sparksql读取mysql表的两种方式

Bertha 。 2023-02-27 05:40 27阅读 0赞

**一、mysql数据表及数据**

mysql> use test;
    Reading table information for completion of table and column names
    You can turn off this feature to get a quicker startup with -A
    
    Database changed
    mysql> show tables;
    +----------------+
    | Tables_in_test |
    +----------------+
    | stu            |
    | walk_info      |
    +----------------+
    2 rows in set (0.00 sec)
    
    mysql> select * from walk_info
        -> ;
    +-----------+---------------------+-----------------+------------+
    | user      | counttime           | walkplace       | newwalknum |
    +-----------+---------------------+-----------------+------------+
    | zhangSan  | 2020-07-02 13:44:43 | 操场西南门      |          1 |
    | liSi      | 2020-07-02 13:44:45 | 操场西南门      |          3 |
    | wangWu    | 2020-07-02 13:44:47 | 操场东北门      |          3 |
    | xiaoQiang | 2020-07-02 13:44:49 | 操场西北门      |          2 |
    | zhangSan  | 2020-07-02 13:44:51 | 操场西门        |          3 |
    | liSi      | 2020-07-02 13:44:53 | 操场东南门      |          1 |
    | wangWu    | 2020-07-02 13:44:55 | 操场东南门      |          3 |
    | xiaoQiang | 2020-07-02 13:44:57 | 操场西门        |          1 |
    | zhangSan  | 2020-07-02 13:44:59 | 操场北门        |          1 |
    +-----------+---------------------+-----------------+------------+
    9 rows in set (0.01 sec)

二、**spark.read.jdbc()的方式**

package com.cn.sparkSql
    
    import java.util.Properties
    
    import org.apache.spark.sql.SparkSession
    
    object Sparksql_mysql {
      def main(args: Array[String]): Unit = {
        val spark: SparkSession = SparkSession
          .builder()
          .master("local[*]")
          .appName("toMysql")
          .getOrCreate()
       spark.sparkContext.setLogLevel("WARN")
        val properties = new Properties()
        properties.setProperty("user","root")
        properties.setProperty("password","123456")
        val url="jdbc:mysql://192.168.230.21:3306/test?characterEncoding=utf8&useSSL=true"
        spark.read.jdbc(url,"walk_info",properties)
          .select("user","counttime","walkplace","newwalknum")
          .where("newwalknum>1")
          .show()
        spark.stop()
      }
    }

**输出：**

.........
    20/07/16 13:41:01 INFO BlockManagerMaster: Registered BlockManager BlockManagerId(driver, 192.168.230.1, 56387, None)
    20/07/16 13:41:01 INFO BlockManager: Initialized BlockManager: BlockManagerId(driver, 192.168.230.1, 56387, None)
    +---------+-------------------+---------+----------+
    |     user|          counttime|walkplace|newwalknum|
    +---------+-------------------+---------+----------+
    |     liSi|2020-07-02 13:44:45|    操场西南门|         3|
    |   wangWu|2020-07-02 13:44:47|    操场东北门|         3|
    |xiaoQiang|2020-07-02 13:44:49|    操场西北门|         2|
    | zhangSan|2020-07-02 13:44:51|     操场西门|         3|
    |   wangWu|2020-07-02 13:44:55|    操场东南门|         3|
    +---------+-------------------+---------+----------+
    
    
    Process finished with exit code 0

三、**spark.read.format().option().load()的方式**

package com.cn.sparkSql
    
    import org.apache.spark.sql.{DataFrame, SparkSession}
    
    object sparkSqlToMysql {
      def main(args: Array[String]): Unit = {
        val spark: SparkSession = SparkSession
          .builder()
          .master("local[1]")
          .appName("toMysql")
          .getOrCreate()
        spark.sparkContext.setLogLevel("WARN")
        val df: DataFrame = spark.read.format("jdbc")
        //.option("driver", "com.mysql.jdbc.Driver") //mysql5版本以下
          .option("driver", "com.mysql.cj.jdbc.Driver") //mysql5版本以上
          .option("url", "jdbc:mysql://192.168.230.21:3306/test?characterEncoding=utf8&useSSL=true")
          .option("user", "root")
          .option("password", "123456")
          .option("dbtable", "walk_info")
          .load()
         df.createOrReplaceTempView("walkinfo")
        val sql="select * from walkinfo where newwalknum>1"
        spark.sql(sql).show()
        spark.stop()
      }
    }

**输出：**

20/07/16 13:42:02 INFO BlockManagerMaster: Registered BlockManager BlockManagerId(driver, 192.168.230.1, 56493, None)
    20/07/16 13:42:02 INFO BlockManager: Initialized BlockManager: BlockManagerId(driver, 192.168.230.1, 56493, None)
    +---------+-------------------+---------+----------+
    |     user|          counttime|walkplace|newwalknum|
    +---------+-------------------+---------+----------+
    |     liSi|2020-07-02 13:44:45|    操场西南门|         3|
    |   wangWu|2020-07-02 13:44:47|    操场东北门|         3|
    |xiaoQiang|2020-07-02 13:44:49|    操场西北门|         2|
    | zhangSan|2020-07-02 13:44:51|     操场西门|         3|
    |   wangWu|2020-07-02 13:44:55|    操场东南门|         3|
    +---------+-------------------+---------+----------+
    
    
    Process finished with exit code 0