
org.apache.spark.sql.jdbc.DB2Dialect.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
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package org.apache.spark.sql.jdbc
import java.sql.Types
import java.util.Locale
import org.apache.spark.sql.types._
private object DB2Dialect extends JdbcDialect {
override def canHandle(url: String): Boolean =
url.toLowerCase(Locale.ROOT).startsWith("jdbc:db2")
override def getCatalystType(
sqlType: Int,
typeName: String,
size: Int,
md: MetadataBuilder): Option[DataType] = sqlType match {
case Types.REAL => Option(FloatType)
case Types.OTHER =>
typeName match {
case "DECFLOAT" => Option(DecimalType(38, 18))
case "XML" => Option(StringType)
case t if (t.startsWith("TIMESTAMP")) => Option(TimestampType) // TIMESTAMP WITH TIMEZONE
case _ => None
}
case _ => None
}
override def getJDBCType(dt: DataType): Option[JdbcType] = dt match {
case StringType => Option(JdbcType("CLOB", java.sql.Types.CLOB))
case BooleanType => Option(JdbcType("CHAR(1)", java.sql.Types.CHAR))
case ShortType | ByteType => Some(JdbcType("SMALLINT", java.sql.Types.SMALLINT))
case _ => None
}
override def isCascadingTruncateTable(): Option[Boolean] = Some(false)
// scalastyle:off line.size.limit
// See https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000980.html
// scalastyle:on line.size.limit
override def renameTable(oldTable: String, newTable: String): String = {
s"RENAME TABLE $oldTable TO $newTable"
}
// scalastyle:off line.size.limit
// See https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000888.html
// scalastyle:on line.size.limit
override def getUpdateColumnTypeQuery(
tableName: String,
columnName: String,
newDataType: String): String =
s"ALTER TABLE $tableName ALTER COLUMN ${quoteIdentifier(columnName)}" +
s" SET DATA TYPE $newDataType"
// scalastyle:off line.size.limit
// See https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000888.html
// scalastyle:on line.size.limit
override def getUpdateColumnNullabilityQuery(
tableName: String,
columnName: String,
isNullable: Boolean): String = {
val nullable = if (isNullable) "DROP NOT NULL" else "SET NOT NULL"
s"ALTER TABLE $tableName ALTER COLUMN ${quoteIdentifier(columnName)} $nullable"
}
}
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