[英]SQLite exception column does not exist
我正在尝试编写一个简单的应用程序,以仅计算使用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,第一个是“日期”,第二个是一个计数器。 现在,使用我的数据库管理器类,我创建一个方法插入到表中。
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,它给我一个错误,提示“ cigcount”列不存在。 这是目录消息:
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 (?,?)
谁能帮助我解决这个问题?
有一个逗号,
你列规范之间的丢失:
private static final String CREATE_DB = "create table " + TABLE_NAME + " ( " + COLUMN_DATE + " text "
+ COLUMN_CIGCOUNT + " integer );";
应该
private static final String CREATE_DB = "create table " + TABLE_NAME + " ( " + COLUMN_DATE + " text, "
+ COLUMN_CIGCOUNT + " integer );";
修复它后,请卸载您的应用程序,以便删除旧的数据库文件。 (您的onUpgrade()
也存在语法错误,仅递增版本将无法更新架构。)
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