Prerequisite
If you not understand this lecture.Delete a row from android SQLite database .You should also read my previous lectures Android how can add data into SQLite and Android SQLite how can retrieve data and Android SQLite get a single row from table. After reading these lecture you will also able Delete a single row from database.
Introduction
In this lecture well we describe how can Delete a single row from Android SQLite Database.And also describe what is SQLite.why we can use it.After Reading this lecture you will understand how can Delete row from android SQLite Database . And i hope you will create Database of your application and also Delete row from database after reading this series.
What is Android SQLite database
SQLite is a embedded (RDBMS) Stand for Relation Database Management system.Most relation database such as ORA-CAL and SQL are example that are working independently and store the information .SQLite is referred to as embedded because it is provided in the form of a library that is linked into applications.The code for SQLite is in the public domain and is thus free for use for any purpose, commercial or private.There is no sever that are running in the background.All the Database function are perform internally.
Description of Deleting a Row
In this lecture we learn about how can delete a row from android SQLite database.So we use previous layout and add a button in this layout..When user enter a particular name for search and click on button the email and phone number related to name are appears.And if user want to delete this information click on delete button all the information will delete from database.So this is a work that will done this section.please read this lecture carefully all the detail is provides step by step.For more detail about android SQLite Database how can delete information please click on Delete a row from android SQLite database
Layout XML BASIC
XML Layout
First of you will open a XML file of layout and set Linear Layout and add Edit text
Different property that are used in layout.xml file explain here
- warp_content warp_content means height and width similar to the text that are entered.
- Match_parent means height and width similar to parent.
- Edit text The Edit Text control allows a user to enter text into an application
- Button When user click on a button show information
Search_content_layout.XML
- In this example we are going to create a simple UI that includes only (Text view) with Different attributes.And Write the following code into Search_content_layout.XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#A47DED"
>
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/search_name"
android:layout_alignParentLeft="true"
android:hint="Enter name"
/>
<Button
android:layout_width="125dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_toRightOf="@+id/search_name"
android:text="Search"
android:onClick="SearchContant"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:text="Email Here"
android:id="@+id/display_email"
android:layout_below="@+id/search_name"
android:textAppearance="?android:textAppearanceLarge"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/display_mobile"
android:layout_marginTop="50dp"
android:text="Mobile Here"
android:layout_below="@+id/display_email"
android:textAppearance="?android:textAppearanceLarge"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Contact"
android:id="@+id/button"
android:layout_marginTop="101dp"
android:onClick="DeleteContact"
android:layout_below="@+id/display_mobile"
android:layout_centerHorizontal="true" />
</RelativeLayout>
And Write the following code SearchContantActivity. java classpackage customspinner.alienslab.com.adddata;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
/**
* Created by on 6/27/2015.
*/
public class SearchContantActivity extends ActionBarActivity {
TextView Display_email,Display_mobile;
EditText Search_name;
UserDbHelper userDbHelper;
SQLiteDatabase sqLiteDatabase;
String search_name;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_contant_layout);
Search_name=(EditText)findViewById(R.id.search_name);
Display_mobile=(TextView)findViewById(R.id.display_mobile);
Display_email=(TextView)findViewById(R.id.display_email);
Display_email.setVisibility(View.GONE);
Display_mobile.setVisibility(View.GONE);
}
public void SearchContant(View view){
search_name=Search_name.getText().toString();
userDbHelper=new UserDbHelper(getApplicationContext());
sqLiteDatabase=userDbHelper.getReadableDatabase();
Cursor cursor=userDbHelper.getContact(search_name,sqLiteDatabase);
if(cursor.moveToFirst())
{
String MOBILE=cursor.getString(0);
String EMALL=cursor.getString(1);
Display_mobile.setText(MOBILE);
Display_email.setText(EMALL);
Display_email.setVisibility(view.VISIBLE);
Display_mobile.setVisibility(view.VISIBLE);
}
}
public void DeleteContact(View view){
userDbHelper=new UserDbHelper(getApplicationContext());
sqLiteDatabase=userDbHelper.getReadableDatabase();
userDbHelper.deleteinformation(search_name,sqLiteDatabase);
Toast.makeText(getApplication()," Deleted contant",Toast.LENGTH_LONG).show();
}
}
And Write the following code UserDbHandler. java classpackage customspinner.alienslab.com.adddata;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
/**
* Created on 6/22/2015.
*/
public class UserDbHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "USERINFO.DB";
private static final int DATABASE_VERSION = 5;
private static final String CREATE_QUERY = "CREATE TABLE " + UserContract.NewUserInfo.TABLE_NAME + "(id INTEGER, " +
UserContract.NewUserInfo.USER_NAME + " TEXT, " + UserContract.NewUserInfo.USER_MOB + " TEXT, "
+ UserContract.NewUserInfo.USER_EMAIL + " TEXT );";
public UserDbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
Log.e("DATABASE OPERATION", "Database created / opened.....");
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_QUERY);
Log.e("DATABASE OPERATION", "Table create..." + CREATE_QUERY);
}
public void addinnformation(String name, String mob, String email, SQLiteDatabase db) {
ContentValues contentValue = new ContentValues();
contentValue.put(UserContract.NewUserInfo.USER_NAME, name);
contentValue.put(UserContract.NewUserInfo.USER_MOB, mob);
contentValue.put(UserContract.NewUserInfo.USER_EMAIL, email);
db.insert(UserContract.NewUserInfo.TABLE_NAME, null, contentValue);
Log.e("DATABASE OPERATION", "One row is insert");
}
public Cursor getinformation(SQLiteDatabase db) {
Cursor cursor;
String[] projections = {UserContract.NewUserInfo.USER_NAME, UserContract.NewUserInfo.USER_MOB, UserContract.NewUserInfo.USER_EMAIL};
cursor = db.query(UserContract.NewUserInfo.TABLE_NAME, projections, null, null, null, null, null);
return cursor;
}
public Cursor getContact(String user_name, SQLiteDatabase sqLiteDatabase) {
String[] projections = {UserContract.NewUserInfo.USER_MOB, UserContract.NewUserInfo.USER_EMAIL};
String selection = UserContract.NewUserInfo.USER_NAME+" LIKE ?";
String[] seletion_args={user_name};
Cursor cursor=sqLiteDatabase.query(UserContract.NewUserInfo.TABLE_NAME,projections,selection,seletion_args,null,null,null);
return cursor;
}
public void deleteinformation(String user_name,SQLiteDatabase sqLiteDatabase){
String selection = UserContract.NewUserInfo.USER_NAME+" LIKE ?";
String[] seletion_args={user_name};
sqLiteDatabase.delete(UserContract.NewUserInfo.TABLE_NAME,selection,seletion_args);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
Run the Application
Run the application.And click on third button a new activity will open.And user enter a particular name for search and click on button the email and phone number related to name are appears .And if user want to delete a information click on delete button all the information will delete from database.
Conclusion
In this lecture we learn about Android SqLite database how can get Delete row from database.. I hope you will understand this lecture.Thank you for reading this lecture Hope you got the idea.
The post Delete row from android SQLite database appeared first on The Master World.