我正在尝试将我的 DataTable
传递给存储过程。 DataTable
包含 Excel 工作表的内容。 Excel 工作表有两个空列,五个是文本,五个是小数。
空列是 OppdragsMVAkode
和 OppdragsgebyrMVAkode
。
如果我运行我的应用程序,我会得到这个异常:
System.ArgumentException: Input string was not in a correct format. Couldn't store <> in OppdragsMVAkode Column. Expected type is Decimal.
如果我添加一个临时号码,我会得到这个异常:
System.Data.SqlClient.SqlException: Error converting data type nvarchar to numeric.
我不明白为什么要将它作为字符串读取。
我的存储过程(spGetTrips
):
ALTER PROCEDURE [dbo].[spGetTrips]
@trips udtTripsPerMonth readonly
AS
BEGIN
INSERT INTO tblTripsPerMonth
SELECT
[KjøretøyID],
SUBSTRING([År], 7, 4),
SUBSTRING([Måned], 4, 2),
[Betaling (brutto)],
[Betaling (netto)],
[Bestillingsgebyr (netto)],
[Betalingsgebyr (netto)],
[OppdragsMVAkode],
CONCAT(LøyvehaverFakturaID, + 'UF-' + SUBSTRING([År], 9, 2) + SUBSTRING([Måned], 4, 2)),
[Oppdragsgebyr (netto)],
[OppdragsgebyrMVAkode],
CONCAT([RidelRegionFakturaID], + 'UF-' + SUBSTRING([År], 9, 2) + SUBSTRING([Måned], 4, 2))
FROM @trips
UPDATE tblTripsPerMonth
SET [OppdragsMVAkode] = (
SELECT [ID]
FROM [tblMVAkoder]
WHERE [ID] = 'MVAkode2'
);
UPDATE tblTripsPerMonth
SET [OppdragsgebyrMVAkode] = (
SELECT [ID]
FROM [tblMVAkoder]
WHERE [ID] = 'MVAkode5'
);
END
正如您在上面看到的,我在存储过程中使用 UPDATE
子句设置两个空列的值。无论它们在 Excel 工作表中为空,还是具有一些初步值,然后被覆盖,我都不关心 - 我只是希望它能正常工作。
这是我的用户定义表类型 (udtTripsPerMonth
):
CREATE TYPE [dbo].[udtTripsPerMonth] AS TABLE(
[KjøretøyID] [nvarchar](50) NULL,
[År] [nvarchar](50) NULL,
[Måned] [nvarchar](50) NULL,
[Betaling (brutto)] [decimal](10, 2) NULL,
[Betaling (netto)] [decimal](10, 2) NULL,
[Bestillingsgebyr (netto)] [decimal](10, 2) NULL,
[Betalingsgebyr (netto)] [decimal](10, 2) NULL,
[OppdragsMVAkode] [decimal](10, 2) NULL,
[LøyvehaverFakturaID] [nvarchar](50) NULL,
[Oppdragsgebyr (netto)] [decimal](10, 2) NULL,
[OppdragsgebyrMVAkode] [decimal](10, 2) NULL,
[RidelRegionFakturaID] [nvarchar](50) NULL
)
GO
还有我的表(tblTripsPerMonth
):
CREATE TABLE [dbo].[tblTripsPerMonth](
[ID] [int] IDENTITY(1,1) NOT NULL,
[KjøretøyID] [nvarchar](50) NULL,
[År] [nvarchar](50) NULL,
[Måned] [nvarchar](50) NULL,
[Betaling (brutto)] [decimal](10, 2) NULL,
[Betaling (netto)] [decimal](10, 2) NULL,
[Bestillingsgebyr (netto)] [decimal](10, 2) NULL,
[Betalingsgebyr (netto)] [decimal](10, 2) NULL,
[OppdragsMVAkode] [decimal](10, 2) NULL,
[LøyvehaverFakturaID] [nvarchar](50) NULL,
[Oppdragsgebyr (netto)] [decimal](10, 2) NULL,
[OppdragsgebyrMVAkode] [decimal](10, 2) NULL,
[RidelRegionFakturaID] [nvarchar](50) NULL,
PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO
我在 UPDATE
子句 (tblMVAkoder
) 中引用的另一个表:
CREATE TABLE [dbo].[tblMVAkoder](
[ID] [nvarchar](50) NOT NULL,
[Startdato] [date] NULL,
