升级后SQLitedatabase崩溃

Question

我从版本1向数据库添加了3个新列，因此将其更改为版本2，但是现在当我使用使用数据库的活动时，我的应用程序崩溃并在logcat中显示。

04-02 18：41：09.013：E / AndroidRuntime（19171）：致命异常：主04-02 18：41：09.013：E / AndroidRuntime（19171）：java.lang.RuntimeException：无法启动活动ComponentInfo {com。 fullfrontalgames.numberfighter / com.fullfrontalgames.numberfighter.AccountSettings}：android.database.sqlite.SQLiteException：在“ CREATE”附近：语法错误（代码1）：，在编译时：创建表NFDB（ID整数主键自动递增，USERNAME文本CREATE唯一索引idx_keytype ON tableName（USERNAME）； USERNAME文本，PASSWORD文本，EMAIL文本，NUMBERINPUT文本，SCORE文本，FRIENDS文本）；

04-02 18：41：09.013：E / AndroidRuntime（19171）：原因：android.database.sqlite.SQLiteException：在“ CREATE”附近：语法错误（代码1）：，在编译时：创建表NFDB（ID整数主密钥自动递增，USERNAME文本，在tableName（USERNAME）上创建唯一索引idx_keytype； USERNAME文本，PASSWORD文本，EMAIL文本，NUMBERINPUT文本，SCORE文本，FRIENDS文本）；

我在任何地方都看不到语法错误，并且使用DBHelper helperclass删除旧表并创建新表。

这是我的DBAdapter和DBHelper类的代码

    package com.fullfrontalgames.numberfighter;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;


public class DBAdapter
{
        static final String DATABASE_NAME = "NFDB.db";
        static final int DATABASE_VERSION = 2;
        public static final int NAME_COLUMN = 1;
        // TODO: Create public field for each column in your table.
        // SQL Statement to create a new database.
        static final String DATABASE_CREATE = "create table "+"NFDB"+
                                     "( " +"ID"+" integer primary key autoincrement,"+ "USERNAME  text CREATE UNIQUE INDEX idx_keytype ON tableName (USERNAME);" +
                                            "PASSWORD text,EMAIL text,NUMBERINPUT text,SCORE text,FRIENDS text); "; 
        // Variable to hold the database instance
        public  SQLiteDatabase db;
        // Context of the application using the database.
        private final Context context;
        // Database open/upgrade helper
        private DataBaseHelper DBHelper;
        public  DBAdapter(Context _context)
        {
            context = _context;
            DBHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
        }
        public  DBAdapter open() throws SQLException
        {
            db = DBHelper.getWritableDatabase();
            return this;
        }
        public void close()
        {
            db.close();
        }

        public  SQLiteDatabase getDatabaseInstance()
        {
            return db;
        }

        public void insertEntry(String userName,String password,String email)
        {
           ContentValues newValues = new ContentValues();
            // Assign values for each row.
            newValues.put("USERNAME", userName);
            newValues.put("PASSWORD",password);
            newValues.put("EMAIL", email);
            // Insert the row into your table
            db.insert("NFDB", null, newValues);
            ///Toast.makeText(context, "Reminder Is Successfully Saved", Toast.LENGTH_LONG).show();
        }
        public int deleteEntry(String userName)
        {
            //String id=String.valueOf(ID);
            String where="USERNAME=?";
            int numberOFEntriesDeleted= db.delete("NFDB", where, new String[]{userName}) ;
           // Toast.makeText(context, "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
            return numberOFEntriesDeleted;
        }    
        public String getSinlgeEntry(String userName)
        {
            Cursor cursor=db.query("NFDB", null, " USERNAME=?", new String[]{userName}, null, null, null);
            if(cursor.getCount()<1) // UserName Not Exist
            {
                cursor.close();
                return "NOT EXIST";
            }
            cursor.moveToFirst();
            String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
            cursor.close();
            return password;

        }
        public void  updateEntry(String userName,String password)
        {
            // Define the updated row content.
            ContentValues updatedValues = new ContentValues();
            // Assign values for each row.
            updatedValues.put("USERNAME", userName);
            updatedValues.put("PASSWORD",password);


            String where="USERNAME = ?";
            db.update("NFDB",updatedValues, where, new String[]{userName});              
        }
        public String getData() {
            String[] columns = new String[] { "ID", "USERNAME"};
            Cursor c = db.query("NFDB", columns, null, null, null, null, null, null);
            String result ="";
            int iRow = c.getColumnIndex("ID");
            int iName = c.getColumnIndex("USERNAME");

            for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
                result = result + c.getString(iRow) + " " + c.getString(iName) + "/n";
            }

            return result;
        }

        public String getUsername(String searchName) {
            Cursor c = db.query("NFDB",
                                new String[] { "USERNAME" },
                                "USERNAME = ?",
                                new String[] { searchName },
                                null, null, null);
            if (c.moveToNext())
                return c.getString(0);
            else
                return "";
        }
        public void InsertScore(String Username,String Score)
        {
            ContentValues ScoreValues = new ContentValues();
            ScoreValues.put("USERNAME", Username);
            ScoreValues.put("SCORE", Score);
            db.insert("NFDB", null, ScoreValues);

