def jdbc(self, url, table, mode="error", properties={}):
"""
Saves the content of the :class:`DataFrame` to a external database table
via JDBC.
In the case the table already exists in the external database,
behavior of this function depends on the save mode, specified by the `mode`
function (default to throwing an exception). There are four modes:
* `append`: Append contents of this :class:`DataFrame` to existing data.
* `overwrite`: Overwrite existing data.
* `error`: Throw an exception if data already exists.
* `ignore`: Silently ignore this operation if data already exists.
:param url: a JDBC URL of the form `jdbc:subprotocol:subname`
:param table: Name of the table in the external database.
:param mode: one of `append`, `overwrite`, `error`, `ignore` (default: error)
:param properties: JDBC database connection arguments, a list of
arbitrary string tag/value. Normally at least a
"user" and "password" property should be included.
"""
jprop = JavaClass("java.util.Properties",
self._sqlContext._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self._jwrite.mode(mode).jdbc(url, table, jprop)
def jdbc(self, url, table, mode=None, properties=None):
"""Saves the content of the :class:`DataFrame` to an external database table via JDBC.
.. note:: Don't create too many partitions in parallel on a large cluster; \
otherwise Spark might crash your external database systems.
:param url: a JDBC URL of the form ``jdbc:subprotocol:subname``
:param table: Name of the table in the external database.
:param mode: specifies the behavior of the save operation when data already exists.
* ``append``: Append contents of this :class:`DataFrame` to existing data.
* ``overwrite``: Overwrite existing data.
* ``ignore``: Silently ignore this operation if data already exists.
* ``error`` (default case): Throw an exception if data already exists.
:param properties: a dictionary of JDBC database connection arguments. Normally at
least properties "user" and "password" with their corresponding values.
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties",
self._spark._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self._jwrite.mode(mode).jdbc(url, table, jprop)
def jdbc(self, url, table, mode=None, properties=None):
"""Saves the content of the :class:`DataFrame` to an external database table via JDBC.
.. note:: Don't create too many partitions in parallel on a large cluster; \
otherwise Spark might crash your external database systems.
:param url: a JDBC URL of the form ``jdbc:subprotocol:subname``
:param table: Name of the table in the external database.
:param mode: specifies the behavior of the save operation when data already exists.
* ``append``: Append contents of this :class:`DataFrame` to existing data.
* ``overwrite``: Overwrite existing data.
* ``ignore``: Silently ignore this operation if data already exists.
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
exists.
:param properties: a dictionary of JDBC database connection arguments. Normally at
least properties "user" and "password" with their corresponding values.
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties", self._spark._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self.mode(mode)._jwrite.jdbc(url, table, jprop)
def jdbc(self, url, table, mode="error", properties={}):
"""
Saves the content of the :class:`DataFrame` to a external database table
via JDBC.
In the case the table already exists in the external database,
behavior of this function depends on the save mode, specified by the `mode`
function (default to throwing an exception). There are four modes:
* `append`: Append contents of this :class:`DataFrame` to existing data.
* `overwrite`: Overwrite existing data.
* `error`: Throw an exception if data already exists.
* `ignore`: Silently ignore this operation if data already exists.
:param url: a JDBC URL of the form `jdbc:subprotocol:subname`
:param table: Name of the table in the external database.
:param mode: one of `append`, `overwrite`, `error`, `ignore` (default: error)
:param properties: JDBC database connection arguments, a list of
arbitrary string tag/value. Normally at least a
"user" and "password" property should be included.
"""
jprop = JavaClass("java.util.Properties", self._sqlContext._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self._jwrite.mode(mode).jdbc(url, table, jprop)
def jdbc(self,
url,
table,
column=None,
lowerBound=None,
upperBound=None,
numPartitions=None,
predicates=None,
properties=None):
"""
Construct a :class:`DataFrame` representing the database table named ``table``
accessible via JDBC URL ``url`` and connection ``properties``.
Partitions of the table will be retrieved in parallel if either ``column`` or
``predicates`` is specified. ``lowerBound`, ``upperBound`` and ``numPartitions``
is needed when ``column`` is specified.
If both ``column`` and ``predicates`` are specified, ``column`` will be used.
.. note:: Don't create too many partitions in parallel on a large cluster; \
otherwise Spark might crash your external database systems.
