nspname nspowner nspacl ++ pgtoast 10 pgtemp1 10 pgtoasttemp1 10 pgcatalog 10 {teledbUC/teledb,U/teledb} public 10 {teledbUC/teledb,UC/teledb} informationschema 10 {teledbUC/teledb,U/teledb}

本页介绍天翼云TeleDB数据库创建一个与函数同名的存储过程的错误提示和替换方案。 如创建一个与函数同名的存储过程会提示function xxx already exists with same argument types。 plaintext teledb CREATE OR REPLACE FUNCTION proc1() RETURNS void AS $$ begin raise notice 'Hello teledbpg'; end; $$ LANGUAGE PLPGSQL; CREATE FUNCTION teledb CREATE PROCEDURE proc1() AS $$ begin raise notice 'Hello teledbpg'; end; $$ LANGUAGE PLPGSQL; ERROR: function "proc1" already exists with same argument types teledb 如果要替换，则提示。 plaintext teledb CREATE OR REPLACE PROCEDURE proc1() AS $$ begin raise notice 'Hello teledbpg'; end; $$ LANGUAGE PLPGSQL; ERROR: cannot change routine kind DETAIL: "proc1" is a function. teledb

id nickname + 3 pg

本文为您介绍如何创建分区表。 创建范围分区表 plaintext teledb create table trange (f1 bigint,f2 timestamp default now(), f3 integer) partition by range (f3) begin (1) step (50) partitions (3) distribute by shard(f1); CREATE TABLE teledb insert into trange(f1,f3) values(1,1),(2,50),(3,100),(2,110); COPY 4 teledb insert into trange(f1,f3) values(1,1),(2,50),(3,100),(2,110); COPY 4 teledb d+ trange; Table "public.trange" Column Type Collation Nullable Default Storage Stats target Description +++++++ f1 bigint plain f2 timestamp without time zone now() plain f3 integer plain Distribute By: SHARD(f1) Location Nodes: ALL DATANODES Partition By: RANGE(f3) Of Partitions: 3 Start With: 1 Interval Of Partition: 50 创建时间范围分区表 plaintext teledb create table ttimerange (f1 bigint, f2 timestamp ,f3 bigint) partition by range (f2) begin (timestamp without time zone '20170901 0:0:0') step (interval '1 month') partitions (12) distribute by shard(f1); CREATE TABLE teledb d+ ttimerange Table "public.ttimerange" Column Type Collation Nullable Default Storage Stats target Description +++++++ f1 bigint plain f2 timestamp without time zone plain f3 bigint plain Distribute By: SHARD(f1) Location Nodes: ALL DATANODES Partition By: RANGE(f2)

d dbgbk Did not find any relation named "dbgbk". teledb l+ dbgbk List of databases Name Owner Encoding Collate Ctype Access privileges Size Tablespace Description ++++++++ dbgbk teledb GBK zhCN.gbk zhCN.gbk 19 MB pgdefault (1 row) 指定排序规则 plaintext teledb create database teledbdblccollate lccollate 'C' template template0; CREATE DATABASE 指定分组规则 plaintext teledb create database teledblcctype LCCTYPE 'C' template template0; CREATE DATABASE 配置数据可连接 plaintext teledb create database teledballowconnections ALLOWCONNECTIONS true; CREATE DATABASE teledb select datallowconn from pgdatabase where datname 'teledballowconnections'; datallowconn t (1 row) teledb c teledballowconnections You are now connected to database "teledballowconnections" as user "teledb". 配置连接数 plaintext teledb create database teledbconnlimit CONNECTION LIMIT 100; CREATE DATABASE teledb select datconnlimit from pgdatabase where datname'teledbconnlimit'; datconnlimit 100 (1 row) 配置数据库可以被复制（是否模板数据库） plaintext teledb create database teledbistemplate istemplate true; CREATE DATABASE teledb select datconnlimit from pgdatabase where datname'teledbconnlimit'; datconnlimit 100 (1 row) 多个参数一起配置 plaintext teledb create database teledbmul owner teledbuser CONNECTION LIMIT 50 template template0 encoding 'utf8' lccollate 'C'; CREATE DATABASE

