Github user JustinPihony commented on a diff in the pull request: https://github.com/apache/spark/pull/12601#discussion_r77949090 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcRelationProvider.scala --- @@ -17,39 +17,106 @@ package org.apache.spark.sql.execution.datasources.jdbc +import java.sql.SQLException import java.util.Properties -import org.apache.spark.sql.SQLContext -import org.apache.spark.sql.sources.{BaseRelation, DataSourceRegister, RelationProvider} +import scala.collection.JavaConverters.mapAsJavaMapConverter -class JdbcRelationProvider extends RelationProvider with DataSourceRegister { +import org.apache.spark.sql.{DataFrame, SaveMode, SQLContext} +import org.apache.spark.sql.sources.{BaseRelation, CreatableRelationProvider, DataSourceRegister, RelationProvider} +import org.apache.spark.sql.types.StructType + +class JdbcRelationProvider extends CreatableRelationProvider + with RelationProvider with DataSourceRegister { override def shortName(): String = "jdbc" - /** Returns a new base relation with the given parameters. */ override def createRelation( sqlContext: SQLContext, parameters: Map[String, String]): BaseRelation = { val jdbcOptions = new JDBCOptions(parameters) - if (jdbcOptions.partitionColumn != null - && (jdbcOptions.lowerBound == null - || jdbcOptions.upperBound == null - || jdbcOptions.numPartitions == null)) { - sys.error("Partitioning incompletely specified") - } + val partitionColumn = jdbcOptions.partitionColumn + val lowerBound = jdbcOptions.lowerBound + val upperBound = jdbcOptions.upperBound + val numPartitions = jdbcOptions.numPartitions - val partitionInfo = if (jdbcOptions.partitionColumn == null) { - null + val partitionInfo = if (partitionColumn == null) { + null } else { JDBCPartitioningInfo( - jdbcOptions.partitionColumn, - jdbcOptions.lowerBound.toLong, - jdbcOptions.upperBound.toLong, - jdbcOptions.numPartitions.toInt) + partitionColumn, lowerBound.toLong, upperBound.toLong, numPartitions.toInt) } val parts = JDBCRelation.columnPartition(partitionInfo) val properties = new Properties() // Additional properties that we will pass to getConnection parameters.foreach(kv => properties.setProperty(kv._1, kv._2)) JDBCRelation(jdbcOptions.url, jdbcOptions.table, parts, properties)(sqlContext.sparkSession) } + + /* + * The following structure applies to this code: + * | tableExists | !tableExists + *------------------------------------------------------------------------------------ + * Ignore | BaseRelation | CreateTable, saveTable, BaseRelation + * ErrorIfExists | ERROR | CreateTable, saveTable, BaseRelation + * Overwrite* | (DropTable, CreateTable,) | CreateTable, saveTable, BaseRelation + * | saveTable, BaseRelation | + * Append | saveTable, BaseRelation | CreateTable, saveTable, BaseRelation + * + * *Overwrite & tableExists with truncate, will not drop & create, but instead truncate + */ + override def createRelation( + sqlContext: SQLContext, + mode: SaveMode, + parameters: Map[String, String], + data: DataFrame): BaseRelation = { + val jdbcOptions = new JDBCOptions(parameters) + val url = jdbcOptions.url + val table = jdbcOptions.table + + val props = new Properties() + props.putAll(parameters.asJava) + val conn = JdbcUtils.createConnectionFactory(url, props)() + + try { + val tableExists = JdbcUtils.tableExists(conn, url, table) + + val (doCreate, doSave) = (mode, tableExists) match { + case (SaveMode.Ignore, true) => (false, false) + case (SaveMode.ErrorIfExists, true) => throw new TableAlreadyExistsException( + s"Table $table already exists, and SaveMode is set to ErrorIfExists.") --- End diff -- No, [it is required...](https://github.com/apache/spark/blob/5c6b0855787c080d3e233eb09c05c025395e7cb3/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/AlreadyExistException.scala#L30)
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