org.apache.flink.api.java.io.jdbc.split

Class NumericBetweenParametersProvider

java.lang.Object

org.apache.flink.api.java.io.jdbc.split.NumericBetweenParametersProvider

All Implemented Interfaces:

ParameterValuesProvider

public class NumericBetweenParametersProvider
extends Object
implements ParameterValuesProvider

This query generator assumes that the query to parameterize contains a BETWEEN constraint on a numeric column. The generated query set will be of size equal to the configured fetchSize (apart the last one range), ranging from the min value up to the max. For example, if there's a table BOOKS with a numeric PK id, using a query like:

   SELECT * FROM BOOKS WHERE id BETWEEN ? AND ?
 

you can use this class to automatically generate the parameters of the BETWEEN clause, based on the passed constructor parameters.

Constructor Summary

Constructors

Constructor and Description
NumericBetweenParametersProvider(long fetchSize, long min, long max)

Method Summary

Modifier and Type	Method and Description
Serializable[][]	getParameterValues() Returns the necessary parameters array to use for query in parallel a table

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NumericBetweenParametersProvider

public NumericBetweenParametersProvider(long fetchSize,
                                        long min,
                                        long max)

Method Detail

getParameterValues

public Serializable[][] getParameterValues()

Description copied from interface: ParameterValuesProvider

Returns the necessary parameters array to use for query in parallel a table

Specified by:

getParameterValues in interface ParameterValuesProvider