Searching in a Radius using Postgres[Marked]

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Searching in a Radius using Postgres[Marked]

Searching in a Radius using Postgres Creating a GEO application has never been easier. You can have a fully working "What's close to me" in a matter of minutes using some great open-source tools. Postgres has lots of features. With the biggest i…

Discovering the Computer Science Behind Postgres Indexes

This is the last in a series of Postgres posts that Pat Shaughnessy wrote based on his presentation at the Barcelona Ruby Conference. You can also watch the video recording of the presentation. The series was originally published on his personal blog…

Searching External Data in SharePoint 2010 Using Business Connectivity Services

from:http://blogs.msdn.com/b/ericwhite/archive/2010/04/28/searching-external-data-in-sharepoint-2010-using-business-connectivity-services.aspx Business Connectivity Services (BCS) are a set of services and features that provide a way to connect Share…

Postgres全文搜索功能

当构建一个Web应用时,经常被要求加上搜索功能.其实有时候我们也不知道我要搜索个啥,反正就是要有这个功能.搜索确实很重要的特性,这也是为什么像Elasticsearch和Solr这样基于Lucene的数据库越来越流行.这两个是好用,但是在构建Web应用时,有时候感觉像是杀鸡用牛刀.所以我们需要选择轻量好用的东西来搜索. 如何定义足够好用? 足够好用的搜索引擎需要有以下几点特征: Stemming 关键词,词干 Ranking/Boost 排名和权重分配多语言支持错误纠正/模糊查询口音支持…

在ef core中使用postgres数据库的全文检索功能实战

起源之前做的很多项目都使用solr/elasticsearch作为全文检索引擎,它们功能全面而强大,但是对于较小的项目而言,构建和维护成本显然过高,尤其是从关系数据库/文档数据库到全文检索引擎的数据同步工作非常繁琐,且容易出错. 记得很久以前就知道postgresql数据库内置全文检索,最近发现这个数据库越来越火,于是就又研究了一番,欣喜的发现居然支持ef core,于是对其进行了一些研究,并整理心得如下. 前提本文假设读者熟悉entity framework core的基本概念和基本使用.…

mysq l错误Table ‘./mysql/proc’ is marked as crashed and should be repaired

续上一篇,解决了上一篇中的问题后,启动成功,但是在数据库中操作会存在一些问题,一些操作报一下异常: Table './mysql/proc' is marked as crashed and should be repaired 解决方案: repair table mysql.proc;…

postgres创建表的过程以及部分源码分析

背景:修改pg内核,在创建表时,表名不能和当前的用户名同名. 首先我们知道DefineRelation此函数是最终创建表结构的函数,最主要的参数是CreateStmt这个结构,该结构如下 typedef struct CreateStmt { NodeTag type; RangeVar *relation; /* relation to create */ List *tableElts; /* column definitions (list of ColumnDef) */ List *i…