postgresql

Get created table name

由 五迷三道 提交于 2021-02-09 04:17:58
问题 I'm trying to create a event trigger , executed whenever a table is created . When this happens I would like to insert into a table ( which has 2 columns id and tablename ) the name of the table created. Reading the docs I'm not able to find how can i get the table name. So far I have this: CREATE OR REPLACE FUNCTION insert_layer() RETURNS event_trigger AS $$ DECLARE r RECORD; BEGIN RAISE NOTICE 'event for % ', tg_tag; -- I would like to execute this --EXECUTE format('INSERT INTO "public

STM32（2）——GPIO

由 て烟熏妆下的殇ゞ 提交于 2021-02-09 03:36:05
对于初学者而言，最简单的是对芯片上的IO进行操作，我们学习ARM时候，第一个工程就是点亮LED，STM32F103ZET6通用输入输出接口 (General-Purpose Inputs/Outputs)，每个GPIO都可以由软件配置成输出（推免或开漏）、输入（带或不带上拉或下拉）或复用的外设功能端口。多数 GPIO引脚都与数字或模拟的复用外设共用。具体的细节请参考 Datasheet。 回到 MDK开发平台，现在要在 main.c中加入相关代码了。代码清单如下： #include "stm32f10x_lib.h" int main() { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOB, ENABLE); //开启外设时钟 GPIOD->CRL = 0x33333333; //设置端口配置寄存器 GPIOB->CRL = 0x33333333; while(1) { GPIOD->ODR = 0xffffffbf; //设置端口输出寄存器 for(i=0;i<1000000;i++); //延时 GPIOD->ODR = 0xffffffff7; for(i=0;i<1000000;i++); GPIOD->ODR = 0x00000000; GPIOB->ODR = 0xffffffff;

Knative 入门系列7：实战演练

由 ⅰ亾dé卋堺 提交于 2021-02-08 21:57:00
作者：Brian McClain & Bryan Friedman 译者：张晓鹏 审校：孙海洲、邱世达、宋净超 Knative 是一个基于 Kubernetes 的，用于构建、部署和管理现代 serverless 应用的平台。Getting Started with Knative 是一本由 Pivotal 公司赞助 O’Reilly 出品的电子书，公众号后台回复“ knative ”获取英文版下载地址。本书中文版由 ServiceMesher 社区自发翻译系列文章，这是该系列的第7章。 让我们把我们所学的一切运用起来去创造一些东西吧！我们进行一个演练，它利用了您前面所学到的许多知识，并通过使用美国地质勘探局 (USGS) 地震数据源的数据提供了一个服务，以可视化地展示世界各地的地震活动。您可以在 GitHub 存储库 gswk/earthquakedemo 中找到我们将要介绍的代码。 架构 在深入研究代码之前，让我们先看看应用程序的体系架构，如 图7-1 所示。我们在这里构建三个重要的东西:事件源、服务和前端。 图中 Knative 内部的每一个组件都代表着我们将利用目前所学的知识来构建的内容，包括使用 Kaniko 构建模板的服务和用于轮询数据的自定义事件源: USGS 事件源 我们将构建一个自定义的 ContainerSource 事件源，它将在给定的时间间隔轮询 USGS

To drop an index with psycopg2 takes effect before or after commit?

由 浪子不回头ぞ 提交于 2021-02-08 20:54:14
问题 I'm doing a python script to insert several data into a postgresql database. Following the postgresql documentation in order to speed up the load process my script has this sort of structure Connect to the database and create a cursor Drop all the indexes Load all the data using the 'copy' command Recreate back all the indexes Commit and close of the cursor and connection (only commit in the whole script) So my question is: Is dropping the indexes before the commit, taking any effect in terms

Why does null||null return a null value but concat(null,null) returns an empty string in postgres?

由 本秂侑毒 提交于 2021-02-08 19:51:50
问题 I'm trying to understand the differences between concat() and || in postgres when using nulls. Why does concat() return an empty string if both sides of the concat are null? Take this query For Example: SELECT concat(NULL,NULL) AS null_concat, NULL||NULL AS null_pipes, concat(NULL,NULL) IS NULL is_concat_null, NULL||NULL IS NULL is_pipe_null will return: I understand that concat() ignores nulls but if all the values in the concat are null, wouldn't the expected result be a null? Is this

Why does null||null return a null value but concat(null,null) returns an empty string in postgres?

由 邮差的信 提交于 2021-02-08 19:51:41
问题 I'm trying to understand the differences between concat() and || in postgres when using nulls. Why does concat() return an empty string if both sides of the concat are null? Take this query For Example: SELECT concat(NULL,NULL) AS null_concat, NULL||NULL AS null_pipes, concat(NULL,NULL) IS NULL is_concat_null, NULL||NULL IS NULL is_pipe_null will return: I understand that concat() ignores nulls but if all the values in the concat are null, wouldn't the expected result be a null? Is this

Change IdentityServer4 Entity Framework table names

由 痞子三分冷 提交于 2021-02-08 18:49:39
问题 I am trying to change the default table names created by the PersistedGrantDb and ConfigurationDb for IdentityServer4 and have Entity Framework generate the correct SQL. For example; instead of the using the entity IdentityServer4.EntityFramework.Entities.ApiResource using the table ApiResources , I want the data to be mapped into a table named mytesttable According to the documentation this should be as simple as adding ToTable invocations for each entity that I want to remap in the

Change IdentityServer4 Entity Framework table names

由 走远了吗. 提交于 2021-02-08 18:46:01
问题 I am trying to change the default table names created by the PersistedGrantDb and ConfigurationDb for IdentityServer4 and have Entity Framework generate the correct SQL. For example; instead of the using the entity IdentityServer4.EntityFramework.Entities.ApiResource using the table ApiResources , I want the data to be mapped into a table named mytesttable According to the documentation this should be as simple as adding ToTable invocations for each entity that I want to remap in the

Change IdentityServer4 Entity Framework table names

由 蓝咒 提交于 2021-02-08 18:40:22
问题 I am trying to change the default table names created by the PersistedGrantDb and ConfigurationDb for IdentityServer4 and have Entity Framework generate the correct SQL. For example; instead of the using the entity IdentityServer4.EntityFramework.Entities.ApiResource using the table ApiResources , I want the data to be mapped into a table named mytesttable According to the documentation this should be as simple as adding ToTable invocations for each entity that I want to remap in the

Change IdentityServer4 Entity Framework table names

由 ∥☆過路亽．° 提交于 2021-02-08 18:37:27
问题 I am trying to change the default table names created by the PersistedGrantDb and ConfigurationDb for IdentityServer4 and have Entity Framework generate the correct SQL. For example; instead of the using the entity IdentityServer4.EntityFramework.Entities.ApiResource using the table ApiResources , I want the data to be mapped into a table named mytesttable According to the documentation this should be as simple as adding ToTable invocations for each entity that I want to remap in the
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