package util; 
/*  * date:   2004-11-17  * author:zhangyu6050;  * todo: 一个数据库封装类,作用是:  *                      获取数据库连接  *                      通过接受的SQL语句选择数据库并且返回结果  *       期间要作出以下判断:1 如果sql用来查询:、、、、  *           2 如果sql用来update:、、、、  *  * bugs:  * 改进:实现接口:sqlQuery;  *      主要继承一些比如ERROR,SUCCESS等的常量!  */ //package util; 
import java.util.List; import java.sql.*;   public class Mysql {    
    private String dirverName=Configs.dirverName;     private String URL=Configs.URL;     private String password=Configs.password;     private String userName=Configs.userName;     private Connection conn = null;     private Statement stmt = null;     private PreparedStatement prepstmt = null;       public Mysql(){           try {             getDataSource();             stmt=conn.createStatement();         } catch (SQLException e) {             System.out.print("conn.createStatement()发生错误!");             e.printStackTrace();         }     }    public Mysql(String query){      init(query);    } 
    protected void init(String aqurey){         try {             stmt=conn.createStatement();             prepareStatement(aqurey);         } catch (SQLException e) {             System.out.print("conn.createStatement()发生错误!");             e.printStackTrace();         } 
    }     //这个方法是准备创建一个MYsql对象后再调用,但我发现最好用单态从新设计!!!!改成静态方法              //设置?为变量的值--string类型     public void setString(int index, String value) throws SQLException {         prepstmt.setString(index, value);     }      public void prepareStatement(String sql) throws SQLException {         prepstmt = conn.prepareStatement(sql);       }     public void close() throws SQLException{         if(prepstmt!=null) prepstmt.close();         if(stmt!=null) prepstmt.close();     }     public ResultSet executeQuery() throws SQLException {         if (prepstmt != null) {           return prepstmt.executeQuery();         } else           return null;       }     public void getDataSource(){         try {             Class.forName(dirverName);             conn=DriverManager.getConnection(URL,userName,password); 
        } catch (Exception e) {             //连接发生错误!             System.out.print("连接发生错误!");             e.printStackTrace();         }     }      }
   
 
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