问题
i think function onUpgrade is not working becuase before i add a new table .it's not error. when i add category table (a new table) . i change database_version = 2 from 1 when i run emulator .log cat sue "No such table category" and i don't know how to modify it. please check and tell me why onUpgrade isn't work.
This is my code (BookDBHelper)
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class BooksDBHelper extends SQLiteOpenHelper {
//databse_name
public static String DATABSE_NAME = "bookguk";
// database_version
protected static final int DATABASE_VERSION = 2; // <<<---i have changed it to version 2 from version 1 when add a new table category
//table name
public static String TABLE_BOOK = "books";
public static String TABLE_IMAGE = "images";
public static String TABLE_INGREDIENT = "ingredients";
public static String TABLE_CATEGORY = "category";
//column_name
public static String KEY_ID = "id";
public static String KEY_TITLE = "title";
public static String KEY_SOLUTION = "solution";
public static String KEY_BOK_ID = "bookID";
public static String KEY_fILEPATH = "filepath";
public static String KEY_VALUE = "value" ;
public static String KEY_UNIT = "unit";
public static String KEY_NAME = "name";
public static String KEY_CAT_ID = "cat_id";
public static String BOOK_CREATE_SQL = "CREATE TABLE IF NOT EXISTS " + TABLE_BOOK + "(" +
""+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT," +
""+KEY_TITLE+" TEXT(50) not null," +
""+KEY_SOLUTION+" TEXT(255) not null," +
""+KEY_CAT_ID+" INTEGER(11)," +
" FOREIGN KEY("+KEY_CAT_ID+") REFERENCE "+TABLE_CATEGORY+" ("+KEY_ID+"))";
public static String IMAGE_CREATE_SQL = "CREATE TABLE IF NOT EXISTS " + TABLE_IMAGE + "(" +
""+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT," +
""+KEY_fILEPATH+" VACHAR(255)," +
""+KEY_BOK_ID+" INTEGER(11)," +
" FOREIGN KEY("+KEY_BOK_ID+") REFERENCES "+TABLE_BOOK+" ("+KEY_ID+"))";
public static String INGREDIENT_CREATE_SQL = "CREATE TABLE IF NOT EXISTS " + TABLE_INGREDIENT + "(" +
""+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT," +
""+KEY_VALUE+" DOUBLE(11)," +
""+KEY_UNIT+" VACHAR(50)," +
""+KEY_fILEPATH+" VACHAR(255)," +
""+KEY_BOK_ID+" INTEGER(11)," +
" FOREIGN KEY("+KEY_BOK_ID+")REFERENCES "+TABLE_BOOK+" ("+KEY_ID+"))";
public static String CATEGORY_CREATE_SQL = "CREATE TABLE IF NOT EXISTS " + TABLE_CATEGORY + "(" +
""+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT," +
""+KEY_NAME+" VACHAR(50) " +
")";
//constructor
public BooksDBHelper(Context context) {
super(context, DATABSE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
//create
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CATEGORY_CREATE_SQL);
db.execSQL(BOOK_CREATE_SQL);
db.execSQL(IMAGE_CREATE_SQL);
db.execSQL(INGREDIENT_CREATE_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TABLE_BOOK );
db.execSQL("DROP TABLE IF EXISTS " + TABLE_IMAGE );
db.execSQL("DROP TABLE IF EXISTS " + TABLE_INGREDIENT );
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CATEGORY );
onCreate(db);
}
}
This is my operator (insert data to table category)
package com.example.mutitablesql.db;
import java.util.ArrayList;
import com.example.mutitablesql.entry.BookEntry;
import com.example.mutitablesql.entry.CategoryEntry;
import com.example.mutitablesql.entry.ImageEntry;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
public class BooksDB {
//นำ class booksDBHelper มาสร้างเป็น object
private BooksDBHelper helper;
private SQLiteDatabase db;
//สร้าง constructor
public BooksDB(Context context){
// คำสั่ง เรียก constructor ของclass BooksDBHelper
helper = new BooksDBHelper(context);
db = helper.getWritableDatabase();
}
//insert into table category
public long insertCategory(String name){
ContentValues values = new ContentValues();
values.put(BooksDBHelper.KEY_NAME, name);
return db.insert(BooksDBHelper.TABLE_CATEGORY, null, values);
