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->sec
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...
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...
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; ...
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 ...
pg_catalog | version | function | PostgreSQL version string (1 row) 可以用COMMENTSQL命令生成对对象的描述。 \dD [pattern] 列出所有可用域。如果声明了pattern,那么只显示匹配的域。 \df [pattern] \df+ [pattern] 列出所有可用函数,以及它们的参数和返回的数据类型。如果声明了pattern,那么只显示匹配(正则...
问更改Postgres 12中的函数，允许日期默认或填充EN我试图添加一个日期字符串到这个函数，所以我没有得到...
[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...