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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.shardingsphere.proxy.backend.mysql.handler.admin.executor;
19  
20  import lombok.Getter;
21  import lombok.RequiredArgsConstructor;
22  import org.apache.shardingsphere.infra.executor.sql.execute.result.query.QueryResult;
23  import org.apache.shardingsphere.infra.executor.sql.execute.result.query.QueryResultMetaData;
24  import org.apache.shardingsphere.infra.executor.sql.execute.result.query.impl.raw.metadata.RawQueryResultColumnMetaData;
25  import org.apache.shardingsphere.infra.executor.sql.execute.result.query.impl.raw.metadata.RawQueryResultMetaData;
26  import org.apache.shardingsphere.infra.executor.sql.execute.result.query.impl.raw.type.RawMemoryQueryResult;
27  import org.apache.shardingsphere.infra.merge.result.MergedResult;
28  import org.apache.shardingsphere.infra.merge.result.impl.transparent.TransparentMergedResult;
29  import org.apache.shardingsphere.proxy.backend.session.ConnectionSession;
30  import org.apache.shardingsphere.proxy.backend.handler.admin.executor.DatabaseAdminQueryExecutor;
31  import org.apache.shardingsphere.sql.parser.sql.dialect.statement.mysql.dal.MySQLShowFunctionStatusStatement;
32  
33  import java.sql.Types;
34  import java.util.ArrayList;
35  import java.util.Collections;
36  import java.util.List;
37  
38  /**
39   * Show function status executor.
40   */
41  @RequiredArgsConstructor
42  @Getter
43  public final class ShowFunctionStatusExecutor implements DatabaseAdminQueryExecutor {
44      
45      private final MySQLShowFunctionStatusStatement showFunctionStatusStatement;
46      
47      private QueryResultMetaData queryResultMetaData;
48      
49      private MergedResult mergedResult;
50      
51      @Override
52      public void execute(final ConnectionSession connectionSession) {
53          queryResultMetaData = createQueryResultMetaData();
54          mergedResult = new TransparentMergedResult(getQueryResult());
55      }
56      
57      private QueryResult getQueryResult() {
58          return new RawMemoryQueryResult(queryResultMetaData, Collections.emptyList());
59      }
60      
61      private QueryResultMetaData createQueryResultMetaData() {
62          List<RawQueryResultColumnMetaData> columns = new ArrayList<>();
63          columns.add(new RawQueryResultColumnMetaData("", "Db", "Db", Types.VARCHAR, "VARCHAR", 255, 0));
64          columns.add(new RawQueryResultColumnMetaData("", "Name", "Name", Types.VARCHAR, "VARCHAR", 255, 0));
65          columns.add(new RawQueryResultColumnMetaData("", "Type", "Type", Types.VARCHAR, "VARCHAR", 64, 0));
66          columns.add(new RawQueryResultColumnMetaData("", "Definer", "Definer", Types.VARCHAR, "VARCHAR", 64, 0));
67          columns.add(new RawQueryResultColumnMetaData("", "Modified", "Modified", Types.VARCHAR, "VARCHAR", 64, 0));
68          columns.add(new RawQueryResultColumnMetaData("", "Created", "Created", Types.VARCHAR, "VARCHAR", 64, 0));
69          columns.add(new RawQueryResultColumnMetaData("", "Security_type", "Security_type", Types.VARCHAR, "VARCHAR", 64, 0));
70          columns.add(new RawQueryResultColumnMetaData("", "Comment", "Comment", Types.VARCHAR, "VARCHAR", 120, 0));
71          columns.add(new RawQueryResultColumnMetaData("", "character_set_client", "character_set_client", Types.VARCHAR, "VARCHAR", 20, 0));
72          columns.add(new RawQueryResultColumnMetaData("", "collation_connection", "collation_connection", Types.VARCHAR, "VARCHAR", 20, 0));
73          columns.add(new RawQueryResultColumnMetaData("", "Database_Collation", "Database_Collation", Types.VARCHAR, "VARCHAR", 20, 0));
74          return new RawQueryResultMetaData(columns);
75      }
76  }