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// Package stmtcache is a cache for statement descriptions.
package stmtcache
import (
"strconv"
"sync/atomic"
"github.com/jackc/pgx/v5/pgconn"
)
var stmtCounter int64
// NextStatementName returns a statement name that will be unique for the lifetime of the program.
func NextStatementName() string {
n := atomic.AddInt64(&stmtCounter, 1)
return "stmtcache_" + strconv.FormatInt(n, 10)
}
// Cache caches statement descriptions.
type Cache interface {
// Get returns the statement description for sql. Returns nil if not found.
Get(sql string) *pgconn.StatementDescription
// Put stores sd in the cache. Put panics if sd.SQL is "". Put does nothing if sd.SQL already exists in the cache.
Put(sd *pgconn.StatementDescription)
// Invalidate invalidates statement description identified by sql. Does nothing if not found.
Invalidate(sql string)
// InvalidateAll invalidates all statement descriptions.
InvalidateAll()
// HandleInvalidated returns a slice of all statement descriptions invalidated since the last call to HandleInvalidated.
HandleInvalidated() []*pgconn.StatementDescription
// Len returns the number of cached prepared statement descriptions.
Len() int
// Cap returns the maximum number of cached prepared statement descriptions.
Cap() int
}
func IsStatementInvalid(err error) bool {
pgErr, ok := err.(*pgconn.PgError)
if !ok {
return false
}
// https://github.com/jackc/pgx/issues/1162
//
// We used to look for the message "cached plan must not change result type". However, that message can be localized.
// Unfortunately, error code "0A000" - "FEATURE NOT SUPPORTED" is used for many different errors and the only way to
// tell the difference is by the message. But all that happens is we clear a statement that we otherwise wouldn't
// have so it should be safe.
possibleInvalidCachedPlanError := pgErr.Code == "0A000"
return possibleInvalidCachedPlanError
}
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