Android 在我的sql数据库中插入数据后应用程序崩溃
在我点击页面上的每个按钮（按钮更新、inschrijven、showallpople或delete）之后，所有与SQL数据库相关的按钮都会出现。。这是失败的。我不知道为什么，但我认为这与列名有关。我不明白 这是我所有页面的代码 这是我的SQLiteHelper类：Android 在我的sql数据库中插入数据后应用程序崩溃,android,database,sqlite,Android,Database,Sqlite,在我点击页面上的每个按钮（按钮更新、inschrijven、showallpople或delete）之后，所有与SQL数据库相关的按钮都会出现。。这是失败的。我不知道为什么，但我认为这与列名有关。我不明白 这是我所有页面的代码 这是我的SQLiteHelper类： package com.example.cedri.myapplication; import android.content.ContentValues; import android.content.Con
package com.example.cedri.myapplication;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
/**
* Created by cedri on 17/05/2016.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME= "KIND_DATABASE.db";
public static final String TABLE_NAME= "KIND_TABLE";
public static final int DATABASE_VERSION=1;
public static final String COL_1="ID";
public static final String COL_2="VOORNAAM";
public static final String COL_3="NAAM";
public static final String COL_4="LEEFTIJD";
public static final String COL_5="EMAIL";
private static final String CREATE_TABLE_KIND= "create table "+TABLE_NAME + " ( " +
COL_1 +" INTEGER PRIMARY KEY AUTOINCREMENT," +
COL_2+" TEXT," +
COL_3+ " TEXT," +
COL_4+ " INTEGER," +
COL_5+" TEXT);";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_KIND);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+TABLE_NAME);
onCreate(db);
}
public boolean insertData(String voornaam,String naam,Integer leeftijd,String email){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues=new ContentValues();
contentValues.put(COL_2,voornaam);
contentValues.put(COL_3,naam);
contentValues.put(COL_4,leeftijd);
contentValues.put(COL_5, email);
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 Integer deleteData(String email){
SQLiteDatabase db=this.getWritableDatabase();
return db.delete(TABLE_NAME,"EMAIL=?",new String[]{email});
}
public boolean updateData(String voornaam, String naam, Integer leeftijd, String email){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_2,voornaam);
contentValues.put(COL_3,naam);
contentValues.put(COL_4,leeftijd);
contentValues.put(COL_5, email);
db.update(TABLE_NAME,contentValues,"EMAIL = ?",new String[]{email});
return true;
}
}
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,menu3Fragment.OnMainFragmentInteractionListener {
DatabaseHelper myDb;
TextView txtVoornaam,txtNaam,txtLeeftijd,txtEmail;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
myDb = new DatabaseHelper(this);
}
public void btnUpdate_Click(View view){
boolean isUpdate = myDb.updateData(txtVoornaam.getText().toString(),
txtNaam.getText().toString(),
Integer.valueOf(txtLeeftijd.getText().toString()),
txtEmail.getText().toString());
if(isUpdate==true){
Toast.makeText(MainActivity.this,"De data is geupdate",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(MainActivity.this,"De data is niet geupdate",Toast.LENGTH_LONG).show();
}
}
public void btnDelete_Click(View view){
Integer isDelete = myDb.deleteData(
txtEmail.getText().toString());
if(isDelete>1){
Toast.makeText(MainActivity.this,"De data is verwijderd",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(MainActivity.this,"De data is niet verwijderd",Toast.LENGTH_LONG).show();
}
}
public void btnGaNaarIngeschrevenLeden_Click(View view) {
Cursor res=myDb.getAllData();
if(res.getCount() == 0){
//show message
showMessage("Error", "Er werd geen data gevonden");
return;
}
StringBuffer buffer = new StringBuffer();
while(res.moveToNext()){
buffer.append("Id :"+ res.getString(0) + "\n");
buffer.append("Voornaam :"+ res.getString(1) + "\n");
buffer.append("Naam :"+ res.getString(2) + "\n");
buffer.append("Leeftijd :"+ res.getInt(3) + "\n");
buffer.append("Email :"+ res.getString(4) + "\n\n");
}
//show all data
showMessage("Ingeschreven kinderen 2016", buffer.toString());
}
public void btnSchrijfIn_Click(View view) {
txtVoornaam= (TextView)findViewById(R.id.Voornaam);
txtNaam= (TextView)findViewById(R.id.Naam);
txtLeeftijd= (TextView)findViewById(R.id.Leeftijd);
txtEmail= (TextView)findViewById(R.id.Email);
boolean isInsertData =
myDb.insertData(
txtVoornaam.getText().toString(),
txtNaam.getText().toString(),
Integer.valueOf(txtLeeftijd.getText().toString()),
txtEmail.getText().toString() );
if(isInsertData==true){
//sendEmail();
