query_string=0x1ab31b8 "select * from test_policy ;", paramTypes=0x0, numParams=0, queryEnv=0x0) at postgres.c:666 如上面堆栈信息所示,在QueryRewrite阶段,fireRIRrules函数中,会调用get_row_security_policies,将当前表达式添加到rte->securityQuals字段中,并且设置 parsetree->hasRowSecurity = true...
Input/Output \copy ... perform SQL COPY with data stream to the client host \echo [STRING] write string to standard output \i FILE execute commands from file \ir FILE as \i, but relative to location of current script \o [FILE] send all query results to file or |pipe \qecho [STRIN...
CREATE OR REPLACE FUNCTION get_data_by_city(city_name text) RETURNS TABLE (id integer, name text, city text) AS $$ DECLARE query text; cur refcursor; BEGIN -- 构建动态SQL查询语句 query := 'SELECT id, name, city FROM users WHERE city = $1'; -- 打开游标 OPEN cur...
CREATEORREPLACEFUNCTIONfuncname ( in_idinteger)RETURNSSETOFvarcharas$$DECLAREv_rec RECORD;BEGINreturnquery ( (selectnamefromtest_result1whereid=in_id)union(selectnamefromtest_result2whereid=in_id) );return;END; $$ LANGUAGE PLPGSQL; 注意:如果 返回类型为 setof,最好用如下方法 RETURNQUERYEXECUTESQ...
FOR EXECUTE query_string [USING expression [, ... ] ]; 1. 2. 在下面示例中,我们构建动态查询基于sort_field参数对结果进行排序,然后打开游标并执行动态查询: query := 'SELECT * FROM city ORDER BY $1'; OPEN cur_city FOR EXECUTE query USING sort_field; ...
RETURNQUERYEXECUTESQL 不要这么用 executesqlintoout;returnout; 返回多行多列 也有多种方式 1. 使用 return next 和 setof record ,需要 for 循环 CREATEORREPLACEFUNCTIONfuncname ( in_idinteger)RETURNSSETOF RECORDas$$DECLAREv_rec RECORD;BEGINforv_recin( (selectid , namefromtest_result1whereid=in...
create or replace function openai_gpt_call( question text, data_to_embed text, model text default 'gpt-4', token_limit int default 4096, api_key text default current_setting('opanai.api_key', true) ) returns text as $$ import requests, json prompt = """Be terse. Discuss only Postgr...
用户输入的update语句update dtea set id = 1由字符串会转为可由数据库理解的内部数据结构语法解析树UpdateStmt。执行逻辑在pg_parse_query(query_string);中,需要理解flex与bison。 gram.y中Update语法的定义: /*** * QUERY: * UpdateStmt (UPDATE)***/ //结合这条语句分析 update dtea ...
但是增删查改并不能代表sql语句的所有， 完整的sql功能会另人望而生畏。 就拿比普通增删查改稍微复杂...
[X] POST (create function) [X] PATCH (alter function) [X] DELETE (drop function) [X] /publications [X] GET (List) [X] POST (create publication) [X] PATCH (alter publication) [X] DELETE (drop publication) [X] /roles [X] GET (List) [X] POST (create role) [X] PATCH (al...