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The procedure raise_salary raises the salary of an employee by a given percentage by performing a simple update: 24 25 26 27 28 29 30 31 32 procedure raise_salary( p_empno in number, p_salary_hike_pcnt in number ) is begin update emp set salary = salary * (p_salary_hike_pcnt/100.00) where empno = p_empno; end raise_salary; Finally, the fire_emp procedure deletes a given employee s record from the emp table: 33 34 procedure fire_emp( 35 p_empno in number ) 36 is 37 begin 38 delete emp 39 where empno = p_empno; 40 end fire_emp; 41 end manager_pkg; 42 / Package body created. Our second (and final) package, clerk_pkg, simply lists the employee and department details with two functions, list_dept_details and list_emp_details, each of which returns a ref cursor containing relevant details: db_data_access_layer@ORA10G> -- create package that reports schema data db_data_access_layer@ORA10G> create or replace package clerk_pkg 2 as 3 function list_dept_details( p_dept_no in number ) 4 return sys_refcursor; 5 function list_emp_details( p_empno in number ) 6 return sys_refcursor; 7 end clerk_pkg; 8 / Package created. db_data_access_layer@ORA10G> create or replace package body clerk_pkg 2 as 3 function list_dept_details( p_dept_no in number ) 4 return sys_refcursor 5 is 6 l_dept_details sys_refcursor; 7 begin 8 open l_dept_details for
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9 select dept_no, dept_name 10 from dept 11 where dept_no = p_dept_no; 12 return l_dept_details; 13 end list_dept_details; 14 15 function list_emp_details( p_empno in number ) 16 return sys_refcursor 17 is 18 l_emp_details sys_refcursor; 19 begin 20 open l_emp_details for 21 select empno, ename, dept_no, salary, job 22 from emp 23 where empno = p_empno; 24 return l_emp_details; 25 end list_emp_details; 26 end clerk_pkg; 27 / Package body created. We next create public synonyms for these packages so that we can refer to them without having to use the db_data_access_layer schema name: db_data_access_layer@ORA10G> create public synonym manager_pkg for manager_pkg; Synonym created. db_data_access_layer@ORA10G> create public synonym clerk_pkg for clerk_pkg; Synonym created.
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Creating Database Roles and Schema for End Users
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In our sample application, the end users fall into two categories based on their roles. The managers use the package manager_pkg to manipulate information stored in the emp and dept tables. The clerks use the package clerk_pkg to query information stored in the emp and dept tables. We will create two database roles, manager_role and clerk_role, which correspond to the two preceding user categories, respectively. A database role is a set of privileges that provides a DBA with an alternative to assigning privileges directly to the user. You combine privileges into roles and assign the roles to users. Thus, if you want to add or remove a privilege from a group of users, you can simply grant or revoke it from the corresponding role instead of doing the same for each individual user account. See the section titled Introduction to Roles in 5 of Oracle Database Security Guide (10g Release 1) for more details on roles.
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First, we create manager_role and grant it privileges to execute both the manager_pkg and clerk_pkg packages after connecting as admin. db_data_access_layer@ORA10G> connect admin/admin Connected. admin@ORA10G> -- create manager_role admin@ORA10G> create role manager_role; Role created. admin@ORA10G> grant execute on manager_pkg to manager_role; Grant succeeded. admin@ORA10G> grant execute on clerk_pkg to manager_role; Grant succeeded. Next, we create clerk_role with the privilege of executing only the package clerk_pkg: admin@ORA10G> create role clerk_role; Role created. admin@ORA10G> grant execute on clerk_pkg to clerk_role; Grant succeeded. Finally, it is time to create the database users that correspond to end users of the application in our database. We will create two representative end users. The end user manager1 maps to the database schema db_manager1, which has the roles manager_role and clerk_role. The end user clerk1 maps to the database schema db_clerk1, which is granted only the role clerk_role. Each of these two database users also gets the create session privilege required to log into the database. In a real-life application, we would, of course, have many end users getting mapped to various database roles based on the business functions they perform. admin@ORA10G> create user db_manager1 identified by db_manager1; User created. admin@ORA10G> grant create session to db_manager1; Grant succeeded. admin@ORA10G> grant manager_role, clerk_role to db_manager1; Grant succeeded. admin@ORA10G> create user db_clerk1 identified by db_clerk1; User created. admin@ORA10G> grant create session to db_clerk1; Grant succeeded. admin@ORA10G> grant clerk_role to db_clerk1; Grant succeeded. Now, for example, if we try to access the package manager_pkg while connected as db_clerk1, we will get an error because the corresponding access does not exist: db_clerk1@ORA10G> desc manager_pkg ERROR: ORA-04043: object "DB_DATA_ACCESS_LAYER"."MANAGER_PKG" does not exist
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