PostgreSQL是和Oracle最接近的企业数据库，包括数据类型，功能，架构和语法等几个方面。甚至大多数的日常应用的性能也不会输给Oracle。
但是Oracle有些函数或者包，默认PostgreSQL是没有的，需要安装orafce包来实现这些兼容性。
例如现在orafce已经包含了如下内容。
1. 类型 date, varchar2 and nvarchar2
2. 函数 concat, nvl, nvl2, lnnvl, decode, bitand, nanvl, sinh, cosh, tanh and oracle.substr
3. dual 表
4. package :
dbms_output
utl_file
dbms_pipe
dbms_alert
PLVdate
PLVstr and PLVchr
PLVsubst
DBMS_utility
PLVlex
DBMS_ASSERT
PLUnit
DBMS_random
orafce的安装步骤如下：
http://pgxn.org/dist/orafce/
下载最新版本。
wget http://api.pgxn.org/dist/orafce/3.1.2/orafce-3.1.2.zip
安装
unzip orafce-3.1.2.zip
mv orafce-3.1.2 /opt/soft_bak/postgresql-9.4.5/contrib
cd /opt/soft_bak/postgresql-9.4.5/contrib/orafce-3.1.2
把pg_config命令放到当前路径，之后就可以编译安装。
export PATH=/opt/pgsql/bin:$PATH
make clean
make
make install
创建extension 。
su - postgres
psql
postgres=# create extension orafce;
CREATE EXTENSION
Oracle兼容 函数列表：
postgres=# \df
List of functions
Schema | Name | Result data type | Argument data types | Type
--------+---------------------+-----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------
public | bitand | bigint | bigint, bigint | normal
public | cosh | double precision | double precision | normal
public | decode | bigint | anyelement, anyelement, bigint | normal
public | decode | bigint | anyelement, anyelement, bigint, anyelement, bigint | normal
public | decode | bigint | anyelement, anyelement, bigint, anyelement, bigint, anyelement, bigint | normal
public | decode | bigint | anyelement, anyelement, bigint, anyelement, bigint, anyelement, bigint, bigint | normal
public | decode | bigint | anyelement, anyelement, bigint, anyelement, bigint, bigint | normal
public | decode | bigint | anyelement, anyelement, bigint, bigint | normal
public | decode | character | anyelement, anyelement, character | normal
public | decode | character | anyelement, anyelement, character, anyelement, character | normal
public | decode | character | anyelement, anyelement, character, anyelement, character, anyelement, character | normal
public | decode | character | anyelement, anyelement, character, anyelement, character, anyelement, character, character | normal
public | decode | character | anyelement, anyelement, character, anyelement, character, character | normal
public | decode | character | anyelement, anyelement, character, character | normal
public | decode | date | anyelement, anyelement, date | normal
public | decode | date | anyelement, anyelement, date, anyelement, date | normal
public | decode | date | anyelement, anyelement, date, anyelement, date, anyelement, date | normal
public | decode | date | anyelement, anyelement, date, anyelement, date, anyelement, date, date | normal
public | decode | date | anyelement, anyelement, date, anyelement, date, date | normal
public | decode | date | anyelement, anyelement, date, date | normal
public | decode | integer | anyelement, anyelement, integer | normal
public | decode | integer | anyelement, anyelement, integer, anyelement, integer | normal
public | decode | integer | anyelement, anyelement, integer, anyelement, integer, anyelement, integer | normal
public | decode | integer | anyelement, anyelement, integer, anyelement, integer, anyelement, integer, integer | normal
public | decode | integer | anyelement, anyelement, integer, anyelement, integer, integer | normal
