view

MySQL View containing UNION does not optimize well…In other words SLOW!

由 两盒软妹~` 提交于 2020-02-04 01:08:29
问题 I have a view containing a UNION ALL. For example: CRATE VIEW myView as (SELECT col1, col2, col3 FROM tab1) UNION ALL (SELECT col1, col2, col3 FROM tab2) These are large tables containing 10s of millions of rows each. If I write: SELECT * FROM myView LIMIT 1; instead of being immediate, it basically never returns as do other queries written against this view. If I use the LIMIT in a query against the individual underlying tables, it is immediate. I have indexes on the underlying tables. It

ListView Display and File to Uri

由 为君一笑 提交于 2020-02-01 00:25:56
How can adapter display the content of the listview. 1.AbsListView.java [cpp] view plain copy protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec) { ....... final View child = obtainView(0, mIsScrap); ..... } //one item, called one time. 2.AbsListView.java [java] view plain copy View obtainView( int position, boolean [] isScrap) { .... child = mAdapter.getView(position, scrapView, this ); .... } 3.CursorAdapter.java [java] view plain copy public View getView( int position, View convertView, ViewGroup parent) { ..... if (convertView == null ) { v = newView(mContext, mCursor,

如何实现验证两次输入的密码是否一致

由 我们两清 提交于 2020-01-31 02:48:19
main.xml <?xml version="1.0" encoding="utf-8"?> <TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:stretchColumns="1"> <TableRow android:id="@+id/tableRow1" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/textview_name" android:text="Name:" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <EditText android:id="@+id/edittext_name" android:inputType="textPersonName" android:layout_width="wrap_content" android:layout

How to alter column size of a view in Oracle

由 青春壹個敷衍的年華 提交于 2020-01-30 10:46:29
问题 I am trying to alter the column size of a view with the same command that we use for table like : alter table STUDENT modify ( ROLL_NO VARCHAR2(80) ); But its throwing error SQL Error: ORA-00942: table or view does not exist So how we can alter the column size of a view? 回答1: A view is simply saved query and "inherits" column type from underlying base table. So if you need to change metadata you should alter view definition: ALTER VIEW view_students AS SELECT CAST(roll_no AS VARCHAR2(80)) AS

Why is Oracle SQL Optimizer ignoring index predicate for this view?

由 风格不统一 提交于 2020-01-30 02:00:19
问题 I'm trying to optimize a set of stored procs which are going against many tables including this view. The view is as such: We have TBL_A (id, hist_date, hist_type, other_columns) with two types of rows: hist_type 'O' vs. hist_type 'N'. The view self joins table A to itself and transposes the N rows against the corresponding O rows. If no N row exists for the O row, the O row values are repeated. Like so: CREATE OR REPLACE FORCE VIEW V_A (id, hist_date, hist_type, other_columns_o, other

Navigation Drawer is slow with complex view

由 ぐ巨炮叔叔 提交于 2020-01-29 07:12:44
问题 In my app i'm using Navigation Drawer and it works very fine. But if the Fragment to show contains much TextView, ImageView and Layout, when i click the item, the view is glitching. I would improve this lag. The effect is the same by my Galaxy Nexus and with Nexus 4 so i think the problem is that i have 2 comands in the same time. //On item click - First comand (Close Drawer) mDrawerList.setItemChecked(position, true); setTitle(mStringTitles[position]); mDrawerLayout.closeDrawer(mDrawerView);

Navigation Drawer is slow with complex view

由 可紊 提交于 2020-01-29 07:11:40
问题 In my app i'm using Navigation Drawer and it works very fine. But if the Fragment to show contains much TextView, ImageView and Layout, when i click the item, the view is glitching. I would improve this lag. The effect is the same by my Galaxy Nexus and with Nexus 4 so i think the problem is that i have 2 comands in the same time. //On item click - First comand (Close Drawer) mDrawerList.setItemChecked(position, true); setTitle(mStringTitles[position]); mDrawerLayout.closeDrawer(mDrawerView);

微信小程序-带图列表

由 ≯℡__Kan透↙ 提交于 2020-01-28 23:56:04
index.wxml <!-- 礼品列表 --> <view class='giftListView'> <button class='all'> <!-- cell 1--> <view class='item'> <!-- 产品图片 --> <view class='iconImageView'> <image class='iconImage' src="../../image/vae_tool_logo.jpg" mode='aspectFit'></image> </view> <!-- 产品名称 --> <view class='productView'> <text class='productNameText'>口罩头像生成</text> <text class = 'productDesText'>生成带有口罩的头像 预防新冠肺炎</text> </view> <!-- 具体产品 --> <!-- <view class='productDesView'> </view> --> </view> </button> <button class='all'> <!-- cell 2--> <view class='item'> <!-- 产品图片 --> <view class='iconImageView'> <image class='iconImage'

Android overlay a view ontop of everything?

由 与世无争的帅哥 提交于 2020-01-26 15:22:32
问题 Can you overlay a view on top of everything in android? In iPhone I would get the new view set its frame.origin to (0,0) and its width and height to the width and height of self.view . Adding it to self.view would then cause it to act as an overlay, covering the content behind (or if it had a transparent background then showing the view behind). Is there a similar technique in android? I realise that the views are slightly different (there are three types (or more...) relativelayout,
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