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
最佳答案
这是使用 Script Task
将不同结构的表导出到平面文件的可能方法。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:
dbo.TablesList
、 dbo.Source1
和 dbo.Source2
的表。 dbo.TablesList
、 dbo.Source1
和 `dbo.Source2``。 Connection manager
上,创建一个名为 SQLServer 的 OLE DB connection
以连接到 SQL Server 实例,如截图 # 2 所示。 Execute SQL Task
、一个 Foreach Loop Container
和一个 Script Task
放在 Foreach loop container
中,如截图 # 4 所示。 Execute SQL task
。 Foreach Loop container
。 Script Task Code
部分下给出的代码。 希望有帮助。
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,可以在
SSIS 2005 and above
中使用: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
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关于vb.net - 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,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6216486/