Go SQL语法错误[重复]

Question

This question already has an answer here:

• “Operator does not exist: integer =?” when using Postgres 1 answer

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');"

</div>

Answer 1

You need to use $1, $2, ... as placeholder values in your SQL. The placeholder characters are DB dependent and for Postgres they are $X.