09 spark连接mysql数据库

1. 安装启动检查Mysql服务。
##netstat -tunlp (3306)

cd /usr/local/hive/lib

ls mysql*

cp mysql-connector-java-5.1.40-bin.jar /usr/local/spark/jars/

cd /usr/local/spark/jars/

ls mysql*

netstat -tunpl

2. spark 连接mysql驱动程序。
##–cp /usr/local/hive/lib/mysql-connector-java-5.1.40-bin.jar /usr/local/spark/jars

3.  启动 Mysql shell，新建数据库spark，表student。
create database spark;#创建数据库

use spark;#使用数据库

create table student(id int(4),name char(20),gender char(4),age int (4));#创建表

insert into student values(1,'Xueqian','F',23);

insert into student values(2,'Weiliang','M',24);#插入两条数据

select * from student;#查询数据

4. spark读取MySQL数据库中的数据

##spark.read.format("jdbc").option("url", "jdbc:mysql://localhost:3306/spark?useSSL=false") ...  .load()

jdbcDF=spark.read.format("jdbc")\
... .option("driver","com.mysql.jdbc.Driver")\
... .option("url","jdbc:mysql://localhost:3306/spark?useSSL=false")\
... .option("dbtable","student")\
... .option("user","root")\
... .option("password","hadoop")\
... .load()
jdbcDF.show()

5. spark向MySQL数据库写入数据
##studentDF.write.format(‘jdbc’).option(…).mode(‘append’).save() 

>>> from pyspark.sql.types import Row
>>> from pyspark.sql.types import StructType
>>> from pyspark.sql.types import StructField
>>> from pyspark.sql.types import StringType

>>> from pyspark.sql.types import IntegerType

>>> studentRDD = spark.sparkContext.parallelize(["3 zhao M 26","4 wang M 27"]).map(lambda line:line.split(" "))
>>> rowRDD = studentRDD.map(lambda p:Row(p[1].strip(),p[2].strip(),int(p[3])))
>>> schema = StructType([StructField("name",StringType(),True),StructField("gender",StringType(),True),StructField("age",IntegerType(),True)])
>>> studentDF=spark.createDataFrame(rowRDD,schema)

>>> prop={}
>>> prop['user']='root'
>>> prop['password']='123456'

>>> prop['driver']='com.mysql.jdbc.Driver'

>>> studentDF.write.jdbc("jdbc:mysql://localhost:3306/spark?useSSL=false",'student','append',prop)