重复的列名lock_status

我在数据库和onUpgrade（）Alter Table中添加了lock_status列，但是当我尝试打开我的应用程序时，它强制停止并出现以下错误。我应该在onUpgrade（）中做什么，我已经用新列更新了我的数据库第四次。帮助高度赞赏。重复的列名lock_status

Caused by: android.database.sqlite.SQLiteException: duplicate column name: lock_status (code 1): , while compiling: ALTER TABLE notes ADD COLUMN lock_status INT 
    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887) 
    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498) 
    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
    at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
    at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674) 
    at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1605) 
    at com.revodroid.notes.notes.Adapter.DatabaseHelper.onUpgrade(DatabaseHelper.java:89) 
    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:256) 
    at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187) 
    at com.revodroid.notes.notes.Adapter.DatabaseHelper.getAllNotes(DatabaseHelper.java:170) 
    at com.revodroid.notes.notes.Activity.MainActivity.setupNotesAdapter(MainActivity.java:603) 
    at com.revodroid.notes.notes.Activity.MainActivity.onCreate(MainActivity.java:256) 
    at android.app.Activity.performCreate(Activity.java:6251)

我的数据库代码：作为现在写会尝试添加列LOCK_STATUS 每时候你的数据库版本增加

public class DatabaseHelper extends SQLiteOpenHelper { 

private static final String LOG=DatabaseHelper.class.getSimpleName(); 
private static final int DATABASE_VERSION=4; 
public static final String DATABASE_NAME="NotesDB"; 
public SQLiteDatabase database; 

private final Context context; 

DatabaseHelper databaseHelper; 

public static final String TABLE_NOTES="notes"; 
public static final String TABLE_PASSCODE = "passcodetable"; 

public static final String KEY_ID="id"; 
public static final String KEY_TITLE="title"; 
public static final String KEY_CONTENT="content"; 
public static final String KEY_UPDATED_AT="updated_at"; 
public static final String KEY_COLOR="color"; 
public static final String KEY_TAG="tag"; 
public static final String KEY_FAVOURITE="favourite"; 

public static final String KEY_LOCKSTATUS = "lock_status"; 
public static final String KEY_PASSCODE_ID="passcode_id"; 
public static final String KEY_PASSOCDE = "passcode"; 
public static final String KEY_PASSCODE_STATUS = "passcode_status"; 


private static final String CREATE_TABLE_NOTE="CREATE TABLE " 
     +TABLE_NOTES+"("+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, " 
     +KEY_TITLE+" TEXT, " 
     +KEY_CONTENT+" TEXT, " 
     +KEY_UPDATED_AT+" BIGINT, " 
     +KEY_COLOR+" INT, " 
     +KEY_FAVOURITE+" INT, " 
     +KEY_LOCKSTATUS+" INT"+")"; 

private static final String CREATE_TABLE_PASSCODE="CREATE TABLE IF NOT EXISTS " 
     +TABLE_PASSCODE+"("+KEY_PASSCODE_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, " 
     +KEY_PASSOCDE+" TEXT"+")"; 

public DatabaseHelper(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    this.context = context; 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL(CREATE_TABLE_NOTE); 
    db.execSQL(CREATE_TABLE_PASSCODE); 
} 

public void onDowngrade(SQLiteDatabase paramSQLiteDatabase, int paramInt1, int paramInt2) { 
    onUpgrade(paramSQLiteDatabase, paramInt1, paramInt2); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    if (oldVersion < 3){ 
     db.execSQL("ALTER TABLE notes ADD COLUMN color INT"); 
     db.execSQL("ALTER TABLE notes ADD COLUMN favourite INT"); 
    } 
    if (newVersion > oldVersion){ 
     db.execSQL("ALTER TABLE notes ADD COLUMN lock_status INT"); 
     db.execSQL("CREATE TABLE IF NOT EXISTS " 
       +TABLE_PASSCODE+"("+KEY_PASSCODE_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, " 
       +KEY_PASSOCDE+" TEXT"+")"); 
    } 
}

来源

2016-06-07 Prasad Shirvandkar

问题是，您正在尝试在CREATE TABLE和ALTER TABLE中添加KEY_LOCKSTATUS –

@LucasPaolillo但是，当用户第一次安装应用程序时，它会调用onCreate（），所以所有的列都应该出现它们，但是当用户更新应用程序时，它会调用onUpgrade（）。 –

您的代码。您有一个if语句检查旧版本< 3，然后立即再次检查新版本是否比旧版本更新。当你的版本增加时，第二次检查总是会是真的，所以它总会尝试添加列。

假设你加入4版本，则LOCK_STATUS列一个正确的测试将是

if (oldVersion < 4) { 
    // your code goes here 
}

问题不在于（必须的），你在添加LOCK_STATUS您创建和升级，如在建议评论。如果数据库已经存在，则不会调用create方法。如果数据库尚不存在，则不会调用更新方法。

来源

2016-06-07 16:44:54 Eliodorus

我试着添加如果（oldVersion <4）以前，它不会工作。 –

当您在调试器中进入该代码时，它会向您显示oldVersion和newVersion的内容？ – Eliodorus

我将不得不看到..等待 –

重复的列名lock_status

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