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);
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