Question

我正在尝试编写一个简单的应用程序来计算我使用SQLite按下按钮的次数。只有一个表有两列。我有如下实现的SQLiteOpenHelper：

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class SqliteHelperInstance extends SQLiteOpenHelper {

public static final String DATABASE_NAME = "app_stats";
public static final String TABLE_NAME = "day_stats";
public static final String COLUMN_DATE = "date";
public static final String COLUMN_CIGCOUNT = "cigcount";
public static final int DATABASE_VERSION = 1;

private static final String CREATE_DB = "create table " + TABLE_NAME + " ( " +  COLUMN_DATE + " text "
+ COLUMN_CIGCOUNT + " integer );";

public SqliteHelperInstance(Context context){
    super(context,DATABASE_NAME , null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(CREATE_DB);

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
    db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME);
    onCreate(db);
}

}

所以我有一个有两列的表首先是“日期”，接下来是一个计数器。现在使用我的数据库管理器类，我创建了一个插入表格的方法。

public class DbManager {

private SqliteHelperInstance sqlHelper;
private SQLiteDatabase database;
    public DbManager(Context context){
    sqlHelper = new SqliteHelperInstance(context);
}
    public void open() throws SQLException{
    database = sqlHelper.getWritableDatabase();
}
    public void addEntry(String dateEntry){
            DbEntry newEntry = new DbEntry();
            newEntry.setDate(dateEntry);
            newEntry.setCounter(0);
    values.put(SqliteHelperInstance.COLUMN_DATE, dateEntry);
    values.put(SqliteHelperInstance.COLUMN_CIGCOUNT, newEntry.getCigNum());
    database.insert(SqliteHelperInstance.TABLE_NAME, null, values);
    }
}

但是当我运行我的应用程序时，它给出了一个错误，即“cigcount”列不存在。这是catlog消息：

05-08 16:23:15.830: E/SQLiteLog(1076): (1) table day_stats has no column named cigcount
05-08 16:23:15.850: E/SQLiteDatabase(1076): Error inserting cigcount=0 date=2014-05-08
05-08 16:23:15.850: E/SQLiteDatabase(1076): android.database.sqlite.SQLiteException: table day_stats has no column named cigcount (code 1): , while compiling: INSERT INTO day_stats(cigcount,date) VALUES (?,?)

任何人都可以帮我解决这个问题吗？

Answer 1

您的列规范之间缺少逗号,：

private static final String CREATE_DB = "create table " + TABLE_NAME + " ( " +  COLUMN_DATE + " text "
+ COLUMN_CIGCOUNT + " integer );";

应该是

private static final String CREATE_DB = "create table " + TABLE_NAME + " ( " +  COLUMN_DATE + " text, "
+ COLUMN_CIGCOUNT + " integer );";

修复后，卸载您的应用，以便删除旧的数据库文件。（您的onUpgrade()中也存在语法错误，单独递增版本无法更新架构。）

SQLite异常列不存在

1 个答案: