fix #386

## 2.0.0.M1

### 功能提升

1. [ISSUE #386](https://github.com/shardingjdbc/sharding-jdbc/issues/386) 支持SELECT 1这种不包含表名称的SQL

### 缺陷修正

1. [ISSUE #387](https://github.com/shardingjdbc/sharding-jdbc/issues/387) 当函数+列名中存在'`'防止关键字时处理出错

package io.shardingjdbc.core.routing.router;

import io.shardingjdbc.core.routing.type.all.DatabaseAllRoutingEngine;

import io.shardingjdbc.core.rule.ShardingRule;

import io.shardingjdbc.core.constant.DatabaseType;

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

    private RoutingResult route(final List<Object> parameters, final SQLStatement sqlStatement) {

        Collection<String> tableNames = sqlStatement.getTables().getTableNames();

        RoutingEngine routingEngine;

        if (1 == tableNames.size() || shardingRule.isAllBindingTables(tableNames) || shardingRule.isAllInDefaultDataSource(tableNames)) {

        if (tableNames.isEmpty()) {

            routingEngine = new DatabaseAllRoutingEngine(shardingRule.getDataSourceMap());

        } else if (1 == tableNames.size() || shardingRule.isAllBindingTables(tableNames) || shardingRule.isAllInDefaultDataSource(tableNames)) {

            routingEngine = new SimpleRoutingEngine(shardingRule, parameters, tableNames.iterator().next(), sqlStatement);

        } else {

            // TODO config for cartesian set

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 * 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,

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 * See the License for the specific language governing permissions and

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package io.shardingjdbc.core.routing.type.all;

import io.shardingjdbc.core.routing.type.RoutingEngine;

import io.shardingjdbc.core.routing.type.RoutingResult;

import io.shardingjdbc.core.routing.type.TableUnit;

import lombok.RequiredArgsConstructor;

import lombok.extern.slf4j.Slf4j;

import javax.sql.DataSource;

import java.util.Map;

/**

 * Database all routing engine.

 * 

 * @author zhangliang

 */

@RequiredArgsConstructor

@Slf4j

public final class DatabaseAllRoutingEngine implements RoutingEngine {

    private final Map<String, DataSource> dataSourceMap;

    @Override

    public RoutingResult route() {

        RoutingResult result = new RoutingResult();

        for (String each : dataSourceMap.keySet()) {

            result.getTableUnits().getTableUnits().add(new TableUnit(each, "", ""));

        }

        return result;

    }

}

<?xml version="1.0" encoding="UTF-8"?>

<sqls>

    <sql id="assertSelectOne">

        <sharding-rule>

            <data expected="select/SelectOne.xml" />

        </sharding-rule>

    </sql>

    <sql id="assertSelectNotEqualsWithSingleTable">

        <sharding-rule value="tbl">

            <data parameter="100000" expected="select/SelectNotEqualsWithSingleTable.xml" />

<dataset>

    <t_order a="1" />

</dataset>