Add error message for double-close

Fixes #101
zombiezen · May 24, 2024 · 3255b67 · 3255b67
1 parent a8ad27a
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 [Unreleased]: https://github.com/zombiezen/go-sqlite/compare/v1.3.0...main
 
+## [Unreleased][]
+
+### Changed
+
+- `Conn.Close` returns an error if the connection has already been closed
+  ([#101](https://github.com/zombiezen/go-sqlite/issues/101)).
+
 ## [1.3.0][] - 2024-05-04
 
 Version 1.3 is largely a bug-fix release,

diff --git a/sqlite.go b/sqlite.go
@@ -212,6 +212,9 @@ func (c *Conn) Close() error {
 	if c == nil {
 		return fmt.Errorf("sqlite: close: nil connection")
 	}
+	if c.closed {
+		return fmt.Errorf("sqlite: close: already closed")
+	}
 	c.cancelInterrupt()
 	c.closed = true
 	for _, stmt := range c.stmts {