postgresql cursor

An Oracle cursor is divided into a display cursor and an implicit cursor. Display cursor (Explicit Cursor): A cursor defined in a PL/SQL program, used for querying, is called a display cursor.Implicit cursors (implicit

Reference one, explicit cursorExplicit is relative to the implicit cursor, there is a clear statement of the cursor. The declaration of an explicit cursor resembles the following (verbose syntax participates in Plsql ref doc):Cursor cursor_name (parameter list) is select ...Cursors are a complete life journey from decl

I recently handled some memory leaks in my work. In this process, I found some basic problems, instead of causing memory leaks, such as static variables, cursor shutdown, threads, timer, anti-Registration, bitmap, etc. I have made some statistics and summarized. Of course, these problems are more general. Next I will take some instances based on the problem.CodePaste it out and analyze it step by step. In specific scenarios, use an effective method to

CURSOR is also called a CURSOR. It is often used in relational databases. In PLSQL programs, you can use CURSOR and SELECT to query and read data in tables or views row by row. CURSOR is also called a CURSOR. It is often used in relational databases. In PL/SQL programs, you

A SQL Server cursor usesThe use of the/*** cursor speaks to the advantages of this multi-cursor, and now we are personally unveiling the mysterious veil of the cursor. The order in which cursors are used: reputation cursors, open cursors, read data, close cursors, delete cursors.1.3.1 declaring the cursor's simplest

The Linux release version is Ubuntu server 6.06, And the Ubuntu version is only 8.1. To be an early adopter, 8.2.0 has improved the compatibility based on the Windows platform to facilitate the conversion of the platform. At the same time, you can customize some parameters and settings for source code installation. Although Ubuntu has good usability and compatibility, and some features are newer, it is somewhat similar to Windows, the reduction also closes a lot of details, so developers do not

The PL/SQL cursor allows the program to select multiple rows of data from the database, and then separately process each row of data, it provides Oracle with a method to indicate and control each stage of SQL processing. I think you have some knowledge about PL/SQL. Through this article, you will learn: Creation of cursor Processing the cursor Define and us

/* Cursor */　　-- A cursor is actually a mechanism that can extract a record from a result set that contains multiple data records.　　/* The Role Of The cursor */-- Allows specific rows in the result set to be located.-- Retrieve one or more rows of data from the current location of the result set.-- The row at the current position in the result set can be modified

The Oracle display cursor is a SELECT clause clearly defined in the Declaration unit, and a name is specified to reference the cursor attribute using this name. The Oracle display cursor is a SELECT clause clearly defined in the Declaration unit, and a name is specified to reference the cursor attribute using this name

PostgreSQL is an object-relational database (database management system) based on the BSD license. Because of the flexibility of the license, anyone can use, modify, and distribute PostgreSQL for free for any purpose. Simply put, even if you take it to change it, and then take it out and sell it, no one will be in control. Therefore, a lot of domestic database is based on

Tags: http io ar os using SP for strong filesWindows under PostgreSQL installation diagram This article is mainly for you to introduce the method of installing PostgreSQL database under Windows, you need a friend can refer to the following Now talk about the free database, most people think of the first may be MySQL, indeed MySQL has been used in many areas of the country, especially the site. However, th

First, we will introduce the basic knowledge of downstream targets: During database development, when the data you retrieve is only one record, the transaction statement code you write usually uses the select insert statement. However, we often encounter this situation, that is, reading a record from a result set one by one. How can this problem be solved? Cursors provide us with an excellent solution. 1.1 advantages of cursors and cursors In databases, cur