com.spotify.scio.jdbc.sharded.ShardQuery.scala Maven / Gradle / Ivy
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/*
* Copyright 2020 Spotify AB.
*
* 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.spotify.scio.jdbc.sharded
sealed trait ShardQuery extends Serializable
final case class RangeShardQuery[T](
range: Range[T],
upperBoundInclusive: Boolean,
quoteValues: Boolean
) extends ShardQuery
final case class PrefixShardQuery[T](prefix: T) extends ShardQuery
object ShardQuery {
private val RangeQueryTemplate = "SELECT * FROM %s WHERE %s >= %s and %s %s %s"
private val PrefixQueryTemplate = "SELECT * FROM %s WHERE %s LIKE '%s%%'"
private def toSelectRangeStatement[T](
shardQuery: RangeShardQuery[T],
tableName: String,
shardColumn: String
): String = {
def applyQuotes(str: String): String = if (shardQuery.quoteValues) "'" + str + "'" else str
val uppBoundOp = if (shardQuery.upperBoundInclusive) "<=" else "<"
RangeQueryTemplate.format(
tableName,
shardColumn,
applyQuotes(shardQuery.range.lowerBound.toString),
shardColumn,
uppBoundOp,
applyQuotes(shardQuery.range.upperBound.toString)
)
}
def toSelectStatement(shardQuery: ShardQuery, tableName: String, shardColumn: String): String =
shardQuery match {
case rangeQuery @ RangeShardQuery(_, _, _) =>
toSelectRangeStatement(rangeQuery, tableName, shardColumn)
case PrefixShardQuery(prefix: String) =>
PrefixQueryTemplate.format(tableName, shardColumn, prefix)
case _ =>
throw new UnsupportedOperationException("The shard query isn't supported")
}
}