19       guard let db = openDatabase(dbName: dbName) else {  in definition()  variable
32         return executeSql(sql: sql, with: args, for: db, readOnly: readOnly)  in definition()
94     var db: OpaquePointer?  in openDatabase()  variable
102       db = cachedDatabases[dbName]  in openDatabase()
105     if let db {  in openDatabase()
106       return db  in openDatabase()
111     if sqlite3_open(path.absoluteString, &db) != SQLITE_OK {  in openDatabase()
116       db, { (obj, action, _, tableName, rowId) in  in openDatabase()
131     cachedDatabases[dbName] = db  in openDatabase()
132     return db  in openDatabase()
135 …private func executeSql(sql: String, with args: [Any], for db: OpaquePointer, readOnly: Bool) -> […  in executeSql()
142     if sqlite3_prepare_v2(db, sql, -1, &statement, nil) != SQLITE_OK {  in executeSql()
143       return [convertSqlLiteErrorToString(db: db)]  in executeSql()
191         error = convertSqlLiteErrorToString(db: db)  in executeSql()
197       rowsAffected = sqlite3_changes(db)  in executeSql()
199         insertId = sqlite3_last_insert_rowid(db)  in executeSql()
246   private func convertSqlLiteErrorToString(db: OpaquePointer?) -> String {  in convertSqlLiteErrorToString()
247     let code = sqlite3_errcode(db)  in convertSqlLiteErrorToString()
248     let message = NSString(utf8String: sqlite3_errmsg(db)) ?? ""  in convertSqlLiteErrorToString()