英文:
SQL Error [22P02]: ERROR: invalid input value for enum tableName.date_unit: ""
问题
当我尝试获取表中所有行的列表时,出现了这个错误。这只发生在我在SELECT语句中包含其中一列时。该列本身是一个枚举列,我想在遇到空值时使用COALESCE函数处理该列。
以下是我代码的简化版本:
SELECT id,
user_id,
coalesce(date_unit, '') date_unit
FROM table_name
WHERE user_id = $1
当我尝试运行它时,出现了以下错误:
SQL Error [22P02]: ERROR: invalid input value for enum table_name.date_unit: ""
在使用SQLX和Golang运行时,出现了以下错误:
Pq: invalid input value for enum table_name.date_unit: ""
date_unit本身是一个枚举类型,它有限定的值。在表中,它只接受day和month作为值。但是很多行的date_unit列都有null值。
如果date_unit的值为null,我想将其转换为空字符串""。
COALESCE函数在处理枚举值时是否有问题?我应该如何使用COALESCE来实现我想要的功能?
英文:
I got this error when I try to get the list of all rows on my table. This only happens because I include one of the column in the SELECT. The column itself is an enum column and I wanna use COALESCE for the column in case it meets a null value.
This is a simplication of my code
SELECT id,
user_id,
coalesce(date_unit, '') date_unit
FROM table_name
WHERE user_id = $1
I got this error when I try to run it
SQL Error [22P02]: ERROR: invalid input value for enum table_name.date_unit: ""
This is the error when I run it using SQLX On Golang
Pq: invalid input value for enum table_name.date_unit: \"\"
date_unit itself is an enum which has restricted values. It only accepts day and month as value in the table. But lots of rows have null value in date_unit.
I wanna convert it to "" or empty string if date_unit value is null.
Is there a problem with the COALESCE with enum values? How should I use COALESCE to work with what I wanna do?
答案1
得分: 1
答案可以在问题的评论部分找到。
为了正式化它,由于date_unit不是string类型,所以在查询时无法返回它(无效的数据类型)。因此,在查询时,我们应该将date_unit转换为字符串类型。
可以使用以下查询来完成:
SELECT id,
user_id,
COALESCE(date_unit::text, '')
FROM table_name
WHERE user_id = $1
英文:
The answer is found in the comment section of the question.
To officiate it, as date_unit is not a string type, it cannot be returned when querying (invalid data type). As such, when querying, we should convert date_unit to string type.
This can be done using the query:
SELECT id,
user_id,
COALESCE(date_unit::text, '')
FROM table_name
WHERE user_id = $1
答案2
得分: 0
选择 id,
用户 id,
如果 date_unit 为空则返回空字符串
从表名中
其中用户 id = $1
英文:
SELECT id,
user_id,
coalesce(date_unit, '')
FROM table_name
WHERE user_id = $1
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