAPI.Repository.Security.SecurityRepository。＆lt;＆gt; c__DisplayClassfb.b__f9（IDbConnection dbCnx）：第1970行

任何线索？

Answer 1

要使用Transaction Support in OrmLite，您应该使用OpenTransaction()，Run()扩展方法也不会提供任何值，因此我会将您的示例重写为：

using (var db = OpenDbConnection())
using (var trans = db.OpenTransaction())
{
    db.UpdateOnly(new ProtectiveMarkingRequest
        {
            SecondApproverUserName = request.SecondApproverUserName,
            Status = request.Status
        },
        onlyFields: p => new {
            p.SecondApproverUserName,
            p.Status
        },
        @where: p => p.WorkItemCode == request.WorkItemCode);
    } 
    trans.Commit();
}

无法将“ServiceStack.OrmLite.OrmLiteDataParameter”类型的对象强制转换为“Oracle.DataAccess.Client.OracleParameter”

1 个答案: