ArcEngine,C#数据删除几种方法以及性能比较

一、 几种删除方法代码

1. 查询结果中删除

private void Delete1(IFeatureClass PFeatureclass)

{

IQueryFilter pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "objectID<=" + DeleteNum;

IFeatureCursor pFeatureCursor = PFeatureclass.Search(pQueryFilter, false); IFeature pFeature = pFeatureCursor.NextFeature();

while (pFeature != null)

{

pFeature.Delete();

pFeature = pFeatureCursor.NextFeature();

}

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

}

2. 更新游标删除

private void Delete2(IFeatureClass PFeatureclass)

{

IQueryFilter pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "objectID<=" + DeleteNum;

IFeatureCursor pFeatureCursor = PFeatureclass.Update(pQueryFilter, false);

IFeature pFeature = pFeatureCursor.NextFeature();

while (pFeature != null)

{

pFeatureCursor.DeleteFeature();

pFeature = pFeatureCursor.NextFeature();

}

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

}

3. 使用DeleteSearchedRows删除

private void Delete4(IFeatureClass PFeatureclass)

{

IQueryFilter pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "objectID<=" + DeleteNum;

ITable pTable = PFeatureclass as ITable;

pTable.DeleteSearchedRows(pQueryFilter);

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

}

4. ExecuteSQL删除

private void Delete4(IFeatureClass PFeatureclass)

{

IDataset pDataset = PFeatureclass as IDataset;

pDataset.Workspace.ExecuteSQL("delete from " + PFeatureclass.AliasName + " where objectid<=" + DeleteNum);

}

二、 测试性能和比较

1、 相同的数据条件，删除2000条记录

2、 测试代码

IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;

IFeatureClass PFeatureClass = pFeatureLayer.FeatureClass;

System.Diagnostics.Stopwatch MyWatch = new System.Diagnostics.Stopwatch();

MyWatch.Start();

Delete1(PFeatureClass)

//Delete2(PFeatureClass);

//Delete3(PFeatureClass);

//Delete4(PFeatureClass);

//Delete5(PFeatureClass);

MyWatch.Stop();

MessageBox.Show("删除时间:" + MyWatch.ElapsedMilliseconds.ToString() + "毫秒");

3、 测试情况

测试方法

第一次时间（单位ms）

第一次时间（单位ms）

1

5214ms

5735ms

2

299ms

290Ms

3

59ms

28ms

4

26ms

26ms

三、 结论

1、 使用ExecuteSQL删除最快，数据库的效率最高。

2、 DeleteSearchedRows和ExecuteSQL属于批量删除，性能较优。

3、 查询结果中删除，速度最慢，如果你使用这种方法，建立你马上修改你的程序，因为你在浪费时间。

4、 小数据量记录数小于500000条，请使用DeleteSearchedRows或ExecuteSQL，否则使用更新游标删除(方法2)，加上进度条，这样界面很友好。

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