`uuid_generate_v4()` 是一个用于生成 UUID(通用唯一标识符)的函数,通常在 PostgreSQL 数据库中使用。UUID 是一种 128 位的标识符,用于确保在分布式系统中的唯...
突然对于gen_random_uuid() 这个方法比较好奇，他在高并发的情况下是否拥有强一致性的特点（就是保证主...
With Slick 3.1.1, running codegen on the following table: CREATE TABLE applications ( id uuid DEFAULT uuid_generate_v4() NOT NULL, CONSTRAINT applications_pkey PRIMARY KEY (id) ); Gives the following exception and backtrace: java.lang.Il...
I ran this: begin; create extension "uuid-ossp"; create table products (product_id uuid primary key default uuid_generate_v4()); create table orders (order_id uuid primary key default uuid_generate_v4(), product_id uuid references produc...
实际上，这意味着创建扩展需要一次迁移。只有在以后的迁移中，才使用uuid_generate_v4函数创建表。
方案一:安装 uuid-ossp 扩展。 create extension "uuid-ossp" 方案二:在 PostgreSQL 的安装目录的 share/contrib 下面,可以找到 uuid-ossp.sql,执行 psql -d pisces 命令进行安装。 psql -d pisces -U postgres -f D:/Service/PostgreSQL/9.6/share/contrib/uuid-ossp.sql ...
Postgres has support for universally unique identifiers as a column data type viauuid. If you have a UUID column, you may need to generate a UUID. The uuid-ossp module provides a number of functions for generating UUIDs including theuuid_generate_v4()function which bases the UUID entirely of...
SET search_path TO data, public;再次调用扩展语句：create statement if not exists "uuid-ossp"之后...
phpfunctionv4_UUID(){returnsprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',// 32 bits for the time_lowmt_rand(0,0xffff),mt_rand(0,0xffff),// 16 bits for the time_midmt_rand(0,0xffff),// 16 bits for the time_hi,mt_rand(0,0x0fff)|0x4000,// 8 bits and 16 bits for the ...
问函数uuid_generate_v4()不存在postgres 11EN不幸的是，我没有太多关于您的pg-migrate文件的信息，但...