Toast.makeText(MainActivity.this,"Uw kind werd succesvol ingeschreven!", Toast.LENGTH_LONG).show();
}
else
{
TextView foutmelding2=(TextView)findViewById(R.id.Foutmelding);
foutmelding2.setVisibility(TextView.VISIBLE);
}
Fragment fragment = new menu1Fragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction =fragmentManager.beginTransaction();
transaction.replace(R.id.main_content,fragment);
transaction.addToBackStack(null);
transaction.commit();
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.cedri.chiroeine.InschrijvenPage"
android:background="@color/backgroundzwart">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="@string/Inschrijving_titel"
android:drawableLeft="@drawable/test"
android:layout_marginLeft="45dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:textSize="20dp"
android:textColor="@color/achtergrond_inputvak"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="20dp"
android:layout_marginTop="50dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak1"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="58dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Voornaam"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak2"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="95dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Naam"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak3"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="82dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Leeftijd"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak4"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="100dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Email"/>
</LinearLayout>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_marginLeft="25dp"
android:layout_marginRight="75dp"
android:layout_marginTop="35dp"
android:textColor="@color/rooderror"
android:id="@+id/Foutmelding"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_btn_SchrijfIn"
android:background="@drawable/rounded_btn"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:layout_marginLeft="200dp"
android:id="@+id/SchrijfIn"
android:drawableLeft="@drawable/arrow"
android:onClick="btnSchrijfIn_Click"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="10dp">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_btn_GaNaarIngeschrevenLeden"
android:background="@drawable/rounded_btn"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:layout_marginLeft="10dp"
android:onClick="btnGaNaarIngeschrevenLeden_Click"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/UpdateText"
android:background="@drawable/rounded_btn"
android:layout_marginLeft="10dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:onClick="btnUpdate_Click"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/DeleteText"
android:background="@drawable/rounded_btn"
android:layout_marginLeft="10dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:onClick="btnDelete_Click"/>
</LinearLayout>
</LinearLayout>
package com.example.cedri.myapplication;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
/**
* Created by cedri on 17/05/2016.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME= "KIND_DATABASE.db";
public static final String TABLE_NAME= "KIND_TABLE";
public static final int DATABASE_VERSION=1;
public static final String COL_1="ID";
public static final String COL_2="VOORNAAM";
public static final String COL_3="NAAM";
public static final String COL_4="LEEFTIJD";
public static final String COL_5="EMAIL";
private static final String CREATE_TABLE_KIND= "create table "+TABLE_NAME + " ( " +
COL_1 +" INTEGER PRIMARY KEY AUTOINCREMENT," +
COL_2+" TEXT," +
COL_3+ " TEXT," +
COL_4+ " INTEGER," +
COL_5+" TEXT);";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_KIND);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+TABLE_NAME);
onCreate(db);
}
public boolean insertData(String voornaam,String naam,Integer leeftijd,String email){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues=new ContentValues();
contentValues.put(COL_2,voornaam);
contentValues.put(COL_3,naam);
contentValues.put(COL_4,leeftijd);
contentValues.put(COL_5, email);
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 Integer deleteData(String email){
SQLiteDatabase db=this.getWritableDatabase();
