基于ArcGIS10.0和Oracle10g的空间数据管理平台十三（C#开发）-空间数据导出

前面有几篇文章专门介绍了空间数据的导入，导入的目的是为了统一管理。今天介绍空间数据导出，导出的格式支持和导入的格式一样，导出的目的是为了方便数据的迁移。其实导入和导出用到的技术基本上都是相同的，不过为了介绍的完整性还是单独拿出来，因为这一部分的功能也是很重要而且是必不可少的！

1.首先定义一个用于操作SDE数据库的工作空间并且在构造函数中初始化（调用工具类里面提供的静态方法初始化）：

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private IFeatureWorkspace pWorkspaceSDE;//定义SDE工作空间

public FrmDataExport()

{

InitializeComponent();

if (pWorkspaceSDE == null)

{

pWorkspaceSDE = MapOperation.GetFeatrueWorkspace();

}

}

2.列出所有数据表：供用户选择需要导出的数据，每一个表是一个可选项，这样用户可以一次导出多个需要的数据表。

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/// <summary>

/// 列出所有的表信息

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void FrmDataExport_Load(object sender, EventArgs e)

{

SqlHelper sh = new SqlHelper();

string sql = string.Empty;

sql = "select table_name,table_mapname,type from layer l,element e where "

+ "e.id=l.pid and e.category='矢量数据'";

OracleDataReader odr = sh.ReturnDataReader(sql);

object[] obj = new object[4];

while (odr.Read())

{

obj[0] = false;

obj[1] = odr[0].ToString();

obj[2] = odr[2].ToString();

obj[3] = odr[1].ToString();

dataGridViewX1.Rows.Add(obj);

}

comboBoxEx1.SelectedIndex = 0;

}

3.根据选择的导出数据格式打开相应的文件

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/// <summary>

/// 根据选择的导出数据格式打开相应的文件

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void selectPathBtn_Click(object sender, EventArgs e)

{

//根据导出数据格式打开相应的文件

switch (comboBoxEx1.SelectedIndex)

{

case 0:

{

FolderBrowserDialog folder = new FolderBrowserDialog();

if (folder.ShowDialog() == DialogResult.OK)

{

if (folder.SelectedPath != "")

{

selectPathTxt.Text = folder.SelectedPath;

}

}

}

break;

case 1:

{

OpenFileDialog ofd = new OpenFileDialog();

ofd.Filter = "MDB文件(.mdb) | *.mdb";

ofd.CheckFileExists = false;

if (ofd.ShowDialog() == DialogResult.OK)

{

if (ofd.FileName != "")

{

selectPathTxt.Text = ofd.FileName;

}

}

}

break;

default:

break;

}

}

4.执行具体的导出功能：一起准备工作都做好了就开始执行具体的导出功能了，根据不同的格式执行相应导出格式的功能。

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/// <summary>

/// 执行具体的导出功能

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void exportBtn_Click(object sender, EventArgs e)

{

if (selectPathTxt.Text == "")

{

MessageBox.Show("请选择导出路劲");

return;

}

IWorkspaceFactory pWF = null;

switch (comboBoxEx1.SelectedIndex)

{

case 0:

{

if (!File.Exists(selectPathTxt.Text))

{

}

//创建一个输出shp文件的工作空间

pWF = new ShapefileWorkspaceFactoryClass();

IFeatureWorkspace pFW = pWF.OpenFromFile(selectPathTxt.Text, 0) as IFeatureWorkspace;

IWorkspace pW = pFW as IWorkspace;

for (int i = 0; i < dataGridViewX1.Rows.Count; ++i)

{

if (bool.Parse(dataGridViewX1.Rows[i].Cells[0].Value.ToString()))

{

if (dataGridViewX1.Rows[i].Cells[2].Value.ToString() != "PA")

{

string str = dataGridViewX1.Rows[i].Cells[1].Value.ToString();

MapOperation.ConvertFeatureClass(pWorkspaceSDE as IWorkspace,

pW, str, str, 4326);

}

else

{

MessageBox.Show("属性表不能够导出为Shape文件");

}

}

}

MessageBox.Show("导出数据完成!");

}

break;

case 1:

{

// Instantiate an Access workspace factory and create a new personal geodatabase.

pWF = new AccessWorkspaceFactoryClass();

IWorkspaceName pWN = pWF.Create(Path.GetDirectoryName(selectPathTxt.Text),

Path.GetFileName(selectPathTxt.Text),null, 0);

// Cast the workspace name object to the IName interface and open the workspace.

IName pN = (IName)pWN;

IWorkspace pW = (IWorkspace)pN.Open();

for (int i = 0; i < dataGridViewX1.Rows.Count; ++i)

{

if (bool.Parse(dataGridViewX1.Rows[i].Cells[0].Value.ToString()))

{

string str = dataGridViewX1.Rows[i].Cells[1].Value.ToString();

if (dataGridViewX1.Rows[i].Cells[2].Value.ToString() != "PA")

{

MapOperation.ConvertFeatureClass(pWorkspaceSDE as IWorkspace,

pW, str, str, 4326);

}

else

{

ITable pSourceT = pWorkspaceSDE.OpenTable(str);

IFeatureWorkspace pFW = pW as IFeatureWorkspace;

ITable pTargetT = pFW.CreateTable(str, pSourceT.Fields, null, null, "");

FusedIndexTable(ref pSourceT, ref pTargetT);

}

}

}

MessageBox.Show("导出数据完成!");

}

break;

default:

break;

}

}

5.如果导出的数据表或文件已经存在就以追加的方式导出数据

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/// <summary>

/// 如果目的数据库中已经有表，则将新的记录追加进去

/// </summary>

/// <param name="FromTable">导出表</param>

/// <param name="ToTable">导入表</param>

private void FusedIndexTable(ref ITable FromTable, ref ITable ToTable)

{

if (FromTable == null || ToTable == null)

{

return;

}

IRow pFromRow;

ICursor pToCursor, pFromCursor;

IRowBuffer pToRowBuffer;

int pIndex;

pToRowBuffer = ToTable.CreateRowBuffer();

pToCursor = ToTable.Insert(true);

pFromCursor = FromTable.Search(null, false);

pFromRow = pFromCursor.NextRow();

while (pFromRow != null)

{

for (int i = 0; i < pFromRow.Fields.FieldCount; i++)

{

pIndex = pToRowBuffer.Fields.FindField(pFromRow.Fields.get_Field(i).Name.Trim());

if (pFromRow.Fields.get_Field(i).Editable && pIndex > -1)

{

pToRowBuffer.set_Value(pIndex, pFromRow.get_Value(i));

}

}

pToCursor.InsertRow(pToRowBuffer);

pFromRow = pFromCursor.NextRow();

}

System.Runtime.InteropServices.Marshal.ReleaseComObject(pToCursor);

pFromRow = null;

pFromCursor = null;

pToRowBuffer = null;

}

6.总结：这里用到的大部分技术在前面都介绍过了，这里不过是不同的业务逻辑而已，其实很多的时候高深的技术并不会用到很多，主要是处理好各个功能的业务逻辑，至于用什么样的技术实现都是可以的！