If a class declares a static member variable, then the member functions cannot link to them

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• Dynamic variable in the class declaration?

  I googled this constantly but I can't find any syntax that helps with this issue.

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  I tried Googling table rating but I couldn't also everything that would help to find in the class declarations.

  
  Syntax for what I'm looking for?

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• pl/sql appellant java class member function obtains ora-00932 in 11g.

  Call a member function of class of java from a pl/sql script, I get an error ora-00932.

  ORA-00932: inconsistent data types: waiting for an IN argument in position 1 which is an instance of an O

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  (

  col1Data VARCHAR2 (10),

  MEMBER FUNCTION createData

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  NAME "java.lang.String return MyObject.createData ().

  );

  Java code:

  CREATE OR REPLACE AND FIX JAVA SOURCE NAMED 'MyObject' AS

  import java. IO;

  public class MyObject

  {

  private String col1Data;

  public void createData)

  {

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  }

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  Java function call vai pl/sql function:

  FUNCTION to CREATE or REPLACE fn_myobject

  (col1 IN varchar2)

  RETURN VARCHAR2

  AS

  p_rc varchar2 (100);

  myObj MyObject;

  BEGIN

  myObj: = new MyObject (col1);

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  RETURN p_rc;

  END;

  /

  And finally, the script from sqlplus to test:

  Set serverout

  call dbms_java.set_output (50);

  Set line 120

  declare

  VARCHAR2 (64) RC: = ";

  R1 varchar2 (64): = 'abc ';

  Start

  RC: = fn_myobject (r1);

  end;

  /

  I tried all sorts of things without success.   Any ideas on this would be most appreciated.  It is once again, 11g.

  Thank you.

  MarkF says:

  If you go back to the example code I posted, it is mapping a java class oracle object.

  No, it isn't.

  Your example simply sets an Oracle object type whose member createData function is implemented in Java.

  The fact that the implementing class has the same name does not have a direct mapping between the class and the type of Oracle.

  The important part to read and understand in the link I posted is:

  A call specification outlines the top level of an Oracle database Java method entry point. So, you can publish only public static methods.

  However, there is an exception. You can publish instance methods as members of an SQL object type methods.

  You are in the first case.

  To be in the exceptional cases and be able to publish instance methods, the Java class must implement SQLData.

  See the latest example here:

  https://docs.Oracle.com/database/121/JJDEV/chsix.htm#JJDEV13273

  Adapted to your example:

  CREATE OR REPLACE AND compile JAVA SOURCE NAMED "MyObject" AS
  import java.sql.*;
  
  public class MyClass implements SQLData
  {
    // Implement the attributes and operations for this type.
    private String col1Data;
  
    public String createData ()
    {
        System.out.println ("col1: " + col1Data);
        return col1Data;
    }
  
    // Implement SQLData interface.
    String sql_type;
  
    public String getSQLTypeName() throws SQLException
    {
      return sql_type;
    }
  
    public void readSQL(SQLInput stream, String typeName) throws SQLException
    {
      sql_type = typeName;
      col1Data = stream.readString();
    }
  
    public void writeSQL(SQLOutput stream) throws SQLException
    {
      stream.writeString(col1Data);
    }
  }
  /
  

  CREATE OR REPLACE TYPE MyObject AS OBJECT
  (
    col1Data  VARCHAR2(10),
    MEMBER FUNCTION createData
            RETURN VARCHAR2 AS LANGUAGE JAVA
      NAME 'MyClass.createData() return java.lang.String'
  );
  /
  

  Test:

  SQL> exec dbms_java.set_output(1000)
  
  PL/SQL procedure successfully completed.
  
  SQL> set serverout on
  SQL>
  SQL> select MyObject('ABC').createData() from dual;
  
  MYOBJECT('ABC').CREATEDATA()
  --------------------------------------------------------------------------------
  ABC
  
  col1: ABC
  

• By the way Self as a parameter or by passing an object Variable to a member function, both in the approach IN OUT NOCOPY Mode which is better?

  Hi all
  Asking for help which approach is better of the two in terms of performance and why (if there is no difference) or are they an and they same and only different in terms of syntax only.

  (A) to call a function with itself in passing as IN OUT nocopy
  (B) passing the calling object, same as IN OUT NOCOPY.

  @
  (In my approach, I need to pass an object with almost 30 attributes and I must assign values to few attributes of the object in a few member functions that will impact object)

  I have an object created in the
  CREATE or REPLACE TYPE my_obj AS OBJECT
  (
  NAME VARCHAR2 (100),
  FUNCTION CONSTRUCTOR My_obj RETURNS SELF AS RESULTS,
  FUNCTION MEMBER put_name (SELF IN OUT NOCOPY my_obj) RETURN PLS_INTEGER,
  RETURN of the MEMBER FUNCTION insert_name (v_my_obj IN OUT NOCOPY my_obj)
  PLS_INTEGER,
  MEMBER get_name PROCEDURE
  );
  /
  CREATE OR REPLACE TYPE BODY MY_OBJ

  FUNCTION CONSTRUCTOR RETURN self AS RESULT My_obj IS
  BEGIN
  NULL;
  RETURN;
  END;

  FUNCTION MEMBER (SELF IN OUT NOCOPY my_obj) put_name IS BACK PLS_INTEGER
  BEGIN
  Self.Name: = "my_name_in_self";
  RETURN 1;
  END put_name;

  MEMBER FUNCTION insert_name (v_my_obj IN OUT NOCOPY my_obj)
  IS BACK PLS_INTEGER
  BEGIN
  v_my_obj. Name: = "my_name_in_Alias";
  RETURN 1;
  END insert_name;

  MEMBER get_name PROCEDURE IS
  BEGIN
  dbms_output.put_line (self. (Name)
  END;
  END;
  /

  (a) put_name heel 1 call:

  declare
  v my_obj: = my_obj();
  number of ret_val;
  Start
  ret_val: = v.put_name;
  v.get_Name;
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  o/p: my_name_in_self

  (a) insert_name citing heel 2:

  declare
  v my_obj: = my_obj();
  number of ret_val;
  Start
  ret_val: = v.insert_name (v);
  v.get_Name;
  end;

  o/p: my_name_in_Alias

  What is better to use the put_name or use the function insert_name.
  I manipulate the object when it is passed to a function.

  Thanks in advance,
  Kind regards
  Gaurav R

  As Billy said above, each member method has implicitly (which can be made explicit, as with "put_name", when required, for example, to specify the "nocopy" option) parameter named 'home '. For member functions, the passage of default mode is "inside". For the procedures of members, the passage of default mode is "outside". Therefore, the actual signature of the function of your 'insert_name":

  ...
  member function insert_name(self in my_obj, v_my_obj in out nocopy my_obj) return pls_integer
  ...
  

  Since you don't self directly access this function, it is logically equivalent to a static type function (which has no implicit setting of "self"):

  ...
  static function insert_name(v_my_obj in out nocopy my_obj) return pls_integer
  ...
  

  which is basically no different than using a non-object function that takes a parameter of type of object:

  create function insert_name(v_my_obj in out nocopy my_obj) return pls_integer
  

  Gerard

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  I think that the small example can better explain what I need.
  

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  The line commented out in A1 and A2 are because I don't want to duplicate a same code
  
  Thanks a lot for any suggestion,.
  
  Carlo
  
  Published by: 918374 on 14-giu-2012 8.47

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