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DatabaseCore : add the function lo_write , lo_replace and lo_read to create large

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objects from string
This commit is contained in:
sparkyx 2025-09-08 17:19:09 +02:00
parent 01a968e4fc
commit 40839add43
2 changed files with 164 additions and 2 deletions
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76
include/lib/database_core.class.php
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@ -759,6 +759,80 @@ class DatabaseCore
}
return false;
}
/**
* @brief large_object writee: create a Large object if oid is not given
* with data content in a binaray
* @param $binary_data (raw data) binary
* @returns $oid of the LO, false if it fails
*/
function lo_write($binary_data)
{
//var $a : 0 where in a transaction, 1 we are not in a transaction
$a=0;
if ( $this->status() !== PGSQL_TRANSACTION_INTRANS ) {
$a=1;
$this->start();
}
$oid= pg_lo_create($this->db);
if ( ($handle=pg_lo_open($this->db,$oid,"w")) == false ) { return false ;}
pg_lo_write($handle, $binary_data);
pg_lo_close($handle);
if ( $a==1) { $this->commit(); }
return $oid;
}
/**
* @brief read a Large object with data content in a binary
* @param $oid (int8) oid of the large object
* @returns $binary_data (raw data) binary
*/
function lo_read($oid)
{
//var $a : 0 where in a transaction, 1 we are not in a transaction
$a=0;
if ( $this->status() !== PGSQL_TRANSACTION_INTRANS ) {
$a=1;
$this->start();
}
$handle=pg_lo_open($this->db,$oid,"r");
if ( $handle == false ) { return false ;}
// set position end of the LO
pg_lo_seek($handle, 0, PGSQL_SEEK_END);
// get the size
$size= pg_lo_tell($handle);
// set position to start
pg_lo_seek($handle, 0, PGSQL_SEEK_SET);
// read the comùplete LOB
$binary_data = pg_lo_read($handle,$size );
pg_lo_close($handle);
if ( $a==1) { $this->commit(); }
return $binary_data;
}
/**
* @brief replace a Large object with data content in a binary
* @param $oid (int8) oid of the large object
* @param $binary_data (raw data) binary
* @returns $oid of the LO, false if it fails
*/
function lo_replace($binary_data, $oid) {
$a = 0;
if ($this->status() !== PGSQL_TRANSACTION_INTRANS) {
$a = 1;
$this->start();
}
$handle = pg_lo_open($this->db, $oid, "w");
if ( $handle == false ) { return false ;}
pg_lo_truncate($handle, 0);
pg_lo_write($handle, $binary_data);
pg_lo_close($handle);
if ($a == 1) {
$this->commit();
}
return $oid;
}
/**
* \brief wrapper for the function pg_num_rows
@ -823,7 +897,7 @@ class DatabaseCore
/**
* \brief wrapper for the function pg_lo_unlink
* \param $p_oid is the of oid
* \return return the result of the operation
* \return return the result of the operation : false == fails
*/
function lo_unlink($p_oid)