本页介绍天翼云TeleDB数据库修改存储过程所属用户的语法。 修改不带参数的存储过程所属用户 plaintext teledb CREATE OR REPLACE PROCEDURE public.proc1() AS $$ begin raise notice 'Hello teledbpg'; end; $$ LANGUAGE PLPGSQL; CREATE PROCEDURE teledb alter procedure proc1() owner to teledbadmin; ALTER PROCEDURE teledb 修改带参数的存储过程所属用户 plaintext teledb CREATE OR REPLACE PROCEDURE proc1(aint int) AS $$ begin raise notice '%',aint; end; $$ LANGUAGE PLPGSQL; CREATE PROCEDURE teledb alter procedure proc1 (int) owner to teledbadmin; ALTER PROCEDURE teledb

Of Partitions: 12 Start With: 20170901 Interval Of Partition: 1 MONTH 说明 partion by range(xx) 代表范围分区， 支持timesamp,int类型，数据分布于那个子表就是根据这个字段值来计算分区。 begin(xx) 表示开始分区的初始值。 partition(xx) 代表初始分区数量。 step (xx) 代表分区步长。

Schema Name Type Owner +++ public t2 table teledb

create table tnlssort(f1 integer,f2 varchar2(10)); CREATE TABLE teledb insert into tnlssort values(1,'天翼云'); INSERT 0 1 teledb insert into tnlssort values(2,'广州'); INSERT 0 1 teledb insert into tnlssort values(3,'中国'); INSERT 0 1 teledb SELECT FROM tnlssort ORDER BY NLSSORT(f2,'NLSSORT SCHINESEPINYINM'); f1 f2 + 1 天翼云 3 中国 2 广州 (3 rows) teledb 目前TeleDB只能支持按拼音。 nlsupper 将字符转换为大写。 plaintext teledb select NLSUPPER('teledb','nlssort SCHINESEPINYINM') from dual; nlsupper TELEDB (1 row) teledb nchr 给出一个数字代码，返回其对应字符。 plaintext teledb select NCHR(116) from dual; nchr t (1 row) teledb length 获取字符长度。 plaintext teledb select length(1); length 1 (1 row) teledb select length('teledb'); length 7 (1 row) teledb select length('阿弟'); length 2 (1 row) teledb select length(12.12::numeric(10,2)); length 5 (1 row) teledb LENGTHB 返回字符的长度。 plaintext teledb select LENGTHB('测试') from dual; lengthb 6 (1 row) teledb select LENGTH('测试') from dual; length 2 (1 row) teledb

UPDATE ttrigger SET nc'teledbpg' WHERE id1; UPDATE 1 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 (1 row) teledb DELETE事件触发器函数 限制teledbpg记录不能被删除。 plaintext teledb CREATE OR REPLACE FUNCTION ttriggerdeletetriggerfunc() RETURNS trigger AS teledb $$ teledb$ BEGIN teledb$ 不准许ttrigger.nc值为 teledbpg teledb$ IF OLD.nc 'teledbpg' THEN teledb$ RETURN NULL; teledb$ RAISE EXCEPTION 'teledbpg不能被删除'; teledb$ END IF; teledb$ RETURN OLD; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb CREATE TRIGGER ttriggerdeletetrigger BEFORE DELETE ON ttrigger FOR EACH ROW EXECUTE PROCEDURE ttriggerdeletetriggerfunc(); CREATE TRIGGER teledb INSERT INTO ttrigger VALUES(2,'teledbpg'); INSERT 0 1 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 2 teledbpg (2 rows) teledb DELETE FROM ttrigger WHERE id2; DELETE 0 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 2 teledbpg (2 rows) 删除触发器 plaintext teledb drop TRIGGER ttriggerinserttrigger on ttrigger; DROP TRIGGER 触发器使用限制 分区表，冷热分区表和复制表不支持使用触发器。

id fjsonb + 1 {"col1": 1, "col2": "teledb"} 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 3 {"col1": 1, "col2": "pgxz"}

