编写Scala工程代码,将MySQL的db库中表table1、table2、table3、table4、 table5、table6、table7、table8、table9、table10、table11 的数据增量抽 取到 Hive 的 ods 库中对应表 table1、table2、table3、table4、table5、table6、 table7、table8、table9、table10、table11 中
时间: 2023-06-14 16:05:42 浏览: 244
以下是Scala的代码示例:
```scala
import org.apache.spark.sql.SparkSession
object MySQLToHiveIncremental {
def main(args: Array[String]): Unit = {
// Initialize SparkSession
val spark = SparkSession.builder()
.appName("MySQLToHiveIncremental")
.enableHiveSupport()
.getOrCreate()
// Set MySQL and Hive configurations
val mysqlUrl = "jdbc:mysql://localhost:3306/db"
val mysqlUser = "username"
val mysqlPassword = "password"
val hiveDatabase = "ods"
// Define tables to extract and load
val tables = List("table1", "table2", "table3", "table4", "table5", "table6", "table7", "table8", "table9", "table10", "table11")
// Loop through tables and extract data from MySQL
tables.foreach(table => {
// Load data from MySQL
val mysqlDf = spark.read.format("jdbc")
.option("url", mysqlUrl)
.option("user", mysqlUser)
.option("password", mysqlPassword)
.option("dbtable", table)
.load()
// Load data from Hive
val hiveDf = spark.table(s"$hiveDatabase.$table")
// Identify new records to insert into Hive
val newRecords = mysqlDf.except(hiveDf)
// Insert new records into Hive
newRecords.write.mode("append").insertInto(s"$hiveDatabase.$table")
})
// Stop SparkSession
spark.stop()
}
}
```
该代码使用SparkSession连接MySQL和Hive,然后循环遍历要抽取的表格列表。对于每个表格,它从MySQL中加载数据,然后从Hive中加载数据。接下来,它识别要插入到Hive中的新记录,并将这些记录插入到Hive中。最后,它停止SparkSession。
阅读全文