Question

我尝试仅在电话号码（号码）不存在的情况下插入数据库中的某些值（消息正文和日期），但我的代码不起作用。你能提一些建议吗？

    SQLiteDatabase db = this.getWritableDatabase();


    Cursor cursor = db.rawQuery("INSERT INTO version2 (number, body, date) values ("+number+","+body+","+ date+")  SELECT "+number+" WHERE NOT EXISTS "
            + "(SELECT 1 FROM version2 WHERE number = "+number+")", null);

    if (cursor.moveToFirst()) {
        do {

        } while (cursor.moveToNext());

    }
}

Answer 1

尝试此查询。

在插入记录时，似乎您的选择查询不正确。

 INSERT INTO version2 (number, body, date) values ("+number+","+body+","+ date+")  WHERE number IS NOT NULL or number <> '';

Answer 2

您需要创建一个检查重复电话号码的方法。

private boolean isPhoneExists ( long number ) 
{
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery("select phone from version2 where number = " + number, null );

    if (cursor.getCount() > 0)
    return true;
    else
     return false;
}

//现在你的插入声明

 if ( !isPhoneExists ( "987654321" ) )
 {
       Cursor cursor = db.rawQuery("INSERT INTO version2 (number, body, date) values ("+number+","+body+","+ date+")
   .... 
 }

安卓/ SQLite的。使用过滤在数据库中插入多个值？

2 个答案: