Stored procedures in PostgreSQL

select 存储过程，在现了解的情况，还是没有mysql,sqlserver等好写好用。

--postgreSQL 11.0 以下版本
create or replace FUNCTION procInsertSchool
(pSchoolId Char(5),pSchoolName VarChar(100),pSchoolTelNo VarChar(8)
)
RETURNS void
language plpgsql
as $$
begin
IF NOT EXISTS (SELECT * FROM School WHERE SchoolId=pSchoolId)  then-- 存在相同的名称不添加  and SchoolId=@SchoolId  and SchoolName=@SchoolName
INSERT INTO School
(SchoolId ,SchoolName ,SchoolTelNo
)VALUES
(pSchoolId ,pSchoolName ,pSchoolTelNo
);
end if;
end;
$$

---postgreSQL 11.0 以上版本
DROP PROCEDURE IF EXISTS procInsertSchoolOutput;CREATE PROCEDURE procInsertSchoolOutput
(pSchoolName NVarChar(5),pSchoolTelNo VarChar(500),pSchoolId int  inout
)
language plpgsql
as $$
begin
IF NOT EXISTS (SELECT * FROM School WHERE SchoolName=pSchoolName)    -- 如果存在相同的记录，不添加
INSERT INTO School
(SchoolName,SchoolTelNo
)VALUES
(pSchoolName ,pSchoolTelNo);end;
$$

--返回值 inout
create or replace procedure geovindustat(inout total int default 0
)
as
$$
beginselect count(*) into total from geovindu;
end;
$$
language plpgsql;call geovindustat();-- 函数查询
CREATE OR REPLACE FUNCTION fungeovindu()
RETURNS table(tid int,tname varchar(50),TelNo varchar(11))
AS $$
BEGINRETURN QUERY(SELECT * FROM geovindu);
END;
$$ LANGUAGE plpgsqlselect * from fungeovindu();-- 查询DROP PROCEDURE IF EXISTS procSelectSchoolCREATE or replace PROCEDURE procSelectSchool
(pStudentId char(5)
)
language plpgsql SECURITY DEFINER
as $$
DECLARE schoolrow record;
begin
for schoolrow in (SELECT * FROM School WHERE SchoolId = pStudentId)loop
RAISE NOTICE 'Id is : % , SchoolName is : %', schoolrow."SchoolId",schoolrow."SchoolName"end loop;
end;
$$