我(仍然)要求您的帮助。我有一个PLPGSQL脚本,其骨架很好。在此基础上,我有6个脚本可以正常工作。但是,我有一个稍微复杂一些的第7个脚本。
CREATE or replace FUNCTION maFonction(table_ori varchar, annee_millesime varchar, annee_purge varchar) RETURNS void AS $$
DECLARE
MOIS_MM varchar := to_char(current_timestamp, 'MM');
ANNEE_AAAA varchar := to_char(current_timestamp, 'YYYY');
ANNEE_AA varchar := to_char(current_timestamp, 'YY');
cmd_create varchar := 'CREATE TABLE ' || table_ori || '_' || annee_millesime || ' AS TABLE ' || table_ori || ' WITH NO DATA;';
cmd_drop varchar := 'DROP TABLE IF EXISTS ' || table_ori || '_' || annee_purge ||';';
cmd_copie_suppr varchar := 'WITH tmp AS ( DELETE FROM ' || table_ori || ' WHERE SUBSTR(numprel, 1, 2) != ' || ANNEE_AA ||' RETURNING *) INSERT INTO ' || table_ori || '_' || annee_millesime || ' SELECT * FROM tmp ;';
BEGIN
execute cmd_create;
execute cmd_copie_suppr;
execute cmd_drop;
END;
$$ LANGUAGE plpgsql;
如您所见,在我的SQL查询中,我使用WHERE条件。但是,后者必然要求'(引号)考虑该值。但是这个值对我来说是一个变量。这是我在上面的代码中得到的错误
psql:./myscript.sql:66: ERROR: operator does not exist: text <> integer
LINE 1: ...schema.table WHERE SUBSTR(numprel, 1, 2) != 20 RETU...
^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.
QUERY: WITH tmp AS ( DELETE FROM schema.table WHERE SUBSTR(numprel, 1, 2) != 20 RETURNING *) INSERT INTO dschema.table_2019 SELECT * FROM tmp ;
CONTEXT: PL/pgSQL function mafonction(character varying,character varying,character varying) line 20 at EXECUTE statement
如何使此变量ANNEE_AA的值正确且介于'(引号)之间以发出正确的请求?
使用format
使事情变得简单:
format
CREATE or replace FUNCTION maFonction(table_ori varchar, annee_millesime varchar, annee_purge varchar)
RETURNS void
AS $$
DECLARE
MOIS_MM varchar := to_char(current_timestamp, 'MM');
ANNEE_AAAA varchar := to_char(current_timestamp, 'YYYY');
ANNEE_AA varchar := to_char(current_timestamp, 'YY');
cmd_create varchar := format('CREATE TABLE %I AS TABLE %I WITH NO DATA', table_ori || '_' || annee_millesime, table_ori);
cmd_drop varchar := format('DROP TABLE IF EXISTS %I ', table_ori || '_' || annee_purge);
cmd_copie_suppr varchar := format(
'WITH tmp AS (
DELETE FROM %I
WHERE SUBSTR(numprel, 1, 2) <> %L
RETURNING *
)
INSERT INTO %I
SELECT * FROM tmp', table_ori, annee_aa, table_ori || '_' || annee_millesime);
BEGIN
execute cmd_create;
execute cmd_copie_suppr;
execute cmd_drop;
END;
$$ LANGUAGE plpgsql;
插入一个标识符(必要时适当地双引号),%I
插入一个带有单引号的字符文字(必要时使用转义的嵌入式单引号)。