jdbc connect to the database (change)

package org.craf;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class FilterData {
        private Connection dbConnection = null;
    private Statement selectPro = null; //  Used to select operation
    private Statement updatePro = null; //  For update operations
    private ResultSet dbResultSet = null; //  Operating select the result set  

    private String driverName;//  MySql driver class declaration
    private String dbHost;
    private String dbPort;
    private String dbName;
    private String dbUserName;
    private String dbPassword;
    private String enCoding; 

    /** *//**
     *   DbConnection object instantiation
     * @param host   Database Host  (IP)
     * @param port   Database port
     * @param dName   Database Name
     * @param uName   Username
     * @param password   Password
    public FilterData(String host, String port, String dName, String uName, String password)
        driverName = "com.sybase.jdbc3.jdbc.SybDriver";
        dbHost = host;
        dbPort = port;
        dbName = dName;
        dbUserName = uName;
        dbPassword = password;
        enCoding = "?Charset";
    }//end DbConnection()

    /** *//**
     *   Connect to the database
     * @return  Connection successful return true, the connection fails to return  false
    public boolean dbConnection()
        StringBuilder urlTem = new StringBuilder();
        String url = urlTem.toString();
            dbConnection = DriverManager.getConnection(url, dbUserName, dbPassword);
            return true;
        }catch(Exception e){
            System.err.println("  Database connection failed  !");
            System.out.println("url = " + url);
            e.printStackTrace(); //  Detailed error message received
            return false;
    }// end dbConnection()

    /** *//**
     *   Select the implementation of special operations  ,  Note  :  SelectSql the field and in the  fields  In number. Name to be consistent
     * @param selectSql   For the implementation of the select statement
     * @param fields   To select the field
     * @return   Map of containing  ArrayList,  A record form a  Map
    public ArrayList dbSelect(String selectSql, ArrayList fields)
        ArrayList<Map> selectResult = new ArrayList<Map>();
        Map<String, String> recordInfo;
            selectPro = dbConnection.createStatement();//  Statement object definitions
            dbResultSet = selectPro.executeQuery(selectSql);
                recordInfo = new HashMap<String, String>();
                for(int i = 0; i<fields.size(); ++i)
                    recordInfo.put((String)fields.get(i), dbResultSet.getString((String)fields.get(i)));
            dbResultSet.close(); //  Disconnect the result set
            selectPro.close(); //  Disconnect the Statement object
        }catch(Exception e){
            System.out.println("  Select operation failed  ");
            System.out.println("Sql = " + selectSql);
        return selectResult;
    }//end dbSelect()

    /** *//**
     *   Performed on the database update, delete or  insert  Operation
     * @param sql   SQL statement to perform the operation
     * @return   The implementation of successful return true, failure to return  false
    public boolean dbUpdate(String sql)
            updatePro = dbConnection.createStatement(); //  Statement object definitions
            updatePro.close();// -------------  Close the Statement object
            return true;
        }catch(Exception err){
            System.out.println("  Database operation failed  !");
            System.out.println("Sql = " + sql);
            return false;
    }//end dbUpdate()

    /** *//**
     *   Close the database connection
     * @return   Successful return true, failure to return  false
    public boolean closeDatabase()
            if(dbConnection != null)
            return true;
        }catch (Exception ex){
            return false;
    }//end closeDatabase()

    public String filterData(String area){
        String areas[] = area.split("-");
        String resultData = "";
        if(areas.length == 3){
                resultData = areas[0]+"-"+areas[2];
                resultData = area;
        return resultData;

    public static void main(String[] args)
        String dbHost = "";
        String dbPort = "5000";
        String dbName = "ssjg";
        String dbUserName = "sa";
        String dbPassword = "123456";
        String tableName = "BASEDATA_50000011";
        String tableid = "BASEDATAID";
        String areaname = "JCDQNAME";
        FilterData conn = new FilterData(dbHost, dbPort, dbName, dbUserName, dbPassword);
        boolean bool = conn.dbConnection();
        String selectSql = "select "+tableid+","+areaname+" from "+tableName+" order by JCDID";
        ArrayList<String> fieldsList = new ArrayList<String>();
        ArrayList<Map> userInfoList = conn.dbSelect(selectSql, fieldsList);
        int infoSize = userInfoList.size();
        String userName;
        String ad;
        if(infoSize == 0)
            System.out.println("  No data selected eligible  ");
            for(int i = 0; i < infoSize; ++i){
                userName = (String)userInfoList.get(i).get(areaname);
                ad = (String)(((Map)userInfoList.get(i)).get(tableid));
                String areaData = conn.filterData(userName);
                String updateSql = "update "+tableName+" set "+areaname+" = '" + areaData + "' where "+tableid+" ="+new Integer(ad)+"";
                System.out.println(areaname + " = " + areaData+";"+tableid+" = " + ad);
            System.out.println("  Total number of records  :"+infoSize);
    }//end main()

分类:Java 时间:2010-07-21 人气:227
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