Error inserting data using SqlBulkCopy

Question

Error inserting data using SqlBulkCopy

ado.net c# datetime sqlbulkcopy sql-server

Question

I'm trying to batch insert data into SQL 2008 using SqlBulkCopy.

Here is my table:

IF OBJECT_ID(N'statement', N'U') IS NOT NULL
DROP TABLE [statement]
GO
CREATE TABLE [statement](
  [ID] INT IDENTITY(1, 1) NOT NULL,
  [date] DATE NOT NULL DEFAULT GETDATE(),
  [amount] DECIMAL(14,2) NOT NULL,
CONSTRAINT [PK_statement] PRIMARY KEY CLUSTERED
(
    [ID] ASC
) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

Here is my code:

private DataTable GetTable()
{
    var list = new List<DataColumn>();
    list.Add(new DataColumn("amount", typeof(SqlDecimal)));
    list.Add(new DataColumn("date", typeof(SqlDateTime)));

    var table = new DataTable("statement");
    table.Columns.AddRange(list.ToArray());

    var row = table.NewRow();
    row["amount"] = (SqlDecimal)myObj.Amount; // decimal Amount { get; set; }
    row["date"] = (SqlDateTime)myObj.Date; // DateTime Date { get; set }
    table.Rows.Add(row);

    return table;
}

private void WriteData()
{
    using (var bulk = new SqlBulkCopy(strConnection, SqlBulkCopyOptions.KeepIdentity & SqlBulkCopyOptions.KeepNulls))
    {
        //table.Columns.ForEach(c => bulk.ColumnMappings.Add(new SqlBulkCopyColumnMapping(c.ColumnName, c.ColumnName)));
        bulk.BatchSize = 25;
        bulk.DestinationTableName = "statement";
        bulk.WriteToServer(GetTable()); // a table from GetTable() 
    }
}

So I'm getting error:

The given value of type SqlDateTime from the data source cannot be converted to type date of the specified target column.

Why?? How can I fix that? Help me, please!

abatishchev

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Accepted Answer

Using your original table script, the following code works.

private static DataTable GetTable()
{
    var list = new List<DataColumn>();
    list.Add(new DataColumn("amount", typeof(Double)));
    list.Add(new DataColumn("date", typeof(DateTime)));
    var table = new DataTable("statement");
    table.Columns.AddRange(list.ToArray());

    var row = table.NewRow();
    row["amount"] = 1.2d;
    row["date"] = DateTime.Now.Date;

    table.Rows.Add(row);
    return table;
}
private static void WriteData()
{
    string strConnection = "Server=(local);Database=ScratchDb;Trusted_Connection=True;";
    using (var bulk = new SqlBulkCopy(strConnection, SqlBulkCopyOptions.KeepIdentity & SqlBulkCopyOptions.KeepNulls))
    {
        bulk.ColumnMappings.Add(new SqlBulkCopyColumnMapping("amount", "amount"));
        bulk.ColumnMappings.Add(new SqlBulkCopyColumnMapping("date", "date"));
        bulk.BatchSize = 25;
        bulk.DestinationTableName = "statement";
        bulk.WriteToServer(GetTable());
    }
}

As already stated by Amal, you need the column mappings because of the Identity column.

Accepted Answer

SqlDateTime represents the original datetime type. Have you tried just using the DateTime .NET type in the DataTable? I would hope that it can convert this to either the TSQL datetime or date types. Ditto decimal instead of SqlDecimal.

Error inserting data using SqlBulkCopy

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Accepted Answer

Expert Answer

Performance

Expression Evaluator