Android+PHP简单实现

功能：登陆、注册、查看留言、发布留言

一、数据库设计：

user表：

create table user(
id int primary key auto_increment,
username varchar(16) unique not null,
password varchar(32) not null
);

massage表：
create table massage(
id int primary key auto_increment,
title varchar(32) not null,
content varchar(500) not null,
time datatime,
);

二、PHP代码

链接数据库：

<?php

error_reporting(0); //屏蔽警告
mysql_connect("主机名", "用户", "密码") or die(mysql_errno);//链接数据库
mysql_select_db("app_renlaibang");//选择数据库
mysql_query("set names utf8"); //设置编码

?>

注册：
<?php

include("conn.php");//引入数据库连接
$response = array();//创建一个数组

if (isset($_POST['username']) && isset($_POST['password'])) { //判断从客户端传来的用户名密码是否为空
//用户名和密码不为空
$name = $_POST['username'];
$password = $_POST['password'];
$result = mysql_query("INSERT INTO rlb_users(username, password) VALUES('$name', '$password')"); //执行SQL语句，$result接受结果集
if ($result) { //判断结果集是否为真

$response["state"] = "success"; //为真，赋值状态：$response['state'] 为success

echo json_encode($response); //打包为json数据返回给客户端
} else {

$response["state"] = "fail"; //<span style="font-family: Arial, Helvetica, sans-serif;">为假，赋值状态：$response[’state'] 为fail</span>

echo json_encode($response); //打包为json数据返回给客户端
}
} else { //用户名密码为空

$response["state"] = fail;
$response["error"] = "oooo";

echo json_encode($response);
}
?>

登陆：
<?php

include("conn.php");
$response = array();

if (isset($_POST['username']) && isset($_POST['password'])) {

$name = $_POST['username'];
$password = $_POST['password'];
$result = mysql_query("select username password from rlb_users where username='$name' && password='$password'");
if ($result) {

$response["state"] = "success";

echo json_encode($response);
} else {

$response["state"] = "fail";

echo json_encode($response);
}
} else {

$response["state"] = fail;

echo json_encode($response);
}
?>

发表：
<?php

include("conn.php");
$response = array();

if (isset($_POST['title']) && isset($_POST['content']) && isset($_POST['username'])) {

$title = $_POST['title'];
$content = $_POST['content'];
$name = $_POST['username'];
$result = mysql_query("INSERT INTO rlb_message(title, content, time, username) VALUES('$title', '$content', now(), '$name')");
if ($result) {

$response["state"] = "success";

echo json_encode($response);
} else {

$response["state"] = "fail";

echo json_encode($response);
}
} else {

$response["state"] = fail;
$response["error"] = "oooo";

echo json_encode($response);
}
?>

查看：

<?php

include("conn.php");
$response = array();

$result = mysql_query("select * from rlb_message");
while($row = mysql_fetch_assoc($result)){
$arr[] = $row;
}
$response = array("liuyans" => $arr);
echo json_encode($response);

?>