PostgreSQL输入末尾的语法错误

Question

I have used the next SQL statement in both MySQL and PostgreSQL, but it fails in PostgreSQL

db.Query(`SELECT COUNT(*) as N FROM email WHERE address = ?`, email)

with this error:

pq: F:"scan.l" M:"syntax error at end of input" S:"ERROR" C:"42601" P:"50" R:"scanner_yyerror" L:"993"

What's the problem? The error messages in PostgreSQL are very cryptic.

Answer 1

You haven't provided any details about the language/environment, but I'll try a wild guess anyway:

MySQL's prepared statements natively use ? as the parameter placeholder, but PostgreSQL uses $1, $2 etc. Try replacing the ? with $1 and see if it works:

WHERE address = $1

The error messages in PostgreSQL are very cryptic.

In general, I've found that Postgres error messages are better than competing products (ahem, MySQL and especially Oracle), but in this instance you've managed to confuse the parser beyond sanity. :)