更新时间:2025-08-19 GMT+08:00
CURSOR
在存储过程中,CURSOR是一种重要资源,不当使用可能引发以下问题:
因此,建议在存储过程中,使用CURSOR后立即关闭。
gaussdb=# create schema best_practices_for_procedure; CREATE SCHEMA gaussdb=# create table best_practices_for_procedure.tb1 (a int); CREATE TABLE gaussdb=# insert into best_practices_for_procedure.tb1 values (1),(2),(3); INSERT 0 3 --创建使用cursor的存储过程。 gaussdb=# create or replace procedure best_practices_for_procedure.pro_cursor () as my_cursor cursor for select *from best_practices_for_procedure.tb1; a int; begin open my_cursor; fetch my_cursor into a; close my_cursor; -- 及时关闭cursor。 end; / CREATE PROCEDURE gaussdb=# call best_practices_for_procedure.pro_cursor(); pro_cursor ------------ (1 row) gaussdb=# drop schema best_practices_for_procedure cascade; NOTICE: drop cascades to 2 other objects DETAIL: drop cascades to table best_practices_for_procedure.tb1 drop cascades to function best_practices_for_procedure.pro_cursor() DROP SCHEMA
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