electric dao

dao文件/electriDao.java

@@ -0,0 +1,179 @@
+package com.dao;
+
+
+
+import com.bean.electric_addBean;
+import com.db.DBHelper;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+public class electriDao {
+    //获取列表
+
+    public List<electric_addBean> GetList(String strwhere,String strorder){
+      String sql="select * from electric";
+       if(!(isInvalid(strwhere)))
+       {
+           sql+=" where "+strwhere;
+       }if(!(isInvalid(strorder)))
+       {
+          sql+=" order by "+strorder;
+      }
+       Statement stat = null;
+       ResultSet rs = null;
+      Connection conn = new DBHelper().getConn();
+       List<electric_addBean> list=new ArrayList<electric_addBean>();
+       try{
+            stat = conn.createStatement();
+         rs = stat.executeQuery(sql);
+           while(rs.next()){
+               electric_addBean cnbean=new electric_addBean();
+               cnbean.setElectric_ID(rs.getInt("Electric_ID"));
+               cnbean.setElectric_Dormitory_Number(rs.getString("Electric_Dormitory_Number"));
+               cnbean.setElectric_Residual(rs.getString("Electric_Residual"));
+               list.add(cnbean);
+         }
+       } catch (SQLException e) {
+           e.printStackTrace();
+      } finally {
+           try {
+               if (conn != null)
+                   conn.close();
+               if (stat != null)
+                  stat.close();
+              if (rs != null)
+                  rs.close();
+           } catch (SQLException e) {
+               e.printStackTrace();
+           }
+       }
+       return list;
+   }
+
+    public electric_addBean GetBean(int id){
+        String sql="select * from electric where Electric_ID="+id;
+        Statement stat = null;
+        ResultSet rs = null;
+        Connection conn = new DBHelper().getConn();
+        electric_addBean cnbean=new electric_addBean();
+        try{
+            stat = conn.createStatement();
+            rs = stat.executeQuery(sql);
+            while(rs.next()){
+//                cnbean.setTeacher_ID(rs.getInt("Teacher_ID"));
+                cnbean.setElectric_ID(rs.getInt("Electric_ID"));
+                cnbean.setElectric_Dormitory_Number(rs.getString("Electric_Dormitory_Number"));
+                cnbean.setElectric_Residual(rs.getString("Electric_Residual"));
+
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                if (conn != null)
+                    conn.close();
+                if (stat != null)
+                    stat.close();
+                if (rs != null)
+                    rs.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+        return  cnbean;
+    }
+    public void Add(electric_addBean cnbean){
+        String sql="insert into electric (";
+        sql+="Electric_ID,Electric_Dormitory_Number,Electric_Residual";
+        sql+=") values(";
+        sql+="'"+cnbean.getElectric_ID()+"','"+cnbean.getElectric_Dormitory_Number()+"','"+cnbean.getElectric_Residual()+"'";
+        sql+=")";
+        Statement stat = null;
+        ResultSet rs = null;
+        Connection conn = new DBHelper().getConn();
+        try{
+            stat = conn.createStatement();
+            stat.executeUpdate(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                if (conn != null)
+                    conn.close();
+                if (stat != null)
+                    stat.close();
+                if (rs != null)
+                    rs.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+    //修改
+    public void Update(electric_addBean cnbean){
+        String sql="update electric set ";
+        //sql+="Electric_Domitory_Number='"+cnbean.getElectric_Dormitory_Number()+"',";
+        sql+="Electric_Residual='"+cnbean.getElectric_Residual()+"'";
+//        sql+="Student_Password='"+cnbean.getStudent_Password()+"',";
+
+        sql+=" where Electric_ID='"+cnbean.getElectric_ID()+"'";
+        Statement stat = null;
+        ResultSet rs = null;
+        Connection conn = new DBHelper().getConn();
+        try{
+            stat = conn.createStatement();
+            stat.executeUpdate(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                if (conn != null)
+                    conn.close();
+                if (stat != null)
+                    stat.close();
+                if (rs != null)
+                    rs.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+    public electric_addBean GetAllBean(int id){
+        String sql="select * from electric where Electric_ID="+id;
+        Statement stat = null;
+        ResultSet rs = null;
+        Connection conn = new DBHelper().getConn();
+        electric_addBean cnbean=new electric_addBean();
+        try{
+            stat = conn.createStatement();
+            rs = stat.executeQuery(sql);
+            while(rs.next()){
+                cnbean.setElectric_ID(rs.getInt("Electric_ID"));
+                cnbean.setElectric_Dormitory_Number(rs.getString("Electric_Dormitory_Number"));
+                cnbean.setElectric_Residual(rs.getString("Electric_Residual"));
+
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                if (conn != null)
+                    conn.close();
+                if (stat != null)
+                    stat.close();
+                if (rs != null)
+                    rs.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+        return cnbean;
+    }
+    private boolean isInvalid(String value) {
+        return (value == null || value.length() == 0);
+    }
+}