Table of Contents Oracle Database—-Seventh Week Experiment Loops and cursors Oracle Database—-Seventh Week Experiment Loops and Cursors Loops and Cursors ? Loop ? First set the display output results Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 Connected as system@ORCL SQL> set serveroutput on; 1. Simple loop Example 9-11. Use a simple loop to […]
Tag: cursor
QChat realizes cursor movement + controllable cross cursor length
This is achieved by rewriting QChartView and inheriting the mousePressEvent and mouseMoveEvent functions to control the cursor length; The environment used is QT5.14.2, and the package used is: MSVC2017 64bit, win10 system; Above code: //Chart display close to label callout.h #ifndef CALLOUT_H #define CALLOUT_H #include <QtCharts/QChartGlobal> #include <QtWidgets/QGraphicsItem> #include <QtGui/QFont> #include <QDebug> QT_BEGIN_NAMESPACE class QGraphicsSceneMouseEvent; […]
Get SQLite data (basic cursor)
A SQLite helper was created for Starbuzz in the previous section. Currently, data is still obtained from the Java Drink class. At this time, the application needs to be modified to obtain data from the SQLite database. All codes for this article are stored in https://github.com/MADMAX110/Starbuzz 1. Modify DrinkActivity to use Starbuzz database Basic steps: […]
Kingbase ES cursor cross-transaction and its case
Foreword This article introduces the cross-transaction use cases of cursors in PLSQL and SQL layers, and a case study. Verified version of this article: db0=# select version(); db0-# / version —————————————- KingbaseES V008R006C007B0024 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28), 64-bit (1 row) One, a cursor in a PLSQL block spans […]
[Database] Sql Server 2022 obtains target data through logical processing through temporary tables and cursor traversal
2023, Week 39. Give yourself a goal, and then stick to it and you will always get something. If you don’t believe me, try it! Today, a friend asked me about a problem with Sql Server data processing. I just wanted to review the knowledge about Sql Server temporary tables and cursors. Directory 1. Description […]
Mysql storage-variables, functions, cursors, judgments, loops
Stored procedure (procedure) 1 Introduction: A stored procedure is a collection of SQL statements that have been compiled in advance and stored in the database. Calling a stored procedure can reduce the transmission of data between the database and the application server, which is beneficial to improving the efficiency of data processing. The concept of […]
How to use SQL Server cursors [Transfer]
Original text excerpted from: http://www.cnblogs.com/moss_tan_jun/archive/2011/11/26/2263988.html Cursors are evil! In relational databases, our thinking about queries is set-oriented. The cursor breaks this rule. The cursor makes our way of thinking change to line by line. For C-like developers, this way of thinking will be more comfortable. The normal way of thinking about collections is: And for […]
Usage scenarios of JDBC connection parameter useCursorFetch
There are many JDBC connection parameters, and some settings can play an auxiliary role in supporting the application’s processing logic. This article from the technical community “Original | Analysis of JDBC and MySQL Temporary Table Space” explains the useCursorFetch parameter, which is worth learning. Learn from. Background The application JDBC connection parameter uses useCursorFetch=true, and […]
Python test development django-rest-framework-87. Pagination query offset pagination (LimitOffsetPagination) and cursor pagination (CursorPagination)…
Foreword The django-rest-framework paginator provides 3 paging methods. The previous article introduced simple paging (PageNumberPagination). This article continues to introduce the other two paging offset paging (LimitOffsetPagination) and cursor paging (CursorPagination) Offset Pagination (LimitOffsetPagination) LimitOffsetPagination is offset paging. When querying, the url address carries two parameters, limit and offset, in the following format http://localhost:8000/api/v1/goods?limit=100 & […]
Kingbase ES cursor cross-transaction and its case
Foreword This article introduces the cross-transaction use cases of cursors in PLSQL and SQL layers, and a case study. Verified version of this article: db0=# select version(); db0-#/ version —————————————- KingbaseES V008R006C007B0024 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28), 64-bit (1 row) One, a cursor in a PLSQL block spans transactions […]