执行器投影算子入口函数，可以看到关键函数是ExecEvalExprSwitchContext，在PG中和表达式求值有关的逻辑都通过这个函数实现。#ifndef FRONTENDstaticinline TupleTableSlot *ExecProject(ProjectionInfo *projInfo){ ExprState *state = &projInfo->pi_state; TupleTableSlot *slot = state->resultslot; // 投影之后的结...
this is the recommended way to install PostgreSQL, since it provides proper integration with the operating system, including automatic patching and other management functionality. In other cases, most Linux systems also make it easy to build from source. PostgreSQL可以在大多数Linux平台上...
staticinlineint32rand_int_internal(intmin,intmax){returnrand()%(max-min+1)+min;}PG_FUNCTION_INFO_V1(rows_int);Datumrows_int(PG_FUNCTION_ARGS){Assert(fcinfo->nargs==1||fcinfo->nargs==3);FuncCallContext*funcctx;int32times=PG_GETARG_INT32(0);// 第一次调用SRF函数时的初始化if(SRF_IS...
万事开头难,搭建好一套学习、开发PostgreSQL的环境,是重中之重。 因为其他平台(Ubuntu, CentOS, MAC)的用户大多数都具备了自行安装数据库的能力,在这里我只写一个面向Windows用户的学习环境搭建文档。 分为三个部分,用户可以自由选择。 如果你想深入的学习PostgreSQL,建议搭建PostgreSQL on Linux的环境。如果你只是想...
[root@web1 postgresql-10.5]# rpm -aq ncurses* readline* zlib* readline-devel-6.2-10.el7.x86_64 zlib-static-1.2.7-18.el7.x86_64 ncurses-libs-5.9-14.20130511.el7_4.x86_64 ncurses-devel-5.9-14.20130511.el7_4.x86_64 readline-static-6.2-10.el7.x86_64 zlib-devel-1.2.7-18.el7.x86_64 ...
build_subplan(root, plan, subroot, plan_params, ANY_SUBLINK,0, newtestexpr,false,true));/* Check we got what we expected */Assert(hashplan->parParam == NIL); Assert(hashplan->useHashTable);/* build_subplan won't have filled in paramIds */hashplan->paramIds = paramIds;/* Leave...
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package org.example; // 导入 JDBC 和 IO 包 import java.io.FileInputStream; import java.io.IOException; import java.sql.*; import java.util.Properties; import java.sql.Timestamp; public class PostgreSQLInsert { public static void main(String[] args ) { String url = null; String user = ...
Build Date : Wed 17 Apr 2019 04:12:41 AM UTC Build Host : koji-centos7-x86-64-pgbuild Relocations : (not relocatable) Vendor : PostgreSQL Global Development Group URL : https://yum.postgresql.org Summary : PostgreSQL PGDG RPMs- Yum Repository Configuration for Red Hat / CentOS / Scienti...
);//先用DI容器生成 serviceProvider, 然后通过 serviceProvider 获取Main Form的注册实例varserviceProvider =services.BuildServiceProvider();//主动从容器中获取FormMain实例, 这是简洁写法varformMain = serviceProvider.GetRequiredService<Form1>(); Application.Run(formMain); ...