我从版本 1 向数据库添加了 3 个新列，因此我将其更改为版本 2，但现在当我使用使用数据库的 Activity 时，我的应用程序崩溃并在 logcat 中显示这一点。
04-02 18:41:09.013: E/AndroidRuntime(19171): FATAL EXCEPTION: main 04-02 18:41:09.013: E/AndroidRuntime(19171): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fullfrontalgames.numberfighter/com.fullfrontalgames.numberfighter.AccountSettings}: android.database.sqlite.SQLiteException: near "CREATE": syntax error (code 1): , while compiling: create table NFDB( ID integer primary key autoincrement,USERNAME text CREATE UNIQUE INDEX idx_keytype ON tableName (USERNAME);USERNAME text,PASSWORD text,EMAIL text,NUMBERINPUT text,SCORE text,FRIENDS text);
04-02 18:41:09.013: E/AndroidRuntime(19171): Caused by: android.database.sqlite.SQLiteException: near "CREATE": syntax error (code 1): , while compiling: create table NFDB( ID integer primary key autoincrement,USERNAME text CREATE UNIQUE INDEX idx_keytype ON tableName (USERNAME);USERNAME text,PASSWORD text,EMAIL text,NUMBERINPUT text,SCORE text,FRIENDS text);
我在任何地方都看不到语法错误，并且我有 DBHelper 帮助器类来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;
}
}
package 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); } }
最佳答案
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。
你必须像这样更正它:
DATABASE_CREATE = "create table NFDB("
+ "ID integer primary key autoincrement, "
+ "USERNAME text, PASSWORD text, "
+ "EMAIL text, NUMBERINPUT text, "
+ "SCORE text, FRIENDS text)";
第二个声明:
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);
关于java - SQLite数据库升级后崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15775937/