public | decode | integer | anyelement, anyelement, integer, integer | normal
public | decode | numeric | anyelement, anyelement, numeric | normal
public | decode | numeric | anyelement, anyelement, numeric, anyelement, numeric | normal
public | decode | numeric | anyelement, anyelement, numeric, anyelement, numeric, anyelement, numeric | normal
public | decode | numeric | anyelement, anyelement, numeric, anyelement, numeric, anyelement, numeric, numeric | normal
public | decode | numeric | anyelement, anyelement, numeric, anyelement, numeric, numeric | normal
public | decode | numeric | anyelement, anyelement, numeric, numeric | normal
public | decode | text | anyelement, anyelement, text | normal
public | decode | text | anyelement, anyelement, text, anyelement, text | normal
public | decode | text | anyelement, anyelement, text, anyelement, text, anyelement, text | normal
public | decode | text | anyelement, anyelement, text, anyelement, text, anyelement, text, text | normal
public | decode | text | anyelement, anyelement, text, anyelement, text, text | normal
public | decode | text | anyelement, anyelement, text, text | normal
public | decode | time without time zone | anyelement, anyelement, time without time zone | normal
public | decode | time without time zone | anyelement, anyelement, time without time zone, anyelement, time without time zone | normal
public | decode | time without time zone | anyelement, anyelement, time without time zone, anyelement, time without time zone, anyelement, time without time zone | normal
public | decode | time without time zone | anyelement, anyelement, time without time zone, anyelement, time without time zone, anyelement, time without time zone, time without time zone | normal
public | decode | time without time zone | anyelement, anyelement, time without time zone, anyelement, time without time zone, time without time zone | normal
public | decode | time without time zone | anyelement, anyelement, time without time zone, time without time zone | normal
public | decode | timestamp with time zone | anyelement, anyelement, timestamp with time zone | normal
public | decode | timestamp with time zone | anyelement, anyelement, timestamp with time zone, anyelement, timestamp with time zone | normal
public | decode | timestamp with time zone | anyelement, anyelement, timestamp with time zone, anyelement, timestamp with time zone, anyelement, timestamp with time zone | normal
public | decode | timestamp with time zone | anyelement, anyelement, timestamp with time zone, anyelement, timestamp with time zone, anyelement, timestamp with time zone, timestamp with time zone | normal
public | decode | timestamp with time zone | anyelement, anyelement, timestamp with time zone, anyelement, timestamp with time zone, timestamp with time zone | normal
public | decode | timestamp with time zone | anyelement, anyelement, timestamp with time zone, timestamp with time zone | normal
public | decode | timestamp without time zone | anyelement, anyelement, timestamp without time zone | normal
public | decode | timestamp without time zone | anyelement, anyelement, timestamp without time zone, anyelement, timestamp without time zone | normal
public | decode | timestamp without time zone | anyelement, anyelement, timestamp without time zone, anyelement, timestamp without time zone, anyelement, timestamp without time zone | normal
