我正在开发一个 Android 注册和登录应用程序。登录代码工作正常，但在注册时我总是收到“Exists”作为来自 php 的响应。
如果我删除 sql 插入查询(即/* MySQL 插入查询 */)，它就会起作用
我的register.php代码:
<?php
$dbhost = "localhost";
$dbname = "test";
$dbuser = "root";
$dbpass = "";
$conn = mysql_connect($dbhost,$dbuser,$dbpass)
or
trigger_error(mysql_error(),E_USER_ERROR);
mysql_select_db($dbname, $conn);
$username = mysqli_real_escape_string($conn, $_POST['username']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$password = mysqli_real_escape_string($conn, $_POST['password']);
$query_search = "SELECT count(*) FROM aw_poc WHERE email = '$email'";
$query_exec1 = mysql_fetch_array($query_search);
$rows = $query_exec1[0];
/*$query_search = "SELECT * FROM aw_poc WHERE email = '$email'";
$query_exec1 = mysql_query($query_search) or die(mysql_error());
$rows = mysql_num_rows($query_exec1);*/
if ( $rows == 0) {
$query_insert = "INSERT INTO aw_poc (username, email, password) VALUES ('$username', '$email', '$password')";
/* MySQL insert query */
$query_exec2 = mysql_query($query_insert) or die(mysql_error());
if ($query_exec2) {
echo "Success";
}
} else {
echo "Exists";
}
mysql_close($conn);
?>
无论电子邮件是否存在，上述代码都会插入相同的值 3 次。我已附上数据库表的快照
这是我的 Registration_activity 的 android java 代码:
public class Registration_activity extends Activity{
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
Button ok_btn;
EditText username,password,re_password,email;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
ok_btn = (Button)findViewById(R.id.signup_btn);
username = (EditText)findViewById(R.id.rusername_txtbox);
password = (EditText)findViewById(R.id.rpassword_txtbox);
re_password = (EditText)findViewById(R.id.re_password_txtbox);
email = (EditText)findViewById(R.id.email_txtbox);
ok_btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(!username.getText().toString().trim().equals("") && !password.getText().toString().trim().equals("") && !re_password.getText().toString().trim().equals("") && !email.getText().toString().trim().equals("")){
if(password.getText().toString().trim().equals(re_password.getText().toString().trim())){
if(android.util.Patterns.EMAIL_ADDRESS.matcher(email.getText().toString().trim()).matches()){
dialog = ProgressDialog.show(Registration_activity.this, "","Creating user...", true);
new Thread(new Runnable() {
public void run() {
login();
}
private void login() {
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://localhost/register.php");
nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username",username.getText().toString().trim()));
nameValuePairs.add(new BasicNameValuePair("password",password.getText().toString().trim()));
nameValuePairs.add(new BasicNameValuePair("email",email.getText().toString().trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response=httpclient.execute(httppost);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
final String response = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + httpclient.execute(httppost, responseHandler));
runOnUiThread(new Runnable() {
public void run() {
dialog.dismiss();
}
});
if(httpclient.execute(httppost, responseHandler).contains("Success")){
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(Registration_activity.this,"Registration Success", Toast.LENGTH_SHORT).show();
}
});
Intent intent = new Intent(Registration_activity.this,Login_activity.class);
startActivity(intent);
}
else if(httpclient.execute(httppost, responseHandler).contains("Exists")){
showAlert("Email-id already used");
}
else if (httpclient.execute(httppost, responseHandler).contains("Error")){
showAlert("Error!!!");
}
}catch(Exception e){
dialog.dismiss();
System.out.println("Exception : " + e.getMessage());
}
}
private void showAlert(final String s) {
Registration_activity.this.runOnUiThread(new Runnable() {
public void run() {
AlertDialog.Builder builder = new AlertDialog.Builder(Registration_activity.this);
builder.setTitle("Alert");
builder.setMessage(s)
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = builder.create();
alert.show();
}
});
}
}).start();
}
else{
Toast.makeText(getApplicationContext(), "Email address format error!!!", Toast.LENGTH_LONG).show();
email.setText("");
email.requestFocus();
}
}
else{
Toast.makeText(getApplicationContext(), "Password does not match!!!", Toast.LENGTH_LONG).show();
password.setText("");
re_password.setText("");
password.requestFocus();
}
}
else{
Toast.makeText(getApplicationContext(), "Some details Missing!!!", Toast.LENGTH_LONG).show();
username.requestFocus();
}
}
});
}
}
最佳答案
用这个替换计数逻辑。
$query_search = "SELECT count(*) FROM aw_poc WHERE email = '$email'";
$query_exec1 = mysql_fetch_array($query_search);
$rows = $query_exec1[0];
只是一条建议，不要使用 mysql 命令，其中大多数命令已被弃用。请改用 PDO。
http://php.net/manual/en/book.pdo.php
更新:
您每次都会收到 3 个条目，因为您正在调用 .execute()方法四次:
response=httpclient.execute(httppost);
final String response = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + httpclient.execute(httppost, responseHandler));
if(httpclient.execute(httppost, responseHandler).contains("Success")){}
删除:
response=httpclient.execute(httppost);
替换:
System.out.println("Response : " + httpclient.execute(httppost, responseHandler));
if(httpclient.execute(httppost, responseHandler).contains("Success")){}
与:
System.out.println("Response : " + response));
if(response.contains("Success")){}
关于php - 从 php 和 android 向 mysql 插入值时无法获得正确的响应，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29295700/