concat兩列和搜索結果

Question

我想連接sqlite中的兩列並在concat列上執行搜索。這可能嗎？使用SQLite和Android

Cursor mCursor = db.rawQuery(
       "SELECT user_id,firstname,lastname, \"firstname\" || \"lastname\" AS val FROM " 
         + TABLE_DIRECTORY + " where val ='%" + text + "%'", 
       null); 

Answer 1

試試這個

Cursor mCursor = db.rawQuery(
     "SELECT user_id,firstname,lastname, \"firstname\" || \"lastname\" AS val FROM " 
       + TABLE_DIRECTORY + " where \"firstname\" || \"lastname\" LIKE '%" + text + "%'", 
     null); 

Answer 2

我還沒有嘗試過，但只要我還記得，你有你的SQL的錯誤：

Cursor mCursor = db.rawQuery(
     "SELECT user_id,firstname,lastname, \"firstname\" || \"lastname\" AS val FROM " 
       + TABLE_DIRECTORY + " where val LIKE '%" + text + "%'", 
     null); 

使用通配符的文本比較使用LIKE，不=

Answer 3

cursor = db.rawQuery("SELECT _id, firstName, lastName, FROM TABLE_DIRECTORY WHERE firstName || ' ' || lastName LIKE ?", 
        new String[]{"%" + val + "%"});