如何将DataFrame写入MySQL表

Question

很抱歉，如果听起来模糊不清，可以解释编写现有DataFrame的步骤＆＃34; df＆＃34;进入MySQL表说＆＃34; product_mysql＆＃34;而另一种方式。

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)