如何显示“不可见” psql / postgres中的unicode字符？ [英] How to display "invisible" unicode characters in psql / postgres?

问题描述

如何从psql（postgres命令行客户端）内部显示通常不可见的unicode字符？

How can I display normally invisible unicode characters from within psql (the postgres command line client)?

推荐答案

在Postgress表中看不见的Unicode，您将要同时使用 encode和 escape。只是为了好玩，转义功能需要强制转换以键入bytea。全部放在一起：

To see otherwise invisible Unicode in a postgress table, you'll want to use "encode" and "escape" both. And just for fun, the escape function requires a cast to type bytea. Putting it all together:

# CREATE TABLE xxx_test (foo text);
# INSERT INTO xxx_test (foo) values (E'Invis\u200eble €');

# SELECT foo from xxx_test;
Invis‎ble €
# SELECT encode(foo::bytea, 'escape') FROM xxx_test;
Invis\342\200\216ble \342\202\254

# DROP TABLE xxx_test;

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