peng-yongsheng commented on a change in pull request #1347: support 
shardingjdbc database storage feature
URL: 
https://github.com/apache/incubator-skywalking/pull/1347#discussion_r195148969
 
 

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 File path: 
apm-collector/apm-collector-storage/collector-storage-shardingjdbc-provider/src/main/java/org/apache/skywalking/apm/collector/storage/shardingjdbc/base/dao/AbstractPersistenceShardingjdbcDAO.java
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 @@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.skywalking.apm.collector.storage.shardingjdbc.base.dao;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import 
org.apache.skywalking.apm.collector.client.shardingjdbc.ShardingjdbcClient;
+import 
org.apache.skywalking.apm.collector.client.shardingjdbc.ShardingjdbcClientException;
+import org.apache.skywalking.apm.collector.core.data.CommonTable;
+import org.apache.skywalking.apm.collector.core.data.StreamData;
+import org.apache.skywalking.apm.collector.core.util.TimeBucketUtils;
+import org.apache.skywalking.apm.collector.storage.base.dao.IPersistenceDAO;
+import org.apache.skywalking.apm.collector.storage.base.sql.SqlBuilder;
+import 
org.apache.skywalking.apm.collector.storage.shardingjdbc.base.define.ShardingjdbcSqlEntity;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author linjiaqi
+ */
+public abstract class AbstractPersistenceShardingjdbcDAO<STREAM_DATA extends 
StreamData> extends ShardingjdbcDAO implements 
IPersistenceDAO<ShardingjdbcSqlEntity, ShardingjdbcSqlEntity, STREAM_DATA> {
+
+    private final Logger logger = 
LoggerFactory.getLogger(AbstractPersistenceShardingjdbcDAO.class);
+
+    public AbstractPersistenceShardingjdbcDAO(ShardingjdbcClient client) {
+        super(client);
+    }
+
+    private static final String GET_SQL = "select * from {0} where {1} = ?";
+
+    protected abstract STREAM_DATA shardingjdbcDataToStreamData(ResultSet 
resultSet) throws SQLException;
+
+    protected abstract String tableName();
+
+    @Override public STREAM_DATA get(String id) {
+        String sql = SqlBuilder.buildSql(GET_SQL, tableName(), 
CommonTable.ID.getName());
+
+        Object[] params = new Object[] {id};
+        try (
+                ResultSet rs = getClient().executeQuery(sql, params);
+                Statement statement = rs.getStatement();
+                Connection conn = statement.getConnection();
+            ) {
+            if (rs.next()) {
+                return shardingjdbcDataToStreamData(rs);
+            }
+        } catch (SQLException | ShardingjdbcClientException e) {
+            logger.error(e.getMessage(), e);
+        }
+        return null;
+    }
+
+    protected abstract Map<String, Object> 
streamDataToShardingjdbcData(STREAM_DATA streamData);
+
+    @Override public final ShardingjdbcSqlEntity 
prepareBatchInsert(STREAM_DATA streamData) {
+        Map<String, Object> source = streamDataToShardingjdbcData(streamData);
+        source.put(CommonTable.ID.getName(), streamData.getId());
+
+        ShardingjdbcSqlEntity entity = new ShardingjdbcSqlEntity();
+
+        String sql = SqlBuilder.buildBatchInsertSql(tableName(), 
source.keySet());
+        entity.setSql(sql);
+        entity.setParams(source.values().toArray(new Object[0]));
+        return entity;
+    }
+
+    @Override public final ShardingjdbcSqlEntity 
prepareBatchUpdate(STREAM_DATA streamData) {
+        Map<String, Object> source = streamDataToShardingjdbcData(streamData);
+
+        ShardingjdbcSqlEntity entity = new ShardingjdbcSqlEntity();
+        String sql = SqlBuilder.buildBatchUpdateSql(tableName(), 
source.keySet(), CommonTable.ID.getName());
+        entity.setSql(sql);
+        List<Object> values = new ArrayList<>(source.values());
+        values.add(streamData.getId());
+        entity.setParams(values.toArray(new Object[0]));
+        return entity;
+    }
+    
+    protected abstract String timeBucketColumnNameForDelete();
+
+    @Override public void deleteHistory(Long timeBucketBefore) {
+        ShardingjdbcClient client = getClient();
+        
+        String dynamicSql = "delete from {0} where {1} <= ?";
+        String sql = SqlBuilder.buildSql(dynamicSql, tableName(), 
timeBucketColumnNameForDelete());
+        
+        long timeBucket = 
TimeBucketUtils.INSTANCE.getMinuteTimeBucket(timeBucketBefore);
 
 Review comment:
   Why transform timeBucketBefore to  minute time bucket?

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