CREATE FUNCTION defines a new function. CREATE OR REPLACE FUNCTION will either create a new function, or replace an existing definition. To be able to define a function, the user must have the USAGE privilege on the language. If a schema name is...
*/FUNC_PARAM_IN ='i',/* input only */FUNC_PARAM_OUT ='o',/* output only */FUNC_PARAM_INOUT ='b',/* both */FUNC_PARAM_VARIADIC ='v',/* variadic (always input) */FUNC_PARAM_TABLE ='t'/* table function output column */} FunctionParameterMode;typedefstructFunctionParameter{ Node...
The first line uses PostgreSQL'sCREATE OR REPLACE FUNCTIONstatement to create the function. The name of the function isfib. TheCREATE OR REPLACE FUNCTIONstatement is more useful in practice than the simpleCREATE FUNCTIONstatement, because it will drop an existing function with the same name and a...
\echo Use "CRAETE EXTENSION test_tabble" to load this file. \quit CREATE TABLE pg_invoke(para1 float4,para12 float4, ret float);/* 创建一个表格 */ CREATE FUNCTION pgEuropean(float4,float4)/* 创建一个函数 */ RETURNS float4 AS 'MODULE_PATHNAME' , 'pgEuropean' LANGUAGE C STRICT PARA...
The first line uses PostgreSQL's CREATE OR REPLACE FUNCTION statement to create the function. The name of the function is fib. The CREATE OR REPLACE FUNCTION statement is more useful in practice than the simple CREATE FUNCTION statement...
createorreplacefunctionauditlogfunc()returnstriggeras$example_table$begininsertintoaudit(emp_id,entry_date)values(new.id,current_timestamp);returnnew;end$example_table$languageplpgsql; (3)创建触发器函数 create trigger example_trigger after insertoncompanyforeach row executeprocedureauditlogfunc(); ...
postgres=# create extension pginvoke;CREATE EXTENSION 4.再次查看已安装模块 已经创建成功。 5.查看函数创建脚本 postgres=# \sffunctionname is required postgres=# \sf pgEuropean CREATE OR REPLACE FUNCTION public.pgeuropean(real,real)RETURNS real ...
CREATE FUNCTION instr(varchar, integer) RETURNS integer AS $$ DECLARE v_string ALIAS FOR $1; index ALIAS FOR $2; BEGIN -- some computations using v_string and index here END; $$ LANGUAGE plpgsql; CREATE FUNCTION concat_selected_fields(in_t sometablename) RETURNS text AS $$ BEGIN RETURN...
declare begin NEW.id := NEW.id+1; raise notice '%, id:%', TG_NAME, NEW.id; -- 修改NEW.id , 并返回修改后的NEW. 影响插入数据的并不是NEW变量本身, 而是return的值, 这个在后面将会有例子举证. return NEW; end; language plpgsql; CREATE FUNCTION – 创建触发器 postgres=# create trigger ...
postgres=# create database test;CREATEDATABASEpostgres=# alter database testsettablespace mytbs;ALTERDATABASEpostgres=# \c test You are now connected to database"test"asuser"postgres".test=# create tabletb_mytps(i int,namevarchar(32))tablespace mytbs;CREATETABLE ...