本页介绍天翼云TeleDB数据库的游标使用方法。 环境准备 plaintext drop table if exists bills ; create table bills ( id serial not null, goodsdesc text not null, beginunit text not null, begincity text not null, pubtime timestamp not null, amount float8 not null default 0, primary key (id) ) distribute by shard(id) to group defaultgroup; COMMENT ON TABLE bills is '运单记录'; COMMENT ON COLUMN bills.id IS 'id号'; COMMENT ON COLUMN bills.goodsdesc IS '货物名称'; COMMENT ON COLUMN bills.beginunit IS '启运省份'; COMMENT ON COLUMN bills.begincity IS '启运城市'; COMMENT ON COLUMN bills.pubtime IS '发布时间'; COMMENT ON COLUMN bills.amount IS '运费'; INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'衣服','海南省','三亚市','20151005 09:32:01',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'建筑设备','福建省','三明市','20151005 07:21:22',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'设备','福建省','三明市','20151005 11:21:54',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'普货','福建省','三明市','20151005 15:19:17',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'5 0铲车，后八轮翻斗车','河南省','三门峡市','20151005 07:53:13',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'鲜香菇2000斤','河南省','三门峡市','20151005 10:38:29',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'旋挖附件38吨','河南省','三门峡市','20151005 10:48:38',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'旋挖附件35吨','河南省','三门峡市','20151005 10:48:38',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'旋挖附件39吨','河南省','三门峡市','20151005 11:38:38',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'设备','上海市','上海市','20151005 07:59:35',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'普货40吨需13米半挂一辆','上海市','上海市','20151005 08:13:59',ROUND((random()10000)::NUMERIC,2));

dep product sum ++ 业务1部 电脑 80 业务1部 手机 160 业务1部 240 业务2部 电脑 120 业务2部 手机 50 业务2部 170 业务3部 电脑 80 业务3部 手机 160 业务3部 240 650

id nickname + 1 hello teledb 2 random value

id name age ++ 3 teledb

本文介绍天翼云TeleDB数据库json应用。 创建json 类型字段表 plaintext teledb create table tjson(id int,fjson json); CREATE TABLE 插入数据 plaintext teledb insert into tjson values(1,'{"col1":1,"col2":"teledb"}'); INSERT 0 1 teledb insert into tjson values(2,'{"col1":1,"col2":"teledb","col3":"pgxz"}'); INSERT 0 1 teledb select from tjson; id fjson + 1 {"col1":1,"col2":"teledb"} 2 {"col1":1,"col2":"teledb","col3":"pgxz"} (2 rows) 通过键获得json对象域 plaintext teledb select fjson >'col2' as col2 ,fjson > 'col3' as col3 from tjson; col2 col3 + "teledb" "teledb" "pgxz" (2 rows) 以文本形式获取对象值 plaintext teledb select fjson >>'col2' as col2 ,fjson >> 'col3' as col3 from tjson; col2 col3 + teledb teledb pgxz (2 rows) teledb select fjson >>'col2' as col2 ,fjson >> 'col3' as col3 from tjson where fjson >> 'col3' is not null; col2 col3 + teledb pgxz (1 row)

truncate ttimerange partition for ('20170901' ::timestamp without time zone); TRUNCATE TABLE teledb select from ttimerange; f1 f2 f3 ++ 1 20171001 00:00:00 100 1 20171101 00:00:00 100 (2 rows) truncate 一个数字分区表 plaintext teledb select from trange; f1 f2 f3 ++ 1 20230823 10:29:46.263768 1 2 20230823 10:29:46.263768 50 2 20230823 10:29:46.263768 110 3 20230823 10:29:46.263768 100 (4 rows) teledb d+ trange Table "public.trange" Column Type Collation Nullable Default Storage Stats target Description +++++++ f1 bigint plain f2 timestamp without time zone now() plain f3 integer plain Distribute By: SHARD(f1) Location Nodes: ALL DATANODES Partition By: RANGE(f3) Of Partitions: 3 Start With: 1 Interval Of Partition: 50 teledb truncate trange partition for (1); TRUNCATE TABLE teledb truncate trange partition for (2); TRUNCATE TABLE teledb select from trange; f1 f2 f3 ++ 2 20230823 10:29:46.263768 110 3 20230823 10:29:46.263768 100 (2 rows)

