postgresql cursor

Oracle uses a cursor to add a primary key statement to all user tables. oracle cursor Application Scenario: adding an auto-increment primary key to a data table can speed up data table access, and is the fastest in integer indexing. This program is suitable for running when the Oracle database is imported and the primary key does not exist. Code Description: All table primary key field names are set to ID.

Oracle uses a cursor to delete all record scripts in all user data tables. oracle cursor Application Scenario: because the data in the database involves confidential information, we hope to delete all the data at a time and only keep the data table structure for the development of new projects. Test Result: All data has been deleted. Problem: if the data table has a foreign key, the following script may fai

Cursor note Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Declare @ TMP Varchar ( 15 ) -- Define Variables Declare Cursor_data Cursor For Select Rulenumber From Rules -- Standing cursor Open Cursor_data -- Enable

Tags: BEGIN DECLARE ID long; DECLARE done INT DEFAULT 0; DECLARE cashamount DECIMAL (10,2) DEFAULT 0.00; DECLARE Scorecamount INT DEFAULT 0; DECLARE userids CURSOR for SELECT userid from info_user where isreal = 1; DECLARE CONTINUE HANDLER for SQLSTATE ' 02000 ' SET done = 1; OPEN UserIDs; REPEAT FETCH userids into ID; DELETE from Info_black WHERE userid=id; DELETE from Info_consignee WHERE userid=id; SET Cashamount = (

Recently, when writing a Snake game, you need to use the cursor to locate the game. Method 1: 1 # Include 2 # Include 3 4 Handle Hout = Getstdhandle (std_output_handle ); 5 Coord; 6 Void Locate ( Int X, Int Y) 7 { 8 Coord. x = X; 9 Coord. Y = Y; 10 Setconsolecursorposition (Hout, coord ); 11 12 }; 13 14 Int Main () 15 16 { 17 Locate ( 2 , 2 ); 18 Printf ( " Hello world \ n "); 19 Return 0 ; 20 }

[Oracle] Chapter 5 cursor and trigger, Chapter 5 oracle cursor Chapter 5 cursor and trigger Cursor: Implicit cursor: % FOUND, % NOTFOUND, % ROWCOUNT 1.% FOUND usage. The % FOUND attribute returns TRUE only when the DML statement affects one or more rows. The following exampl

I. Introduction of VIMVim is a powerful text editor, the upgrade version of VI, with color display, the default has three modes: General mode, command mode, edit modeInstall Vim[Email protected] ~]# VIM/ETC/PASSWD-bash:vim: Command not found[Email protected] ~]#[email protected] ~]# Yum install-y vim-enhanced...second, color display, Move Cursor[[email protected] ~]# VIM/ETC/PASSWD under etc will display color according to different files,[[email pro

MySQL tutorial cursor cursor definition DECLARE cursor_name cursor for select_statement; Cursor operations Open cursor OPEN cursor_name; Fetch gets the record of the cursor's current pointer and passes it to the specified list of variables, noting that the number of var

In the case of manual installation (for the case where the source code is compiled for PG or the decompressed version is installed for PG), PG does not start automatically when it is started, and stops automatically when it is turned off, as a DBA, this is obviously unacceptable. 1. Self-starting services in Windows In Windows, you can use the pg_ctl command to generate the postgresql service and enable it to start itself. In fact, the installation v

Understanding cursors (1): An Overview of cursors eygle says that database activities are mainly about the importance of the cursors active cursors. As a result, I have made a series of articles, step-by-Step learning of cursors the first article is an overview. First, let's get A general idea: ① define www.2cto.com official definition: a cursor is a handle or name for A private SQL area that is: A cursor i