Method openTable

ZezeJava/ZezeJava/src/main/java/Zeze/Dbh2/Database.java:155–168

(String name, int id)

	private final ConcurrentHashMap<String, Dbh2Table> tables = new ConcurrentHashMap<>();

	@Override
	public Table openTable(String name, int id) {
		if (name.contains("@"))
			throw new RuntimeException("'@' is reserve.");

		var special = "___"; // prefix table 使用这个最后
		var idx = name.indexOf(special);
		if (idx >= 0) {
			var tableName = name.substring(idx + special.length());
			return new Dbh2PrefixTable(tables.computeIfAbsent(tableName, Dbh2Table::new), id);
		}
		// 这里不使用tables，保留的旧的逻辑不变。
		return new Dbh2Table(name);
	}

	@Override
	public Transaction beginTransaction() {