本文为您介绍如何在使用SELECT语法时添加where条件。 单条件查询 plaintext teledb select from teledbpg where id 1; id nickname + 1 teledb 1 hello,pgxc (2 rows) 多条件and plaintext teledb select from teledbpg where id 1 and nickname like '%h%' ; id nickname + 1 hello,pgxc (1 row) 多条件or plaintext teledb select from teledbpg where id 1 or nickname like '%p%' ; id nickname + 1 teledb 1 hello,pgxc 3 pg (3 rows) ilike 不区分大小写匹配 plaintext teledb insert into teledbpg values(2,'TELEDB'); INSERT 0 1 teledb select from teledbpg where nickname ilike '%te%'; id nickname + 1 teledb 2 TELEDB (2 rows) where 条件也能支持子查询 plaintext teledb select from teledbpg where id(select (random())::integer from teledbpg order by random() limit 1); id nickname + (0 rows) teledb select from teledbpg where id(select (random())::integer from teledbpg order by random() limit 1); id nickname + 1 teledb 1 hello,pgxc (2 rows) null 值查询方法 plaintext teledb select from teledbpg where nickname is null; id nickname + 4 (1 row) teledb select from teledbpg where nickname is not null; id nickname + 1 teledb 3 pg 1 hello,pgxc 2 TELEDB (4 rows) exists 只要有记录返回就为真 plaintext teledb

explain select from tmulidx where f11 or f22 or f33 ; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn001, dn002 > Seq Scan on tmulidx (cost0.00..12966.87 rows3 width16) Filter: ((f1 1) OR (f2 2) OR (f3 3)) (4 rows) Time: 3.153 ms 如果返回字段全部在索引文件中，则只需要扫描索引，IO 开销会更少。 plaintext teledb explain select f1,f2,f3 from tmulidx where f11 ; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01 > Index Only Scan using tmulidxidx on tmulidx (cost0.42..8.44 rows1 width12) Index Cond: (f1 1) (4 rows) Time: 2.630 ms 更新性能比单字段多索引文件要好 多字段 plaintext teledb truncate table tmulidx; TRUNCATE TABLE Time: 44.930 ms teledb insert into tmulidx select t,t,t,t from generateseries(1,1000000) as t; INSERT 0 1000000 Time: 1985.901 ms (00:01.986) 单字段 plaintext teledb create table tsimpleidx (f1 int,f2 int,f3 int,f4 int); CREATE TABLE teledb create index tsimpleidxidx on tsimpleidx(f1); CREATE INDEX teledb create index tsimpleidxidx1 on tsimpleidx(f2); CREATE INDEX teledb create index tsimpleidxidx2 on tsimpleidx(f3); CREATE INDEX teledb

id fjson + 1 {"col1":1,"col2":"teledb"} 2 {"col1":1,"col2":"teledb","col3":"pgxz"}

本页介绍天翼云TeleDB数据库存储过程执行的语法。 不带参数 plaintext teledb create or replace procedure pnopara() as $$ begin raise notice 'nopara procedure'; end; $$ language plpgsql; CREATE PROCEDURE teledb call pnopara(); NOTICE: nopara procedure CALL teledb 带参数 plaintext teledb create or replace procedure ppara(aint integer) as $$ begin raise notice 'aint %',aint; end; $$ language plpgsql; CREATE PROCEDURE teledb call ppara(1); NOTICE: aint 1 CALL teledb

id mc + 1 teledb 2 ctyun

UPDATE ttrigger SET nc'teledbpg' WHERE id1; UPDATE 1 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 (1 row) teledb DELETE事件触发器函数 限制teledbpg记录不能被删除。 plaintext teledb CREATE OR REPLACE FUNCTION ttriggerdeletetriggerfunc() RETURNS trigger AS teledb $$ teledb$ BEGIN teledb$ 不准许ttrigger.nc值为 teledbpg teledb$ IF OLD.nc 'teledbpg' THEN teledb$ RETURN NULL; teledb$ RAISE EXCEPTION 'teledbpg不能被删除'; teledb$ END IF; teledb$ RETURN OLD; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb CREATE TRIGGER ttriggerdeletetrigger BEFORE DELETE ON ttrigger FOR EACH ROW EXECUTE PROCEDURE ttriggerdeletetriggerfunc(); CREATE TRIGGER teledb INSERT INTO ttrigger VALUES(2,'teledbpg'); INSERT 0 1 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 2 teledbpg (2 rows) teledb DELETE FROM ttrigger WHERE id2; DELETE 0 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 2 teledbpg (2 rows) 删除触发器 plaintext teledb drop TRIGGER ttriggerinserttrigger on ttrigger; DROP TRIGGER 触发器使用限制 分区表，冷热分区表和复制表不支持使用触发器。