:param url: a JDBC URL of the form ``jdbc:subprotocol:subname``
:param table: the name of the table
:param column: the name of an integer column that will be used for partitioning;
if this parameter is specified, then ``numPartitions``, ``lowerBound``
(inclusive), and ``upperBound`` (exclusive) will form partition strides
for generated WHERE clause expressions used to split the column
``column`` evenly
:param lowerBound: the minimum value of ``column`` used to decide partition stride
:param upperBound: the maximum value of ``column`` used to decide partition stride
:param numPartitions: the number of partitions
:param predicates: a list of expressions suitable for inclusion in WHERE clauses;
each one defines one partition of the :class:`DataFrame`
:param properties: a dictionary of JDBC database connection arguments. Normally at
least properties "user" and "password" with their corresponding values.
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
:return: a DataFrame
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties",
self._spark._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
if column is not None:
assert lowerBound is not None, "lowerBound can not be None when ``column`` is specified"
assert upperBound is not None, "upperBound can not be None when ``column`` is specified"
assert numPartitions is not None, \
"numPartitions can not be None when ``column`` is specified"
return self._df(
self._jreader.jdbc(url, table, column, int(lowerBound),
int(upperBound), int(numPartitions), jprop))
if predicates is not None:
gateway = self._spark._sc._gateway
jpredicates = utils.toJArray(gateway, gateway.jvm.java.lang.String,
predicates)
return self._df(self._jreader.jdbc(url, table, jpredicates, jprop))
return self._df(self._jreader.jdbc(url, table, jprop))
def jdbc(
self,
url,
table,
column=None,
lowerBound=None,
upperBound=None,
numPartitions=None,
predicates=None,
properties=None,
):
"""
Construct a :class:`DataFrame` representing the database table named ``table``
accessible via JDBC URL ``url`` and connection ``properties``.
Partitions of the table will be retrieved in parallel if either ``column`` or
``predicates`` is specified.
If both ``column`` and ``predicates`` are specified, ``column`` will be used.
.. note:: Don't create too many partitions in parallel on a large cluster; \
otherwise Spark might crash your external database systems.
:param url: a JDBC URL of the form ``jdbc:subprotocol:subname``
:param table: the name of the table
:param column: the name of an integer column that will be used for partitioning;
if this parameter is specified, then ``numPartitions``, ``lowerBound``
(inclusive), and ``upperBound`` (exclusive) will form partition strides
for generated WHERE clause expressions used to split the column
``column`` evenly
:param lowerBound: the minimum value of ``column`` used to decide partition stride
:param upperBound: the maximum value of ``column`` used to decide partition stride
:param numPartitions: the number of partitions
:param predicates: a list of expressions suitable for inclusion in WHERE clauses;
each one defines one partition of the :class:`DataFrame`
:param properties: a dictionary of JDBC database connection arguments. Normally at
least properties "user" and "password" with their corresponding values.
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
:return: a DataFrame
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties", self._spark._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
if column is not None:
if numPartitions is None:
numPartitions = self._spark._sc.defaultParallelism
return self._df(
self._jreader.jdbc(url, table, column, int(lowerBound), int(upperBound), int(numPartitions), jprop)
)
if predicates is not None:
gateway = self._spark._sc._gateway
jpredicates = utils.toJArray(gateway, gateway.jvm.java.lang.String, predicates)
return self._df(self._jreader.jdbc(url, table, jpredicates, jprop))
return self._df(self._jreader.jdbc(url, table, jprop))
def jdbc(self,
url,
table,
column=None,
lowerBound=None,
upperBound=None,
numPartitions=None,
predicates=None,
properties=None):
"""
Construct a :class:`DataFrame` representing the database table accessible
via JDBC URL `url` named `table` and connection `properties`.
The `column` parameter could be used to partition the table, then it will
be retrieved in parallel based on the parameters passed to this function.
The `predicates` parameter gives a list expressions suitable for inclusion
in WHERE clauses; each one defines one partition of the :class:`DataFrame`.
::Note: Don't create too many partitions in parallel on a large cluster;
otherwise Spark might crash your external database systems.
:param url: a JDBC URL
:param table: name of table
:param column: the column used to partition
:param lowerBound: the lower bound of partition column
:param upperBound: the upper bound of the partition column
:param numPartitions: the number of partitions
:param predicates: a list of expressions
:param properties: JDBC database connection arguments, a list of arbitrary string
tag/value. Normally at least a "user" and "password" property
should be included.
