postgresql 如何使用plpgsql检查值是否为整数?

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时间:2020-09-19 23:51:28  来源:igfitidea点击:

How to check, if a value is an integer with plpgsql?

sqldatabasepostgresqlplpgsql

提问by return1.at

i am using this function in a trigger:

我在触发器中使用这个函数:

CREATE OR REPLACE FUNCTION xx() RETURNS trigger AS $xx$
    BEGIN   
        INSERT INTO my_log (x, y, z) VALUES (NEW.x, NEW.y, current_setting('myvar.user'));
        RETURN NULL;
    END;
$xx$ LANGUAGE plpgsql;

now i would like to check, if 'myvar.user' is a valid integer, and if not, do another INSERT statement.

现在我想检查一下“myvar.user”是否是一个有效的整数,如果不是,再做一个 INSERT 语句。

how would i do this?

我该怎么做?

回答by Quassnoi

SELECT  current_setting('myvar.user') ~ '^[0-9]+$'

回答by Tomalak

Taken from archives.postgresql.org:

取自archives.postgresql.org

CREATE FUNCTION isnumeric(text) RETURNS boolean AS '
SELECT  ~ ''^[0-9]+$''
' LANGUAGE 'sql';