newtype.java~1~

对项目

package zhaobiao.db;

import java.util.*;
import java.sql.*;
import zhaobiao.db.*;
import zhaobiao.data.*;

/**
 * <p>Title: 招标管理信息系统</p>
 * <p>Description: 招标管理信息系统的前台设计</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: 北京王者无敌</p>
 * @author csk
 * @version 1.0
 */

public class NewType {

  public NewType() {
  }

  public void addType(Type type)
  {
    db=DBConnectionManager.getInstance();
    con=db.getConnection("idb");
    long maxid=0;
    try {
      PreparedStatement ps1 = con.prepareStatement("select max(type_id) as id from type");
      rs =ps1.executeQuery();
      if(rs.next() ){
        maxid = rs.getLong("id")+1 ;
      }
      else
        maxid=1;
      if(ps1!=null)
        ps1.close();
    }
    catch (SQLException ex) {
      ex.printStackTrace() ;
    }

    String sql="insert into type(type_id,type_name,Type_content) values(?,?,?)";
    try {
      ps=con.prepareStatement(sql);
      ps.setLong(1,maxid);
      ps.setString(2,type.getType_name());
      ps.setString(3,type.getType_content() );
      ps.executeUpdate();
    }
    catch (SQLException ex) {
      freeCon();
      ex.printStackTrace();
    }
    freeCon();

  }

  public void updateType(Type type)
  {
    db=DBConnectionManager.getInstance();
    con=db.getConnection("idb");
    String sql="update type set type_name=?,set type_content=? where type_id=?";
    try {
      ps=con.prepareStatement(sql);
      ps.setString(1,type.getType_name());
      ps.setString(2,type.getType_content());
      ps.setLong(3,type.getType_id());
      ps.executeUpdate();
    }
    catch (SQLException ex) {
      freeCon();
      ex.printStackTrace();
    }
    freeCon();
  }

  public void delType(long typeid)
  {
    db=DBConnectionManager.getInstance();
    con=db.getConnection("idb");
    String sql="delete from type where type_id=?";
    try {
      ps=con.prepareStatement(sql);
      ps.setLong(1,typeid);
      ps.executeUpdate();
      NewProject newpj=new NewProject();             //调用NewProject中的删除方法
      newpj.delProjectTypeid(typeid);
      newpj.freeCon();
                                                  //删除所有的该类产品调用NewProduct中方法
    }
    catch (SQLException ex) {
      freeCon();
      ex.printStackTrace();
    }
    freeCon();
  }


  public static void main(String[] args) {
    NewType newType1 = new NewType();
  }

  /**
     * 释放数据库资源<p>
     *PreparedStatement和ResultSep将关闭，Connection返回给连接池
     * @param      无
     * @repurn     无
     * @exception  SQLException
     *
     */
    public void freeCon(){
      try {
        if (rs!=null)
          rs.close() ;
        if (ps!=null)
          ps.close() ;
      }
      catch (SQLException ex) {
      }
      if (db!=null)
        db.freeConnection("idb",con) ;
    }

  private PreparedStatement ps=null;
  private DBConnectionManager db;
 private Connection con=null;
  private ResultSet rs=null;
}