如何在 PostgreSql 的 RETURN QUERY EXECUTE 中编写 IF ELSE 语句

Question

我在 PostgreSQL 11 中的 RETURN QUERY EXECUTE 中编写 IF ELSE 语句时出现语法错误。

CREATE OR REPLACE FUNCTION tds_master.a_report(
    i_entity_id integer,
    i_client_id integer,
    i_branch_id integer,
    i_name text,
    i_finyear integer)
    RETURNS TABLE(employee_name character varying(100), pan character varying(10), optfor115bac character varying(1), 
                  taxable_income numeric, income_tax numeric, credit_us_87a numeric, surcharge numeric, education_cess numeric) 
    LANGUAGE 'plpgsql'AS
$BODY$
BEGIN
   RETURN QUERY EXECUTE 
    
   'if i_name != '' then   
     select
       ed.name as employee_name,
       ed.pan,
       sd.opting_for_us115bac,
       sd.total_taxable_income,
       sd.income_tax_on_total_income,
       sd.rebate_us87a,
       sd.surcharge,
       sd.education_cess
    from tds' || i_finyear || '.saldet sd
       inner join tds' || i_finyear || '.employee_deductee ed on ed.ed_id = sd.employee_id
       where sd.entity_id =  and sd.client_id =  and sd.branch_id =  and upper(ed.name)=upper(i_name);
       
    else
      
    select 
       ed.name as employee_name,
       ed.pan,
       sd.opting_for_us115bac,
       sd.total_taxable_income,
       sd.income_tax_on_total_income,
       sd.rebate_us87a,
       sd.surcharge,
       sd.education_cess
    from tds' || i_finyear || '.saldet sd
       inner join tds' || i_finyear || '.employee_deductee ed on ed.ed_id = sd.employee_id
       where sd.entity_id =  and sd.client_id =  and sd.branch_id = '
  
    USING i_entity_id, i_client_id, i_branch_id;
    
END;
$BODY$;

调用函数：

select * 
from tds_master.a_report(1547,6393,0,'MADAKE VINOD BABURAO',2021);

输出：

Answer 1

阅读评论中提示的 PL/pgSQL 语法。

但是，您可以只合并您的查询变体并使用普通 OR 作为可能为空/空的输入参数 i_name:

CREATE OR REPLACE FUNCTION tds_master.a_report(
    i_entity_id integer,
    i_client_id integer,
    i_branch_id integer,
    i_name text,
    i_finyear integer)
  RETURNS TABLE(employee_name varchar(100), pan varchar(10), optfor115bac varchar(1)
              , taxable_income numeric, income_tax numeric, credit_us_87a numeric
              , surcharge numeric, education_cess numeric) 
  LANGUAGE plpgsql AS
$func$
BEGIN
   RETURN QUERY EXECUTE format(
   $q$
   SELECT ed.name -- AS employee_name
        , ed.pan
        , sd.opting_for_us115bac
        , sd.total_taxable_income
        , sd.income_tax_on_total_income
        , sd.rebate_us87a
        , sd.surcharge
        , sd.education_cess
   FROM   %1$I.saldet sd
   JOIN   %1$I.employee_deductee ed ON ed.ed_id = sd.employee_id
   WHERE  sd.entity_id = 
   AND    sd.client_id = 
   AND    sd.branch_id =        
   AND   (i_name = '' OR  i_name IS NULL OR upper(ed.name) = upper(i_name))  -- !
   $q$, 'tds' || i_finyear::text)
   USING i_entity_id, i_client_id, i_branch_id;
END
$func$;

简单多了。性能相同。

我使用 format()，这是干净的方法。当然，虽然您只连接一个整数值，但普通连接相当安全。

如何在 PostgreSql 的 RETURN QUERY EXECUTE 中编写 IF ELSE 语句

How to Write IF ELSE Statements inside RETURN QUERY EXECUTE in PostgreSql

postgresql

plpgsql

postgresql-11