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: cursors
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 […]
SQL-stored procedures, process control, cursors
Stored Procedure Overview of stored procedures 1. Generate background During the development process, we often encounter situations where a certain function is reused. 2.Solution MySQL introduced the technology of stored procedure (Stored Procedure) 3. Stored procedure A stored procedure is a collection of one or more SQL statements Stored procedures can encapsulate a series of […]
MySQL stored procedure using nested cursors
MySQL stored procedure uses nested cursor Introduction to stored procedures A stored procedure is a collection of SQL statements that have been compiled and stored in the database in advance. Calling a stored procedure can simplify application development A lot of work for personnel, reducing the transmission of data between the database and the application […]
MySQL – variables and cursors
Today we come to learn the variables in MySQL (system variables and user variables), and what is a cursor, how to use the cursor? 1. Variables In the stored procedures and functions of the MySQL database, variables can be used to store the intermediate result data of the query or calculation, or to output the […]
[SQL Server] Database Development Guide (8) In-depth study of advanced data processing technology MS-SQL transactions, exceptions and cursors
This series of blog posts is still being updated and is included in the column: #MS-SQL Server column. The list of articles in this series is as follows: [SQL Server] Install, upgrade, rollback, and uninstall SQL Server under Linux operation and maintenance [SQL Server] Database Development Guide (1) Core concepts and basic steps of database […]
Cursors in SQL Server
Cursor concept A cursor is a mechanism that reads one tuple at a time from a collection containing multiple tuples. The cursor is always associated with a SELECT statement, and the result set queried by the SELECT statement is used as a set, and the cursor can read a tuple from the set each time […]
Use of T-SQL cursors
1. Create table INSERT INTO cloud VALUES( ‘You’ ) INSERT INTO cloud VALUES(‘Look at me later’ ) INSERT INTO cloud VALUES(‘Look at the cloud later’ ) INSERT INTO cloud VALUES( ‘I think’ ) INSERT INTO cloud VALUES(‘You are far away when you look at me’ ) INSERT INTO cloud VALUES(‘You are very close when you […]
SQL databases (cursors, condition handlers, stored functions, triggers, storage engines, indexes)
Cursor Cursor is a data type used to store query result sets. In stored procedures and functions, you can use cursors to cycle through result sets. The use of the cursor includes the declaration of the cursor, open, fetch and close A declares the cursor declare cursor name cursor for query statement; B opens the […]