com.teradata.benchto.driver.execution.QueryExecutionDriver.java Source code

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Here is the source code for com.teradata.benchto.driver.execution.QueryExecutionDriver.java

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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,
 * 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.teradata.benchto.driver.execution;

import com.facebook.presto.jdbc.PrestoResultSet;
import com.google.common.collect.ImmutableMap;
import com.teradata.benchto.driver.execution.QueryExecutionResult.QueryExecutionResultBuilder;
import com.teradata.benchto.driver.loader.SqlStatementGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import java.util.Map;
import java.util.StringJoiner;

import static com.google.common.base.Preconditions.checkState;

public class QueryExecutionDriver {
    private static final Logger LOG = LoggerFactory.getLogger(QueryExecutionDriver.class);
    private static final int LOGGED_ROWS = 10;

    @Autowired
    private SqlStatementGenerator sqlStatementGenerator;

    public QueryExecutionResult execute(QueryExecution queryExecution, Connection connection) throws SQLException {
        QueryExecutionResultBuilder queryExecutionResultBuilder = new QueryExecutionResultBuilder(queryExecution)
                .startTimer();

        String sqlStatement = generateQuerySqlStatement(queryExecution);

        if (isSelectQuery(sqlStatement)) {
            return executeSelectQuery(connection, queryExecutionResultBuilder, sqlStatement);
        } else {
            return executeUpdateQuery(connection, queryExecutionResultBuilder, sqlStatement);
        }
    }

    private boolean isSelectQuery(String sql) {
        sql = sql.trim().toLowerCase();
        return sql.startsWith("select") || sql.startsWith("show") || sql.startsWith("with");
    }

    private QueryExecutionResult executeSelectQuery(Connection connection,
            QueryExecutionResultBuilder queryExecutionResultBuilder, String sqlStatement) throws SQLException {
        try (Statement statement = connection.createStatement();
                ResultSet resultSet = statement.executeQuery(sqlStatement)) {
            LOG.info("First {} rows for query: {}", LOGGED_ROWS, sqlStatement);

            int rowsCount = 0;
            while (resultSet.next()) {
                if (rowsCount < LOGGED_ROWS) {
                    logRow(rowsCount + 1, resultSet);
                } else if (rowsCount == LOGGED_ROWS) {
                    LOG.info("There are more unlogged rows");
                }
                rowsCount++;
            }

            try {
                if (resultSet.isWrapperFor(PrestoResultSet.class)) {
                    PrestoResultSet prestoResultSet = resultSet.unwrap(PrestoResultSet.class);
                    queryExecutionResultBuilder.setPrestoQueryId(prestoResultSet.getQueryId());
                }
            } catch (AbstractMethodError | Exception e) {
                // this error is caught by the compiler, but some drivers (hsqldb, hive, ...?) sucks
                LOG.warn("Driver ({}) does not support isWrapperFor/unwrap method", connection.toString());
            }

            return queryExecutionResultBuilder.setRowsCount(rowsCount).endTimer().build();
        }
    }

    private QueryExecutionResult executeUpdateQuery(Connection connection,
            QueryExecutionResultBuilder queryExecutionResultBuilder, String sqlStatement) throws SQLException {
        try (Statement statement = connection.createStatement()) {
            int rowCount = statement.executeUpdate(sqlStatement);
            return queryExecutionResultBuilder.setRowsCount(rowCount).endTimer().build();
        }
    }

    private String generateQuerySqlStatement(QueryExecution queryExecution) {
        Map<String, String> variables = ImmutableMap.<String, String>builder()
                .put("execution_sequence_id", "" + queryExecution.getRun())
                .putAll(queryExecution.getBenchmark().getNonReservedKeywordVariables()).build();
        List<String> sqlQueries = sqlStatementGenerator.generateQuerySqlStatement(queryExecution.getQuery(),
                variables);
        checkState(sqlQueries.size() == 1, "Multiple statements in one query file are not supported");
        return sqlQueries.get(0);
    }

    private void logRow(int rowNumber, ResultSet resultSet) throws SQLException {
        ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
        StringJoiner joiner = new StringJoiner("; ", "[", "]");
        for (int i = 1; i <= resultSetMetaData.getColumnCount(); ++i) {
            joiner.add(resultSetMetaData.getColumnName(i) + ": " + resultSet.getObject(i));
        }

        LOG.info("Row: " + rowNumber + ", column values: " + joiner.toString());
    }
}