ERROR: acolumndefinition listisrequiredforfunctions returning "record" LINE1:selectf2,f1fromgetfoo_record();^ 这种方式还能执行动态SQL以及实现任意模式的行转列,如下: CREATEORREPLACEFUNCTIONrun_a_query(queryTEXT)RETURNSSETOF RECORDAS$$DECLAREretval RECORD;BEGINFORretvalINEXECUTEquery LOOPRETURNNEXTretval; ...
1. PostgreSQL的存储过程支持 returns SETOF record 来返回多行记录,这种方法在存储过程中内部使用了游标,效率比较高,另外应用也不用关心游标的关闭和释放的问题。 2. 如果存储过程返回多个结果集,需要用 returns SETOF refcursor 来返回多个结果集。
备注: 在返回指定 SETOF varchar 返回 varchar 类型单个字段,接下来介绍下返回多条记录多列的场景。 二 测试二:返回多条记录(多列) --2.1 使用游标和"RETURNS SETOF RECORD" 返回多条记录( 多列) CREATE OR REPLACE FUNCTION skytf.func_test_result_muti ( in_id integer) RETURNS SETOF RECORDas $$ DE...
Cloud Studio代码运行 dropfunctionf1;create or replacefunctionf1(ini int,out j int)returns setof intas$$ beginj:=i+1;returnnext;j:=i+2;returnnext;return;end$$ language plpgsql;select*fromf1(42);j---4344 但在内核实现中,并不是逐条返回的,return next其实只起到了缓存数据的功能,总的数据集...
第二种做法是不事先声明类型type, 返回record: 上面的returns...改为returns setof record 函数体内容: declarev_recrecord; begin forv_recin select... loop return nextv_rec; end loop; 然后你在调用时候,需要定义一个type结构接住数据. select * fromget_customer(...)asmy_customer(customerid int....
createor replacefunctionq_mp(VARIADICarr geometry[])returnssetofrecordas$$declaresqltext:=''; var geometry;beginforeachvarinarrayarrloopsql:=sql|| format(' select * from tbl where st_contains(''%s''::geometry, pos) union all', var);endloop;sql:= rtrim(sql,'union all');return queryex...
createor replacefunctionf1(int)returnssetofrecordas$$declarebeginsetlocalstatement_timeout='100ms';return queryselectcount(*)ascnt, idfromawhereid<$1groupbyid;end; $$languageplpgsqlstrict; 调用SQL改成这样 selectcnt,idfromf1(1)ast(cnt int8, idint); ...
CREATE OR REPLACE FUNCTION count_em_all (limitNum INTEGER) RETURNS SETOF table_count AS ' DECLARE the_count RECORD; -- 当前行数 t_name RECORD; -- 当前表名 r table_count%ROWTYPE; BEGIN -- 循环所有表,对于每个表进行相关操作。 FOR t_name IN select concat_ws(''.'',''"''||pn.nsp...
三、PostgreSQL辅助脚本1.批量修改timestamptz脚本批量修改表字段类型 timestamptz 为 timestamp, 因为我们说过前者无法与LocalDateTime对应上ps:timestamp without time zone 就是 timestamptimestamp with time zone 就是 timestamptzDO $$DECLARErec RECORD;BEGINFOR rec IN SELECT table_name, column_name,data_...
This type represents a list of field names and their data types, i.e. structure of a row or record of a table. Category - Object Identifier Types Object identifiers (OIDs) are used internally by PostgreSQL as primary keys for various system tables. ...