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// Package stmtcache is a cache for statement descriptions.
package stmtcache
import (
"crypto/sha256"
"encoding/hex"
"github.com/jackc/pgx/v5/pgconn"
)
// StatementName returns a statement name that will be stable for sql across multiple connections and program
// executions.
func StatementName(sql string) string {
digest := sha256.Sum256([]byte(sql))
return "stmtcache_" + hex.EncodeToString(digest[0:24])
}
// 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
}
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