18     AsyncFunction("exec") { (dbName: String, queries: [[Any]], readOnly: Bool) -> [Any?] in  in definition()
19       guard let db = openDatabase(dbName: dbName) else {  in definition()
38     AsyncFunction("close") { (dbName: String) in  in definition()
39       cachedDatabases.removeValue(forKey: dbName)  in definition()
42     Function("closeSync") { (dbName: String) in  in definition()
43       cachedDatabases.removeValue(forKey: dbName)  in definition()
46     AsyncFunction("deleteAsync") { (dbName: String) in  in definition()
47       if cachedDatabases[dbName] != nil {  in definition()
48         throw DeleteDatabaseException(dbName)  in definition()
51       guard let path = self.pathForDatabaseName(name: dbName) else {  in definition()
56         throw DatabaseNotFoundException(dbName)  in definition()
62         throw DeleteDatabaseFileException(dbName)  in definition()
93   private func openDatabase(dbName: String) -> OpaquePointer? {  in openDatabase()
95     guard let path = pathForDatabaseName(name: dbName) else {  in openDatabase()
102       db = cachedDatabases[dbName]  in openDatabase()
109     cachedDatabases.removeValue(forKey: dbName)  in openDatabase()
131     cachedDatabases[dbName] = db  in openDatabase()