ArcEngine数据删除几种方法和性能比较【转载】

1、IFeatureCursor 游标查询后，遍历删除

2、更新游标删除IFeatureCursor.DeleteFeature()

3、ITable.DeleteSearchedRows删除

4、 IDataset.Workspace.ExecuteSQL

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。