postgreSQL 使用笔记（本人公司用的是arterydb,分装的postgreSQL）

--启动数据库

./bin/aty_ctl -D data -l arterydb.log start

--连接数据库

./bin/atysql -d artery

--设置环境变量

export LD_LIBRARY_PATH='/home/arterydb/lib'

--删除表

DROP TABLE table_name;

--查询表是否存在

select count(*) into FYDM from information_schema.tables where table_schema='db_fy' and table_type='BASE TABLE' and table_name='t_aydm_map';

--创建函数

CREATE OR REPLACE FUNCTION Juge_Delete_table() RETURNS void AS

$$

DECLARE

FYDM INT;

begin

select count(*) into FYDM from information_schema.tables where table_schema='db_fy' and table_type='BASE TABLE' and table_name='t_aydm_map';

if FYDM>0 then

drop table db_fy.t_aydm_map;

end if;

end

$$

language platysql;

--调用函数

select Juge_Delete_table();

--查询索引

select count(*) from aty_indexes where indexname = 'i_jg_fy'; --查询条件必须小写

--创建角色及权限

CREATE ROLE admin WITH CREATEDB CREATEROLE;

--更改密码

ALTER ROLE davide WITH PASSWORD 'hu8jmn3';

此部分详见公司内网（http://172.16.6.233/ArteryDB/sql-createrole.html）

--创建索引

create index I_JG_FY on DB_FY.T_JG (N_FY);

--删除索引

drop index db_fy.i_jg_fy;(索引是对应的,创建db_fy下的索引,对应删除要删shcame"db_fy"下的索引;不指定schame则删除也不用指定)

--查找表数量

select count(*) from aty_tables where schemaname like '%imdb%';

sybase->arterydb类型转换

binary->bytea

image->bytea

tinyint->smallint

datetime->timestamp

执行sql文件

./bin/atysql -h localhost -d artery -U arterydb -f

/home/shsql/ods2etl/D_MSAJLX_ZH.txt;

bytea类型插入图片

创建存储过程

create or replace function bytea_import(p_path text, p_result out bytea)as

$$

declare

l_oid oid;

r record;

begin

p_result := '';

select lo_import(p_path) into l_oid;

for r in ( select data

from aty_largeobject

where loid = l_oid

order by pageno ) loop

p_result = p_result || r.data;

end loop;

perform lo_unlink(l_oid);

end

$$

language platysql;

执行插入语句

insert into db_fy.aaa(a) select bytea_import('/home/arterydb/untitled.png');

查找固定表在哪个字段

SELECT

c.relname,

col_description (a.attrelid, a.attnum) AS COMMENT,

format_type (a.atttypid, a.atttypmod) AS TYPE,

a.attname AS NAME,

a.attnotnull AS notnull

FROM

aty_class AS c,

aty_attribute AS a

WHERE a.attrelid = c.oid

AND a.attnum > 0

AND a.attname = 'n_ajbs'

查看表结构

SELECT

attname,typname,adsrc

FROM

aty_attribute

INNER JOIN aty_class ON aty_attribute.attrelid = aty_class.oid

INNER JOIN aty_type ON aty_attribute.atttypid = aty_type.oid

LEFT OUTER JOIN aty_attrdef ON aty_attrdef.adrelid = aty_class.oid AND aty_attrdef.adnum = aty_attribute.attnum

LEFT OUTER JOIN aty_description ON aty_description.objoid = aty_class.oid AND aty_description.objsubid = aty_attribute.attnum

WHERE

aty_attribute.attnum > 0

AND attisdropped <> 't'

AND aty_class.relname= 't_aydm' --t_aydm为表名

ORDER BY aty_attribute.attnum ;

查看当前数据库连接数

SELECT aty_stat_get_backend_pid(s.backendid) AS procpid,

aty_stat_get_backend_activity(s.backendid) AS current_query

FROM (SELECT aty_stat_get_backend_idset() AS backendid) AS s;

数字转字符串

select to_char(1252323, '9999999999999');

select to_char(current_timestamp, 'YY-MM-DD HH12:MI:SS');

arterydb重启数据库

设置环境变量

export ATYDATA="/home/arterydb/data"

重启