基幹系システムでCloud SQLは使えるか試してみた：Google Cloud SQLは基幹系で使えるのか（後編）（3/4 ページ）

package  com.business;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
@SuppressWarnings("serial")
public class bomSvlt extends HttpServlet{
    @Override
    public void doGet (HttpServletRequest req, HttpServletResponse res) 
    throws ServletException, IOException{
        String rv = "";
        req.setCharacterEncoding("utf-8");
        res.setContentType("text/html; charset=utf-8");
        PrintWriter out;
        out = res.getWriter();        
        String mode = req.getParameter("mode");                //（1）
        bomBean bom = new bomBean();                        //ビーンスインスタンスの生成
        if(mode.equals("getfinal_j")){                            //（2）
rv = bom.getFinal_j();                                //完成品
}else if(mode.equals("getchild_j")){
String p_item = req.getParameter("p_item");
rv = bom.getChild_j(p_item);                            //子部品
}else if(mode.equals("getiteminfo_j")){
String item_no = req.getParameter("item_no");
rv = bom.getItemInfo_j(item_no);                        //部品情報
    }
：

package  com.business;
import java.sql.*;
import java.util.List;
import com.google.appengine.api.rdbms.AppEngineDriver;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.EntityNotFoundException;
import com.google.appengine.api.datastore.FetchOptions;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import com.google.appengine.api.datastore.Query;
 
public class bomBean{        
    StringBuffer respBuf = new StringBuffer("");
    StringBuffer rv1 = new StringBuffer("");
    String rv = "";
    String db       = "business";
    String user     = "user1";
    String pass     = "pass1";
    Connection con  = null;
    DatastoreService ds = null;
    /* ****************************************** *
    *           コンストラクタ
    * ****************************************** */
    public bomBean(){
        try{
            DriverManager.registerDriver(new AppEngineDriver());
            con = DriverManager.getConnection("jdbc:google:rdbms://branecosmology:business/business",user,pass);    
                                                                //（1）　Cloud SQL
        } catch (SQLException e) {    
            respBuf.append("jdbc Driver load error<r>");            
        }
        ds = DatastoreServiceFactory.getDatastoreService();            //（2）　Bigtable
}    
：
    /* ****************************************** *
    *           完成品検索
    * ****************************************** */
    public String getFinal_j(){                                    //（3）
        try{
            Statement stmt = con.createStatement();
            String sql = "select distinct p_item from item_master where final='y' order by p_item";
                                                                //（4）
            ResultSet rset = stmt.executeQuery(sql);                    //（5）
            rv = "{ \"entries\":[";
            while(rset.next()){                                        //（6）
                String p_item = rset.getString("p_item");
                rv +=  "{\"p_item\": \"" + p_item + "\"},";
            }
            rv = rv.substring(0, rv.length() - 1);
            rv += "]}";
            rset.close();
            stmt.close();
        }catch(SQLException e){
            rv = "接続失敗\n理由：" + e.toString();
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try{
                con.close();
            }catch(Exception e){}
        }
        return rv;                                                //（7）
    }    
    /* ****************************************** *
    *           子部品検索
    * ****************************************** */
    public String getChild_j(String p_item){
        try{
            Statement stmt = con.createStatement();
            String sql = "select * from item_master where p_item='"+p_item+"' order by c_item";
                                                                        //（8）
            ResultSet rset = stmt.executeQuery(sql);                            //（9）
            rv = "{ \"entries\":[";
            while(rset.next()){
                String c_item = rset.getString("c_item");
                String make = rset.getString("make");
                String stock = rset.getString("stock");
                String vendor = rset.getString("vendor");
                rv += "{\"p_item\": \"" + p_item + "\",\"c_item\": \"" + c_item + "\", \"make\": \"" + make + "\", \"stock\": \"" + stock + "\", \"vendor\": \"" + vendor + "\"},";    //（10）
            }
            rv = rv.substring(0, rv.length() - 1);
            rv += "]}";
            rset.close();
            stmt.close();
        }catch(SQLException e){
            rv = "接続失敗\n理由：" + e.toString();
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try{
                con.close();
            }catch(Exception e){}
        }
        return rv;                                                        //（11）
    }
    /* ****************************************** *
    *           部品情報検索
    * ****************************************** */
    public String getItemInfo_j(String item_no){
        try{
            // Start Timer
            long start = System.currentTimeMillis();
            // Start Timer
            Statement stmt = con.createStatement();
            String sql = "select * from item_info where item_no='" + item_no + "';";
            ResultSet rset = stmt.executeQuery(sql);
            if(rset.next()){
                String item_name = rset.getString("item_name");
                String final_flag = rset.getString("final_flag");
                String vendor_no = rset.getString("vendor_no");
                String vendor_name = rset.getString("vendor_name");
                // End Timer
                long stop = System.currentTimeMillis();    
                long time = stop - start;    
                // End Timer
                rv =  "{\"stat\": \"" + time + "\",\"item_name\": \"" + item_name + "\", \"final_flag\": \"" + final_flag + "\", \"vendor_no\": \"" + vendor_no + "\", \"vendor_name\": \"" + vendor_name + "\"}";
            }else{
                rv = "NO<i>部品番号：" + item_no + "は存在しません。";
            }
            rset.close();
            stmt.close();
        }catch(SQLException e){
            rv = "接続失敗\n理由：" + e.toString();
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try{
                con.close();
            }catch(Exception e){}
        }
        return rv;
    }