学习实例.文章管理.数据库操作类.DBUtil.java

package business;

import java.sql.*;

public class DBUtil {
        String Connstr = "";
        Connection Conn = null;
        Statement stmt = null;
        //初始化数据库连接；
        public DBUtil(){
                try{
                        init();
                }catch(Exception e){
                        System.out.print("DBUtil:" + e.getMessage());
                }
        }
        public void init() throws Exception {
                try{
                          Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance(); 
                          Connstr = "jdbc:jtds:sqlserver://localhost/Web";
                          Conn = DriverManager.getConnection(Connstr,"java_user","java_user");
                          Conn.setAutoCommit(true);
                          stmt = Conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
                }catch(Exception e){
                        System.out.print("DBUtil Init:" + e.getMessage());
                }
        }
        //查询返回结果集
        public ResultSet Execute(String sql) throws Exception{
                ResultSet rsC = null;
                try{
                        rsC = stmt.executeQuery(sql);
                }catch(Exception e){
                        System.out.println("DBUtil->Execute:" + e.getMessage());
                }
                return rsC;
        }
        //执行SQL语句返回影响行数
        public int Execute(String sql,int iR) throws Exception{
                iR = stmt.executeUpdate(sql);
                return iR;
        }
        //执行插入
        public int Insert(String sql) throws Exception{
                int intTemp = 0 ;
                intTemp = stmt.executeUpdate(sql);
                return intTemp;
        }
        //执行更新
        public int Update(String sql) throws Exception{
                int intTemp = 0 ;
                intTemp = stmt.executeUpdate(sql);
                return intTemp;
        }
        //销毁
        public void destroy() {
                try{
                        stmt.close();
                        Conn.close();
                }catch(Exception e){
                        System.out.print("DBUtil destroy:" + e.getMessage());
                }
        }
}