customermanager.java

这是中国移动的一个管理系统

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package com.mobile.mode;

import com.mobile.util.DBUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 *
 * @author st
 */
public class CustomerManager {

    private CustomerManager() {
    }
    private static CustomerManager manager = null;

    public static CustomerManager getInstance() {
        if (manager == null) {
            manager = new CustomerManager();
        }
        return manager;
    }

    //是否在,, 
    public boolean isExist(String stype, String snumber) {


        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;

        String sql = "select count(*) from tcustomer where id_type = ? and id_number= ? ";

        try {
            conn = DBUtil.getConnection();
            stmt = conn.prepareStatement(sql);
            stmt.setString(1, stype);
            stmt.setString(2, snumber);

            rs = stmt.executeQuery();

            rs.next();
            int is = rs.getInt(1);
            if (is == 0) {
                return false;
            } else {
                return true;
            }


        } catch (SQLException ex) {
            ex.printStackTrace();
            return false;
        } finally {
            DBUtil.close(rs, stmt, conn);
        }

    }

    public Customer getByTypeNumber(String stype, String snumber) {

        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;

        String sql = "select * from tcustomer where id_type = ? and id_number= ? ";
        Customer c = null;
        try {
            conn = DBUtil.getConnection();
            stmt = conn.prepareStatement(sql);
            stmt.setString(1, stype);
            stmt.setString(2, snumber);

            rs = stmt.executeQuery();

            if (rs.next()) {
                c = new Customer();
                c.setId(rs.getInt("Customer_ID"));
                c.setType(rs.getString("ID_Type"));
                c.setIdNumber(rs.getString("ID_Number"));
                c.setName(rs.getString("Customer_Name"));
                c.setBdate(rs.getDate("Customer_Birthday"));
                c.setSex(rs.getString("Customer_Sex"));
                c.setAddress(rs.getString("Customer_Address"));
            }


        } catch (SQLException ex) {
            ex.printStackTrace();
        } finally {
            DBUtil.close(rs, stmt, conn);
        }
        return c;
    }
    public static void main(String[] args){
      System.out.println(CustomerManager.getInstance().getByTypeNumber("D", "100859").getId());
    }
}