09 spark连接mysql数据库

Posted 2021-05-29 会喷水的海参

spark连接mysql数据库

安装启动检查mysql服务。

spark 连接mysql驱动程序。

pyspark \\
--jars /usr/local/spark/jars/mysql-connector-java-8.0.25.jar \\
--driver-class-path /usr/local/spark/jars/mysql-connector-java-8.0.25.jar

启动 Mysql shell，新建数据库spark，表student。

create database spark;
use spark;
create table student (id int(4), name char(20), gender char(4), age int(4));
alter table student change id id int auto_increment primary key;
insert into student values(1,\'Xueqian\',\'F\',23);
insert into student values(2,\'Weiliang\',\'M\',24);
select * from student;

spark读取MySQL数据库中的数据

jdbcDF = spark.read.format("jdbc").option("url", "jdbc:mysql://localhost:3306/spark").option("driver","com.mysql.jdbc.Driver").option("dbtable", "student").option("user", "root").option("password", "123456").load()
jdbcDF.show()

spark向MySQL数据库写入数据

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 Rongcheng M 26","4 Guanhua M 27"]).map(lambda line : line.split(" "))
//下面要设置模式信息
schema = StructType([StructField("name", StringType(), True),StructField("gender", StringType(), True),StructField("age",IntegerType(), True)])
rowRDD = studentRDD.map(lambda p : Row(p[1].strip(), p[2].strip(),int(p[3])))
//建立起Row对象和模式之间的对应关系，也就是把数据和模式对应起来
studentDF = spark.createDataFrame(rowRDD, schema)
prop = {}
prop[\'user\'] = \'root\'
prop[\'password\'] = \'hadoop\'
prop[\'driver\'] = "com.mysql.jdbc.Driver"
studentDF.write.jdbc("jdbc:mysql://localhost:3306/spark",\'student\',\'append\', prop)

select * from student;