PostgreSQL trigger (function) examples

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PostgreSQL trigger (function) examples

postgres=# \c warehouse_db You are now connected to database "warehouse_db" as user "postgres".warehouse_db=# set search_path ='record';SETwarehouse_db=# show search_path ; search_path ------------- record(1 row) warehouse_db=# create…

ORA-04091: table xxxx is mutating, trigger/function may not see it

今天同事让我看一个触发器为什么老是报错,当执行DML语句触发触发器后,会报ORA-04091错误:ORA-04091: table xxxx is mutating, trigger/function may not see it .对应的中文错误提示为:ORA-04091: 表 xxx发生了变化, 触发器/函数不能读它. 原因分析: [oracle@DB-Server ~]$ oerr ora 409104091, 00000, "table %s.%s is mutating, trigge…

ORA-04091: table is mutating, trigger/function may not see it

今天在论坛里发现了一个关于ORA-04091的老帖子,收获良多,特此整理一下关于ORA-04091: table is mutating, trigger/function may not see it的分析当DML操作触发trigger的时候,如果trigger的程序块中需要对当前表进行修改或查询的时候,就会报错ORA-04091: table is mutating, trigger/function may not see it 这是有在被触发TRIGGER工作的时候,默认把当前表表锁…

ORA-04091: table xxx is mutating, trigger/function may not see it

Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 Connected as tbcs SQL> SQL> SQL> drop trigger tbcs.TRG_CJW_TEST; drop trigger tbcs.TRG_CJW_TEST ORA-04080: trigger 'TRG_CJW_TEST' does not exist SQL> drop table tbcs.cjw_te…

【Azure 应用服务】部署Kafka Trigger Function到Azure Function服务中，解决自定义域名解析难题

问题描述经过前两篇文章,分别使用VM搭建了Kafka服务,创建了Azure Function项目,并且都在本地运行成功. [Azure Developer]在Azure VM (Windows) 中搭建 kafka服务,并且通过本地以及远程验证发送+消费消息 [Azure 应用服务]本地创建Azure Function Kafka Trigger 函数和Kafka output的HTTP Trigger函数实验现在,本文中将把Kafka Trigger Function代码部署到Azur…

PostgreSQL function examples

warehouse_db=# CREATE TABLE warehouse_tbl(warehouse_id INTEGER NOT NULL,warehouse_name TEXT NOT NULL,year_created INTEGER,street_address TEXT,city CHARACTER VARYING(100),state CHARACTER VARYING(2),zip CHARACTER VARYING(10),CONSTRAINT "PRIM_KEY"…

postgresql数据库3种程序（rule,trigger ,FUNCTION ）

1. CREATE [ OR REPLACE ] RULE name AS ON event TO table_name [ WHERE condition ] DO [ ALSO | INSTEAD ] { NOTHING | command | ( command ; command ... ) } 2. CREATE TRIGGER trigger_name [BEFORE|AFTER|INSTEAD OF] event_name ON table_name [ -- Trigger lo…