Answers for "how to export sqlite database in android studio"

how to use sqlite android studio

package com.example.sqliteoperations;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    EditText Name, Pass , updateold, updatenew, delete;
    myDbAdapter helper;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Name= (EditText) findViewById(R.id.editName);
        Pass= (EditText) findViewById(R.id.editPass);
        updateold= (EditText) findViewById(R.id.editText3);
        updatenew= (EditText) findViewById(R.id.editText5);
        delete = (EditText) findViewById(R.id.editText6);

        helper = new myDbAdapter(this);
    }
    public void addUser(View view)
    {
        String t1 = Name.getText().toString();
        String t2 = Pass.getText().toString();
        if(t1.isEmpty() || t2.isEmpty())
        {
            Message.message(getApplicationContext(),"Enter Both Name and Password");
        }
        else
        {
            long id = helper.insertData(t1,t2);
            if(id<=0)
            {
                Message.message(getApplicationContext(),"Insertion Unsuccessful");
                Name.setText("");
                Pass.setText("");
            } else
            {
                Message.message(getApplicationContext(),"Insertion Successful");
                Name.setText("");
                Pass.setText("");
            }
        }
    }

    public void viewdata(View view)
    {
        String data = helper.getData();
        Message.message(this,data);
    }

    public void update( View view)
    {
        String u1 = updateold.getText().toString();
        String u2 = updatenew.getText().toString();
        if(u1.isEmpty() || u2.isEmpty())
        {
            Message.message(getApplicationContext(),"Enter Data");
        }
        else
        {
            int a= helper.updateName( u1, u2);
            if(a<=0)
            {
                Message.message(getApplicationContext(),"Unsuccessful");
                updateold.setText("");
                updatenew.setText("");
            } else {
                Message.message(getApplicationContext(),"Updated");
                updateold.setText("");
                updatenew.setText("");
            }
        }

    }
    public void delete( View view)
    {
        String uname = delete.getText().toString();
        if(uname.isEmpty())
        {
            Message.message(getApplicationContext(),"Enter Data");
        }
        else{
            int a= helper.delete(uname);
            if(a<=0)
            {
                Message.message(getApplicationContext(),"Unsuccessful");
                delete.setText("");
            }
            else
            {
                Message.message(this, "DELETED");
                delete.setText("");
            }
        }
    }
}

Export Sqlite Database as csv in android

public boolean exportDatabase() {
        DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT, Locale.getDefault());

        /**First of all we check if the external storage of the device is available for writing.
         * Remember that the external storage is not necessarily the sd card. Very often it is
         * the device storage.
         */
        String state = Environment.getExternalStorageState();
        if (!Environment.MEDIA_MOUNTED.equals(state)) {
            return false;
        }
        else {
            //We use the Download directory for saving our .csv file.
            File exportDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
            if (!exportDir.exists())
            {
                exportDir.mkdirs();
            }

            File file;
            PrintWriter printWriter = null;
            try
            {
                file = new File(exportDir, "MyCSVFile.csv");
                file.createNewFile();
                printWriter = new PrintWriter(new FileWriter(file));

                /**This is our database connector class that reads the data from the database.
                 * The code of this class is omitted for brevity.
                 */
                SQLiteDatabase db = this.getReadableDatabase(); //open the database for reading

                /**Let's read the first table of the database.
                 * getFirstTable() is a method in our DBCOurDatabaseConnector class which retrieves a Cursor
                 * containing all records of the table (all fields).
                 * The code of this class is omitted for brevity.
                 */
                Cursor curCSV = db.rawQuery("select * from contacts", null);
                //Write the name of the table and the name of the columns (comma separated values) in the .csv file.
                printWriter.println("FIRST TABLE OF THE DATABASE");
                printWriter.println("DATE,ITEM,AMOUNT,CURRENCY");
                while(curCSV.moveToNext())
                {
                    Long date = curCSV.getLong(curCSV.getColumnIndex("date"));
                    String title = curCSV.getString(curCSV.getColumnIndex("title"));
                    Float amount = curCSV.getFloat(curCSV.getColumnIndex("amount"));
                    String description = curCSV.getString(curCSV.getColumnIndex("description"));

                    /**Create the line to write in the .csv file.
                     * We need a String where values are comma separated.
                     * The field date (Long) is formatted in a readable text. The amount field
                     * is converted into String.
                     */
                    String record = df.format(new Date(date)) + "," + title + "," + amount + "," + description;
                    printWriter.println(record); //write the record in the .csv file
                }

                curCSV.close();
                db.close();
            }

            catch(Exception exc) {
                //if there are any exceptions, return false
                return false;
            }
            finally {
                if(printWriter != null) printWriter.close();
            }

            //If there are no errors, return true.
            return true;
        }
    }
}