英文:
Go SQL syntax error
问题
我正在尝试使用database/sql将一行插入到Postgres表中。我运行的代码如下所示：
...
res, err := db.Exec("INSERT INTO image(name) VALUES(?);", fname)
if err != nil {
return err
}
...
fname是一个字符串，类似于"image-name.png"。image表是通过以下语句创建的：
...
_, err := db.Exec("CREATE TABLE image (id SERIAL, name VARCHAR)")
...
在运行了CREATE TABLE语句之后，我可以进入psql并手动运行以下语句：
INSERT INTO image(name) VALUES('some-random-image.jpg');
这样就会将相应的行添加到image表中。然而，上面的INSERT Exec调用始终报错，错误信息为pq: syntax error at or near ")"。
有人能指出我在这里做错了什么吗？
另外，作为后续问题，有没有办法在go中查看语句格式化的结果？我想到了类似于func Preview(template string, args...) string的函数，用法如下：
Preview("INSERT INTO tbl(col) VALUES(?);", "test")
=> "INSERT INTO tbl(col) VALUES('test');"
请注意，我只会返回翻译好的部分，不会回答关于翻译的问题。
英文:
I'm trying to insert a row into a Postgres table using database/sql. The code I'm running looks like
...
res, err := db.Exec("INSERT INTO image(name) VALUES(?);", fname)
if err != nil {
return err
}
...
fname is a string. Something like "image-name.png". The image table was created by the statement
...
_, err := db.Exec("CREATE TABLE image (id SERIAL, name VARCHAR)")
...
After running that CREATE TABLE statement, I'm able to hop into psql and manually run
INSERT INTO image(name) VALUES('some-random-image.jpg');
with the appropriate row being added to the image table. However, the INSERT Exec call above consistently errors with pq: syntax error at or near ")".
Can anyone point out what I'm doing wrong here?
Also, as a follow-up, is there any way to see the result of statement formatting in go? I'm thinking of something like func Preview (template string, args...) string such that
Preview("INSERT INTO tbl(col) VALUES(?);", "test")
=> "INSERT INTO tbl(col) VALUES('test');"
答案1
得分: 4
你需要在你的SQL中使用$1、$2等作为占位符值。占位符字符是依赖于数据库的，对于Postgres来说，它们是$X。
英文:
You need to use $1, $2, ... as placeholder values in your SQL. The placeholder characters are DB dependent and for Postgres they are $X.
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