/*
* 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 gobblin.source.extractor.extract.jdbc;
import gobblin.source.extractor.DataRecordException;
import gobblin.source.extractor.exception.HighWatermarkException;
import gobblin.source.extractor.utils.Utils;
import gobblin.source.extractor.watermark.Predicate;
import gobblin.source.extractor.watermark.WatermarkType;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
import com.google.common.collect.ImmutableMap;
import com.google.gson.JsonElement;
import gobblin.configuration.ConfigurationKeys;
import gobblin.configuration.WorkUnitState;
import gobblin.source.extractor.exception.RecordCountException;
import gobblin.source.extractor.exception.SchemaException;
import gobblin.source.extractor.extract.Command;
import gobblin.source.workunit.WorkUnit;
import lombok.extern.slf4j.Slf4j;
/**
* SqlServer extractor using JDBC protocol
*
* @author nveeramr
*/
@Slf4j
public class SqlServerExtractor extends JdbcExtractor {
private static final String TIMESTAMP_FORMAT = "yyyy-MM-dd HH:mm:ss";
private static final String DATE_FORMAT = "yyyy-MM-dd";
private static final String HOUR_FORMAT = "HH";
private static final long SAMPLERECORDCOUNT = -1;
public SqlServerExtractor(WorkUnitState workUnitState) {
super(workUnitState);
}
@Override
public List<Command> getSchemaMetadata(String schema, String entity) throws SchemaException {
log.debug("Build query to get schema");
List<Command> commands = new ArrayList<>();
List<String> queryParams = Arrays.asList(entity, schema);
String metadataSql = "select " + " col.column_name, " + " col.data_type, "
+ " case when CHARACTER_OCTET_LENGTH is null then 0 else 0 end as length, "
+ " case when NUMERIC_PRECISION is null then 0 else NUMERIC_PRECISION end as precesion, "
+ " case when NUMERIC_SCALE is null then 0 else NUMERIC_SCALE end as scale, "
+ " case when is_nullable='NO' then 'false' else 'true' end as nullable, " + " '' as format, "
+ " '' as comment " + " from information_schema.COLUMNS col "
+ " WHERE upper(col.table_name)=upper(?) AND upper(col.table_schema)=upper(?) "
+ " order by col.ORDINAL_POSITION ";
commands.add(JdbcExtractor.getCommand(metadataSql, JdbcCommand.JdbcCommandType.QUERY));
commands.add(JdbcExtractor.getCommand(queryParams, JdbcCommand.JdbcCommandType.QUERYPARAMS));
return commands;
}
@Override
public List<Command> getHighWatermarkMetadata(String schema, String entity, String watermarkColumn,
List<Predicate> predicateList) throws HighWatermarkException {
log.debug("Build query to get high watermark");
List<Command> commands = new ArrayList<>();
String columnProjection = "max(" + Utils.getCoalesceColumnNames(watermarkColumn) + ")";
String watermarkFilter = this.concatPredicates(predicateList);
String query = this.getExtractSql();
if (StringUtils.isBlank(watermarkFilter)) {
watermarkFilter = "1=1";
}
query = query.replace(this.getOutputColumnProjection(), columnProjection)
.replace(ConfigurationKeys.DEFAULT_SOURCE_QUERYBASED_WATERMARK_PREDICATE_SYMBOL, watermarkFilter);
commands.add(JdbcExtractor.getCommand(query, JdbcCommand.JdbcCommandType.QUERY));
return commands;
}
@Override
public List<Command> getCountMetadata(String schema, String entity, WorkUnit workUnit, List<Predicate> predicateList)
throws RecordCountException {
log.debug("Build query to get source record count");
List<Command> commands = new ArrayList<>();
String columnProjection = "COUNT(1)";
String watermarkFilter = this.concatPredicates(predicateList);
String query = this.getExtractSql();
if (StringUtils.isBlank(watermarkFilter)) {
watermarkFilter = "1=1";
}
query = query.replace(this.getOutputColumnProjection(), columnProjection)
.replace(ConfigurationKeys.DEFAULT_SOURCE_QUERYBASED_WATERMARK_PREDICATE_SYMBOL, watermarkFilter);
String sampleFilter = this.constructSampleClause();
if (!StringUtils.isEmpty(sampleFilter)) {
String col = sampleFilter + " 1 as col ";
query = "SELECT COUNT(1) FROM (" + query.replace(" COUNT(1) ", col) + ")temp";
}
commands.add(JdbcExtractor.getCommand(query, JdbcCommand.JdbcCommandType.QUERY));
return commands;
}
@Override
public List<Command> getDataMetadata(String schema, String entity, WorkUnit workUnit, List<Predicate> predicateList)
throws DataRecordException {
log.debug("Build query to extract data");
List<Command> commands = new ArrayList<>();
int fetchSize = this.workUnitState.getPropAsInt(ConfigurationKeys.SOURCE_QUERYBASED_JDBC_RESULTSET_FETCH_SIZE,
ConfigurationKeys.DEFAULT_SOURCE_QUERYBASED_JDBC_RESULTSET_FETCH_SIZE);
log.info("Setting jdbc resultset fetch size as " + fetchSize);
String watermarkFilter = this.concatPredicates(predicateList);
String query = this.getExtractSql();
if (StringUtils.isBlank(watermarkFilter)) {
watermarkFilter = "1=1";
}
query = query.replace(ConfigurationKeys.DEFAULT_SOURCE_QUERYBASED_WATERMARK_PREDICATE_SYMBOL, watermarkFilter);
String sampleFilter = this.constructSampleClause();
if (!StringUtils.isEmpty(sampleFilter)) {
