示例代碼如下。

val input = getSparkContext.textFile(inputPath, numPartitions)
    input.flatMap(_.split(" ")).map(x => (x, 1)).reduceByKey(_ + _)
      .mapPartitions(e => {
        var conn: Connection = null
        var ps: PreparedStatement = null
        val sql = s"insert into $tbName(word, count) values (?, ?)"
        try {
          conn = DriverManager.getConnection(s"jdbc:mysql://$dbUrl:$dbPort/$dbName", dbUser, dbPwd)
          ps = conn.prepareStatement(sql)
          e.foreach(pair => {
            ps.setString(1, pair._1)
            ps.setLong(2, pair._2)
            ps.executeUpdate()
          })

          ps.close()
          conn.close()
        } catch {
          case e: Exception => e.printStackTrace()
        } finally {
          if (ps != null) {
            ps.close()
          }
          if (conn != null) {
            conn.close()
          }
        }
      Iterator.empty
    }).count()

訪問命令如下。

spark-sql --jars /opt/apps/SPARK-EXTENSION/spark-extension-current/spark3-emrsdk/*,mysql-connector-java-8.0.30.jar 

建表和讀取數據示例如下。

//建表
create table test1(id int)
using jdbc2
options(
  url="jdbc:mysql://mysql_url/test_db?user=root&password=root",
  dbtable="test1",
  driver="com.mysql.jdbc.Driver");

//讀取MySQL
select * from test1;

//寫入MySQL
insert into test1 values(1);