        }
        public String GetGameScore(String Username,String Score)
        {
            Cursor cursor = db.query("NFDB", null, "USERNAME",new String[]{Username,Score}, null, null, null);
            cursor.moveToFirst();
            cursor.close();
            return Username;
        }
        public String GetAllScore()
        {
            String[] columns = new String[] {"ID","USERNAME","SCORE"};
            Cursor cursor = db.query("NFDB", columns, null, null, null, null, null);
            String result="";
            int iRow = cursor.getColumnIndex("ID");
            int iUsername = cursor.getColumnIndex("USERNAME");
            int iScore = cursor.getColumnIndex("SCORE");

            for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
                result = result + cursor.getString(iRow) + " " + cursor.getString(iUsername) + " " + cursor.getString(iScore) + "/n";
            }
            return result;
            }

        public void InsertNumber(String Username,String Number)
        {
            ContentValues NumberValues = new ContentValues();
            NumberValues.put("USERNAME", Username);
            NumberValues.put("NUMBERINPUT", Number);
            db.insert("NFDB", null, NumberValues);
            }

        public String GetNumber(String Username,String Number)
        {
            Cursor cursor = db.query("NFDB", null, "USERNAME", new String[]{Username,Number}, null, null, null, null);
            cursor.moveToFirst();
            cursor.close();
            return Username;
        }

        public String GetAllNumbers()
        {
            String[] columns = new String[] {"ID","USERNAME","NUMBERINPUT"};
            Cursor cursor = db.query("NFDB", columns, null, null, null, null, null, null);
            String result="";
            int iRow = cursor.getColumnIndex("ID");
            int iName = cursor.getColumnIndex("USERNAME");
            int iNumber = cursor.getColumnIndex("NUMBERINPUT");

            for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
                result = result + cursor.getString(iRow) + " " + cursor.getString(iName) + " " + cursor.getString(iNumber) + "/n";
            }
            return result;

            }
        public void InsertFriends (String Username,String Friends)
        {
            ContentValues FriendValues = new ContentValues();
            FriendValues.put("USERNAME", Username);
            FriendValues.put("FRIENDS", Friends);
            db.insert("NFDB", null, FriendValues);
        }

        public int DeleteFriends(String Username,String Friends)
        {
            String where = "USERNAME=?,FRIENDS=?";
            int numberOfEntriesDeleted = db.delete("NFDB", where, new String[]{Username,Friends});
            return numberOfEntriesDeleted;
        }

        public String GetFriend(String Username,String Friend)
        {
            Cursor cursor = db.query("NFDB", null, "USERNAME", new String[]{Username,Friend}, null, null, null, null);
            cursor.moveToFirst();
            cursor.close();
            return Username;
        }


        public String GetAllFriends()
        {
            String[] columns = new String[] {"ID","USERNAME","FRIENDS"};
            Cursor cursor = db.query("NFDB", columns, null, null, null, null, null, null);
            String result="";
            int iRow = cursor.getColumnIndex("ID");
            int iName = cursor.getColumnIndex("USERNAME");
            int iFriends = cursor.getColumnIndex("FRIENDS");

            for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
                result = result + cursor.getString(iRow) + " " + cursor.getString(iName) + " " + cursor.getString(iFriends) + "/n";
            }
            return result;

            }


        }

包com.fullfrontalgames.numberfighter;

 import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteDatabase.CursorFactory; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; public class DataBaseHelper extends SQLiteOpenHelper { public DataBaseHelper(Context context, String name,CursorFactory factory, int version) { super(context, name, factory, version); } // TODO Auto-generated constructor stub // Called when no database exists in disk and the helper class needs // to create a new one. @Override public void onCreate(SQLiteDatabase _db) { _db.execSQL(DBAdapter.DATABASE_CREATE); } // Called when there is a database version mismatch meaning that the version // of the database on disk needs to be upgraded to the current version. @Override public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion) { // Log the version upgrade. Log.w("TaskDBAdapter", "Upgrading from version " +_oldVersion + " to " +_newVersion + ", which will destroy all old data"); // Upgrade the existing database to conform to the new version. Multiple // previous versions can be handled by comparing _oldVersion and _newVersion // values. // The simplest case is to drop the old table and create a new one. _db.execSQL("DROP TABLE IF EXISTS " + "NFDB"); // Create a new one. onCreate(_db); } } 

Answer 1

您的DML语句不正确。 索引创建不能在CREATE TABLE语句中使用。 它必须有自己的声明。

您必须像这样纠正它：

DATABASE_CREATE = "create table NFDB("
                   + "ID integer primary key autoincrement, "
                   + "USERNAME text, PASSWORD text, "
                   + "EMAIL text, NUMBERINPUT text, "
                   + "SCORE text, FRIENDS text)"; 

第二句话：

CREATE_INDEX_KEYTYPE = "CREATE UNIQUE INDEX idx_keytype ON tableName(USERNAME)";

最后，在您的SQLiteOpenHelper子类实现中，执行以下操作：

_db.execSQL(DBAdapter.DATABASE_CREATE);
_db.execSQL(DBAdapter.CREATE_INDEX_KEYTYPE);