}
my mainactivity code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
db = new BooksDB(context);
db.insertCategory("ต้ม");
db.insertCategory("ผัด");
db.insertCategory("แกง");
db.insertCategory("ทอด");
db.insertCategory("ประเภทเส้น");
db.insertCategory("เครื่องดื่ม");
db.insertCategory("ของหวาน");
}
this is my logcat edit
09-02 09:47:29.869: E/SQLiteLog(1220): (1) near "REFERENCE": syntax error
09-02 09:47:29.889: D/AndroidRuntime(1220): Shutting down VM
09-02 09:47:29.889: W/dalvikvm(1220): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
09-02 09:47:29.919: E/AndroidRuntime(1220): FATAL EXCEPTION: main
09-02 09:47:29.919: E/AndroidRuntime(1220): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mutitablesql/com.example.mutitablesql.MainActivity}: android.database.sqlite.SQLiteException: near "REFERENCE": syntax error (code 1): , while compiling: CREATE TABLE IF NOT EXISTS books(id INTEGER PRIMARY KEY AUTOINCREMENT,title TEXT(50) not null,solution TEXT(255) not null,cat_id INTEGER(11), FOREIGN KEY(cat_id) REFERENCE category (id))
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.os.Handler.dispatchMessage(Handler.java:99)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.os.Looper.loop(Looper.java:137)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-02 09:47:29.919: E/AndroidRuntime(1220): at java.lang.reflect.Method.invokeNative(Native Method)
09-02 09:47:29.919: E/AndroidRuntime(1220): at java.lang.reflect.Method.invoke(Method.java:511)
09-02 09:47:29.919: E/AndroidRuntime(1220): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-02 09:47:29.919: E/AndroidRuntime(1220): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-02 09:47:29.919: E/AndroidRuntime(1220): at dalvik.system.NativeStart.main(Native Method)
09-02 09:47:29.919: E/AndroidRuntime(1220): Caused by: android.database.sqlite.SQLiteException: near "REFERENCE": syntax error (code 1): , while compiling: CREATE TABLE IF NOT EXISTS books(id INTEGER PRIMARY KEY AUTOINCREMENT,title TEXT(50) not null,solution TEXT(255) not null,cat_id INTEGER(11), FOREIGN KEY(cat_id) REFERENCE category (id))
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1663)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1594)
09-02 09:47:29.919: E/AndroidRuntime(1220): at com.example.mutitablesql.db.BooksDBHelper.onCreate(BooksDBHelper.java:67)
09-02 09:47:29.919: E/AndroidRuntime(1220): at com.example.mutitablesql.db.BooksDBHelper.onUpgrade(BooksDBHelper.java:82)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
09-02 09:47:29.919: E/AndroidRuntime(1220): at com.example.mutitablesql.db.BooksDB.<init>(BooksDB.java:23)
09-02 09:47:29.919: E/AndroidRuntime(1220): at com.example.mutitablesql.MainActivity.onCreate(MainActivity.java:21)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.Activity.performCreate(Activity.java:5104)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-02 09:47:29.919: E/AndroidRuntime(1220): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
09-02 09:47:29.919: E/AndroidRuntime(1220): ... 11 more
回答1:
Taking a look into your onUpgrade code:
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXITS " + TABLE_BOOK );
db.execSQL("DROP TABLE IF EXITS " + TABLE_IMAGE );
db.execSQL("DROP TABLE IF EXITS " + TABLE_INGREDIENT );
db.execSQL("DROP TABLE IF EXITS " + TABLE_CATEGORY );
onCreate(db);
}
I realize that you have a mispelling error, EXITS is EXISTS
回答2:
You need to create Category table first as book table having reference in category table.
//create
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CATEGORY_CREATE_SQL);
db.execSQL(BOOK_CREATE_SQL);
db.execSQL(IMAGE_CREATE_SQL);
db.execSQL(INGREDIENT_CREATE_SQL);
}
回答3:
You are miss S change it from REFERENCE to REFERENCES
来源：https://stackoverflow.com/questions/18570005/no-such-table-when-i-add-a-new-table