本页介绍天翼云TeleDB数据库修改存储过程所属用户的语法。 修改不带参数的存储过程所属用户 plaintext teledb CREATE OR REPLACE PROCEDURE public.proc1() AS $$ begin raise notice 'Hello teledbpg'; end; $$ LANGUAGE PLPGSQL; CREATE PROCEDURE teledb alter procedure proc1() owner to teledbadmin; ALTER PROCEDURE teledb 修改带参数的存储过程所属用户 plaintext teledb CREATE OR REPLACE PROCEDURE proc1(aint int) AS $$ begin raise notice '%',aint; end; $$ LANGUAGE PLPGSQL; CREATE PROCEDURE teledb alter procedure proc1 (int) owner to teledbadmin; ALTER PROCEDURE teledb

rowid f1 f2 ++ XPK3fwAQAAAAAAAAA 1 1

本页介绍天翼云TeleDB数据库Oracle语法中的系统函数。 extract plaintext extract(xmltype类型,节点)。 create table xmlexample(ID varchar(100),name varchar(20),data xmltype); insert into xmlexample(id,name,data) values('xxxxxxxxxxxxxxx','my document',' nam022^^^450 抗震救灾 奥运会 经济学 计算机 10001 20050709 计算机 笔记本 '::xmltype); teledb select id,name, extract(x.data,'/collection/record/datafield/subfield') as A from xmlexample x; id name a ++ xxxxxxxxxxxxxxx my document 抗震救灾 奥运会 经济学 计算机 10001 20050709 计算机 笔记本 (1 row)

本页介绍天翼云TeleDB数据库Oracle兼容语法的数据类型。 varchar2 plaintext teledb create table tvarchar2(f1 varchar2,f2 int); CREATE TABLE teledb d+ tvarchar2 Table "public.tvarchar2" Column Type Collation Nullable Default Storage Stats target Description +++++++ f1 varchar2 extended f2 integer plain Distribute By: SHARD(f1) Location Nodes: ALL DATANODES teledb number plaintext teledb create table tnumber(f1 number,f2 number(10),f3 number(10,2)); CREATE TABLE teledb d tnumber Table "public.tnumber" Column Type Collation Nullable Default ++++ f1 numeric f2 numeric(10,0) f3 numeric(10,2) 系统转换成numeric。 blob plaintext teledb create table tblob(f1 int,f2 Blob); CREATE TABLE teledb d tblob Table "public.tblob" Column Type Collation Nullable Default ++++ f1 integer f2 blob Teledb的blob类型支持最大长度为1G。 clob plaintext teledb create table tclob(f1 int,f2 clob); CREATE TABLE teledb d tclob Table "public.tclob" Column Type Collation Nullable Default ++++ f1 integer f2 clob TeleDB的clob类型支持最大长度为1G。

本页介绍天翼云TeleDB数据库的Oracle GUC参数配置。 session中生效 plaintext SET enableoraclecompatible to ON; 配置某个库默认生效 plaintext alter database teledb set enableoraclecompatible to on; 配置某个用户默认生效 plaintext alter role admin set enableoraclecompatible to on;

本页介绍天翼云TeleDB数据库PL/pgsql控制结构中的其他控制语句。 动态执行 plaintext teledb CREATE OR REPLACE FUNCTION f27(aid INTEGER) RETURNS text AS teledb $$ teledb$ DECLARE teledb$ vsql TEXT; teledb$ vmc TEXT; teledb$ BEGIN teledb$ vsql : 'SELECT mc FROM t WHERE id'aid::TEXT; teledb$ EXECUTE vsql INTO vmc; teledb$ RETURN vmc; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(1); f27 teledbpg (1 row) 动态执行就是拼SQL语句，然后使用EXECUTE命令执行。 执行一个没有结果的命令 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS void AS teledb $$ teledb$ BEGIN teledb$ perform f27(1); teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(); f27 (1 row) teledb 获取执行结果 plaintext teledb DROP FUNCTION f27(INTEGER); DROP FUNCTION teledb CREATE OR REPLACE FUNCTION f27(aid INTEGER) RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vmc TEXT; teledb$ BEGIN teledb$ SELECT mc INTO vmc FROM t WHERE idaid; teledb$ IF FOUND THEN teledb$ RAISE NOTICE '查询到记录，值为%',vmc; teledb$ ELSE teledb$ RAISE NOTICE '查不到记录' ; teledb$ END IF; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb

