How to use an Oracle sequence from PHP ODBC function - php

Question

When trying to insert this problem generates me. Use of the undefined constant SEQUENCE_ID_PROBLEMA - assumed SECUENCIA_ID_PROBLEMA
I do not know where the problem is, please help.
My Oracle sequence:
<code>
CREATE SEQUENCE INFORMACION.SECUENCIA_ID_PROBLEMA
START WITH 0
MAXVALUE 9999999999999999999999999999
MINVALUE 0
NOCYCLE
NOCACHE
NOORDER;
</code>
My code in PHP:
<code>
$sql = "INSERT INTO $tabla (ID_PROBLEMA, HORA_INICIO, PROBLEMA, CAUSA,
SOLUCION, HORA_FIN, ID_ASIGNACION) VALUES (?, ?, ?, ?, ?, ?, ?)";
$stmt = odbc_prepare($Conex, $sql);
$success = odbc_execute($stmt,[SECUENCIA_ID_PROBLEMA.nextval,$HORA_INICIO,$PROBLEMA, $CAUSA,SOLUCION,sysdate, $ID_ASIGNACION] );
</code>

Answer 1

PHP and SQL are entirely different languages and what you're getting is a PHP warning triggered by the PHP interpreter:
define('FOO', 3.1416);
echo FOO; // 3.1416
echo BAR; // Warning: Use of undefined constant BAR - assumed 'BAR' (this will throw an Error in a future version of PHP)
Your code tries to handle the sequence name as dynamic input. You cannot use prepared statements for that because the whole purpose of prepared statements is to prevent that from happening. If you really have to, you need to generate the basic SQL skeleton with plain string functions:
$table = 'PROBLEMA';
$sequence = 'SECUENCIA_ID_PROBLEMA';
$sql = "INSERT INTO $table (ID_PROBLEMA, HORA_INICIO, PROBLEMA, CAUSA,
SOLUCION, HORA_FIN, ID_ASIGNACION) VALUES ($sequence.nextval, ?, ?, ?, ?, ?, ?)";
INSERT INTO PROBLEMA (ID_PROBLEMA, HORA_INICIO, PROBLEMA, CAUSA,
SOLUCION, HORA_FIN, ID_ASIGNACION) VALUES (SECUENCIA_ID_PROBLEMA.nextval, ?, ?, ?, ?, ?, ?)
However, your code also tries to feed the dynamic bound variable with a fixed hard-coded text. I wonder if this extra complexity is intentional and necessary. Having different tables with the same exact column names is a potential code smell :)

Answer 2

In the end you can not use the sequence from php. What I did was create a trigger in the Oracle Data Bae so that it executes the sequence when insert a new row
<code>
CREATE SEQUENCE INFORMACION.SECUENCIA_ID_PROBLEMA
START WITH 0
MAXVALUE 9999999999999999999999999999
MINVALUE 0
NOCYCLE
NOCACHE
NOORDER;
CREATE TRIGGER problema_on_insert
BEFORE INSERT ON PROBLEMA
FOR EACH ROW
BEGIN
SELECT SECUENCIA_ID_PROBLEMA.nextval
INTO :new.ID_PROBLEMA
FROM dual;
END;
</code>