"How to get number of ExampleSet after Read Database"

thomas_wiedmannthomas_wiedmann Member Posts: 60 Guru
edited June 2019 in Help

Is there any way to get the number of rows (ExampleSet) from every "Read Database" inside a information value to work with?

I need to know how many rows come from every "Read Database" Query.








Best Answer

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    lionelderkrikorlionelderkrikor Moderator, RapidMiner Certified Analyst, Member Posts: 1,195 Unicorn
    Solution Accepted

    Hi @thomas_wiedmann,


    Here an example of process (to adapt to your own project) to get the number of rows of an exampleset : 


    <?xml version="1.0" encoding="UTF-8"?><process version="8.1.001">
    <operator activated="true" class="process" compatibility="6.0.002" expanded="true" name="Process">
    <process expanded="true">
    <operator activated="true" breakpoints="after" class="retrieve" compatibility="8.1.001" expanded="true" height="68" name="Golf" width="90" x="112" y="120">
    <parameter key="repository_entry" value="//Samples/data/Golf"/>
    <operator activated="true" class="extract_macro" compatibility="8.1.001" expanded="true" height="68" name="Extract Macro" width="90" x="246" y="120">
    <parameter key="macro" value="eCount"/>
    <list key="additional_macros"/>
    <operator activated="true" class="provide_macro_as_log_value" compatibility="8.1.001" expanded="true" height="82" name="Provide Macro as Log Value" width="90" x="380" y="120">
    <parameter key="macro_name" value="eCount"/>
    <operator activated="true" class="log" compatibility="8.1.001" expanded="true" height="82" name="Log" width="90" x="514" y="136">
    <list key="log">
    <parameter key="Direct" value="operator.Extract Macro.value.macro_value"/>
    <parameter key="Indirect" value="operator.Provide Macro as Log Value.value.macro_value"/>
    <connect from_op="Golf" from_port="output" to_op="Extract Macro" to_port="example set"/>
    <connect from_op="Extract Macro" from_port="example set" to_op="Provide Macro as Log Value" to_port="through 1"/>
    <connect from_op="Provide Macro as Log Value" from_port="through 1" to_op="Log" to_port="through 1"/>
    <connect from_op="Log" from_port="through 1" to_port="result 1"/>
    <portSpacing port="source_input 1" spacing="0"/>
    <portSpacing port="sink_result 1" spacing="90"/>
    <portSpacing port="sink_result 2" spacing="0"/>

    Does this solution answer to your need ?







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