Create Data Service with inner join - wso2

Question

I'm trying to create a service with an inner join query but it returns this error:
org.postgresql.util.PSQLException: A result was returned when none was expected.
This is my service:
<data name="consultarPersona" transports="http https local">
<config enableOData="true" id="mi_datasource">
<property name="carbon_datasource_name">fuente_datos</property>
</config>
<query id="contactos_registrados" useConfig="mi_datasource">
<sql>select * from t_contacto inner join t_datos_contacto on t_contacto.id = t_datos_contacto.id</sql>
</query>
<operation name="obtenerDatosContactos">
<call-query href="contactos_registrados"/>
</operation>
</data>

Answer 1

You should specify which columns do you want to return and generate the response, the result is an service like this:
<data name="consultarPersona" transports="http https local">
<config enableOData="true" id="mi_datasource">
<property name="carbon_datasource_name">fuente_datos</property>
</config>
<query id="contactos_registrados" useConfig="mi_datasource">
<sql>select name, age from t_contacto inner join t_datos_contacto on t_contacto.id = t_datos_contacto.id</sql>
<result element="contactoCollection" rowName="contacto">
<element column="name" name="name" xsdType="xs:string"/>
<element column="age" name="age" xsdType="xs:string"/>
</result>
</query>
<operation name="obtenerDatosContactos">
<call-query href="contactos_registrados"/>
</operation>
</data>
I hope this coudl help you.