org.apache.spark.sql.jdbc.MySQLDialect.scala Maven / Gradle / Ivy
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* 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,
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package org.apache.spark.sql.jdbc
import java.sql.Types
import org.apache.spark.sql.types.{BooleanType, DataType, LongType, MetadataBuilder}
private case object MySQLDialect extends JdbcDialect {
override def canHandle(url : String): Boolean = url.startsWith("jdbc:mysql")
override def getCatalystType(
sqlType: Int, typeName: String, size: Int, md: MetadataBuilder): Option[DataType] = {
if (sqlType == Types.VARBINARY && typeName.equals("BIT") && size != 1) {
// This could instead be a BinaryType if we'd rather return bit-vectors of up to 64 bits as
// byte arrays instead of longs.
md.putLong("binarylong", 1)
Option(LongType)
} else if (sqlType == Types.BIT && typeName.equals("TINYINT")) {
Option(BooleanType)
} else None
}
override def quoteIdentifier(colName: String): String = {
s"`$colName`"
}
override def getTableExistsQuery(table: String): String = {
s"SELECT 1 FROM $table LIMIT 1"
}
override def isCascadingTruncateTable(): Option[Boolean] = Some(false)
}