How to retrieve data from sql server db in android

Question

this is the first time I am developing an android application. I want to bind some data with grid view or list view based employee id provided on the text box. How can I do that. Please help me to find a proper solution. Thank you.

ConnectionClass.java:

 import android.annotation.SuppressLint;
 import android.os.StrictMode;
 import android.util.Log;
 import java.sql.SQLException;
 import java.sql.Connection;
 import java.sql.DriverManager;

/**
 * Created by H-PC on 16-Oct-15.
 */
public class ConnectionClass {

    String ip = "******";
    String classs = "net.sourceforge.jtds.jdbc.Driver";
    String db = "IDB";
    String un = "sa";
    String password = "admin123";

    @SuppressLint("NewApi")
    public Connection CONN() {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);
        Connection conn = null;
        String ConnURL = null;
        try {

            Class.forName(classs);
            ConnURL = "jdbc:jtds:sqlserver://" + ip + ";"
                    + "databaseName=" + db + ";user=" + un + ";password="
                    + password + ";";
            conn = DriverManager.getConnection(ConnURL);
        } catch (SQLException se) {
            Log.e("ERRO", se.getMessage());
        } catch (ClassNotFoundException e) {
            Log.e("ERRO", e.getMessage());
        } catch (Exception e) {
            Log.e("ERRO", e.getMessage());
        }
        return conn;
    }
}

-------------------------------------------------------------------------------

MainActivity.java:

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View.OnClickListener;
import java.sql.Connection;

public class MainActivity extends AppCompatActivity {

    Button button1;
    TextView txtView1;
    EditText editText1;
    ConnectionClass connectionClass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        connectionClass = new ConnectionClass();
        button1=(Button)findViewById(R.id.btnSearch);
        txtView1=(TextView)findViewById(R.id.searchLbl);
        editText1=(EditText)findViewById(R.id.txtSearch);

        button1.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v) {

                String newValue = editText1.getText().toString().trim();

                if (newValue.toString().trim().equals("")) {
                    txtView1.setText("Please Enter ID");
                }
                else
                {
                    Connection con = connectionClass.CONN();

                if(con==null)
                {
                    String msg="Error in SQL Connection";
                }
                else
                {
                    String query= "Select * From Employees Where EmpId='"+newValue+"'";
                }
                }
            }


        });
        }
    }

---------------------------------------------------------------------------

Text

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.example.laptop37.myapplication2.MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RelativeLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true">



            <EditText
                android:layout_width="285dp"
                android:layout_height="42dp"
                android:id="@+id/txtSearch"
                android:layout_weight="1"
                android:textColor="@color/material_deep_teal_500"
                android:hint="enter id"
                android:layout_gravity="center_vertical"
                android:layout_below="@+id/textHeading"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_marginTop="30px"
                android:background="#b1e1b1"
                android:layout_marginLeft="10px"
                />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:text="Employee Data"
                android:id="@+id/textHeading"
                android:layout_weight="1"
                android:layout_alignParentTop="true"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_marginTop="30px"
                android:layout_alignParentRight="true"
                android:layout_alignParentEnd="true"
                android:textAlignment="center"
                android:textColor="#2eb114"
                android:textSize="70px"
                />

            <Button
                android:layout_width="85dp"
                android:layout_height="42dp"
                android:text="Search"
                android:id="@+id/btnSearch"
                android:layout_weight="0.43"
                android:background="@color/background_material_dark"
                android:textColor="#ffffff"
                android:layout_gravity="center_vertical"
                android:layout_alignBottom="@+id/txtSearch"
                android:layout_toRightOf="@+id/txtSearch"
                android:layout_toEndOf="@+id/txtSearch"
                android:layout_marginLeft="10px"
                android:layout_marginStart="10px"
                android:layout_marginRight="10px"
                />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/searchLbl"
                android:layout_below="@+id/txtSearch"
                android:layout_alignLeft="@+id/txtSearch"
                android:layout_alignStart="@+id/txtSearch"
                android:layout_marginTop="64dp" />

            <GridView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/gridViewEmp"
                android:layout_alignRight="@+id/txtSearch"
                android:layout_alignEnd="@+id/txtSearch"
                android:layout_below="@+id/txtSearch" />


        </RelativeLayout>
    </RelativeLayout>

</android.support.design.widget.CoordinatorLayout>
-------------------------------------------------------------------------------

Table(Employees):

EmpId EmpName Designation Gender Age Mob Address
----- ------- ----------- ------ --- --- -------
1      asd    ttt           M     30     fghfhfh
2      dfg    yyy           F     26     fhgfhfhf
3      dfhh   ppp           M     47     fghhfghf

--------------------------------------------------------------------------------

Design:

Answer 1

将数据库导出到App中的Assets文件夹，然后通过它获取详细信息。

Answer 2

You cant access sql server directly...

First you need to make a web service because your database sits on your host not on your phone memory card, web service process a request from app and responds accordingly.That is, you pass some SQL query parameters from app to the web service and let your web service handle the request. This web service can be of any type JAVA, PHP, etc. You just need to use standard HTTP methods. click

Answer 3

Here is an example of how you can display data gathered from a database in to a listview.

    final ListView listView = getListView();
    final String[][] _customerData = MySQL.Get("SELECT Id,Name,Surname FROM customers");
    final List<Integer> _currentCustomerIDs = new ArrayList<>();
    final List<String> _nameList = new ArrayList<>();

    for (String[] customer : _customerData)
    {
        _currentCustomerIDs.add(Integer.valueOf(customer[0]));
        _nameList.add(customer[2] + " " + customer[1]);
    }
    listView.invalidateViews();
    listView.setTextFilterEnabled(true);
    listView.setAdapter(getListAdapter());
    setListAdapter(new ArrayAdapter<>(this, R.layout.customer_list, _nameList.toArray()));

You need to make a select query, then declare a list of integers, iterate through that list, add it to your arraylist, and finally add it to your listview.

Above is an example adding integers as well as strings to your list with data gathered from a jdbc database.

Good luck, Hope it helps!

Answer 4

in that case you

button1.setOnClickListener(new View.OnClickListener(){

    @Override
    public void onClick(View v) {

            String newValue = editText1.getText().toString().trim();

            if (newValue.toString().trim().equals("")) {
                txtView1.setText("Please Enter ID");
            }
            else
            {
                Connection con = connectionClass.CONN();

                if(con==null)
                {
                    String msg="Error in SQL Connection";
                }
                else
                {

                    try {

                        st = con.createStatement();

                        // set the result in result set then fetch it
                        rs = st.executeQuery("Select * From Employees Where EmpId='"+newValue+"'");

                        if (rs.next()){
                            Toast.makeText(getApplicationContext()," EmpId :. " + rs.getString("EmpId")+" EmpName :. "+rs.getString("EmpName")+ " Designation :. " + rs.getString("Designation")+" Gender :. "+rs.getString("Gender")+" etc..",LENGTH_LONG).show();

                        }else{
                            // you have no record

                        }


                    }
                }
            }


    });
});