使用PHP和MY SQL从数据库中搜索和检索数据（在android应用程序中）
Iam正在开发一个购物应用程序，其中项目显示在滚动视图中 单击其中一个项目时，必须获取所需字段，使用PHP和MY SQL在数据库中搜索它，并在应用程序中显示确切的产品 问题：使用PHP和MY SQL从数据库中搜索和检索数据（在android应用程序中）,php,android,mysql,Php,Android,Mysql,Iam正在开发一个购物应用程序，其中项目显示在滚动视图中 单击其中一个项目时，必须获取所需字段，使用PHP和MY SQL在数据库中搜索它，并在应用程序中显示确切的产品 问题： public class FullImage extends AppCompatActivity { ImageView fullimage; TextView name, des, price; private ProgressDialog progressDialog; String m
public class FullImage extends AppCompatActivity
{
ImageView fullimage;
TextView name, des, price;
private ProgressDialog progressDialog;
String model_grid, name_grid, price_grid, name_full = null, price_full = null, image_full;
ArrayList < RowItem > val_grid_full = new ArrayList < > ();
RowItem row1_grid = new RowItem();
URL url = null;
BufferedReader reader;
String text;
Context context_tab1;
String rate = "Rs ";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent in = getIntent();
// Selected image id
model_grid = in .getExtras().getString("model");
name_grid = in .getExtras().getString("name");
price_grid = in .getExtras().getString("price");
fullimage = (ImageView) findViewById(R.id.image_full);
name = (TextView) findViewById(R.id.text_name);
des = (TextView) findViewById(R.id.text_des);
price = (TextView) findViewById(R.id.price_full);
new DataFromServer().execute();
}
public class DataFromServer extends AsyncTask <String, Void, String>
{
@Override
protected void onPreExecute()
{
progressDialog = ProgressDialog.show(FullImage.this, "", "Please wait...");
}
@Override
protected String doInBackground(String...params)
{
try
{
url = new URL("http://xxx");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Host", "xxx.com");
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("m", model_grid)
.appendQueryParameter("n", name_grid)
.appendQueryParameter("p", price_grid);
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
text = sb.toString();
}
catch (Exception ex)
{
ex.toString();
}
finally
{
try
{
reader.close();
}
catch (Exception ex)
{
ex.toString();
}
}
return text;
}
@Override
protected void onPostExecute(String text)
{
//Close progress dialog
progressDialog.dismiss();
JSONArray ja;
try
{
ja = new JSONArray(text);
int len = ja.length();
for (int i = 0; i < len; i++)
{
JSONObject json_data = ja.getJSONObject(i);
name_full = json_data.getString("name");
image_full = json_data.getString("image");
price_full = json_data.getString("price");
RowItem rData1 = new RowItem();
rData1.setFull_grid_name(name_full);
rData1.setFull_grid_image(image_full);
rData1.setFull_grid_price(price_full);
val_grid_full.add(rData1);
name.setText(name_full);
price.setText(rate + (price_full));
String url = "xxx" + image_full;
Picasso.with(context_tab1).load(url).into(fullimage);
}
}
catch (Exception e)
{
e.toString();
}
// grid_shopping.setAdapter(new GridAdapter_tab1(Grid_tab1.this,val_grid_tab1));
}
}
}
<?php
include('con.php');
$model = $_POST['m'];
$price = $_POST['p'];
$name = $_POST['n'];
$q=mysql_query("SELECT oc_product_description.name,oc_product.image,oc_product.price,oc_product.model FROM oc_product INNER JOIN oc_product_description ON oc_product.product_id = oc_product_description.product_id WHERE model = '$model' and price = '$price' and name = '$name'");
while($e2=mysql_fetch_array($q)){
$output[]=$e2;
}
print(json_encode($output));
?>
public class FullImage extends AppCompatActivity
{
ImageView fullimage;
TextView name, des, price;
private ProgressDialog progressDialog;
String model_grid, name_grid, price_grid, name_full = null, price_full = null, image_full;
ArrayList < RowItem > val_grid_full = new ArrayList < > ();
RowItem row1_grid = new RowItem();
URL url = null;
BufferedReader reader;
String text;
Context context_tab1;
