Java——MVC框架

本文禁止转载，仅用于个人学习！

MVC框架结构：

操作步骤：

1、下载一个JDBC驱动

2、将驱动复制到当前项目

3、挂载驱动：右键项目--->properties--->resource--->Java build path--->libraries--->add JAR resource

4、创建以下包：javaBean，jdbc,dao,service,control,view，test

5、在各个包下创建class，完成操作

DBC程序访问数据库的步骤：

         1、加载并注册驱动程序

         2、创建一个connection连接

         3、创建一个statment对象

         4、执行查询或更新

         5、结果处理

         6、关闭连接

自己写了一个封装工具类，以后方便使用jdbc

代码实现如下:

package com.oracle.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCutil {
    private static Connection conn=null;
    private PreparedStatement pst=null;
    private String driver="oracle.jdbc.driver.OracleDriver";
	private String url="jdbc:oracle:thin:@10.25.43.157:1521:orcl";
	private String userName="scott";
	private String pwd="tiger";	
    /*mySQL连接
    private String driver="com.mysql.jdbc.Driver";
	//private String url="jdbc:mysql://localhost:3306/test?useSSL=false";
	private String url="jdbc:mysql://localhost:3306/test2?
useUnicode=true&characterEncoding=UTF-8&useSSL=false";
	private String userName="root";
	private String pwd="root";*/

    public Connection getConnection(){
        try {
            Class.forName(driver);
            System.out.println("加载驱动成功");
            if(conn==null){
                conn = DriverManager.getConnection(url,userName,pwd);
            }
            System.out.println("创建Connection连接成功");
        } catch (ClassNotFoundException e) {
            System.out.println("加载驱动失败");
            e.printStackTrace();
        } catch (SQLException e) {
            System.out.println("创建Connection连接失败");
            e.printStackTrace();
        }
        return conn;
    }

    public int executeUpdate(String sql) throws SQLException {
        int count=0;
        try {
            pst=conn.prepareStatement(sql);
            count=pst.executeUpdate();
            System.out.println("执行更新操作成功,有"+count+"条记录更新");
        } catch (SQLException e) {
            System.out.println("执行更新操作失败");
            e.printStackTrace();
            throw new SQLException();
        }
        return count;
    }
    public int executeUpdate(String sql,Object[] obj)throws SQLException{
        int count=0;
        try {
            pst=conn.prepareStatement(sql);
            for(int i=0;i<obj.length;i++){
                pst.setObject(i+1, obj[i]);
            }
            count=pst.executeUpdate();
            System.out.println("执行更新操作成功,有"+count+"条记录更新");
        } catch (SQLException e) {
            System.out.println("执行更新操作失败");
            e.printStackTrace();
            throw new SQLException();
        }
        return count;
    }
    public ResultSet executeQuery(String sql)throws SQLException{
        ResultSet rs=null;
        try {
            pst=conn.prepareStatement(sql);
            rs=pst.executeQuery();
            System.out.println("执行查询操作成功");
        } catch (SQLException e) {
            System.out.println("执行查询操作失败");
            e.printStackTrace();
            throw new SQLException();
        }
        return rs;
    }
    public ResultSet executeQuery(String sql,Object[] obj)throws SQLException{
        ResultSet rs=null;
        try {
            pst=conn.prepareStatement(sql);
            for(int i=0;i<obj.length;i++){
                pst.setObject(i+1, obj[i]);
            }
            rs=pst.executeQuery();
            System.out.println("执行查询操作成功");
        } catch (SQLException e) {
            System.out.println("执行查询操作失败");
            e.printStackTrace();
            throw new SQLException();
        }
        return rs;
    }

    public void beginTranaction(){
        try {
            conn.setAutoCommit(false);
            System.out.println("开始事务");
        } catch (SQLException e) {
            System.out.println("开始事务出现异常");
            e.printStackTrace();
        }
    }
    public void commit(){
        try {
            conn.commit();
            System.out.println("事务提交成功");
        } catch (SQLException e) {
            System.out.println("事务提交异常");
            e.printStackTrace();
        }
    }
    public void rollback(){
        try {
            conn.rollback();;
            System.out.println("事务回滚成功");
        } catch (SQLException e) {
            System.out.println("事务回滚异常");
            e.printStackTrace();
        }
    }

    public void close(){
        try {
            if(pst!=null){
                pst.close();
                pst=null;
                System.out.println("关闭PreparedStatement对象");
            }
            if(conn!=null){
                conn.close();
                conn=null;
                System.out.println("关闭Connection对象");
            }
        } catch (SQLException e) {
            System.out.println("关闭PreparedStatement,Connection对象异常");
            e.printStackTrace();
        }

    }
    public static void main(String[] args) {
        JDBCutil db=new JDBCutil();
        db.getConnection();
        db.close();
        System.out.println("over");
    }
}