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我按照教程通過Android應用程序中的PHP腳本連接到MySQL數據庫。我的問題是(來自LogCat):「Uncaught TypeError:無法調用方法'選擇'未定義爲null:1」。前段時間我有成功,所以也許我無意中修改了一些導致這種情況的東西?在我的數據庫中,有4列,在這方面一切都很好。這是我的PHP代碼:從Android連接到MySQL數據庫
<?php
$host="xxxxx"; // Host name
$username="xxxxx"; // Mysql username
$password="xxxxx"; // Mysql password
$db_name="xxxxx"; // Database name
$tbl_name="xxxxx"; // Table name
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
$q=mysql_query("SELECT * FROM $tbl_name WHERE pass>'".$_REQUEST['year']."'");
while($e=mysql_fetch_assoc($q))
$output[]=$e;
print(json_encode($output));
mysql_close();
?>
...並在Android:
String result = "";
//the year data to send
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("year","Pass1"));
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://MyWebsite/queryfromandroid.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
//parse json data
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","id: "+json_data.getString("password")
);
}
}
catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
感謝。
嘗試調用你r瀏覽器的php腳本 - 這會告訴你腳本中的任何錯誤。首先解決這些問題,然後繼續解決事情的android方面。 – 2013-02-22 15:13:22
現在很多SO用戶剛剛看到您的數據庫信息,很好!我會建議改變。 – 2013-02-22 15:14:05
對不起,但我無法訪問錯誤日誌中的我的免費託管計劃,&LogCat,只有這個錯誤,沒有別的... – Nikita 2013-02-22 15:15:02