postgresql | 易学教程

How do I modify a single property value inside the PostgreSQL JSONB datatype?

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问题 How do I modify a single field inside the PostgreSQL JSONB datatype? Let's say I have a table called animal like this: id info ------------------------------------------------------------ 49493 {"habit1":"fly","habit2":"dive","location":"SONOMA NARITE"} I'd like to simply change value(say, to upper case or lower case the text) of the location property. so the result, after UPDATE is id info ------------------------------------------------------------ 49493 {"habit1":"fly","habit2":"dive",

How do I modify a single property value inside the PostgreSQL JSONB datatype?

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docker部署sharding-proxy

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1、背景 Sharding-proxy定位为透明化的数据库代理端，提供封装了数据库二进制协议的服务端版本，用于完成对异构语言的支持。目前先提供PostgreSQL版本，它可以使用任何兼容PostgreSQL协议的访问客户端(如：PostgreSQL Command Client, Navicat等)操作数据，对DBA更加友好。向应用程序完全透明，可直接当做PostgreSQL使用。适用于任何兼容MySQL/PostgreSQL协议的的客户端。 2、安装docker，这一步没什么可讲的 3、制作sharding proxy镜像先制作配置文件：config-sharding.yaml 主要分片所用，文末 schemaName: sharding_db dataSources: ds0: url: jdbc:postgresql: // 127.0.0.1:5432/ds0 username: postgres password: 123456 connectionTimeoutMilliseconds: 30000 idleTimeoutMilliseconds: 60000 maxLifetimeMilliseconds: 1800000 maxPoolSize: 65 ds1: url: jdbc:postgresql: // 127.0.0.1:5432/ds1

correct way to start/stop postgres database pg_ctl or service postgres

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问题 I would like to know correct way of starting/stopping postgres database. There are two ways pg_ctl start/stop service postgresql start/stop I would like to know how they are different from each other, which one should I use? are their any pros/cons. I check online but didnt get satisfactory answer. Thanks in advance 回答1: If you are using Mac with brew To start: brew services start postgresql To stop: brew services stop postgresql Using pg_ctl To start: pg_ctl -D /usr/local/var/postgres -l

Kintex-7 FPGA SFP+光口的10G UDP网络通信开发案例｜基于FPGA的光口通信开发案例

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前言自著名华人物理学家高锟先生提出“光传输理论”，实用化的光纤传输产品始于1976年，经历了PDH→SDH→DWDM→ASON→MSTP的发展历程。本世纪初期，ASON/OADM技术已在通信技术当中广泛应用，逐渐发展成为以骨干网络传输为介质的ROADM技术。图1 光通信技术具有如下特点： (1) 信息容量大。 (2) 损耗低，可长距离传送。 (3) 抗电磁干扰能力强。 (4) 安全性能和保密性好。 (5) 重量轻，体积小，便于施工维护。 (6) 原材料来源丰富潜在价格低廉。得益于以上特点，光通信在软件无线电、视频追踪、光电探测、定位导航、水下通信、电力设备等场合应用十分广泛。而10G光模块经历了从300Pin、XENPAK、X2、XFP的发展，最终实现了用和SFP一样的尺寸传输10G的信号，这就是SFP+。SFP凭借其小型化、低成本等优势满足了设备对光模块高密度的需求，从2002年标准推行到2010年，已经取代XFP成为10G市场主流。创龙科技(Tronlong)的Kintex-7、Zynq-7045/7100等处理板卡已提供2/4通道SFP+光口，可实现UDP或Aurora 10G光口通信。本文将为您分享基于Kintex-7 FPGA SFP+光口的10G UDP网络通信开发案例。如需基于Kinte-7 FPGA或者ZYNQ的Aurora开发案例，欢迎与我们联系。 1

postgresql中的@＞是什么运算符？

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如果在一个数组列中想查询包含有某个字符换的时候就不能用like 了吧？这时候可以使用@> 来查找数组列中某个元素是否包含。当然同样也适用于：范围类型几何类型 JSON类型 select version() PostgreSQL 12.4 CREATE TABLE sor.contacts(id int primary key, name varchar(40),phone varchar(32)[],address text); insert into sor.contacts select seq, seq, array[seq+13600000000, seq+13600000001] from generate_series(1, 500000, 2) as seq; select * from sor.contacts CREATE INDEX idx_contacts_phone on sor.contacts using gin(phone); SELECT * FROM sor.contacts WHERE phone @>array['13600006688'::varchar(32)]; 参考: https://www.postgresql.org/docs/current/functions-json.html 来源： oschina 链接： https

Drop and create ENUM with sequelize correctly?

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问题 How to correctly drop and then recreate ENUM type with sequelize for Postgres in migrations? For example this migration doesn't drop enum_Users_status enum... so any attempts to recreate/change status values after they have been once created fail. module.exports = { up: function (queryInterface, DataTypes) { queryInterface.createTable('Users', { //... status: { type: DataTypes.ENUM, values: [ 'online', 'offline', ], defaultValue: 'online' } //... }) }, down: function (queryInterface) {

Drop and create ENUM with sequelize correctly?

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is primary key automatically indexed in postgresql? [closed]

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问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 months ago . Improve this question I have created table name as d with ID column as primary key and then just inserted records as shown in output, but after fetching all records this output still displayed same as order in which records are inserted. but output as a see now not in ordered form. 回答1: PostgreSQL

is primary key automatically indexed in postgresql? [closed]

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