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Я занимаюсь копированием и вставкой учебника по SQLite из новой серии андроидов boston. Я сделал все, что он сделал, но когда я компилирую. Консоль сообщает мне, что у меня есть синтаксическая ошибка или отсутствует база данных. Я довольно уверен, что у меня нет синтаксической ошибки. Вот мой код и консольное сообщение.Отсутствует ошибка базы данных в студии android?
MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
EditText input;
TextView productText;
MyDBHandler dbHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
input = (EditText)findViewById(R.id.editText_ID);
productText = (TextView)findViewById(R.id.textOutput_ID);
dbHandler = new MyDBHandler(this, null, null, 1);
printDatabase();
}
//add a product to the database
public void addButtonClicked(View view){
Products product = new Products(input.getText().toString());
dbHandler.addProduct(product);
printDatabase();
}
//delete items
public void deleteButtonClicked(View view){
String inputText = input.getText().toString();
dbHandler.deleteProduct(inputText);
printDatabase();
}
public void printDatabase(){
String dbString = dbHandler.databaseToString();
productText.setText(dbString);
input.setText("");
}
}
MyDBHandler.java
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.Cursor;
import android.content.Context;
import android.content.ContentValues;
public class MyDBHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "products.db";
public static final String TABLE_PRODUCTS = "products";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_PRODUCTNAME = "productname";
public MyDBHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, DATABASE_NAME, factory, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String query = "CREATE_TABLE " + TABLE_PRODUCTS + "(" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT " +
COLUMN_PRODUCTNAME + " TEXT " +
");";
db.execSQL(query);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP_TABLE IF EXISTS " + TABLE_PRODUCTS);
onCreate(db);
}
//add a new row to the database
public void addProduct(Products product){
ContentValues values = new ContentValues();
values.put(COLUMN_PRODUCTNAME, product.get_productname());
SQLiteDatabase db = getWritableDatabase();
db.insert(TABLE_PRODUCTS, null, values);
db.close();
}
//delete a product from the database
public void deleteProduct(String productName){
SQLiteDatabase db = getWritableDatabase();
db.execSQL("DELETE_FROM " + TABLE_PRODUCTS + " WHERE " + COLUMN_PRODUCTNAME + "=\"" + productName + "\";");
}
//print out the database as a string
public String databaseToString(){
String dbString = "";
SQLiteDatabase db = getWritableDatabase();
String query = "SELECT * FROM " + TABLE_PRODUCTS + " WHERE 1";
//Cursor point to location in your results
Cursor c = db.rawQuery(query, null);
//Move to the first row in your results
c.moveToFirst();
while(!c.isAfterLast()){
if(c.getString(c.getColumnIndex("productname")) != null){
dbString += c.getString(c.getColumnIndex("productname"));
dbString += "\n";
}
}
db.close();
return dbString;
}
}
Products.java
public class Products {
private int _id;
private String _productname;
public Products(){
}
public Products(String productname){
this._productname = productname;
}
public void set_id(int _id) {
this._id = _id;
}
public void set_productname(String _productname) {
this._productname = _productname;
}
public int get_id() {
return _id;
}
public String get_productname() {
return _productname;
}
}
Console Message
D/RelationGraph: garbageCollect()
W/ResourcesManager: getTopLevelResources: /data/app/com.example.emilythacker.myapplication-1/base.apk/1.0 running in com.example.emilythacker.myapplication rsrc of package com.example.emilythacker.myapplication
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
E/SQLiteLog: (1) near "CREATE_TABLE": syntax error
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.emilythacker.myapplication, PID: 2125
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.emilythacker.myapplication/com.example.emilythacker.myapplication.MainActivity}: android.database.sqlite.SQLiteException: near "CREATE_TABLE": syntax error (code 1): , while compiling: CREATE_TABLE products(_id INTEGER PRIMARY KEY AUTOINCREMENT productname TEXT);
#################################################################
Error Code : 1 (SQLITE_ERROR)
Caused By : SQL(query) error or missing database.
(near "CREATE_TABLE": syntax error (code 1): , while compiling: CREATE_TABLE products(_id INTEGER PRIMARY KEY AUTOINCREMENT productname TEXT);)
#################################################################
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.database.sqlite.SQLiteException: near "CREATE_TABLE": syntax error (code 1): , while compiling: CREATE_TABLE products(_id INTEGER PRIMARY KEY AUTOINCREMENT productname TEXT);
#################################################################
Error Code : 1 (SQLITE_ERROR)
Caused By : SQL(query) error or missing database.
(near "CREATE_TABLE": syntax error (code 1): , while compiling: CREATE_TABLE products(_id INTEGER PRIMARY KEY AUTOINCREMENT productname TEXT);)
#################################################################
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1058)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:623)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1812)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1743)
at com.example.emilythacker.myapplication.MyDBHandler.onCreate(MyDBHandler.java:32)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at com.example.emilythacker.myapplication.MyDBHandler.databaseToString(MyDBHandler.java:59)
at com.example.emilythacker.myapplication.MainActivity.printDatabase(MainActivity.java:41)
at com.example.emilythacker.myapplication.MainActivity.onCreate(MainActivity.java:23)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
... 9 more
Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'