/* * Copyright ( c ) 2015 , Oracle and / or its affiliates . All rights reserved . * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER . * * This code is free software ; you can redistribute it and / or modify it * under the terms of the GNU General Public License version 2 only , as * published by the Free Software Foundation . Oracle designates this * particular file as subject to the " Classpath " exception as provided * by Oracle in the LICENSE file that accompanied this code . * * This code is distributed in the hope that it will be useful , but WITHOUT * ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License * version 2 for more details ( a copy is included in the LICENSE file that * accompanied this code ) . * * You should have received a copy of the GNU General Public License version * 2 along with this work ; if not , write to the Free Software Foundation , * Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA . * * Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA * or visit www . oracle . com if you need additional information or have any * questions . package java.sql;/** * Interface used to indicate that this object represents a Sharding Key . A * { @ code ShardingKey } instance is only guaranteed to be compatible with the * data source instance that it was derived from . A { @ code ShardingKey } is * created using { @ link ShardingKeyBuilder } . * < p > * The following example illustrates the use of { @ link ShardingKeyBuilder } to * create a { @ code ShardingKey } : * < pre > * { @ code * * DataSource ds = new MyDataSource ( ) ; * ShardingKey shardingKey = ds . createShardingKeyBuilder ( ) * . subkey ( " abc " , JDBCType . VARCHAR ) * . subkey ( 94002 , JDBCType . INTEGER ) * . build ( ) ; * } * < / pre > * < p > * * A { @ code ShardingKey } may also be used for specifying a * { @ code superShardingKey } . Databases that support composite Sharding may use a * { @ code superShardingKey } to specify a additional level of partitioning within * the Shard . * < p > * The following example illustrates the use of { @ link ShardingKeyBuilder } to * create a { @ code superShardingKey } for an eastern region with a * { @ code ShardingKey } specified for the Pittsburgh branch office : * < pre > * { @ code * * DataSource ds = new MyDataSource ( ) ; * ShardingKey superShardingKey = ds . createShardingKeyBuilder ( ) * . subkey ( " EASTERN_REGION " , JDBCType . VARCHAR ) * . build ( ) ; * ShardingKey shardingKey = ds . createShardingKeyBuilder ( ) * . subkey ( " PITTSBURGH_BRANCH " , JDBCType . VARCHAR ) * . build ( ) ; * Connection con = ds . createConnectionBuilder ( ) * . superShardingKey ( superShardingKey ) * . shardingKey ( shardingKey ) * . build ( ) ; * } * < / pre > * * @ since 9 public interface ShardingKey {
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