return db.delete(TABLE_NAME,"EMAIL=?",new String[]{email});
}
public boolean updateData(String voornaam, String naam, Integer leeftijd, String email){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_2,voornaam);
contentValues.put(COL_3,naam);
contentValues.put(COL_4,leeftijd);
contentValues.put(COL_5, email);
db.update(TABLE_NAME,contentValues,"EMAIL = ?",new String[]{email});
return true;
}
}
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,menu3Fragment.OnMainFragmentInteractionListener {
DatabaseHelper myDb;
TextView txtVoornaam,txtNaam,txtLeeftijd,txtEmail;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
myDb = new DatabaseHelper(this);
}
public void btnUpdate_Click(View view){
boolean isUpdate = myDb.updateData(txtVoornaam.getText().toString(),
txtNaam.getText().toString(),
Integer.valueOf(txtLeeftijd.getText().toString()),
txtEmail.getText().toString());
if(isUpdate==true){
Toast.makeText(MainActivity.this,"De data is geupdate",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(MainActivity.this,"De data is niet geupdate",Toast.LENGTH_LONG).show();
}
}
public void btnDelete_Click(View view){
Integer isDelete = myDb.deleteData(
txtEmail.getText().toString());
if(isDelete>1){
Toast.makeText(MainActivity.this,"De data is verwijderd",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(MainActivity.this,"De data is niet verwijderd",Toast.LENGTH_LONG).show();
}
}
public void btnGaNaarIngeschrevenLeden_Click(View view) {
Cursor res=myDb.getAllData();
if(res.getCount() == 0){
//show message
showMessage("Error", "Er werd geen data gevonden");
return;
}
StringBuffer buffer = new StringBuffer();
while(res.moveToNext()){
buffer.append("Id :"+ res.getString(0) + "\n");
buffer.append("Voornaam :"+ res.getString(1) + "\n");
buffer.append("Naam :"+ res.getString(2) + "\n");
buffer.append("Leeftijd :"+ res.getInt(3) + "\n");
buffer.append("Email :"+ res.getString(4) + "\n\n");
}
//show all data
showMessage("Ingeschreven kinderen 2016", buffer.toString());
}
public void btnSchrijfIn_Click(View view) {
txtVoornaam= (TextView)findViewById(R.id.Voornaam);
txtNaam= (TextView)findViewById(R.id.Naam);
txtLeeftijd= (TextView)findViewById(R.id.Leeftijd);
txtEmail= (TextView)findViewById(R.id.Email);
boolean isInsertData =
myDb.insertData(
txtVoornaam.getText().toString(),
txtNaam.getText().toString(),
Integer.valueOf(txtLeeftijd.getText().toString()),
txtEmail.getText().toString() );
if(isInsertData==true){
//sendEmail();
Toast.makeText(MainActivity.this,"Uw kind werd succesvol ingeschreven!", Toast.LENGTH_LONG).show();
}
else
{
TextView foutmelding2=(TextView)findViewById(R.id.Foutmelding);
foutmelding2.setVisibility(TextView.VISIBLE);
}
Fragment fragment = new menu1Fragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction =fragmentManager.beginTransaction();
transaction.replace(R.id.main_content,fragment);
transaction.addToBackStack(null);
transaction.commit();
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.cedri.chiroeine.InschrijvenPage"
android:background="@color/backgroundzwart">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="@string/Inschrijving_titel"
android:drawableLeft="@drawable/test"
android:layout_marginLeft="45dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:textSize="20dp"
android:textColor="@color/achtergrond_inputvak"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="20dp"
android:layout_marginTop="50dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak1"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="58dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Voornaam"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak2"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="95dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Naam"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak3"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="82dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Leeftijd"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak4"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="100dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Email"/>
</LinearLayout>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_marginLeft="25dp"
android:layout_marginRight="75dp"
