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Developing Persistence Architectures Using EclipseLink Database Web Services, Release 2.4
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Creating from a Stored Procedure with complex PL/SQL arguments

With EclipseLink, you can create a DBWS web service from a stored procedure that uses complex PL/SQL types as either an IN, OUT, or IN OUT argument.

Example

In this example, the following stored procedure is used:

PROCEDURE P1(OLDREC IN ARECORD, FOO IN VARCHAR2, AREC OUT ARECORD) IS  BEGIN    AREC.T1 := ... some processing based upon OLDREC    AREC.T2 := ... AND FOO    AREC.T3 := ...  END P1;
 

Type ARECORD is defined in the PL/SQL package SOMEPACKAGE as follows:

CREATE OR REPLACE PACKAGE SOMEPACKAGE AS
  TYPE TBL1 IS TABLE OF VARCHAR2(111) INDEX BY BINARY_INTEGER;
  TYPE TBL2 IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
  TYPE ARECORD IS RECORD (
    T1 TBL1,
    T2 TBL2,
    T3 BOOLEAN
  );
  PROCEDURE P1(OLDREC IN ARECORD, FOO IN VARCHAR2, AREC OUT ARECORD);
END SOMEPACKAGE;

Because PL/SQL record and collection types cannot be transported via JDBC, EclipseLink will generate an anonymous block of PL/SQL code that contains the functions to convert to and from JDBC and PL/SQl types. To be successful, each PL/SQL type or collection type that will appear in an IN, IN OUT, or OUT OF RETURN argument (or any PL/SQL record or collection type that is nested within these arguments) must have an equivalent JDBC type. The name of this type must be in the form <package name>_<type name>.

For this example, the following JDBC types are required:

CREATE OR REPLACE TYPE SOMEPACKAGE_TBL1 AS TABLE OF VARCHAR2(111)
 
CREATE OR REPLACE TYPE SOMEPACKAGE_TBL2 AS TABLE OF NUMBER
 
CREATE OR REPLACE TYPE SOMEPACKAGE_ARECORD AS OBJECT (
  T1 SOMEPACKAGE_TBL1,
  T2 SOMEPACKAGE_TBL2,
  T3 BOOLEAN
)

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">testPLSQLProcedure</property>
    ... database properties
  </properties>
  <plsql-procedure
    name="plsqlprocedure"
    catalogPattern="SOMEPACKAGE"
    procedurePattern="P1"
  />
</dbws-builder>

Notice that returnType is set to SOMEPACKAGE_ARECORD. This value indicates a complex type in the generated EclipseLink DBWS schema (as shown below). In this case, it is constructed based on the contents of the SOMEPACKAGE package.

Execute the DBWSBuilder, as shown here:

prompt > dbwsbuilder.cmd -builderFile dbws-builder.xml -stageDir output_directory -packageAs wls testPLSQLProcedure.war

where

  • dbws-builder.xml is the DBWS builder configuration file (as shown previously).

  • output_directory is the output directory for the generated files.

  • -packageAs is the platform on which the web service will be deployed.

The generated eclipselink-dbws-schema.xsd file follows:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:plsqlprocedure" xmlns="urn:plsqlprocedure" 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="SOMEPACKAGE_TBL2">
      <xsd:sequence>
         <xsd:element name="item" type="xsd:decimal" maxOccurs="unbounded" nillable="true"/>
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="SOMEPACKAGE_ARECORD">
      <xsd:sequence>
         <xsd:element name="t1">
            <xsd:complexType>
               <xsd:sequence>
                  <xsd:element name="item" type="xsd:string" maxOccurs="unbounded" nillable="true"/>
               </xsd:sequence>
            </xsd:complexType>
         </xsd:element>
         <xsd:element name="t2">
            <xsd:complexType>
               <xsd:sequence>
                  <xsd:element name="item" type="xsd:decimal" maxOccurs="unbounded" nillable="true"/>
               </xsd:sequence>
            </xsd:complexType>
         </xsd:element>
         <xsd:element name="t3" type="xsd:boolean" 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:element name="SOMEPACKAGE_TBL2" type="SOMEPACKAGE_TBL2"/>
   <xsd:element name="SOMEPACKAGE_ARECORD" type="SOMEPACKAGE_ARECORD"/>
</xsd:schema>
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