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EclipseLink/Examples/DBWS/DBWSOverloadStoredProcedure


EclipseLink DBWS Service based on an overloaded PL/SQL Stored Procedure

The use-case for this example is the creation of a Web service that exposes a PL/SQL Stored Procedure (or multiple procedures). From the metadata for a Stored Procedure, it is not possible to determine the structure of the returned data. Therefore, the Simple XML Format schema is used. The EclipseLink DBWS runtime produces an XML document that is simple and 'human-readable'. Any combination of IN, OUT and IN OUT arguments are supported; in addition, procedures in packages that are overloaded - same name, different parameters – are supported.

The following PL/SQL stored procedures will be used for this example:
CREATE PROCEDURE P1(SIMPLARRAY IN TBL1, FOO IN VARCHAR2) AS
BEGIN
  // do something
END P1;

CREATE PROCEDURE P1(SIMPLARRAY IN TBL1, FOO IN VARCHAR2, BAR IN VARCHAR2) AS
BEGIN
  // do something
END P1;
Type TBL1 is defined in PL/SQL Package SOMEPACKAGE as follows:
CREATE OR REPLACE PACKAGE SOMEPACKAGE AS
  TYPE TBL1 IS TABLE OF VARCHAR2(111) INDEX BY BINARY_INTEGER;
  PROCEDURE P7(SIMPLARRAY IN TBL1, FOO IN VARCHAR2);
  PROCEDURE P7(SIMPLARRAY IN TBL1, FOO IN VARCHAR2, BAR IN VARCHAR2);
END SOMEPACKAGE;

The DBWSBuilder utility requires a DBWS configuration file as input.

<?xml version="1.0" encoding="UTF-8"?>
<dbws-builder xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <properties>
    <property name="projectName">testOverloadedProcedure</property>
    ... database properties
  </properties>
  <plsql-procedure
   name="overloadedProcedure"
   catalogPattern="SOMEPACKAGE"
   procedurePattern="P1"
 />
</dbws-builder>
prompt > dbwsbuilder.cmd -builderFile dbws-builder.xml -stageDir output_directory -packageAs wls testEcho.war

where

  • dbws-builder.xml is the DBWS builder XML file above
  • output_directory is the output directory for the generated files
  • -packageAs specifies the platform on which the web service will be deployed
The generated eclipselink-dbws-schema.xsd follows:
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:plsqloverload" xmlns="urn:plsqloverload" elementFormDefault="qualified">
   <xsd:complexType name="SOMEPACKAGE_TBL1">
      <xsd:sequence>
         <xsd:element name="item" type="xsd:string" maxOccurs="unbounded" nillable="true"/>
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="simple-xml-format">
      <xsd:sequence>
         <xsd:any minOccurs="0"/>
      </xsd:sequence>
   </xsd:complexType>
   <xsd:element name="SOMEPACKAGE_TBL1" type="SOMEPACKAGE_TBL1"/>
</xsd:schema>