本页介绍天翼云TeleDB数据库PL/pgsql控制结构中的判断语句。 IF...THEN...END IF plaintext teledb CREATE OR REPLACE FUNCTION f26() RETURNS VOID AS teledb $$ teledb$ BEGIN teledb$ IF random()>0.5 THEN teledb$ RAISE NOTICE '随机数大于0.5'; teledb$ END IF; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb select f26(); NOTICE: 随机数大于0.5 f26 (1 row) teledb IF...THEN...ELSE...END IF plaintext teledb CREATE OR REPLACE FUNCTION f26() RETURNS VOID AS teledb $$ teledb$ BEGIN teledb$ IF random()>0.99 THEN teledb$ RAISE NOTICE '随机数大于0.99'; teledb$ ELSE teledb$ RAISE NOTICE '随机数小于或等于0.99'; teledb$ END IF; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb select f26(); NOTICE: 随机数小于或等于0.99 f26 (1 row) teledb IF...THEN...ELSIF...THEN...ELSE...END IF plaintext teledb CREATE OR REPLACE FUNCTION f26() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vfloat8 float8 : random(); teledb$ BEGIN teledb$ IF vfloat8>0.99 THEN teledb$ RAISE NOTICE '随机数大于0.99'; teledb$ ELSIF vfloat8>0.5 THEN teledb$ RAISE NOTICE '随机数大于0.50'; teledb$

本页介绍天翼云TeleDB数据库PL/pgsql控制结构中的循环语句。 LOOP 循环 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vid INTEGER : 1; teledb$ BEGIN teledb$ LOOP teledb$ RAISE NOTICE '%',vid; teledb$ EXIT WHEN random()>0.8; teledb$ vid : vid + 1; teledb$ END LOOP ; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(); NOTICE: 1 NOTICE: 2 f27 (1 row) 使用EXIT退出循环。 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vid INTEGER : 1; teledb$ vrandom float8 ; teledb$ BEGIN teledb$ LOOP teledb$ RAISE NOTICE '%',vid; teledb$ vid : vid + 1; teledb$ vrandom : random(); teledb$ IF vrandom > 0.8 THEN teledb$ RETURN; teledb$ END IF; teledb$ END LOOP ; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(); NOTICE: 1 NOTICE: 2 NOTICE: 3 NOTICE: 4 NOTICE: 5 f27 (1 row) teledb 使用RETURN退出循环返回。 WHILE循环 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vid INTEGER : 1; teledb$

END; teledb$ $$ teledb LANGUAGE PLPGSQL; CREATE FUNCTION teledb SELECT FROM f18(); id mc + 1 teledb 2 abcd (2 rows) teledb d t1 Table "public.t1" Column Type Collation Nullable Default ++++ id integer not null yhm text nc text mm character varying teledb CREATE OR REPLACE FUNCTION f19() RETURNS SETOF public.trec AS teledb $$ teledb$ DECLARE teledb$ 使用已经定义的结构类型返回 teledb$ vrec public.trec; teledb$ BEGIN teledb$ FOR vrec IN SELECT id,yhm FROM t1 ORDER BY id LOOP teledb$ RETURN NEXT vrec; teledb$ END LOOP; teledb$ RETURN ;最后的RETURN可以加，也可以不加上去 teledb$ END; teledb$ $$ teledb LANGUAGE PLPGSQL; CREATE FUNCTION teledb SELECT FROM f19(); id mc + 1 teledb 2 teledb1 (2 rows) teledb CREATE OR REPLACE FUNCTION f20(aint integer) RETURNS SETOF record AS teledb $$ teledb$ DECLARE teledb$ aint定义返回的字段数，实现动态列返回 teledb$ vrec record; teledb$ vsql text; teledb$ BEGIN teledb$ IF aint 2 THEN teledb$ vsql:'SELECT id,yhm FROM t1 ORDER BY id '; teledb$ ELSE teledb$ vsql:'SELECT id,yhm,nc FROM t1 ORDER BY id'; teledb$ END IF; teledb$ FOR vrec IN EXECUTE vsql LOOP teledb$