我在使用Android应用程序连接数据库时遇到问题。我正在尝试实施this教程。一切似乎都很好但我既没有成功也没有错误。
有一个按钮监听器,在点击时会发送一个PHP文件的帖子并获得结果。以下是代码: -
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("username", un.getText().toString()));
postParameters.add(new BasicNameValuePair("password", pw.getText().toString()));
//String valid = "1";
String response = null;
try {
response = CustomHttpClient.executeHttpPost("http://10.0.2.2/check.php", postParameters);
String res=response.toString();
Log.d("res:", res);
// res = res.trim();
res= res.replaceAll("\\s+","");
//error.setText(res);
if(res.equals("1"))
error.setText("Correct Username or Password");
else
error.setText("Sorry!! Incorrect Username or Password");
} catch (Exception e) {
un.setText(e.toString());
}
}
});
这是http post方法: -
public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpPost request = new HttpPost(url);
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
request.setEntity(formEntity);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
Log.d("postMethodReturn", result);
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
PHP代码如下: -
<?php
$un=$_POST['username'];
$pw=$_POST['password'];
//connect to the db
$user = "xyz";
$pswd = "xyz";
$db = "mydb";
$host = "localhost";
$conn = mysql_connect($host, $user, $pswd);
mysql_select_db($db);
//run the query to search for the username and password the match
$query = "SELECT * FROM mytable WHERE user = '$un' AND pass = '$pw'";
$result = mysql_query($query) or die("Unable to verify user because : " . mysql_error());
//this is where the actual verification happens
if(mysql_num_rows($result) --> 0)
echo 1; // for correct login response
else
echo 0; // for incorrect login response
?>
程序中是否有任何错误?我尝试在活动代码中记录res(http响应)的中间值,并导致执行post方法,但没有记录任何内容。尝试将“localhost”更改为“127.0.0.1”,并将其更改为公共可用的webhost,具有所有数据库环境,但没有成功。所有这些都在模拟器和公共主机上,也尝试使用真实设备。从浏览器检查时,服务器似乎正在运行。数据库存在值。所有服务都在运行(apache,mysql)。
主要问题是没有错误!有什么建议是什么问题? 找不到有同样问题的人。
答案 0 :(得分:1)
PHP代码中的问题是-->
。将其更改为==
或>
,一切正常!