[Sluttdato] [date] NULL,
[MVAsats] [decimal](10, 2) NULL,
PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO
这是我的 C# 代码(Excel 到 DataTable
):
private void btnExport_Click(object sender, RoutedEventArgs e) {
OpenFileDialog of = new();
of.Filter = "Excel Files | *.xlsx;";
of.Title = "Importer Excel fil.";
if (of.ShowDialog() == true) {
dgPaidTrip.ItemsSource = ImportExceltoDataTable(of.FileName).DefaultView;
btnClearForm.IsEnabled = true;
}
using (SqlConnection con = new(ConnectionString.connectionString))
using (var cmd = new SqlCommand("spGetTrips", con) { CommandType = CommandType.StoredProcedure }) {
con.Open();
DataTable dt = ImportExceltoDataTable(of.FileName);
cmd.Parameters.Add(new SqlParameter("@trips", dt));
cmd.ExecuteNonQuery();
}
}
public static DataTable ImportExceltoDataTable(string filePath) {
using (XLWorkbook wb = new(filePath)) {
IXLWorksheet ws = wb.Worksheet(1);
int tl_Row = ws.FirstCellUsed().Address.RowNumber;
int tl_Col = ws.FirstCellUsed().Address.ColumnNumber;
int br_Row = ws.LastCellUsed().Address.RowNumber;
int br_Col = ws.LastCellUsed().Address.ColumnNumber;
DataTable dt = new();
dt.Columns.Add("KjøretøyID", typeof(string));
dt.Columns.Add("År", typeof(string));
dt.Columns.Add("Måned", typeof(string));
dt.Columns.Add("Betaling (brutto)", typeof(decimal));
dt.Columns.Add("Betaling (netto)", typeof(decimal));
dt.Columns.Add("Bestillingsgebyr (netto)", typeof(decimal));
dt.Columns.Add("Betalingsgebyr (netto)", typeof(decimal));
dt.Columns.Add("OppdragsMVAkode", typeof(decimal));
dt.Columns.Add("LøyvehaverFakturaID", typeof(string));
dt.Columns.Add("Oppdragsgebyr (netto)", typeof(decimal));
dt.Columns.Add("OppdragsgebyrMVAkode", typeof(decimal));
dt.Columns.Add("RidelRegionFakturaID", typeof(string));
IXLRow currentRow;
for (int dtRow = 0; dtRow < br_Row - tl_Row; dtRow++) {
currentRow = ws.Row(tl_Row + dtRow + 1);
dt.Rows.Add();
for (int dtCol = 0; dtCol < br_Col - tl_Col + 1; dtCol++) {
dt.Rows[dtRow][dtCol] = currentRow.Cell(tl_Col + dtCol).Value;
}
}
return dt;
}
}
据我所知,我的所有列类型及其顺序都匹配。
我将所有类型更改为 nvarchar
,并且代码“有效”。
但是比我聪明的人告诉我,伪造列类型不是一个好主意。
我错过了什么?
最佳答案
要传递空值,您需要将列值设置为 DBNull.Value
。您可以像这样设置 DBNull
dt.Rows[dtRow][dtCol] = currentRow.Cell(tl_Col + dtCol).Value ?? (object)DBNull.Value;
您还必须设置 SqlDBType
TypeName
和 Direction
属性
cmd.Parameters.Add(
new SqlParameter("@trips", SqlDBType.Structured)
{
TypeName = "dbo.udtTripsPerMonth",
Direction = ParameterDirection.Input,
Value = dt
});
关于c# - SQL/C# : DataTable to stored procedure (INSERT from user-defined table type) - Converting error,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/69198578/