Question

嗨我有测试文件夹，每天我们复制一个csv文件我们不使用任何代码复制文件我们只是从本地拖放。 CSV文件有11列，但我想在sql中只有3列数据。所以我在sql中创建了3列。我的目标是从文件夹中读取文件并将这3列数据插入到sql中。我将每天使用任务调度程序运行任务，如果文件在文件夹中找到它需要将数据导入到sql

Answer 1

这将为你做到。只需选择要加载的字段（列）即可。

Protected Sub uploadButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles uploadButton.Click

    ' declare CsvDataReader object which will act as a source for data for SqlBulkCopy
    Using csvData = New CsvDataReader(new StreamReader(fileUpload.PostedFile.InputStream, True))
        ' will read in first record as a header row and
        ' name columns based on the values in the header row
        csvData.Settings.HasHeaders = True

        ' must define data types to use while parsing data
        csvData.Columns.Add("varchar") ' First
        csvData.Columns.Add("varchar") ' Last
        csvData.Columns.Add("datetime") ' Date
        csvData.Columns.Add("money") ' Amount

        ' declare SqlBulkCopy object which will do the work of bringing in data from
        ' CsvDataReader object, connecting to SQL Server, and handling all mapping
        ' of source data to destination table.
        Using bulkCopy = New SqlBulkCopy("Data Source=.;Initial Catalog=Test;User ID=sa;Password=")
            ' set the name of the destination table that data will be inserted into.
            ' table must already exist.
            bulkCopy.DestinationTableName = "Customer"

            ' mappings required because we're skipping the customer_id column
            ' and letting SQL Server handle auto incrementing of primary key.
            ' mappings not required if order of columns is exactly the same
            ' as destination table definition. here we use source column names that
            ' are defined in header row in file.
            bulkCopy.ColumnMappings.Add("First", "first_name") ' map First to first_name
            bulkCopy.ColumnMappings.Add("Last", "last_name") ' map Last to last_name
            bulkCopy.ColumnMappings.Add("Date", "first_sale") ' map Date to first_sale
            bulkCopy.ColumnMappings.Add("Amount", "sale_amount") ' map Amount to sale_amount

            ' call WriteToServer which starts import
            bulkCopy.WriteToServer(csvData)

        End Using ' dispose of SqlBulkCopy object

    End Using ' dispose of CsvDataReader object

End Sub ' end uploadButton_Click

从CSV文件读取数据并使用vb.net插入SQL

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