:return: a DataFrame
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties",
self._sqlContext._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
if column is not None:
if numPartitions is None:
numPartitions = self._sqlContext._sc.defaultParallelism
return self._df(
self._jreader.jdbc(url, table, column, int(lowerBound),
int(upperBound), int(numPartitions), jprop))
if predicates is not None:
gateway = self._sqlContext._sc._gateway
jpredicates = utils.toJArray(gateway, gateway.jvm.java.lang.String,
predicates)
return self._df(self._jreader.jdbc(url, table, jpredicates, jprop))
return self._df(self._jreader.jdbc(url, table, jprop))
def jdbc(
self,
url,
table,
column=None,
lowerBound=None,
upperBound=None,
numPartitions=None,
predicates=None,
properties=None,
):
"""
Construct a :class:`DataFrame` representing the database table accessible
via JDBC URL `url` named `table` and connection `properties`.
The `column` parameter could be used to partition the table, then it will
be retrieved in parallel based on the parameters passed to this function.
The `predicates` parameter gives a list expressions suitable for inclusion
in WHERE clauses; each one defines one partition of the :class:`DataFrame`.
::Note: Don't create too many partitions in parallel on a large cluster;
otherwise Spark might crash your external database systems.
:param url: a JDBC URL
:param table: name of table
:param column: the column used to partition
:param lowerBound: the lower bound of partition column
:param upperBound: the upper bound of the partition column
:param numPartitions: the number of partitions
:param predicates: a list of expressions
:param properties: JDBC database connection arguments, a list of arbitrary string
tag/value. Normally at least a "user" and "password" property
should be included.
:return: a DataFrame
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties", self._sqlContext._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
if column is not None:
if numPartitions is None:
numPartitions = self._sqlContext._sc.defaultParallelism
return self._df(
self._jreader.jdbc(url, table, column, int(lowerBound), int(upperBound), int(numPartitions), jprop)
)
if predicates is not None:
gateway = self._sqlContext._sc._gateway
jpredicates = utils.toJArray(gateway, gateway.jvm.java.lang.String, predicates)
return self._df(self._jreader.jdbc(url, table, jpredicates, jprop))
return self._df(self._jreader.jdbc(url, table, jprop))
def jdbc(self, url, table, mode=None, properties=None):
"""Saves the content of the :class:`DataFrame` to an external database table via JDBC.
.. versionadded:: 1.4.0
Parameters
----------
table : str
Name of the table in the external database.
mode : str, optional
specifies the behavior of the save operation when data already exists.
* ``append``: Append contents of this :class:`DataFrame` to existing data.
* ``overwrite``: Overwrite existing data.
* ``ignore``: Silently ignore this operation if data already exists.
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
exists.
properties : dict
a dictionary of JDBC database connection arguments. Normally at
least properties "user" and "password" with their corresponding values.
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
Other Parameters
----------------
Extra options
For the extra options, refer to
`Data Source Option <https://spark.apache.org/docs/latest/sql-data-sources-jdbc.html#data-source-option>`_
in the version you use.
.. # noqa
Notes
-----
Don't create too many partitions in parallel on a large cluster;
otherwise Spark might crash your external database systems.
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties",
self._spark._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self.mode(mode)._jwrite.jdbc(url, table, jprop)
def jdbc(self, url, table, mode=None, properties={}):
"""Saves the content of the :class:`DataFrame` to a external database table via JDBC.
.. note:: Don't create too many partitions in parallel on a large cluster;\
otherwise Spark might crash your external database systems.
:param url: a JDBC URL of the form ``jdbc:subprotocol:subname``
:param table: Name of the table in the external database.
:param mode: specifies the behavior of the save operation when data already exists.
* ``append``: Append contents of this :class:`DataFrame` to existing data.
* ``overwrite``: Overwrite existing data.
* ``ignore``: Silently ignore this operation if data already exists.
* ``error`` (default case): Throw an exception if data already exists.
:param properties: JDBC database connection arguments, a list of
arbitrary string tag/value. Normally at least a
"user" and "password" property should be included.
"""
jprop = JavaClass("java.util.Properties", self._sqlContext._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self._jwrite.mode(mode).jdbc(url, table, jprop)
def jdbc(self, url, table, mode=None, properties={}):
"""Saves the content of the :class:`DataFrame` to a external database table via JDBC.
