摘要： Java IO中的FileReader 和 FileWriter读写文件,和创建多级文件夹博客分类：JavaEEJavaCC++C#SUNJava代码packagepack.java.io;importjava.io.BufferedInputStream;importjava.io.File;im... 阅读全文

摘要： //获取当前图层，并把它设置成IGeoFeatureLayer的实例 IMap pMap = axMapControl1.Map; ILayer pLayer = pMap.get_Layer(0) as IFeatureLayer; IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer; IGeoFeatureLayer pGeoFeatureLayer = pLayer as IGeoFeatureLayer; pGeoFeatureLayer.ScaleSymbols = false ; //获取图层上的feature IFeatu. 阅读全文

摘要： select a.*,b.字段1,b.字段2,b.字段3,b.字段4,c.字段1表1 a LEFT JOIN表2 b on a.某字段 = b.某字段 LEFT JOIN表3 c on a.某字段 = c.某字段 ORDER BY a.某字段 desc 阅读全文

摘要： /// <summary>/// 更新一条数据/// </summary>public void Update(ZPY.Model.News model){StringBuilder strSql=new StringBuilder();strSql.Append("update News set ");strSql.Append("NewsTitle=@NewsTitle,");strSql.Append("NewsContent=@NewsContent,");strSql.Append("New 阅读全文

摘要： #region 连接本地数据库 private OleDbConnection con; /// <summary> /// 打开数据库连接 /// </summary> /// <param name="DBpath">数据库路径(包括数据库名)</param> private void Open(String DBpath) { if (con == null) con = new OleDbConnection(@" Provider = Microsoft.Jet.OLEDB.4.0 ; Data Sourc 阅读全文

摘要： using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using ESRI.ArcGIS.Geometry;using ESRI.ArcGIS.esriSystem;using ESRI.ArcGIS.Carto;using ESRI.ArcGIS.Controls;namespace ArcMap{ public partial cl 阅读全文

摘要： 打开地图：主要用到IMapDocument的Open()方法，此方法用于将数据导入IMapDocument的实例并与AxMapControl（主地图）控件实例相连；然后用IMapDocument的get_Map（）方法将图层添加到地图控件中。保存地图：主要用到IMapDocument的Open()方法，必须的一步，用于将AxMapControl的实例的DocumentFileName传递给IMapDocument的实例，此处是我出问题严重的地方，幸好在志鸿师兄的指导下完成；此句的缺失会导致调用IMapDocument的get_IsReadOnly()方法时出现“完成该操作所需的数据不可用”的错 阅读全文

摘要： 数学函数1.绝对值S:select abs(-1) valueO:select abs(-1) value from dual2.取整(大)S:select ceiling(-1.001) valueO:select ceil(-1.001) value from dual3.取整（小）S:select floor(-1.001) valueO:select floor(-1.001) value from dual4.取整（截取）S:select cast(-1.002 as int) valueO:select trunc(-1.002) value from dual5.四舍五入S:se 阅读全文

摘要： 表名“TH_PRIVILEGE”查询语句：with tt(l,ID,NAME,PID) as(select l=case when PID IS null then 1 when PID IS not null then 2 end,ID,NAME,PID from TH_PRIVILEGE union allselect l=case when t1.PID IS null then 1 when t1.PID IS not null then 2 end,t1.ID,t1.NAME,t1.PID from TH_PRIVILEGE t1inner join tt b on t1.ID=.. 阅读全文

摘要： /// <summary> /// 自动标注图层 /// </summary> /// <param name="pGeoFlyr">矢量图层对象</param> /// <param name="pAutoLbl">动态标注对象</param> public void SetLayerAutoLabel(IGeoFeatureLayer pGeoFlyr) { try { if (pGeoFlyr == null) return; IAnnotateLayerPropertiesC 阅读全文