public | decode | timestamp without time zone | anyelement, anyelement, timestamp without time zone, anyelement, timestamp without time zone, anyelement, timestamp without time zone, timestamp without time zone | normal
public | decode | timestamp without time zone | anyelement, anyelement, timestamp without time zone, anyelement, timestamp without time zone, timestamp without time zone | normal
public | decode | timestamp without time zone | anyelement, anyelement, timestamp without time zone, timestamp without time zone | normal
public | dump | character varying | "any" | normal
public | dump | character varying | "any", integer | normal
public | dump | character varying | text | normal
public | dump | character varying | text, integer | normal
public | nanvl | double precision | double precision, character varying | normal
public | nanvl | double precision | double precision, double precision | normal
public | nanvl | numeric | numeric, character varying | normal
public | nanvl | numeric | numeric, numeric | normal
public | nanvl | real | real, character varying | normal
public | nanvl | real | real, real | normal
public | nvarchar2 | nvarchar2 | nvarchar2, integer, boolean | normal
public | nvarchar2_transform | internal | internal | normal
public | nvarchar2in | nvarchar2 | cstring, oid, integer | normal
public | nvarchar2out | cstring | nvarchar2 | normal
public | nvarchar2recv | nvarchar2 | internal, oid, integer | normal
public | nvarchar2send | bytea | nvarchar2 | normal
public | nvarchar2typmodin | integer | cstring[] | normal
public | nvarchar2typmodout | cstring | integer | normal
public | nvl | anyelement | anyelement, anyelement | normal
public | nvl2 | anyelement | anyelement, anyelement, anyelement | normal
public | sinh | double precision | double precision | normal
public | tanh | double precision | double precision | normal
public | to_multi_byte | text | str text | normal
public | to_single_byte | text | str text | normal
public | varchar2 | varchar2 | varchar2, integer, boolean | normal
public | varchar2_transform | internal | internal | normal
public | varchar2in | varchar2 | cstring, oid, integer | normal
public | varchar2out | cstring | varchar2 | normal
public | varchar2recv | varchar2 | internal, oid, integer | normal
public | varchar2send | bytea | varchar2 | normal
public | varchar2typmodin | integer | cstring[] | normal
public | varchar2typmodout | cstring | integer | normal
(88 rows)
Oracle兼容 dual表，在PG里用了一个视图来实现。
postgres=# \dv
List of relations
Schema | Name | Type | Owner
--------+------+------+----------
public | dual | view | postgres
(1 row)
postgres=# \d+ dual
View "public.dual"
Column | Type | Modifiers | Storage | Description
--------+-------------------+-----------+----------+-------------
dummy | character varying | | extended |
View definition:
SELECT 'X'::character varying AS dummy;
postgres=# select * from dual;
dummy
-------
X
(1 row)
postgres=# select 1 from dual;
?column?
----------
1
(1 row)
Oracle兼容 包列表：
在PostgreSQL里用schema+函数来实现。
postgres=# \dn
List of schemas
Name | Owner
--------------+----------
dbms_alert | postgres
dbms_assert | postgres
dbms_output | postgres
dbms_pipe | postgres
dbms_random | postgres
dbms_utility | postgres
madlib | postgres
oracle | postgres
plunit | postgres
plvchr | postgres
plvdate | postgres
plvlex | postgres
