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Using Host Credentials in Linux to execute SQL in PL/SQL

Oracle Error Tips by Donald Burleson

 

Also see host_credentials_in_linux. and execute_immediate.

 

By Laurent Schneider:

When you want to run a SQL script, you rather use sqlplus. If you want to run it within a PL/SQL stored procedure, you are screwed. You could redo the logic of sqlplus, this is what any decent IDE and code runnner does, and it's a pile of work and you will get lot's of bugs…

Another approach is to use sqlplus.

Wait! calling sqlplus from pl/sql? Well… why not. For instance via external job

  1. create a table with sql scripts
    create table t(id number primary key, text clob);
    insert into t(id, text) values (
      42, 'update emp set sal=sal*2 /* XMas gift */;'
    );
    
  2. create a shell script, /tmp/ddl, that spool and executes T.text content
    #!/bin/ksh
    ORACLE_HOME=/u01/app/oracle/product/12.1.0/db_1
    export ORACLE_HOME
    $ORACLE_HOME/bin/sqlplus -s -L scott/tiger <<EOF
      set hea off lin 2000 pages 0 trims on
      spo /tmp/$1.sql
      select text from t where id=$1;
      spo off
      @/tmp/$1
    EOF
    
  3. create a UNIX credential
    begin 
      dbms_scheduler.create_credential(
        'C','USER01','PW');
    end;
    /
    
  4. create and run an external job
    begin
      DBMS_SCHEDULER.CREATE_JOB(
        job_name             => 'J',
        job_type             => 'EXECUTABLE',
        number_of_arguments  => 1,
        job_action           => '/tmp/ddl',
        credential_name      => 'C');
      DBMS_SCHEDULER.SET_JOB_ARGUMENT_VALUE(
        'J', 1, '42');
      DBMS_SCHEDULER.run_job('J');
    end;
    /
    

Note that the CREATE EXTERNAL JOB privilege is powerful and your DBA won’t like developers using it.

 

 


 

 

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