android:layout_marginTop="35dp"
android:textColor="@color/rooderror"
android:id="@+id/Foutmelding"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_btn_SchrijfIn"
android:background="@drawable/rounded_btn"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:layout_marginLeft="200dp"
android:id="@+id/SchrijfIn"
android:drawableLeft="@drawable/arrow"
android:onClick="btnSchrijfIn_Click"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="10dp">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_btn_GaNaarIngeschrevenLeden"
android:background="@drawable/rounded_btn"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:layout_marginLeft="10dp"
android:onClick="btnGaNaarIngeschrevenLeden_Click"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/UpdateText"
android:background="@drawable/rounded_btn"
android:layout_marginLeft="10dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:onClick="btnUpdate_Click"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/DeleteText"
android:background="@drawable/rounded_btn"
android:layout_marginLeft="10dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:onClick="btnDelete_Click"/>
</LinearLayout>
</LinearLayout>
package com.example.cedri.myapplication;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
/**
* Created by cedri on 17/05/2016.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME= "KIND_DATABASE.db";
public static final String TABLE_NAME= "KIND_TABLE";
public static final int DATABASE_VERSION=1;
public static final String COL_1="ID";
public static final String COL_2="VOORNAAM";
public static final String COL_3="NAAM";
public static final String COL_4="LEEFTIJD";
public static final String COL_5="EMAIL";
private static final String CREATE_TABLE_KIND= "create table "+TABLE_NAME + " ( " +
COL_1 +" INTEGER PRIMARY KEY AUTOINCREMENT," +
COL_2+" TEXT," +
COL_3+ " TEXT," +
COL_4+ " INTEGER," +
COL_5+" TEXT);";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_KIND);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+TABLE_NAME);
onCreate(db);
}
public boolean insertData(String voornaam,String naam,Integer leeftijd,String email){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues=new ContentValues();
contentValues.put(COL_2,voornaam);
contentValues.put(COL_3,naam);
contentValues.put(COL_4,leeftijd);
contentValues.put(COL_5, email);
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 Integer deleteData(String email){
SQLiteDatabase db=this.getWritableDatabase();
return db.delete(TABLE_NAME,"EMAIL=?",new String[]{email});
}
public boolean updateData(String voornaam, String naam, Integer leeftijd, String email){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_2,voornaam);
contentValues.put(COL_3,naam);
contentValues.put(COL_4,leeftijd);
contentValues.put(COL_5, email);
db.update(TABLE_NAME,contentValues,"EMAIL = ?",new String[]{email});
return true;
}
}
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,menu3Fragment.OnMainFragmentInteractionListener {
DatabaseHelper myDb;
TextView txtVoornaam,txtNaam,txtLeeftijd,txtEmail;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
myDb = new DatabaseHelper(this);
}
public void btnUpdate_Click(View view){
boolean isUpdate = myDb.updateData(txtVoornaam.getText().toString(),
txtNaam.getText().toString(),
Integer.valueOf(txtLeeftijd.getText().toString()),
txtEmail.getText().toString());
if(isUpdate==true){
Toast.makeText(MainActivity.this,"De data is geupdate",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(MainActivity.this,"De data is niet geupdate",Toast.LENGTH_LONG).show();
}
}
public void btnDelete_Click(View view){
Integer isDelete = myDb.deleteData(
txtEmail.getText().toString());
if(isDelete>1){
Toast.makeText(MainActivity.this,"De data is verwijderd",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(MainActivity.this,"De data is niet verwijderd",Toast.LENGTH_LONG).show();
}
}
public void btnGaNaarIngeschrevenLeden_Click(View view) {
Cursor res=myDb.getAllData();
if(res.getCount() == 0){
//show message
showMessage("Error", "Er werd geen data gevonden");
return;
}
StringBuffer buffer = new StringBuffer();
while(res.moveToNext()){
buffer.append("Id :"+ res.getString(0) + "\n");
buffer.append("Voornaam :"+ res.getString(1) + "\n");
