scala - 如何将DataFrame写入MySQL表

Question

很抱歉，如果这听起来很模糊，但可以解释一下将现有 DataFrame“df”写入 MySQL 表“product_mysql”的步骤，反之亦然。

Answer 1

请参阅this databricks article : Connecting to SQL Databases using JDBC.

import org.apache.spark.sql.SaveMode

val df = spark.table("...")
println(df.rdd.partitions.length)
// given the number of partitions above, users can reduce the partition value by calling coalesce() or increase it by calling repartition() to manage the number of connections.
df.repartition(10).write.mode(SaveMode.Append).jdbc(jdbcUrl, "product_mysql", connectionProperties)