使用raise notice TG_NAME跟踪调用顺序 : // 表举例 // 创建测试表 postgres=# create table digoal (id int); CREATE TABLE // 创建触发器函数 postgres=# create or replace function debug() returns trigger as $$ declare begin raise notice '%', TG_NAME; return new; end; $$ language plpgsql;...
#definePG_FUNCTION_ARGSFunctionCallInfo fcinfo typedef struct FunctionCallInfoData*FunctionCallInfo;typedefDatum(*PGFunction)(FunctionCallInfo fcinfo);typedef struct Node*fmNodePtr;typedef uintptr_t Datum;typedef struct Node{NodeTag type;//NodeTag 这是一个枚举类型}Node;typedef struct FmgrInfo{PGFunction ...
The unnest() function in PostgreSQL is used to expand an array into a set of rows. It takes an array as input and returns a new table where each element of the array occupies a separate row. This function is particularly useful for normalizing denormalized data stored in array formats and ...
CREATE TABLE sales_data ( order_id UUID PRIMARY KEY, product_name VARCHAR(255), category VARCHAR(50), region VARCHAR(50), sales_amount NUMERIC(10,2), order_date DATE, customer_id UUID ); -- 插入100条模拟数据(兼容PostgreSQL 9.2,修复日期加法类型错误) WITH products AS ( SELECT unnest(ARRAY...
PolarDB PostgreSQL版(兼容Oracle)2.0版本支持rownum语法来标志查询结果中的行号;支持全局唯一的序列;支持select/delete/update作用于子查询的语法;支持select for update wait语法;支持merge into语法在视图中使用;支持基本的HINT语法;支持Rename To语法;支持alter table add (col1, col2)语法;...
zero or more rows to the function’s result set. If you declared the function with output parameters, write just RETURN NEXT with no expression. Here is an example of a function using RETURN NEXT: CREATETABLEfoo (fooidINT, foosubidINT, fooname TEXT);INSERTINTOfooVALUES(1,2,'three');IN...
create or replace function fun_ran return varchar2 is v1 number; begin v1:=dbms_random.value(1,100); if v1 >95 then return '1等奖'; elsif v1>85 then return '2等奖'; elsif v1>70 then return '3等奖'; else return '谢谢惠顾'; ...
public Object table() Get the table property: The PostgreSQL table name. Type: string (or Expression with resultType string). Returns: the table value.tableName public Object tableName() Get the tableName property: This property will be retired. Please consider using schema + table proper...
(1 row) FETCH ALL IN "<unnamed cursor 1>"; COMMIT; CREATE FUNCTION myfunc(refcursor, refcursor) RETURNS SETOF refcursor AS $$ BEGIN OPEN $1 FOR SELECT * FROM table_1; RETURN NEXT $1; OPEN $2 FOR SELECT * FROM table_2; RETURN NEXT $2; END; $$ LANGUAGE plpgsql; -- need to ...
In the UPDATE command, curtime, comment, and id will refer to the function’s variable and parameters whether or not users has columns of those names. Notice that we had to qualify the reference to users.id in the WHERE clause to make it refer to the table column. But we did not have...