String rate = "Rs ";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent in = getIntent();
// Selected image id
model_grid = in .getExtras().getString("model");
name_grid = in .getExtras().getString("name");
price_grid = in .getExtras().getString("price");
fullimage = (ImageView) findViewById(R.id.image_full);
name = (TextView) findViewById(R.id.text_name);
des = (TextView) findViewById(R.id.text_des);
price = (TextView) findViewById(R.id.price_full);
new DataFromServer().execute();
}
public class DataFromServer extends AsyncTask <String, Void, String>
{
@Override
protected void onPreExecute()
{
progressDialog = ProgressDialog.show(FullImage.this, "", "Please wait...");
}
@Override
protected String doInBackground(String...params)
{
try
{
url = new URL("http://xxx");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Host", "xxx.com");
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("m", model_grid)
.appendQueryParameter("n", name_grid)
.appendQueryParameter("p", price_grid);
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
text = sb.toString();
}
catch (Exception ex)
{
ex.toString();
}
finally
{
try
{
reader.close();
}
catch (Exception ex)
{
ex.toString();
}
}
return text;
}
@Override
protected void onPostExecute(String text)
{
//Close progress dialog
progressDialog.dismiss();
JSONArray ja;
try
{
ja = new JSONArray(text);
int len = ja.length();
for (int i = 0; i < len; i++)
{
JSONObject json_data = ja.getJSONObject(i);
name_full = json_data.getString("name");
image_full = json_data.getString("image");
price_full = json_data.getString("price");
RowItem rData1 = new RowItem();
rData1.setFull_grid_name(name_full);
rData1.setFull_grid_image(image_full);
rData1.setFull_grid_price(price_full);
val_grid_full.add(rData1);
name.setText(name_full);
price.setText(rate + (price_full));
String url = "xxx" + image_full;
Picasso.with(context_tab1).load(url).into(fullimage);
}
}
catch (Exception e)
{
e.toString();
}
// grid_shopping.setAdapter(new GridAdapter_tab1(Grid_tab1.this,val_grid_tab1));
}
}
}
<?php
include('con.php');
$model = $_POST['m'];
$price = $_POST['p'];
$name = $_POST['n'];
$q=mysql_query("SELECT oc_product_description.name,oc_product.image,oc_product.price,oc_product.model FROM oc_product INNER JOIN oc_product_description ON oc_product.product_id = oc_product_description.product_id WHERE model = '$model' and price = '$price' and name = '$name'");
while($e2=mysql_fetch_array($q)){
$output[]=$e2;
}
print(json_encode($output));
?>
公共类FullImage扩展了AppCompative活动
{
图像查看完整图像；
TextView名称、des、价格；
私有进程对话；
字符串模型网格，名称网格，价格网格，名称完整=null，价格完整=null，图像完整；
ArrayListval_grid_full=新ArrayList<>（）；
RowItem row1_grid=新的RowItem（）；
URL=null；
缓冲读取器；
字符串文本；
上下文表1；
字符串速率=“Rs”；
@凌驾
创建时受保护的void（Bundle savedInstanceState）
{
super.onCreate（savedInstanceState）；
setContentView（R.layout.full_图像）；
//获取意图数据
Intent in=getIntent（）；
//所选图像id
model_grid=in.getExtras（）.getString（“model”）；
name_grid=in.getExtras（）.getString（“名称”）；
price_grid=in.getExtras（）.getString（“price”）；
fullimage=（ImageView）findviewbyd（R.id.image\u full）；
name=（TextView）findViewById（R.id.text\u name）；
des=（TextView）findViewById（R.id.text\u des）；
price=（TextView）findViewById（R.id.price\u full）；
新建DataFromServer（）.execute（）；
}
公共类DataFromServer扩展异步任务
{
@凌驾
受保护的void onPreExecute（）
{
progressDialog=progressDialog.show（FullImage.this，“，”请稍候…）；
}
@凌驾
受保护的字符串doInBackground（字符串…参数）
{
尝试
{
url=新url（“http://xxx");
HttpURLConnection conn=（HttpURLConnection）url.openConnection（）；
conn.setDoInput（真）；
连接设置输出（真）；
conn.SETUSECHACHES（假）；
conn.setRequestMethod（“POST”）；
conn.setRequestProperty（“内容类型”、“应用程序/x-www-form-urlencoded”）；
conn.setRequestProperty（“主机”、“xxx.com”）；
Uri.Builder=新的Uri.Builder（）
.appendQueryParameter（“m”，模型网格）
.appendQueryParameter（“n”，名称_网格）
.附录查询参数（“p”，价格网格）；