plvstr | postgres
plvsubst | postgres
public | postgres
utl_file | postgres
(16 rows)
例如dbms_alert包:
postgres=# \df dbms_alert.*
List of functions
Schema | Name | Result data type | Argument data types | Type
------------+----------------+------------------+-------------------------------------------------------------------------------+---------
dbms_alert | _signal | void | name text, message text | normal
dbms_alert | defered_signal | trigger | | trigger
dbms_alert | register | void | name text | normal
dbms_alert | remove | void | name text | normal
dbms_alert | removeall | void | | normal
dbms_alert | set_defaults | void | sensitivity double precision | normal
dbms_alert | signal | void | _event text, _message text | normal
dbms_alert | waitany | record | OUT name text, OUT message text, OUT status integer, timeout double precision | normal
dbms_alert | waitone | record | name text, OUT message text, OUT status integer, timeout double precision | normal
(9 rows)
PostgreSQL Oracle 兼容性系列之 - orafce
2015-12-21
6880
版权
版权声明：
本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《
阿里云开发者社区用户服务协议》和
《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写
侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。
本文涉及的产品
简介：
相关实践学习
阿里云数据库产品家族及特性
阿里云智能数据库产品团队一直致力于不断健全产品体系，提升产品性能，打磨产品功能，从而帮助客户实现更加极致的弹性能力、具备更强的扩展能力、并利用云设施进一步降低企业成本。以云原生+分布式为核心技术抓手，打造以自研的在线事务型(OLTP)数据库Polar DB和在线分析型(OLAP)数据库Analytic DB为代表的新一代企业级云原生数据库产品体系， 结合NoSQL数据库、数据库生态工具、云原生智能化数据库管控平台，为阿里巴巴经济体以及各个行业的企业客户和开发者提供从公共云到混合云再到私有云的完整解决方案，提供基于云基础设施进行数据从处理、到存储、再到计算与分析的一体化解决方案。本节课带你了解阿里云数据库产品家族及特性。
目录
相关文章
|
7月前
|
关系型数据库
分布式数据库
数据库
PolarDB PostgreSQL版：Oracle兼容的高性能数据库
PolarDB PostgreSQL版是一款高性能的数据库，具有与Oracle兼容的特性。它采用了分布式架构，可以轻松处理大量的数据，同时还支持多种数据类型和函数，具有高可用性和可扩展性。它还提供了丰富的管理工具和性能优化功能，为企业提供了可靠的数据存储和处理解决方案。PolarDB PostgreSQL版在数据库领域具有很高的竞争力，可以满足各种企业的需求。
511
0
0
|
3月前
|
Oracle
NoSQL
关系型数据库
|
7月前
|
人工智能
Oracle
关系型数据库
|
7月前
|
SQL
Oracle
关系型数据库
常用数据库的分页语句(mySQL、oracle、PostgreSQL、SQL Server)
常用数据库的分页语句(mySQL、oracle、PostgreSQL、SQL Server)
51
0
0
|
SQL
Oracle
关系型数据库
|
7月前
|
存储
Oracle
关系型数据库
PolarDB 开源版通过orafce支持Oracle兼容性
背景PolarDB 的云原生存算分离架构, 具备低廉的数据存储、高效扩展弹性、高速多机并行计算能力、高速数据搜索和处理; PolarDB与计算算法结合, 将实现双剑合璧, 推动业务数据的价值产出, 将数据变成生产力.本文将介绍PolarDB开源版通过orafce支持Oracle兼容性 .测试环境为m...
137
0
0
|
SQL
Cloud Native
关系型数据库
ADBPG（AnalyticDB for PostgreSQL）是阿里云提供的一种云原生的大数据分析型数据库
ADBPG（AnalyticDB for PostgreSQL）是阿里云提供的一种云原生的大数据分析型数据库
1294
1
1
|
数据可视化
关系型数据库
MySQL
|
SQL
存储
自然语言处理
玩转阿里云RDS PostgreSQL数据库通过pg_jieba插件进行分词
在当今社交媒体的时代，人们通过各种平台分享自己的生活、观点和情感。然而，对于平台管理员和品牌经营者来说，了解用户的情感和意见变得至关重要。为了帮助他们更好地了解用户的情感倾向，我们可以使用PostgreSQL中的pg_jieba插件对这些发帖进行分词和情感分析，来构建一个社交媒体情感分析系统，系统将根据用户的发帖内容，自动判断其情感倾向是积极、消极还是中性，并将结果存储在数据库中。
677
1
1
|
弹性计算
安全
Cloud Native
热门文章
最新文章
1
什么场景应该用 MongoDB ？
2
PostgreSQL 如何实现批量更新、删除、插入
3
PostgreSQL upsert功能(insert on conflict do)的用法
4
Linux 性能诊断 perf使用指南
5
PostgreSQL 9种索引的原理和应用场景
6
PostgreSQL 如何潇洒的处理每天上百TB的数据增量
7
Jedis常见异常汇总
8
PostgreSQL 百亿数据 秒级响应 正则及模糊查询
9
时序数据库分析 - TimescaleDB时序数据库介绍
10
MongoDB 存储引擎 WiredTiger 原理解析
1
卓越效能，极简运维，体验Serverless高可用架构，完成任务可领取转轮日历！
19
2
数据库数据恢复—ORACLE常见故障的数据恢复方案
24
3
【赵渝强老师】PostgreSQL的控制文件
40
4
PolarDB 分布式版 V2.0，安全可靠的集中分布式一体化数据库管理软件
46
5
数据库数据恢复—MYSQL数据库文件损坏的数据恢复案例
22
6
MySQL常见函数第二期，你都用过哪些呢 ？
38
7
MySQL进阶突击系列(02)一条更新SQL执行过程 | 讲透undoLog、redoLog、binLog日志三宝
35
8
【赵渝强老师】PostgreSQL的服务器日志文件
28
9
MySQL常见函数第一期，你都用过哪些呢 ？
39
10
【赵渝强老师】PostgreSQL的WAL预写日志文件
24