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Showing content from https://mariadb.com/docs/server/reference/sql-statements/data-definition/create/create-package-body below:

CREATE PACKAGE BODY | MariaDB Documentation

1. Reference
2. SQL Statements
3. Data Definition (DDL)
4. CREATE

The CREATE PACKAGE BODY statement can be used in any mode.

In Oracle mode, the PL/SQL dialect is used, while in non-Oracle mode, SQL/PSM is used.

CREATE [ OR REPLACE ]
    [DEFINER = { user | CURRENT_USER | role | CURRENT_ROLE }]
    PACKAGE BODY
    [ IF NOT EXISTS ]
    [ db_name . ] package_name
    [ package_characteristic... ]
{ AS | IS }
    package_implementation_declare_section
    package_implementation_executable_section
END [ package_name]


package_implementation_declare_section:
    package_implementation_item_declaration
      [ package_implementation_item_declaration... ]
      [ package_implementation_routine_definition... ]
  | package_implementation_routine_definition
      [ package_implementation_routine_definition...]

package_implementation_item_declaration:
    variable_declaration ;

variable_declaration:
    variable_name[,...] type [:= expr ]

package_implementation_routine_definition:
    FUNCTION package_specification_function
       [ package_implementation_function_body ] ;
  | PROCEDURE package_specification_procedure
       [ package_implementation_procedure_body ] ;


package_implementation_function_body:
    { AS | IS } package_routine_body [func_name]

package_implementation_procedure_body:
    { AS | IS } package_routine_body [proc_name]

package_routine_body:
    [ package_routine_declarations ]
    BEGIN
      statements [ EXCEPTION exception_handlers ]
    END


package_routine_declarations:
    package_routine_declaration ';' [package_routine_declaration ';']...


package_routine_declaration:
          variable_declaration
        | condition_name CONDITION FOR condition_value
        | user_exception_name EXCEPTION
        | CURSOR_SYM cursor_name
          [ ( cursor_formal_parameters ) ]
          IS select_statement
        ;


package_implementation_executable_section:
          END
        | BEGIN
            statement ; [statement ; ]...
          [EXCEPTION exception_handlers]
          END

exception_handlers:
           exception_handler [exception_handler...]

exception_handler:
          WHEN_SYM condition_value [, condition_value]...
            THEN_SYM statement ; [statement ;]...

condition_value:
          condition_name
        | user_exception_name
        | SQLWARNING
        | SQLEXCEPTION
        | NOT FOUND
        | OTHERS_SYM
        | SQLSTATE [VALUE] sqlstate_value
        | mariadb_error_code

The CREATE PACKAGE BODY statement creates the package body for a stored package. The package specification must be previously created using the CREATE PACKAGE statement.

A package body provides implementations of the package public routines and can optionally have:

• package-wide private variables

• forward declarations for private routines

• an executable initialization section

SET sql_mode=ORACLE; # unnecessary from MariaDB 11.4
DELIMITER $$
CREATE OR REPLACE PACKAGE employee_tools AS
  FUNCTION getSalary(eid INT) RETURN DECIMAL(10,2);
  PROCEDURE raiseSalary(eid INT, amount DECIMAL(10,2));
  PROCEDURE raiseSalaryStd(eid INT);
  PROCEDURE hire(ename TEXT, esalary DECIMAL(10,2));
END;
$$
CREATE PACKAGE BODY employee_tools AS
  -- package body variables
  stdRaiseAmount DECIMAL(10,2):=500;

  -- private routines
  PROCEDURE log (eid INT, ecmnt TEXT) AS
  BEGIN
    INSERT INTO employee_log (id, cmnt) VALUES (eid, ecmnt);
  END;

  -- public routines
  PROCEDURE hire(ename TEXT, esalary DECIMAL(10,2)) AS
    eid INT;
  BEGIN
    INSERT INTO employee (name, salary) VALUES (ename, esalary);
    eid:= last_insert_id();
    log(eid, 'hire ' || ename);
  END;

  FUNCTION getSalary(eid INT) RETURN DECIMAL(10,2) AS
    nSalary DECIMAL(10,2);
  BEGIN
    SELECT salary INTO nSalary FROM employee WHERE id=eid;
    log(eid, 'getSalary id=' || eid || ' salary=' || nSalary);
    RETURN nSalary;
  END;

  PROCEDURE raiseSalary(eid INT, amount DECIMAL(10,2)) AS
  BEGIN
    UPDATE employee SET salary=salary+amount WHERE id=eid;
    log(eid, 'raiseSalary id=' || eid || ' amount=' || amount);
  END;

  PROCEDURE raiseSalaryStd(eid INT) AS
  BEGIN
    raiseSalary(eid, stdRaiseAmount);
    log(eid, 'raiseSalaryStd id=' || eid);
  END;

BEGIN
  -- This code is executed when the current session
  -- accesses any of the package routines for the first time
  log(0, 'Session ' || connection_id() || ' ' || current_user || ' started');
END;
$$

DELIMITER ;

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