字符串查询=builder.build（）.getEncodedQuery（）；
OutputStream os=conn.getOutputStream（）；
BufferedWriter writer=新的BufferedWriter（新的OutputStreamWriter（os，“UTF-8”））；
writer.write（查询）；
writer.flush（）；
writer.close（）；
os.close（）；
连接（）；
reader=新的BufferedReader（新的InputStreamReader（conn.getInputStream（））；
StringBuilder sb=新的StringBuilder（）；
字符串行=null；
而（（line=reader.readLine（））！=null）
{
sb.追加（第+行“\n”）；
}
text=sb.toString（）；
}
捕获（例外情况除外）
{
例如toString（）；
}
最后
{
尝试
{
reader.close（）；
}
捕获（例外情况除外）
{
例如toString（）；
}
}
返回文本；
}
@凌驾
受保护的void onPostExecute（字符串文本）
{
//关闭进度对话框
progressDialog.disclose（）；
杰索纳雷；
尝试
{
ja=新的JSONArray（文本）；
int len=ja.length（）；
对于（int i=0；i public class FullImage extends AppCompatActivity
{
ImageView fullimage;
TextView name, des, price;
private ProgressDialog progressDialog;
String model_grid, name_grid, price_grid, name_full = null, price_full = null, image_full;
ArrayList < RowItem > val_grid_full = new ArrayList < > ();
RowItem row1_grid = new RowItem();
URL url = null;
BufferedReader reader;
String text;
Context context_tab1;
String rate = "Rs ";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent in = getIntent();
// Selected image id
model_grid = in .getExtras().getString("model");
name_grid = in .getExtras().getString("name");
price_grid = in .getExtras().getString("price");
fullimage = (ImageView) findViewById(R.id.image_full);
name = (TextView) findViewById(R.id.text_name);
des = (TextView) findViewById(R.id.text_des);
price = (TextView) findViewById(R.id.price_full);
new DataFromServer().execute();
}
public class DataFromServer extends AsyncTask <String, Void, String>
{
@Override
protected void onPreExecute()
{
progressDialog = ProgressDialog.show(FullImage.this, "", "Please wait...");
}
@Override
protected String doInBackground(String...params)
{
try
{
url = new URL("http://xxx");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Host", "xxx.com");
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("m", model_grid)
.appendQueryParameter("n", name_grid)
.appendQueryParameter("p", price_grid);
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
text = sb.toString();
}
catch (Exception ex)
{
ex.toString();
}
finally
{
try
{
reader.close();
}
catch (Exception ex)
{
ex.toString();
}
}
return text;
}
@Override
protected void onPostExecute(String text)
{
//Close progress dialog
progressDialog.dismiss();
JSONArray ja;
try
{
ja = new JSONArray(text);
int len = ja.length();
for (int i = 0; i < len; i++)
{
JSONObject json_data = ja.getJSONObject(i);
name_full = json_data.getString("name");
image_full = json_data.getString("image");
price_full = json_data.getString("price");
RowItem rData1 = new RowItem();
rData1.setFull_grid_name(name_full);
rData1.setFull_grid_image(image_full);
rData1.setFull_grid_price(price_full);
val_grid_full.add(rData1);
name.setText(name_full);
price.setText(rate + (price_full));
String url = "xxx" + image_full;
Picasso.with(context_tab1).load(url).into(fullimage);
}
}
catch (Exception e)
{
e.toString();
}
// grid_shopping.setAdapter(new GridAdapter_tab1(Grid_tab1.this,val_grid_tab1));
}
}
}
<?php
include('con.php');
$model = $_POST['m'];
$price = $_POST['p'];
$name = $_POST['n'];
$q=mysql_query("SELECT oc_product_description.name,oc_product.image,oc_product.price,oc_product.model FROM oc_product INNER JOIN oc_product_description ON oc_product.product_id = oc_product_description.product_id WHERE model = '$model' and price = '$price' and name = '$name'");
while($e2=mysql_fetch_array($q)){
$output[]=$e2;
}
print(json_encode($output));
?>
谢谢大家抽出时间
我自己找到了解决办法。实际上，我使用了一个字符串（Rs）来查看字符串上的价格，这就产生了问题
我将值连同附加的字符串一起传递给服务器。一旦我用空格替换字符串，它就可以正常工作了
从
in.putExtra("price",price_item);
到
试试这个演示，它可以帮助您更好地从服务器获取数据：首先停止使用mysql函数。其中大部分已经在PHP7.0中删除。我建议使用MySQL PDO类。有关PDO中的示例，请检查此链接