.. note:: Don't create too many partitions in parallel on a large cluster;\
otherwise Spark might crash your external database systems.
:param url: a JDBC URL of the form ``jdbc:subprotocol:subname``
:param table: Name of the table in the external database.
:param mode: specifies the behavior of the save operation when data already exists.
* ``append``: Append contents of this :class:`DataFrame` to existing data.
* ``overwrite``: Overwrite existing data.
* ``ignore``: Silently ignore this operation if data already exists.
* ``error`` (default case): Throw an exception if data already exists.
:param properties: JDBC database connection arguments, a list of
arbitrary string tag/value. Normally at least a
"user" and "password" property should be included.
"""
jprop = JavaClass("java.util.Properties", self._sqlContext._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
self._jwrite.mode(mode).jdbc(url, table, jprop)
def jdbc(self,
url,
table,
column=None,
lowerBound=None,
upperBound=None,
numPartitions=None,
predicates=None,
properties=None):
"""
Construct a :class:`DataFrame` representing the database table named ``table``
accessible via JDBC URL ``url`` and connection ``properties``.
Partitions of the table will be retrieved in parallel if either ``column`` or
``predicates`` is specified. ``lowerBound``, ``upperBound`` and ``numPartitions``
is needed when ``column`` is specified.
If both ``column`` and ``predicates`` are specified, ``column`` will be used.
.. versionadded:: 1.4.0
Parameters
----------
table : str
the name of the table
column : str, optional
alias of ``partitionColumn`` option. Refer to ``partitionColumn`` in
`Data Source Option <https://spark.apache.org/docs/latest/sql-data-sources-jdbc.html#data-source-option>`_
in the version you use.
predicates : list, optional
a list of expressions suitable for inclusion in WHERE clauses;
each one defines one partition of the :class:`DataFrame`
properties : dict, optional
a dictionary of JDBC database connection arguments. Normally at
least properties "user" and "password" with their corresponding values.
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
Other Parameters
----------------
Extra options
For the extra options, refer to
`Data Source Option <https://spark.apache.org/docs/latest/sql-data-sources-jdbc.html#data-source-option>`_
in the version you use.
.. # noqa
Notes
-----
Don't create too many partitions in parallel on a large cluster;
otherwise Spark might crash your external database systems.
Returns
-------
:class:`DataFrame`
"""
if properties is None:
properties = dict()
jprop = JavaClass("java.util.Properties",
self._spark._sc._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
if column is not None:
assert lowerBound is not None, "lowerBound can not be None when ``column`` is specified"
assert upperBound is not None, "upperBound can not be None when ``column`` is specified"
assert numPartitions is not None, \
"numPartitions can not be None when ``column`` is specified"
return self._df(
self._jreader.jdbc(url, table, column, int(lowerBound),
int(upperBound), int(numPartitions), jprop))
if predicates is not None:
gateway = self._spark._sc._gateway
jpredicates = utils.toJArray(gateway, gateway.jvm.java.lang.String,
predicates)
return self._df(self._jreader.jdbc(url, table, jpredicates, jprop))
return self._df(self._jreader.jdbc(url, table, jprop))
import sys
import os
import uuid
if __name__ == "__main__":
print("*" * 80)
spark = SparkSession.builder.appName(
"PySpark Predix Eventhub basic read example").config(
"spark.some.config.option", "some-value").getOrCreate()
sqlContext = SQLContext(spark)
sparkContext = spark.sparkContext
properties = json.load(open('predix-eventhub-read-example.properties'))
jprop = JavaClass("java.util.Properties",
sparkContext._gateway._gateway_client)()
for k in properties:
jprop.setProperty(k, properties[k])
javaEventHubReceiver = JavaClass(
"com.ge.predix.arf.connector.rtcommon.stream.JavaEventHubReceiver",
sparkContext._gateway._gateway_client)(jprop)
durationObject = JavaClass("org.apache.spark.streaming.Duration",
sparkContext._gateway._gateway_client)(1000)
jssc = JavaClass(
"org.apache.spark.streaming.api.java.JavaStreamingContext",
sparkContext._gateway._gateway_client)(sparkContext._jsc,
durationObject)
jreceiver = jssc.receiverStream(javaEventHubReceiver)
transformerObject = JavaClass(
"com.ge.predix.arf.connector.stream.StreamTSTransformerObject",
sparkContext._gateway._gateway_client)
transformFunc = transformerObject.transformShowCallBackFunction()