Merge branch 'dev' into dev

# Sharding-JDBC Organization

## Organization members

# Project Management Committee (PMC)

As a member of PMC, you **must** contribute and maintain the features or modules, and also take part in project management and building the eco-system. Because of that, you have following rights:

1. In charged with responsibility and governance for all projects/repositories in Sharding-JDBC organization.

1. Edit rights for all repositories.

1. Merge right for pull request.

1. Vote right for promoting contributor to Committer Team and PMC.

1. Start a vote for promoting contributor to Committer Team and PMC, pull request or feature discussion.

1. For now, only 张亮 [@terrymanu](https://github.com/terrymanu) has right to remove people from PMC or Committer Team.

The current Project Management Committee is as follows (in chronological order):

* 张亮, Zhang Liang, [@terrymanu](https://github.com/terrymanu) Architect director, Jingdong

* 曹昊, Cao Hao, [@ascrutae](https://github.com/haocao) Senior Architect, Dangdang

* 吴晟, Sheng Wu, [@wu-sheng](https://github.com/wu-sheng) APM and tracing expert, Apache SkyWalking(incubator) creator & PMC member

# Voting

In various situations the Sharding-JDBC shall hold a vote. These votes can happen on the phone, email, or via a voting service, when appropriate. Voters can either respond "agree, yes, +1", "disagree, no, -1", or "abstain". A vote passes with two-thirds vote of votes cast. An abstain vote equals not voting at all.

张亮 [@terrymanu](https://github.com/terrymanu) has a special veto power: override the voting result, default: not use.

/*

 * Copyright 1999-2015 dangdang.com.

 * <p>

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 * </p>

 */

package io.shardingjdbc.core.constant;

/**

 * Sharding constant.

 * 

 * @author zhangliang

 */

public interface ShardingConstant {

    /**

     * Logic database schema name.

     * 

     * <p>

     * Sharding-JDBC just have one logic database schema. 

     * Default: sharding_db

     * </p>

     */

    String LOGIC_SCHEMA_NAME = "sharding_db";

}

import io.shardingjdbc.core.jdbc.core.ShardingContext;

import io.shardingjdbc.core.jdbc.core.connection.ShardingConnection;

import io.shardingjdbc.core.rule.ShardingRule;

import lombok.Getter;

import java.sql.SQLException;

import java.util.Map;

 */

public class ShardingDataSource extends AbstractDataSourceAdapter implements AutoCloseable {

    @Getter

    private ShardingProperties shardingProperties;

    private ExecutorEngine executorEngine;

package io.shardingjdbc.core.merger.show;

import io.shardingjdbc.core.constant.ShardingConstant;

import io.shardingjdbc.core.merger.ResultSetMerger;

import java.io.InputStream;

 */

public final class ShowDatabasesResultSetMerger implements ResultSetMerger {

    private static final String LOGIC_DATABASE_NAME = "sharding_db";

    private boolean firstNext = true;

    @Override

    @Override

    public Object getValue(final int columnIndex, final Class<?> type) throws SQLException {

        return LOGIC_DATABASE_NAME;

        return ShardingConstant.LOGIC_SCHEMA_NAME;

    }

    @Override

    public Object getValue(final String columnLabel, final Class<?> type) throws SQLException {

        return LOGIC_DATABASE_NAME;

        return ShardingConstant.LOGIC_SCHEMA_NAME;

    }

    @Override

package io.shardingjdbc.core.merger.show;

import com.google.common.base.Optional;

import io.shardingjdbc.core.constant.ShardingConstant;

import io.shardingjdbc.core.merger.common.AbstractMemoryResultSetMerger;

import io.shardingjdbc.core.merger.common.MemoryResultSetRow;

import io.shardingjdbc.core.rule.ShardingRule;

    private final Set<String> tableNames = new HashSet<>();

    static {

        LABEL_AND_INDEX_MAP.put("Tables_in_sharding_db", 1); 

        LABEL_AND_INDEX_MAP.put("Tables_in_" + ShardingConstant.LOGIC_SCHEMA_NAME, 1); 

    }

    public ShowTablesResultSetMerger(final ShardingRule shardingRule, final List<ResultSet> resultSets) throws SQLException {