删除android中的查询不识别列名

时间:2014-05-28 05:53:02

标签: android sqlite

我无法弄清楚为什么删除查询无法识别该列。我尝试了各种方法,但是当代码运行时,我不断收到错误:

  

" ...没有这样的专栏:expense.expId"

表已经创建,我可以向他们添加数据,相关代码将被发布:

这些字符串在类DbHelper

中定义
public static final String TABLE_EXPENSE="expense";
public static final String EXPENSE_ID="expId";
public static final String EXPENSE_AMT="amt";
public static final String EXPENSE_DATE="edate";

创建表

    public static void createExp(DbHelper dbh,SQLiteDatabase db){
    String code="create table "+dbh.TABLE_EXPENSE+"("
        +dbh.EXPENSE_ID+" integer primary key autoincrement,"
        +dbh.EXPENSE_AMT+" double,"
        +dbh.EXPENSE_DATE+" TIMESTAMP DEFAULT CURRENT_TIMESTAMP);";
    db.execSQL(code);
}

查询版本1:

    db.delete("expense","expId="+i,null);

版本2:

    public static void deleteExp(DbHelper dbh,SQLiteDatabase db,int i){

    String code="delete from "+dbh.TABLE_EXPENSE+" where "+dbh.EXPENSE_ID+"="+i+";";
    db.rawQuery(code,null);
}

版本3:

    public static void deleteExp(DbHelper dbh,SQLiteDatabase db,int i){

    String code="delete from expense where expId="+i+";";
    db.rawQuery(code,null);
}

所有这些都产生了上面提到的相同错误

0 个答案:

没有答案