10     AsyncFunction("exec") { (dbName: String, queries: [[Any]], readOnly: Bool) -> [Any?] in  in definition()
11       guard let db = openDatabase(dbName: dbName) else {  in definition()
30     AsyncFunction("close") { (dbName: String) in  in definition()
31       cachedDatabases.removeValue(forKey: dbName)  in definition()
34     AsyncFunction("deleteAsync") { (dbName: String) in  in definition()
35       if cachedDatabases[dbName] != nil {  in definition()
36         throw DeleteDatabaseException(dbName)  in definition()
39       guard let path = self.pathForDatabaseName(name: dbName) else {  in definition()
44         throw DatabaseNotFoundException(dbName)  in definition()
50         throw DeleteDatabaseFileException(dbName)  in definition()
72   private func openDatabase(dbName: String) -> OpaquePointer? {  in openDatabase()
74     guard let path = try pathForDatabaseName(name: dbName) else {  in openDatabase()
81       db = cachedDatabases[dbName]  in openDatabase()
85       cachedDatabases.removeValue(forKey: dbName)  in openDatabase()
90       cachedDatabases[dbName] = db  in openDatabase()