jsp以及JDBC总结复习

html:

form

action method

jsp:

request.getParameter

request.setCharacterEncoding

session.setArrtribute

jdbc:

update set

inset into values

Shipping数据库关系

用户和购物车一对多

购物车和购物选项是一对多

在多的关系中存入关系一的ID就行了

order.jsp

就是List里面放着商品

xiadan.jsp

新new一个订单，写入数据库，再写入odersaleitem

JDBC

package com.jingtian.db;

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

public class DB {

public static Connection getConn() {
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver");//定义连接URL
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/shopping2", "root", "124343");//与数据库建立链接
//			con = DriverManager.getConnection("jdbc:mysql://117.25.156.167:3306/sq_xiaozhi","sq_xiaozhi", "a83twx");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return con;
}

public static Statement getStatement(Connection con) {
Statement stm = null;
try {
stm = con.createStatement();
} catch (SQLException e) {
e.printStackTrace();
}
return stm;
}

public static ResultSet executeQuery(String str,Statement stm) {
ResultSet rs = null;
try {
rs = stm.executeQuery(str);
return rs;
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}

public static int executeUpdate(String str,Statement stm) {
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
int i = stm.executeUpdate(str);
return i;
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return 0;
}

public static void close(Connection conn) {
try {
if (conn != null) {
conn.close();
conn = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}

public static void close(Statement stmt) {
try {
if (stmt != null) {
stmt.close();
stmt = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}

public static void close(ResultSet rs) {
try {
if (rs != null) {
rs.close();
rs = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}

}