JDBC的使用（msql）；

JDBC代表Java数据库连接(Java Database Connectivity)，它是用于Java编程语言和数据库之间的数据库无关连接的标准Java API，换句话说：JDBC是用于在Java语言编程中与数据库连接的API。
如下是简单整理的JDBC使用的栗子, 以及一个demo。

package com.vips.stone.demo;

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


public class jdbcDemo {

    java.sql.Connection conn =null;
    PreparedStatement stmt = null;
    private String url = "jdbc:mysql://10.199.145.228:3306/vip_mo";
    private String username = "vipshop";
    private String password = "dWwkv%+!1cQf$FNy";
    private String sql = "select * from t_mo_top_menu where id =?";

    /**
     *
     * @param param_value
     *       需要查询的id=param_value
     * @throws SQLException
     */
    public void JDBCTest(Object param_value) throws SQLException {
        try {
            //STEP 1: 注册JDBC驱动程序
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            System.out.println("找不到驱动程序类 ，加载驱动失败！");
            e.printStackTrace();
        }
        try {
            //STEP 2: 建立数据库连接
            conn = DriverManager.getConnection(url, username, password);
        }catch (SQLException e){
            System.out.println("数据库连接失败！");
            e.printStackTrace();
        }
        //STEP 3: 创建Statement
        stmt = conn.prepareStatement(sql);
        //stmt.setString(1,col);
        stmt.setObject(1,param_value);
        //STEP 4: 执行SQL语句
        ResultSet rs = stmt.executeQuery(sql);
        int col = rs.getMetaData().getColumnCount();
        while(rs.next()){
            for (int i = 1; i <= col; i++) {
                System.out.print(rs.getString(i) + "\t");
                if ((i == 2) && (rs.getString(i).length() < 8)) {
                    System.out.print("\t");
                }
            }
            System.out.println("");
        }
        //STEP 5: 关闭JDBC连接
        rs.close();
        stmt.close();
        conn.close();
    }
}