JDBC

package com.xuexi.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

/**
 * 获取数据库连接类
 * @author sker
 *
 */
public class DBHelper {
    
    /**
     * 数据库地址
     */
    private static final String URL = "jdbc:mysql://127.0.0.1/clock";
    
    /**
     * mysql 驱动
     */
    private static final String DRIVER = "com.mysql.jdbc.Driver";  
    
    /**
     * 用户名
     */
    private static final String USER = "root";  
    
    /**
     * 密码
     */
    private static final String PASSWORD = "123456";
    
  
    /**
     * 连接数据库
     * @param sql
     * @throws ClassNotFoundException 
     */
    public static Connection getConnection() throws ClassNotFoundException{
         
        Connection conn = null;
        try {
             Class.forName(DRIVER);//指定连接类型 
            conn = DriverManager.getConnection(URL, USER, PASSWORD);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }//获取连接  
         return conn;
    }
  
    /**
     * 关闭数据库连接
     */
    public static void close(Connection conn) {  
        try {  
            conn.close();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
    }  
}

package com.xuexi.dao;

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

import com.xuexi.db.DBHelper;

/**
 * dao层
 * @author sker
 *
 */
public class Dao {
    
    /**
     * 执行sql语句
     * @param sql
     * @throws ClassNotFoundException
     * @throws SQLException
     */
    public static void DoSql(String sql) throws ClassNotFoundException{
               //每次都要进行数据库的连接和关闭，除非建立连接池
        Connection conn = DBHelper.getConnection();
        Statement st;
        try {
            if(null != conn){
                st = conn.createStatement();
                st.execute(sql);
                st.close();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        DBHelper.close(conn);
        
    }
    
    /**
     * 查询sql语句
     * @param sql
     * @throws ClassNotFoundException
     * @throws SQLException
     */
    public static void query(String sql) throws ClassNotFoundException{
        Connection conn = DBHelper.getConnection();
        Statement st;
        try {
            if(null != conn){
　　　　　　　　　　//注意createStatement和prepareStatement的区别，一般使用prepareStatement，
　　　　　　　　　　//因为prepareStatement会做一次sql过滤,如：sql=“select * from user where id=1 or 1=1”
                st = conn.createStatement();
                ResultSet result = st.executeQuery(sql);
　　　　　　　　　　//查询的不止一条记录
                while(result.next()){
                    String loginName = result.getString("loginname");
                    String name = result.getString("name");
                    System.out.println(loginName + name);
                }
                st.close();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        DBHelper.close(conn);
        
    }
    
}
    

import static org.junit.Assert.*;

import org.junit.Test;

import com.xuexi.dao.Dao;

public class JDBCTest {

    @Test
    public void insertUserInfo() throws ClassNotFoundException {
        StringBuffer sb = new StringBuffer();
        sb.append("insert into user(loginname,PASSWORD,name,birthday,male,registertime,phone)")
        .append("values(‘18389351725‘,‘123456‘,‘小红‘,‘1996-2-23‘,‘1‘,‘2016-2-15‘,‘18389351725‘)");
        Dao.DoSql(sb.toString());
    }
}