使用SSIS脚本任务将数据从多个SQL表导出到不同的平面文件

Question

我正在尝试创建一个数据网格并使用VB.NET将内容导出到文本文件,我在SSIS脚本任务中执行此操作,以便自动执行将动态表格导出到文本文件的过程.我没有收到任何错误,文件已创建,但文件为空.

我在这段代码中做错了什么？

Public Sub Main()

    Dim FName As String = "D:\test.TXT"

    ''''''''''''''''''''''''''''''''''''''''''
    If File.Exists(FName) Then
        File.Delete(FName)
    End If
    ''''''''''''''''''''''''''''''''''''''''''

    Dim myConnection As OleDbConnection = New OleDbConnection("Data Source=localhost;Provider=SQLNCLI10;Initial Catalog=AdventureWorksDW2008R2;Integrated Security=SSPI;")
    Dim da As OleDbDataAdapter = New OleDbDataAdapter("Select * from Table")
    Dim ds As DataSet = New DataSet

    da.Fill(ds, "Test")

    Dim DataGrid1 As New DataGrid
    DataGrid1.DataSource = ds.DefaultViewManager
    Dim DataGridView1 As New DataGridView

    DataGridView1.DataSource = ds

    Dim dgvc As DataGridViewCell
    Dim sw As New System.IO.StreamWriter(FName)

    For Each dgvr As DataGridViewRow In DataGridView1.Rows

        Dim intCellCount As Integer = dgvr.Cells.Count
        Dim intCounter As Integer = 1

        For Each dgvc In dgvr.Cells()
            If intCounter <> intCellCount Then
                sw.Write(dgvc.Value.ToString & "|")
            Else
                sw.WriteLine(dgvc.Value.ToString)
            End If

            intCounter += 1
        Next
    Next

    Dts.TaskResult = ScriptResults.Success

End Sub

Answer 1

这是使用将不同结构的表导出到平面文件的可能方法Script Task.此示例将使用"脚本任务"将包含不同字段和数据的两个表导出到平面文件.为了导出数据,您可以使用DataReader而不是使用DataGrid.可能有其他可能的方法来做到这一点.

分步过程:

1. 创建三个名为的表dbo.TablesList, dbo.Source1并 dbo.Source2使用SQL Scripts部分下给出的脚本.
2. 填充表dbo.TablesList, dbo.Source1并在屏幕截图#所示的数据`dbo.Source2`` 1.
3. 在SSIS包上Connection manager,创建一个OLE DB connection命名的SQLServer以连接到SQL Server实例,如屏幕截图#2所示.
4. 在包中,创建4个变量,如屏幕截图#3所示.
5. 在控制流中,放置一个Execute SQL Task,一个Foreach Loop Container和Script Task内Foreach loop container屏幕截图#如图4.
6. 配置Execute SQL task如屏幕截图#5和#6所示.
7. 配置Foreach Loop container如屏幕截图#7和#8所示.
8. 使用该部分下给出的代码替换脚本任务中的Main方法Script Task Code.
9. 屏幕截图#9显示了包执行.
10. 屏幕截图#10 - #12显示使用脚本任务代码从SSIS导出的文件.

希望有所帮助.

SQL脚本:

CREATE TABLE [dbo].[Source1](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [ItemNumber] [varchar](20) NOT NULL,
    [ItemName] [varchar](50) NOT NULL,
CONSTRAINT [PK_Source1] PRIMARY KEY CLUSTERED ([Id] ASC)) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Source2](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [Country] [varchar](20) NOT NULL,
    [StateProvince] [varchar](50) NOT NULL,
CONSTRAINT [PK_Source2] PRIMARY KEY CLUSTERED ([Id] ASC)) ON [PRIMARY]
GO

CREATE TABLE [dbo].[TablesList](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [TableName] [varchar](50) NOT NULL,
    [FilePath] [varchar](255) NOT NULL,
CONSTRAINT [PK_Tables] PRIMARY KEY CLUSTERED ([Id] ASC)) ON [PRIMARY]
GO

脚本任务代码:(使用下面给出的代码替换脚本任务中的Main()方法)

VB Main()方法代码,可用于SSIS 2005 and above:

Public Sub Main()

    Dim varCollection As Variables = Nothing

    Dts.VariableDispenser.LockForRead("User::TableName")
    Dts.VariableDispenser.LockForRead("User::FileName")
    Dts.VariableDispenser.LockForRead("User::Delimiter")
    Dts.VariableDispenser.GetVariables(varCollection)

    Dim fileName As String = varCollection("User::FileName").Value.ToString()
    Dim query As String = "SELECT * FROM " & varCollection("User::TableName").Value.ToString()
    Dim delimiter As String = varCollection("User::Delimiter").Value.ToString()

    Dim writer As StreamWriter = Nothing
    Dim connection As OleDbConnection = New OleDbConnection(Dts.Connections("SQLServer").ConnectionString)
    Dim command As OleDbCommand = Nothing
    Dim reader As OleDbDataReader = Nothing

    Try
        If File.Exists(fileName) Then
            File.Delete(fileName)
        End If

        connection.Open()
        command = New OleDbCommand(query, connection)
        reader = command.ExecuteReader()

        If reader.HasRows Then

            writer = New System.IO.StreamWriter(fileName)
            Dim row As Integer = 0
            While reader.Read()

                Dim header As Integer = 0
                Dim counter As Integer = 0
                Dim fieldCount As Integer = reader.FieldCount - 1

                If row = 0 Then
                    While header <= fieldCount
                        If header <> fieldCount Then
                            writer.Write(reader.GetName(header).ToString() & delimiter)
                        Else
                            writer.WriteLine(reader.GetName(header).ToString())
                        End If
                        header += 1
                    End While
                End If

                While counter <= fieldCount
                    If counter <> fieldCount Then
                        writer.Write(reader(counter).ToString() & delimiter)
                    Else
                        writer.WriteLine(reader(counter).ToString())
                    End If
                    counter += 1
                End While

                row += 1
            End While
        End If
    Catch ex As Exception
        Throw ex
    Finally
        connection.Close()
        writer.Close()
    End Try

    Dts.TaskResult = ScriptResults.Success

End Sub

截图#1:

截图#2:

截图#3:

截图#4:

截图#5:

截图#6:

截图#7:

截图#8:

截图#9:

截图#10:

截图#11:

截图#12: