creditdao.java

销售管理系统 随着我国国民经济的持续发展

package com.dao;

import com.tool.JDBConnection;
import java.util.*;
import com.domain.CreditVO;
import java.sql.*;

public class CreditDao {
  private JDBConnection connection = null;
  public CreditDao() {
    connection = new JDBConnection();
    this.connection.creatConnection(); //利用构造方法调用类中的对象对数据库创建连接
  }

  public List creditSelect() {
    List list = new ArrayList();
    CreditVO credit = null;
    String sql = "select * from tb_credit order by id";
    ResultSet rs = connection.executeQuery(sql);
    try {
      while (rs.next()) {
        credit = new CreditVO();
        credit.setId(Integer.valueOf(rs.getString(1)));
        credit.setCredit_number(rs.getString(2));
        credit.setCredit_name(rs.getString(3));
        credit.setCredit_remark(rs.getString(4));
        list.add(credit);
      }
    }
    catch (SQLException ex) {
    }
    connection.closeConnection();
    return list;
  }

  public CreditVO creditSelectOne(String number) {
    CreditVO credit = null;
    String sql = "select * from tb_credit where credit_number='" + number + "'";
    ResultSet rs = connection.executeQuery(sql);
    try {
      while (rs.next()) {
        credit = new CreditVO();
        credit.setId(Integer.valueOf(rs.getString(1)));
        credit.setCredit_number(rs.getString(2));
        credit.setCredit_name(rs.getString(3));
        credit.setCredit_remark(rs.getString(4));
      }
    }
    catch (SQLException ex) {
    }
    connection.closeConnection();
    return credit;
  }

//以名称为条件查询
  public CreditVO creditSelectName(String name) {
    CreditVO credit = null;
    String sql = "select * from tb_credit where credit_name='" + name + "'";
    ResultSet rs = connection.executeQuery(sql);
    try {
      while (rs.next()) {
        credit = new CreditVO();
        credit.setId(Integer.valueOf(rs.getString(1)));
        credit.setCredit_number(rs.getString(2));
        credit.setCredit_name(rs.getString(3));
        credit.setCredit_remark(rs.getString(4));
      }
    }
    catch (SQLException ex) {
    }
    connection.closeConnection();
    return credit;
  }

//添加操作
  public void creditInsert(CreditVO vo) {
    String sql = "insert into tb_credit values ('" + vo.getCredit_number() + "','" +
        vo.getCredit_name() + "','" + vo.getCredit_remark() + "')";
    connection.executeUpdate(sql);
    connection.closeConnection();
  }

  //删除操作
  public void creditDelete(Integer id) {
    String sql = "delete from tb_credit where id='" + id + "'";
    connection.executeUpdate(sql);
    connection.closeConnection();
  }

  //修改编号的操作
  public void creditUpdateNumber(Integer id, String number) {
    String unNumber = "Credit-" + String.valueOf(id);
    String sql = "update tb_credit set credit_number='" + unNumber +
        "'  where credit_number='" + number + "'";

    connection.executeUpdate(sql);
    connection.closeConnection();
  }

  //修改操作
  public void creditUpdate(CreditVO vo) {
    String sql = "update tb_credit set credit_name='" + vo.getCredit_name() +
        "',credit_remark='" + vo.getCredit_remark() + "' where credit_number='" +
        vo.getCredit_number() + "'";
    connection.executeUpdate(sql);
    connection.closeConnection();
  }
}