sqlparameter

问题 I'm using EF DbContext SqlQuery to get a list of paged objects using PagedList (https://github.com/TroyGoode/PagedList) and I'm getting the following error: "The SqlParameter is already contained by another SqlParameterCollection" Here's my repository code: var db = (DbContext)DataContext; const string sqlString = @" WITH UserFollowerList AS ( SELECT uf.FollowId FROM UserFollow uf WHERE uf.UserId = @UserId ) SELECT * FROM UserFollowerList uf INNER JOIN [User] u ON uf.FollowId = u.UserId WHERE

问题 I am attempting to dynamically build a T-SQL statement based on a FieldMapping table and some business rules. Cut the long story short, I have a function that will return the SQL statement as a varchar(max) that I will execute as EXEC (@Sql) in my stored procedure. Allow me to demonstrate with a test table create procedure [dbo].[sp_TestInsert] ( @Id int, @Name varchar(20), @Surname varchar(20), @Age int, @Source varchar(1) ) as declare @sql varchar(max) -- Return SQL statement that depends

问题 Regarding a question and its related answer, I'm trying to create a new table type using SQL queries and run a join query on data which are of this table type. I put both queries in the same script, i.e. create type and select but it is not working. My query is as below (the whole code is brought in the end of question): IF TYPE_ID(N'BranchMappingType') IS NULL CREATE TYPE BranchMappingType As Table (COL_ServerID int, COL_ServerSchema Common._SMALL_, COL_TableName Common._SMALL_, COL_BranchNo

问题 It's my first SQL Parametrized update command in c# and i have a syntax error when i exectued my update. Here is my code : string maRequete = "UPDATE " + strNomTable + " set " + "evetype = @evetype ," + "evedes = @evedes ," + "evecli = @evecli ," + "eveusermo = @eveusermo ," + "eveinterv = @eveinterv where eveNum = " + '"' + strEvtNumeroString.ToString() + '"'; OleDbCommand DbCommand = new OleDbCommand(maRequete); DbCommand.Parameters.Add("@evetype", OleDbType.VarChar); DbCommand.Parameters

问题 This UdtTypeName property is required to read or write Geography, Geometry or HierarchyId. I can't find any workaround or post/information on this subject. Does anyone have an explanation? 回答1: This is not implementend in netcoreapp1.1. There is an issue about that in the dotnet corefx project, referencing all the missing API of System.Data.SqlClient, and especially about UdtTypeName: https://github.com/dotnet/corefx/issues/17126 来源： https://stackoverflow.com/questions/44315760/no

问题 i have a list that i am pulling things out of to insert into a database. This is not going to be a web app so i have just been doing as follows: string sqlStorage = (null,"asd"), for (int i = 1; i < listsize; ) { sqlStorage = sqlStorage + "(null,someVariableFromLoop)"; i++ } string connString = "Server=localhost;..........."; MySqlConnection conn = new MySqlConnection(connString); MySqlCommand command = conn.CreateCommand(); command.CommandText = @"INSERT INTO table1 VALUES " + tempSQLStorage

问题 how to pass sql parameter as null value in to integer data type variable ? StockBO sBO = new StockBO(); sBO.Mode = 2; if (ddcmpanyname.SelectedIndex != 0) { sBO.Client_id = Convert.ToInt16(ddcmpanyname.SelectedValue); } else { sBO.Client_id = Convert.ToInt16(DBNull.Value);//Object cannot be cast from DBNull to other types. sBO.Client_id =DBNull.Value;//Cannot implicitly convert type } ds=_StockController.StockGet(sBO); i changed the code like this it gives error like i my comment check else

问题 I am retrieving a moderate amount of data and processing it - nothing unique there. What was odd at first was that with some sets of data, it worked fine, and with others, I got the following err msg: This err msg seems to be total hogwash, though (misleading, at any rate), because there is no more data with the failing set than with the successful set, and so it shouldn't take any longer to run the "bad" data than the good. Mor enlightening, perhaps, are the other err msgs that appear after

问题 This question evolved from this one. I have two tables that I need to query and glean some calculated sums from; I need a result set based on units -- one row for each Unit, with calculated data for them folded into that row. The two tables contain the following pertinent members: CustomerCategoryLog : Unit varchar(25) MemberNo varchar(10) Category varchar(50) Subcategory varchar(50) BeginDate Datetime EndDate Datetime ReportingMonthlySales : Unit (VarChar) MemberNo (VarChar) MonthlySales

问题 I am already pulling the parameters from the stored proc sent in like this: foreach (SqlParameter param in cmd.Parameters) { if ((param.Direction == ParameterDirection.Input) || (param.Direction == ParameterDirection.InputOutput)) { jsonReturn += "{\"paramName\":\"" + param.ParameterName + "\", \"paramType\":\"" + param.SqlDbType.ToString() + "\"},"; } } I looked into the SqlParameter object and could not find a way to see if it could tell me whether the Parameter had a default value...