postgresql cursor example

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1. The following Code creates a top100cur () function, which returns an anonymous cursor. -- Drop function top100cur (); Create Function top100cur () returns refcursor as $ declare ABC refcursor; beginopen ABC for select * From person limit 100;

PostgreSQL 9.5.1 official document Study Notes This document is applicable to the latest version of PostgreSQL 9.5.1. I am new to PostgreSQL and may not miss this article. please correct me. With more understanding, this article [may] will be

1. The following Code creates a top100cur () function, which returns an anonymous cursor -- dropfunctiontop100cur (); createfunctiontop10 1. The following Code creates a top100cur () function, which returns an anonymous cursor -- drop function top10

Install PostgreSQL 9.6 For example:?InstallationInstall the repository RPMYum Install https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-7-x86_64/pgdg-redhat96-9.6-3.noarch.rpmInstall the client PackagesYum Install postgresql96Install the

All messages sent by the PostgreSQL server are given a five-character error code that follows the custom of the SQL "SQLSTATE" code. Apps that need to know what error conditions are occurring should usually test the error code instead of the text

Python uses the psycopg2 module to operate PostgreSQL, psycopg2postgresql In fact, there are many modules in Python that can be used to connect to PostgreSQL. Here we recommend psycopg2. Psycopg2 is very easy to install (pip install psycopg2). Here

It is not difficult to realize that the core content of the optimized statement execution is the processing of various scheduling nodes from the optimized statements described earlier, and because of the design of node representation, recursive

-- Drop function top100cur (refcursor); Create Function top100cur (refcursor) returns refcursor as $ beginopen $1 for select * From person limit 100; return $1; end $ language plpgsql; ---------- test cursor ----------- select top100cur ('abc'); --

People who are used to C ++ development may prefer to use the c ++ library to access PostgreSQL. Libpqxx was launched a long time ago. It is now in version 4.0. This article briefly introduces People who are used to C ++ development may prefer to