如何添加WHERE子句来查询的android [英] how to add WHERE clause to Query on android

问题描述

我想限制的结果，那些KEY_HOMEID等于journalId。 我已经在这几天的任何帮助将是AP preciated。

I would like to limit the results to those whose KEY_HOMEID is equal to journalId. I've been on this for a couple days any help would be appreciated.

公开光标fetchAllNotes（字符串journalId） {                  返回mDb.query（DATABASE_TABLE，新的String [] {KEY_ROWID，KEY_HEIGHT，                     KEY_BODY，KEY_HOMEID}，从DATABASE_TABLE WHERE KEY_HOMEID = journalId，NULL，NULL，NULL，NULL，NULL）;         }

public Cursor fetchAllNotes(String journalId) { return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_HEIGHT, KEY_BODY, KEY_HOMEID},"FROM DATABASE_TABLE WHERE KEY_HOMEID = journalId",null, null, null, null,null); }

推荐答案

看一看<一href="http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html#query">http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html#query

您的查询应该看起来有点像这样的：

Your query should look a little like this:

mDb.query(DATABASE_TABLE, // Table name
          columnNames, // String[] containing your column names
          KEY_HOMEID+" = "+jounalId, // your where statement, you do not include the WHERE or the FROM DATABASE_TABLE parts of the query,
          null,
          null,
          null,
          null
         );

如果你感觉更舒服写入SQL查询你也可以使用：

If you feel more comfortable writing sql queries you can also use:

mDb.rawQuery("SQL STATEMENT", null);

这篇关于如何添加WHERE子句来查询的android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！