public final class MasterSlaveMain {
    public static void main(final String[] args) throws SQLException {
        DataSource dataSource = getShardingDataSource();
        printSimpleSelect(dataSource);
    }
    private static void printSimpleSelect(final DataSource dataSource) throws SQLException {
        String sql = "SELECT i.* FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id WHERE o.user_id=? AND o.order_id=?";
        try (
                Connection conn = dataSource.getConnection();
                PreparedStatement preparedStatement = conn.prepareStatement(sql)) {
            preparedStatement.setInt(1, 10);
            preparedStatement.setInt(2, 1001);
            try (ResultSet rs = preparedStatement.executeQuery()) {
                while (rs.next()) {
                    System.out.println(rs.getInt(1));
                    System.out.println(rs.getInt(2));
                    System.out.println(rs.getInt(3));
                }
            }
        }
    }
    private static ShardingDataSource getShardingDataSource() throws SQLException {
        DataSourceRule dataSourceRule = new DataSourceRule(createDataSourceMap());
        TableRule orderTableRule = TableRule.builder("t_order").actualTables(Arrays.asList("t_order_0", "t_order_1")).dataSourceRule(dataSourceRule).build();
        TableRule orderItemTableRule = TableRule.builder("t_order_item").actualTables(Arrays.asList("t_order_item_0", "t_order_item_1")).dataSourceRule(dataSourceRule).build();
        ShardingRule shardingRule = ShardingRule.builder().dataSourceRule(dataSourceRule).tableRules(Arrays.asList(orderTableRule, orderItemTableRule))
                .databaseShardingStrategy(new DatabaseShardingStrategy("user_id", new ModuloDatabaseShardingAlgorithm()))
                .tableShardingStrategy(new TableShardingStrategy("order_id", new ModuloTableShardingAlgorithm())).build();
        return new ShardingDataSource(shardingRule);
    }
    private static Map<String, DataSource> createDataSourceMap() throws SQLException {
        Map<String, DataSource> result = new HashMap<>(2, 1);
        Map<String, DataSource> slaveDataSourceMap1 = new HashMap<>(2, 1);
        slaveDataSourceMap1.put("ds_0_slave_0", createDataSource("ds_0_slave_0"));
        slaveDataSourceMap1.put("ds_0_slave_1", createDataSource("ds_0_slave_1"));
        result.put("ds_0", MasterSlaveDataSourceFactory.createDataSource("ds_0", "ds_0_master", createDataSource("ds_0_master"), slaveDataSourceMap1));
        Map<String, DataSource> slaveDataSourceMap2 = new HashMap<>(2, 1);
        slaveDataSourceMap2.put("ds_1_slave_0", createDataSource("ds_1_slave_0"));
        slaveDataSourceMap2.put("ds_1_slave_1", createDataSource("ds_1_slave_1"));
        result.put("ds_1", MasterSlaveDataSourceFactory.createDataSource("ds_1", "ds_1_master", createDataSource("ds_1_master"), slaveDataSourceMap2));
        return result;
    }
    private static DataSource createDataSource(final String dataSourceName) {
        BasicDataSource result = new BasicDataSource();
        result.setDriverClassName(com.mysql.jdbc.Driver.class.getName());
        result.setUrl(String.format("jdbc:mysql://localhost:3306/%s", dataSourceName));
        result.setUsername("root");
        result.setPassword("123456");
        return result;
    }
}

Connection conn = dataSource.getConnection();
PreparedStatement preparedStatement = conn.prepareStatement(sql);
preparedStatement.executeQuery();

Connection conn = getConnection();
PreparedStatement preparedStatement1 = conn.prepareStatement(sql1);
preparedStatement1.executeQuery();
Connection conn2 = getConnection();
PreparedStatement preparedStatement2 = conn2.prepareStatement(sql2);
preparedStatement2.executeUpdate();

public Connection getConnection(final String dataSourceName, final SQLType sqlType) throws SQLException {
        if (getCachedConnections().containsKey(dataSourceName)) {
            return getCachedConnections().get(dataSourceName);
        }
        DataSource dataSource = shardingContext.getShardingRule().getDataSourceRule().getDataSource(dataSourceName);
        Preconditions.checkState(null != dataSource, "Missing the rule of %s in DataSourceRule", dataSourceName);
        String realDataSourceName;
        if (dataSource instanceof MasterSlaveDataSource) {
            NamedDataSource namedDataSource = ((MasterSlaveDataSource) dataSource).getDataSource(sqlType);
            realDataSourceName = namedDataSource.getName();
            if (getCachedConnections().containsKey(realDataSourceName)) {
                return getCachedConnections().get(realDataSourceName);
            }
            dataSource = namedDataSource.getDataSource();
        } else {
            realDataSourceName = dataSourceName;
        }
        Connection result = dataSource.getConnection();
        getCachedConnections().put(realDataSourceName, result);
        replayMethodsInvocation(result);
        return result;
    }

public NamedDataSource getDataSource(final SQLType sqlType) {
    if (isMasterRoute(sqlType)) {
        DML_FLAG.set(true);
        return new NamedDataSource(masterDataSourceName, masterDataSource);
    }
    String selectedSourceName = masterSlaveLoadBalanceStrategy.getDataSource(name, masterDataSourceName, new ArrayList<>(slaveDataSources.keySet()));
    DataSource selectedSource = selectedSourceName.equals(masterDataSourceName) ? masterDataSource : slaveDataSources.get(selectedSourceName);
    Preconditions.checkNotNull(selectedSource, "");
    return new NamedDataSource(selectedSourceName, selectedSource);
}
private static boolean isMasterRoute(final SQLType sqlType) {
    return SQLType.DQL != sqlType || DML_FLAG.get() || HintManagerHolder.isMasterRouteOnly();
}

HintManager hintManager = HintManager.getInstance();
hintManager.setMasterRouteOnly();

public final class RoundRobinMasterSlaveLoadBalanceStrategy implements MasterSlaveLoadBalanceStrategy {
    private static final ConcurrentHashMap<String, AtomicInteger> COUNT_MAP = new ConcurrentHashMap<>();
    @Override
    public String getDataSource(final String name, final String masterDataSourceName, final List<String> slaveDataSourceNames) {
        AtomicInteger count = COUNT_MAP.containsKey(name) ? COUNT_MAP.get(name) : new AtomicInteger(0);
        COUNT_MAP.putIfAbsent(name, count);
        count.compareAndSet(slaveDataSourceNames.size(), 0);
        return slaveDataSourceNames.get(count.getAndIncrement() % slaveDataSourceNames.size());
    }
}