content: /*
   * Copyright (C) 2010-2101 Alibaba Group Holding Limited.
   *
   * 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.
   */
  
  package com.alibaba.otter.node.etl.common.db.dialect.mysql;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.lang.exception.NestableRuntimeException;
  import org.springframework.jdbc.core.JdbcTemplate;
  import org.springframework.jdbc.support.lob.LobHandler;
  import org.springframework.util.Assert;
  
  import com.alibaba.otter.node.etl.common.db.dialect.AbstractDbDialect;
  import com.alibaba.otter.shared.common.utils.meta.DdlUtils;
  import com.google.common.base.Function;
  import com.google.common.collect.OtterMigrateMap;
  
  /**
   * 基于mysql的一些特殊处理定义
   * 
   * @author jianghang 2011-10-27 下午01:46:57
   * @version 4.0.0
   */
  public class MysqlDialect extends AbstractDbDialect {
  
      private boolean                   isDRDS = false;
      private Map<List<String>, String> shardColumns;
  
      public MysqlDialect(JdbcTemplate jdbcTemplate, LobHandler lobHandler){
          super(jdbcTemplate, lobHandler);
          sqlTemplate = new MysqlSqlTemplate();
      }
  
      public MysqlDialect(JdbcTemplate jdbcTemplate, LobHandler lobHandler, String name, String databaseVersion,
                          int majorVersion, int minorVersion){
          super(jdbcTemplate, lobHandler, name, majorVersion, minorVersion);
          sqlTemplate = new MysqlSqlTemplate();
  
          if (StringUtils.contains(databaseVersion, "-TDDL-")) {
              isDRDS = true;
              initShardColumns();
          }
      }
  
      private void initShardColumns() {
          this.shardColumns = OtterMigrateMap.makeSoftValueComputingMap(new Function<List<String>, String>() {
  
              public String apply(List<String> names) {
                  Assert.isTrue(names.size() == 2);
                  try {
                      String result = DdlUtils.getShardKeyByDRDS(jdbcTemplate, names.get(0), names.get(0), names.get(1));
                      if (StringUtils.isEmpty(result)) {
                          return "";
                      } else {
                          return result;
                      }
                  } catch (Exception e) {
                      throw new NestableRuntimeException("find table [" + names.get(0) + "." + names.get(1) + "] error",
                          e);
                  }
              }
          });
      }
  
      public boolean isCharSpacePadded() {
          return false;
      }
  
      public boolean isCharSpaceTrimmed() {
          return true;
      }
  
      public boolean isEmptyStringNulled() {
          return false;
      }
  
      public boolean isSupportMergeSql() {
          return true;
      }
  
      public String getDefaultSchema() {
          return null;
      }
  
      public boolean isDRDS() {
          return isDRDS;
      }
  
      public String getShardColumns(String schema, String table) {
          if (isDRDS()) {
              return shardColumns.get(Arrays.asList(schema, table));
          } else {
              return null;
          }
      }
  
      public String getDefaultCatalog() {
          return (String) jdbcTemplate.queryForObject("select database()", String.class);
      }
  
  }
  