Sqlite Example in Android
36 views.actvity_main.xml
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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:tools="http://schemas.android.com/tools" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="Name" android:id="@+id/textView" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="Surname" android:id="@+id/textView2" android:layout_below="@+id/editText_name" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="Marks" android:id="@+id/textView3" android:layout_below="@+id/editText_surname" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editText_name" android:layout_alignTop="@+id/textView" android:layout_toRightOf="@+id/textView" android:layout_toEndOf="@+id/textView" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editText_surname" android:layout_alignTop="@+id/textView2" android:layout_toRightOf="@+id/textView2" android:layout_toEndOf="@+id/textView2" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editText_Marks" android:layout_below="@+id/editText_surname" android:layout_toRightOf="@+id/textView3" android:layout_toEndOf="@+id/textView3" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Add Data" android:id="@+id/button_add" android:layout_below="@+id/editText_Marks" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_marginTop="76dp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="View All" android:id="@+id/button_viewAll" android:layout_above="@+id/button_update" android:layout_centerHorizontal="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Update" android:id="@+id/button_update" android:layout_below="@+id/button_add" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Delete" android:id="@+id/button_delete" android:layout_centerVertical="true" android:layout_below="@+id/button_viewAll" android:layout_alignLeft="@+id/button_viewAll" android:layout_alignStart="@+id/button_viewAll" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="id" android:id="@+id/textView_id" android:layout_below="@+id/editText_Marks" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editText_id" android:layout_alignTop="@+id/textView_id" android:layout_toRightOf="@+id/textView3" android:layout_toEndOf="@+id/textView3" /> </RelativeLayout> |
MainActivity.Java
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package com.androindian.raj.sqlite; import android.database.Cursor; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity { DatabaseHelper myDb; EditText editName,editSurname,editMarks ,editTextId; Button btnAddData; Button btnviewAll; Button btnDelete; Button btnviewUpdate; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); myDb= new DatabaseHelper(this); editName = (EditText)findViewById(R.id.editText_name); editSurname = (EditText)findViewById(R.id.editText_surname); editMarks = (EditText)findViewById(R.id.editText_Marks); editTextId = (EditText)findViewById(R.id.editText_id); btnAddData = (Button)findViewById(R.id.button_add); btnviewAll = (Button)findViewById(R.id.button_viewAll); btnviewUpdate= (Button)findViewById(R.id.button_update); btnDelete= (Button)findViewById(R.id.button_delete); AddData(); viewAll(); UpdateData(); DeleteData(); } public void DeleteData() { btnDelete.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Integer deletedRows = myDb.deleteData(editTextId.getText().toString()); if(deletedRows > 0) Toast.makeText(MainActivity.this,"Data Deleted",Toast.LENGTH_LONG).show(); else Toast.makeText(MainActivity.this,"Data not Deleted",Toast.LENGTH_LONG).show(); } } ); } public void UpdateData() { btnviewUpdate.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { boolean isUpdate = myDb.updateData(editTextId.getText().toString(), editName.getText().toString(), editSurname.getText().toString(),editMarks.getText().toString()); if(isUpdate == true) Toast.makeText(MainActivity.this,"Data Update",Toast.LENGTH_LONG).show(); else Toast.makeText(MainActivity.this,"Data not Updated",Toast.LENGTH_LONG).show(); } } ); } public void AddData() { btnAddData.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { boolean isInserted = myDb.insertData(editName.getText().toString(), editSurname.getText().toString(), editMarks.getText().toString() ); if(isInserted == true) Toast.makeText(MainActivity.this,"Data Inserted",Toast.LENGTH_LONG).show(); else Toast.makeText(MainActivity.this,"Data not Inserted",Toast.LENGTH_LONG).show(); } } ); } public void viewAll() { btnviewAll.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Cursor res = myDb.getAllData(); if(res.getCount() == 0) { // show message showMessage("Error","Nothing found"); return; } StringBuffer buffer = new StringBuffer(); while (res.moveToNext()) { buffer.append("Id :"+ res.getString(0)+"\n"); buffer.append("Name :"+ res.getString(1)+"\n"); buffer.append("Surname :"+ res.getString(2)+"\n"); buffer.append("Marks :"+ res.getString(3)+"\n\n"); } // Show all data showMessage("Data",buffer.toString()); } } ); } public void showMessage(String title,String Message){ AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setCancelable(true); builder.setTitle(title); builder.setMessage(Message); builder.show(); } } |
DataBaseHelper.java
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package com.androindian.raj.sqlite; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DatabaseHelper extends SQLiteOpenHelper { public static final String DATABASE_NAME = "Student.db"; public static final String TABLE_NAME = "student_table"; public static final String COL_1 = "ID"; public static final String COL_2 = "NAME"; public static final String COL_3 = "SURNAME"; public static final String COL_4 = "MARKS"; public DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, 1); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("create table " + TABLE_NAME +" " + "(ID INTEGER PRIMARY KEY AUTOINCREMENT," + "NAME TEXT,SURNAME TEXT,MARKS INTEGER)"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME); onCreate(db); } public boolean insertData(String name, String surname,String marks) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues contentValues = new ContentValues(); contentValues.put(COL_2,name); contentValues.put(COL_3,surname); contentValues.put(COL_4,marks); long result = db.insert(TABLE_NAME,null ,contentValues); if(result == -1) return false; else return true; } public Cursor getAllData() { SQLiteDatabase db = this.getWritableDatabase(); Cursor res = db.rawQuery("select * from "+TABLE_NAME,null); return res; } public boolean updateData(String id,String name,String surname,String marks) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues contentValues = new ContentValues(); contentValues.put(COL_1,id); contentValues.put(COL_2,name); contentValues.put(COL_3,surname); contentValues.put(COL_4,marks); db.update(TABLE_NAME, contentValues, "ID = ?",new String[] { id }); return true; } public Integer deleteData (String id) { SQLiteDatabase db = this.getWritableDatabase(); return db.delete(TABLE_NAME, "ID = ?",new String[] {id}); } } |