buffer.append("Naam :"+ res.getString(2) + "\n");
buffer.append("Leeftijd :"+ res.getInt(3) + "\n");
buffer.append("Email :"+ res.getString(4) + "\n\n");
}
//show all data
showMessage("Ingeschreven kinderen 2016", buffer.toString());
}
public void btnSchrijfIn_Click(View view) {
txtVoornaam= (TextView)findViewById(R.id.Voornaam);
txtNaam= (TextView)findViewById(R.id.Naam);
txtLeeftijd= (TextView)findViewById(R.id.Leeftijd);
txtEmail= (TextView)findViewById(R.id.Email);
boolean isInsertData =
myDb.insertData(
txtVoornaam.getText().toString(),
txtNaam.getText().toString(),
Integer.valueOf(txtLeeftijd.getText().toString()),
txtEmail.getText().toString() );
if(isInsertData==true){
//sendEmail();
Toast.makeText(MainActivity.this,"Uw kind werd succesvol ingeschreven!", Toast.LENGTH_LONG).show();
}
else
{
TextView foutmelding2=(TextView)findViewById(R.id.Foutmelding);
foutmelding2.setVisibility(TextView.VISIBLE);
}
Fragment fragment = new menu1Fragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction =fragmentManager.beginTransaction();
transaction.replace(R.id.main_content,fragment);
transaction.addToBackStack(null);
transaction.commit();
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.cedri.chiroeine.InschrijvenPage"
android:background="@color/backgroundzwart">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="@string/Inschrijving_titel"
android:drawableLeft="@drawable/test"
android:layout_marginLeft="45dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:textSize="20dp"
android:textColor="@color/achtergrond_inputvak"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="20dp"
android:layout_marginTop="50dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak1"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="58dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Voornaam"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak2"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="95dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Naam"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak3"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="82dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Leeftijd"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_inputvak4"
android:textColor="@color/bordeaurood"
android:textSize="20dp"/>
<EditText
android:layout_width="150dp"
android:layout_height="30dp"
android:layout_marginLeft="100dp"
android:layout_marginRight="15dp"
android:background="@color/achtergrond_inputvak"
android:id="@+id/Email"/>
</LinearLayout>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_marginLeft="25dp"
android:layout_marginRight="75dp"
android:layout_marginTop="35dp"
android:textColor="@color/rooderror"
android:id="@+id/Foutmelding"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_btn_SchrijfIn"
android:background="@drawable/rounded_btn"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:layout_marginLeft="200dp"
android:id="@+id/SchrijfIn"
android:drawableLeft="@drawable/arrow"
android:onClick="btnSchrijfIn_Click"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="10dp">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Inschrijving_btn_GaNaarIngeschrevenLeden"
android:background="@drawable/rounded_btn"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:layout_marginLeft="10dp"
android:onClick="btnGaNaarIngeschrevenLeden_Click"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/UpdateText"
android:background="@drawable/rounded_btn"
android:layout_marginLeft="10dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:onClick="btnUpdate_Click"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/DeleteText"
android:background="@drawable/rounded_btn"
android:layout_marginLeft="10dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:onClick="btnDelete_Click"/>
</LinearLayout>
</LinearLayout>
日志显示您正试图将数据库从版本200降级为1。
ondownggrade（）解决方案onDowngrade（）@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
onCreate(db);
}
给我们看看日志。如果不阅读logcat，任何人都无法猜到你的应用程序中发生了什么。欢迎使用StackOverflow！为了帮助其他人理解您的问题，请发布代码示例、任何日志的输出（例如LogCat）或其他东西，以演示您的问题。但是我尝试过，但他们认为这是垃圾邮件，截图好吗？对于引发的异常，请用LogCat输出替换布局代码。卸载并重新安装应用程序。您的数据库中存在一些不一致之处。如果答案对你有帮助，就接受它。你做得很好，我的朋友！真的谢谢！！我是新来的，我必须达到前15名的声誉：/抱歉，但真的谢谢！您可以通过单击勾号符号来接受。它不需要名声。