刚开始学小程序没多久，这么一个简单的过程整了一个礼拜，关键是没人指导啊啊啊啊啊……心累，翻阅了n个书籍，查看了m个网站，亲测可以正常连接。现在终于明白了学习效率：培训班＞看视频＞自学。好啦，不多说了，进入正题！
1、数据库插入数据。 Mysql 数据库我没有放在本地，是放在远程服务器的，其实最终就是IP地址的问题。首先数据库里插入四条语句，如下图所示，
2、 tomcat 部署php。过程步骤如下，
1） 首先下载php程序，是一个zip的压缩包。如下图所示，
2） 将下载的php压缩包解压到tomcat的安装路径下，并重命名为php,如下图所示，
3） 查看电脑中是否已安装php的方法：计算机-属性-高级设置中点击“环境变量”，添加PATH环境变量，可以添加Admin环境变量，也可以添加系统环境变量，看个人需求，将php解压路径添加到PATH中。之后打开cmd，输入php -v或 php –version，如下图所示，
4）将php路径下的php. ini -development 复制，将副本改名php.ini，之后用记事本打开php.ini。（可以看出;为其注释符）修改其中两项设置：
①去掉 ext ension_dir = “ext”前面的 “ ; ”， 并且将extension_dir = “ext”修改为绝对路径，
②cgi.force_redirect修改为0，并去掉前面的 “ ; ”， 即 cgi.force_redirect = 0
如下图，
5）打开tomcat的conf文件夹。
选择context.xml文件，在<Context >加上属性privileged=”true”，如下图所示，
6）仍在tomcat的conf文件夹中。
修改web.xml文件，在<web-app>中加入如下的< servlet >
插入代码如下：
<servlet>
<servlet-name>php</servlet-name>
<servlet-class>org.apache.catalina.servlets.CGIServlet</servlet-class>
<init-param>
<param-name>clientInputTimeout</param-name>
<param-value>200</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<init-param>
<param-name>executable</param-name>
<param-value>D:tomcatphpphp-cgi.exe</param-value>
</init-param>
<init-param>
<param-name>passShellEnvironment</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>cgiPathPrefix</param-name>
<param-value>WEB-INF/phpbin</param-value>
</init-param>
<load-on-startup>5</load-on-startup>
</servlet>
7） 在<web-app>中加入如下的<servlet-mapping>，表示php 脚本 路径。
代码如下：
<servlet-mapping>
<servlet-name>php</servlet-name>
<url-pattern>/phpbin/*</url-pattern>
</servlet-mapping>
8） 新建一个api.php文件，文件内容如下。
在webappsROOTWEB-INF下新建一个phpbin的文件夹，并将api.php放置其中，如下图，
$sql=”select * from persons”;
$res=$link->query($sql);
$data=$res->fetch_all();
echo json_encode($data);
?>
api.php脚本代码如下(新建txt文件，修改后缀名为php即可)：
<?php
$link = new mysqli(‘10.103.20.54′,’root’,’abcdefg’,’test’);
$link->set_charset(“utf8”);
if($link->connect_error){
die(“连接失败：”.$link->connect_error);
}
9）打开tomcat（在bin文件夹下，双击startup.bat,苹果系统双击startup.sh文件即可打开tomcat服务）。
打开浏览器，输入localhost:8080/phpbin/index.php,看到如下页面，表明配置php配置成功！
3、 微信小程序 端。
1）新建一个项目，在index.wxml里输入：
<view wx:for=”{{data}}”>
{{item}}
</view>
2）index.js里输入：
onLoad: function () {
let that = this;
wx. request ({
url: ‘#39; ,
method: ‘GET’ ,
header: {
‘Content-Type’ : ‘application/json’ ,
},
data: {
},
success: function (res) {
console.log(res)
that.setData({
data:res.data,
})
},
fail: function () {
console.log( “请求数据失败” );
},
complete: function () {
}
})
}
3）预览一下，成功！
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