如何在postgresql中为所有表创建触发器？

Question

我有一个触发器,但我需要与我的postgres的所有表关联.下面有这样的命令吗？

CREATE TRIGGER delete_data_alldb
BEFORE DELETE
ON ALL DATABASE
FOR EACH ROW
EXECUTE PROCEDURE delete_data();

Answer 1

好吧,没有数据库范围的触发器创建,但是对于所有这样的批量管理操作,您可以使用PostgreSQL系统表为您生成查询,而不是手动编写它们.在这种情况下,您可以运行:

SELECT
    'CREATE TRIGGER '
    || tab_name
    || ' BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data();' AS trigger_creation_query
FROM (
    SELECT
        quote_ident(table_schema) || '.' || quote_ident(table_name) as tab_name
    FROM
        information_schema.tables
    WHERE
        table_schema NOT IN ('pg_catalog', 'information_schema')
        AND table_schema NOT LIKE 'pg_toast%'
) tablist;

这将为您提供一组字符串,这些字符串是SQL命令,如:

CREATE TRIGGER schema1.table1 BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data();
CREATE TRIGGER schema1.table2 BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data();
CREATE TRIGGER schema1.table3 BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data();
CREATE TRIGGER schema2.table1 BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data();
CREATE TRIGGER schema2."TABLE2" BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data();
...
etc

您只需要立即运行它们(通过psql或pgAdmin).

现在一些解释:

• 我使用information_schema.tables系统表选择数据库中的表名.因为有几乎所有表的数据,记得从你的表中排除pg_catalog和information_schema模式和toast表select.
• 我使用quote_ident(text)函数,""如果需要,将字符串放在双引号()中(即带有空格或大写字母的名称需要).
• 当我有表名列表时,我只是将它们与一些静态字符串连接起来以获取我的SQL命令.
• 我使用子查询编写该命令,因为我希望您能更好地了解这里发生了什么.您可以通过quote_ident(table_schema) || '.' || quote_ident(table_name)代替来编写单个查询tab_name.