String columnProjection = this.getOutputColumnProjection();
String newColumnProjection = sampleFilter + " " + columnProjection;
query = query.replace(columnProjection, newColumnProjection);
}
commands.add(JdbcExtractor.getCommand(query, JdbcCommand.JdbcCommandType.QUERY));
commands.add(JdbcExtractor.getCommand(fetchSize, JdbcCommand.JdbcCommandType.FETCHSIZE));
return commands;
}
@Override
public Map<String, String> getDataTypeMap() {
Map<String, String> dataTypeMap = ImmutableMap.<String, String> builder().put("smallint", "int")
.put("tinyint", "int").put("int", "int").put("bigint", "long").put("decimal", "double").put("numeric", "double")
.put("float", "float").put("real", "double").put("money", "double").put("smallmoney", "double")
.put("binary", "string").put("varbinary", "string").put("char", "string").put("varchar", "string")
.put("nchar", "string").put("nvarchar", "string").put("text", "string").put("ntext", "string")
.put("image", "string").put("hierarchyid", "string").put("uniqueidentifier", "string").put("date", "date")
.put("datetime", "timestamp").put("datetime2", "timestamp").put("datetimeoffset", "timestamp")
.put("smalldatetime", "timestamp").put("time", "time").put("bit", "boolean").build();
return dataTypeMap;
}
@Override
public Iterator<JsonElement> getRecordSetFromSourceApi(String schema, String entity, WorkUnit workUnit,
List<Predicate> predicateList) throws IOException {
return null;
}
@Override
public String getConnectionUrl() {
String host = this.workUnitState.getProp(ConfigurationKeys.SOURCE_CONN_HOST_NAME);
String port = this.workUnitState.getProp(ConfigurationKeys.SOURCE_CONN_PORT);
String url = "jdbc:sqlserver://" + host.trim() + ":" + port;
return url;
}
@Override
public long exractSampleRecordCountFromQuery(String query) {
if (StringUtils.isBlank(query)) {
return SAMPLERECORDCOUNT;
}
long recordcount = SAMPLERECORDCOUNT;
String inputQuery = query.toLowerCase();
int limitStartIndex = inputQuery.indexOf(" top ");
int limitEndIndex = getLimitEndIndex(inputQuery, limitStartIndex);
if (limitStartIndex > 0) {
String limitValue = query.substring(limitStartIndex + 5, limitEndIndex);
try {
recordcount = Long.parseLong(limitValue);
} catch (Exception e) {
log.error("Ignoring incorrct limit value in input query:" + limitValue);
}
}
return recordcount;
}
@Override
public String removeSampleClauseFromQuery(String query) {
if (StringUtils.isBlank(query)) {
return null;
}
String outputQuery = query;
String inputQuery = query.toLowerCase();
int limitStartIndex = inputQuery.indexOf(" top ");
int limitEndIndex = getLimitEndIndex(inputQuery, limitStartIndex);
if (limitStartIndex > 0) {
outputQuery = query.substring(0, limitStartIndex) + " " + query.substring(limitEndIndex);
}
return outputQuery;
}
private static int getLimitEndIndex(String inputQuery, int limitStartIndex) {
int limitEndIndex = -1;
if (limitStartIndex > 0) {
limitEndIndex = limitStartIndex + 5;
String remainingQuery = inputQuery.substring(limitEndIndex);
boolean numFound = false;
int pos = 0;
while (pos < remainingQuery.length()) {
char ch = remainingQuery.charAt(pos);
if (ch == ' ' && !numFound) {
pos++;
continue;
} else if (numFound && (!Character.isDigit(ch))) {
break;
} else {
numFound = true;
}
pos++;
}
limitEndIndex = limitEndIndex + pos;
}
return limitEndIndex;
}
@Override
public String constructSampleClause() {
long sampleRowCount = this.getSampleRecordCount();
if (sampleRowCount >= 0) {
return " top " + sampleRowCount;
}
return "";
}
@Override
public String getWatermarkSourceFormat(WatermarkType watermarkType) {
String columnFormat = null;
switch (watermarkType) {
case TIMESTAMP:
columnFormat = "yyyy-MM-dd HH:mm:ss";
break;
case DATE:
columnFormat = "yyyy-MM-dd";
break;
default:
log.error("Watermark type " + watermarkType.toString() + " not recognized");
}
return columnFormat;
}
@Override
public String getHourPredicateCondition(String column, long value, String valueFormat, String operator) {
log.debug("Getting hour predicate for Sqlserver");
String formattedvalue = Utils.toDateTimeFormat(Long.toString(value), valueFormat, HOUR_FORMAT);
return Utils.getCoalesceColumnNames(column) + " " + operator + " '" + formattedvalue + "'";
}
@Override
public String getDatePredicateCondition(String column, long value, String valueFormat, String operator) {
log.debug("Getting date predicate for Sqlserver");
String formattedvalue = Utils.toDateTimeFormat(Long.toString(value), valueFormat, DATE_FORMAT);
return Utils.getCoalesceColumnNames(column) + " " + operator + " '" + formattedvalue + "'";
}
@Override
public String getTimestampPredicateCondition(String column, long value, String valueFormat, String operator) {
log.debug("Getting timestamp predicate for Sqlserver");
String formattedvalue = Utils.toDateTimeFormat(Long.toString(value), valueFormat, TIMESTAMP_FORMAT);
return Utils.getCoalesceColumnNames(column) + " " + operator + " '" + formattedvalue + "'";
}
}