with function 語法支援
阿新 • • 發佈：2021-10-28
通過with子句，我們可以把很多原本需要儲存過程來實現的複雜邏輯用一句SQL來進行表達。KingbaseES 從V008R006C004B0021 版本開始，支援 with function 語法。例子如下：
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with
functionf_sum(i_relnamespace oid,i_relname text)returntext
is
v_name text;
begin
selecti_relnamespace::regnamespace||'.'||i_relnameintov_name ;
returnv_name;
end;
selectf_sum(relnamespace,relname)frompg_class limit 10;
f_sum
-------------------------------
pg_toast.pg_toast_16384
pg_toast.pg_toast_16384_index
public.t
pg_catalog.pg_statistic
pg_catalog.pg_type
pg_toast.pg_toast_2600
pg_toast.pg_toast_2600_index
pg_toast.pg_toast_2604pg_toast.pg_toast_2604_index
pg_toast.pg_toast_3456
(10rows)
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with function 可以支援DML 操作：
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with
functionf_sum(i_idinteger,i_name text)returntext
is
begin
insertintot1values(i_id,i_name);
returni_name;
end;
selectf_sum(oid,relname)frompg_class limit 10;
|