diff --git a/adapter/mysql/adapter_test.go b/adapter/mysql/adapter_test.go
index 3a7dd5f..f933a8a 100644
--- a/adapter/mysql/adapter_test.go
+++ b/adapter/mysql/adapter_test.go
@@ -28,13 +28,13 @@ func withDatabase(callback func(*Adapter)) {
 	config.User = os.Getenv("MYSQL_USER")
 	config.Passwd = os.Getenv("MYSQL_PASSWORD")
 	config.DBName = os.Getenv("MYSQL_DATABASE")
-	adapter, close, err := NewAdapter(config)
+	adapter, closeDatabase, err := NewAdapter(config)
 
 	if err != nil {
 		panic(err)
 	}
 
-	defer close() //nolint:errcheck
+	defer closeDatabase() //nolint:errcheck
 
 	adapter.db.MustExec("DROP TABLE IF EXISTS followers;")
 	adapter.db.MustExec("DROP TABLE IF EXISTS articles;")
diff --git a/adapter/oracle/adapter_test.go b/adapter/oracle/adapter_test.go
index 33f0caa..b19cd5f 100644
--- a/adapter/oracle/adapter_test.go
+++ b/adapter/oracle/adapter_test.go
@@ -26,13 +26,13 @@ func withDatabase(callback func(*Adapter)) {
 	config.Username = os.Getenv("ORACLE_USER")
 	config.Password = os.Getenv("ORACLE_PASSWORD")
 	config.ServiceName = os.Getenv("ORACLE_SERVICE")
-	adapter, close, err := NewAdapter(config)
+	adapter, closeDatabase, err := NewAdapter(config)
 
 	if err != nil {
 		panic(err)
 	}
 
-	defer close() //nolint:errcheck
+	defer closeDatabase() //nolint:errcheck
 
 	// adapter.db.MustExec("DROP TABLE followers")
 	// adapter.db.MustExec("DROP TABLE articles")
diff --git a/adapter/postgresql/adapter_test.go b/adapter/postgresql/adapter_test.go
index 2b2b1bf..fc03784 100644
--- a/adapter/postgresql/adapter_test.go
+++ b/adapter/postgresql/adapter_test.go
@@ -26,13 +26,13 @@ func withDatabase(callback func(*Adapter)) {
 	config.User = os.Getenv("POSTGRES_USER")
 	config.Password = os.Getenv("POSTGRES_PASSWORD")
 	config.DBName = os.Getenv("POSTGRES_DATABASE")
-	adapter, close, err := NewAdapter(config)
+	adapter, closeDatabase, err := NewAdapter(config)
 
 	if err != nil {
 		panic(err)
 	}
 
-	defer close() //nolint:errcheck
+	defer closeDatabase() //nolint:errcheck
 
 	adapter.db.MustExec("DROP TABLE IF EXISTS followers;")
 	adapter.db.MustExec("DROP TABLE IF EXISTS articles;")
diff --git a/adapter/sqlite3/adapter_test.go b/adapter/sqlite3/adapter_test.go
index a9aec2f..e129880 100644
--- a/adapter/sqlite3/adapter_test.go
+++ b/adapter/sqlite3/adapter_test.go
@@ -8,13 +8,13 @@ import (
 )
 
 func withDatabase(callback func(*Adapter)) {
-	adapter, close, err := NewAdapter("file::memory:?cache=shared")
+	adapter, closeDatabase, err := NewAdapter("file::memory:?cache=shared")
 
 	if err != nil {
 		panic(err)
 	}
 
-	defer close() //nolint:errcheck
+	defer closeDatabase() //nolint:errcheck
 
 	adapter.DB.MustExec("PRAGMA foreign_keys = ON;")
 
diff --git a/cmd/plant_erd-oracle/main.go b/cmd/plant_erd-oracle/main.go
index 507fc77..727ae1f 100644
--- a/cmd/plant_erd-oracle/main.go
+++ b/cmd/plant_erd-oracle/main.go
@@ -69,13 +69,13 @@ func main() {
 	)
 
 	app.Action = func(_ *cli.Context) error {
-		adapter, close, err := oracle.NewAdapter(oracleConfig)
+		adapter, closeDatabase, err := oracle.NewAdapter(oracleConfig)
 
 		if err != nil {
 			return errors.WithStack(err)
 		}
 
-		defer close() //nolint:errcheck
+		defer closeDatabase() //nolint:errcheck
 
 		schema, err := lib.LoadSchema(adapter)
 		if err != nil {
diff --git a/cmd/plant_erd/main.go b/cmd/plant_erd/main.go
index a9a9675..86d609d 100644
--- a/cmd/plant_erd/main.go
+++ b/cmd/plant_erd/main.go
@@ -54,13 +54,13 @@ func main() {
 				},
 			),
 			Action: func(_ *cli.Context) error {
-				adapter, close, err := sqlite3.NewAdapter(sqlite3Database)
+				adapter, closeDatabase, err := sqlite3.NewAdapter(sqlite3Database)
 
 				if err != nil {
 					return errors.WithStack(err)
 				}
 
-				defer close() //nolint:errcheck
+				defer closeDatabase() //nolint:errcheck
 
 				schema, err := lib.LoadSchema(adapter)
 				if err != nil {
@@ -122,13 +122,13 @@ func main() {
 				mysqlConfig.Net = "tcp"
 				mysqlConfig.Addr = fmt.Sprintf("%s:%d", mysqlHost, mysqlPort)
 
-				adapter, close, err := mysql.NewAdapter(mysqlConfig)
+				adapter, closeDatabase, err := mysql.NewAdapter(mysqlConfig)
 
 				if err != nil {
 					return errors.WithStack(err)
 				}
 
-				defer close() //nolint:errcheck
+				defer closeDatabase() //nolint:errcheck
 
 				schema, err := lib.LoadSchema(adapter)
 				if err != nil {
@@ -186,13 +186,13 @@ func main() {
 				},
 			),
 			Action: func(_ *cli.Context) error {
-				adapter, close, err := postgresql.NewAdapter(postgresqlConfig)
+				adapter, closeDatabase, err := postgresql.NewAdapter(postgresqlConfig)
 
 				if err != nil {
 					return errors.WithStack(err)
 				}
 
-				defer close() //nolint:errcheck
+				defer closeDatabase() //nolint:errcheck
 
 				schema, err := lib.LoadSchema(adapter)
 				if err != nil {
diff --git a/lib/erd_generator_test.go b/lib/erd_generator_test.go
index f273c90..8114bc2 100644
--- a/lib/erd_generator_test.go
+++ b/lib/erd_generator_test.go
@@ -14,13 +14,13 @@ import (
 )
 
 func withDatabase(callback func(*sqlite3.Adapter)) {
-	adapter, close, err := sqlite3.NewAdapter("file::memory:?cache=shared")
+	adapter, closeDatabase, err := sqlite3.NewAdapter("file::memory:?cache=shared")
 
 	if err != nil {
 		panic(err)
 	}
 
-	defer close() //nolint:errcheck
+	defer closeDatabase() //nolint:errcheck
 
 	adapter.DB.MustExec("PRAGMA foreign_keys = ON;")