在 MySQL 中将值设置为 NULL
如果我提交的表单的文本框中没有放入任何内容，我希望将一个值设置为 NULL.我怎样才能做到这一点?我试过插入 'NULL' 但这只是将 NULL 这个词添加到字段中.
I want a value to be set to NULL if nothing is put into the text box in the form I'm submitting. How can I make this happen?
I've tried inserting 'NULL' but this just adds the word NULL into the field.
我不确定我应该为此提供什么代码，我只是在写一个 UPDATE 查询.
I'm not sure what code I should provide for this, I'm just writing an UPDATE query.
推荐答案
不要将 NULL 放在更新语句中的引号内.这应该有效:
Don't put NULL inside quotes in your update statement. This should work:
UPDATE table SET field = NULL WHERE something = something
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