oci_new_descriptor()

(PHP 5, PHP 7, PECL OCI8 >= 1.1.0)

初始化一个新的空 LOB 或 FILE 描述符

说明

oci_new_descriptor(resource $connection[,int $type]): OCI-Lob

oci_new_descriptor()分配资源以保存描述符或 LOB 定位器。有效的$type值是：OCI_D_FILE，OCI_D_LOB以及OCI_D_ROWID。

Example #1 oci_new_descriptor()例子

<?php
    /* This script is designed to be called from a HTML form.
     * It expects $user, $password, $table, $where, and $commitsize
     * to be passed in from the form.  The script then deletes
     * the selected rows using the ROWID and commits after each
     * set of $commitsize rows. (Use with care, there is no rollback)
     */
    $conn = oci_connect($user, $password);
    $stmt = oci_parse($conn, "select rowid from $table $where");
    $rowid = oci_new_descriptor($conn, OCI_D_ROWID);
    oci_define_by_name($stmt, "ROWID", $rowid);
    oci_execute($stmt);
    while (oci_fetch($stmt)) {
       $nrows = oci_num_rows($stmt);
       $delete = oci_parse($conn, "delete from $table where ROWID = :rid");
       oci_bind_by_name($delete, ":rid", $rowid, -1, OCI_B_ROWID);
       oci_execute($delete);
       echo "$nrows\n";
       if (($nrows % $commitsize) == 0) {
           oci_commit($conn);
       }
    }
    $nrows = oci_num_rows($stmt);
    echo "$nrows deleted...\n";
    oci_free_statement($stmt);
    oci_close($conn);
?>

<?php
    /* This script demonstrates file upload to LOB columns
     * The formfield used for this example looks like this
     * <form action="upload.php" method="post" enctype="multipart/form-data">
     * <input type="file" name="lob_upload" />
     * ...
     */
  if (!isset($lob_upload) || $lob_upload == 'none'){
?>
<form action="upload.php" method="post" enctype="multipart/form-data">
Upload file: <input type="file" name="lob_upload" /><br />
<input type="submit" value="Upload" /> - <input type="reset" value="Reset" />
</form>
<?php
  } else {
     // $lob_upload contains the temporary filename of the uploaded file
     // see also the features section on file upload,
     // if you would like to use secure uploads
     $conn = oci_connect($user, $password);
     $lob = oci_new_descriptor($conn, OCI_D_LOB);
     $stmt = oci_parse($conn, "insert into $table (id, the_blob)
               values(my_seq.NEXTVAL, EMPTY_BLOB()) returning the_blob into :the_blob");
     oci_bind_by_name($stmt, ':the_blob', $lob, -1, OCI_B_BLOB);
     oci_execute($stmt, OCI_DEFAULT);
     if ($lob->savefile($lob_upload)){
        oci_commit($conn);
        echo "Blob successfully uploaded\n";
     }else{
        echo "Couldn't upload Blob\n";
     }
     oci_free_descriptor($lob);
     oci_free_statement($stmt);
     oci_close($conn);
  }
?>

Example #2 oci_new_descriptor()例子

<?php
    /* Calling PL/SQL stored procedures which contain clobs as input
     * parameters (PHP 4 >= 4.0.6).
     * Example PL/SQL stored procedure signature is:
     *
     * PROCEDURE save_data
     *   Argument Name                  Type                    In/Out Default?
     *   ------------------------------ ----------------------- ------ --------
     *   KEY                            NUMBER(38)              IN
     *   DATA                           CLOB                    IN
     *
     */
    $conn = oci_connect($user, $password);
    $stmt = oci_parse($conn, "begin save_data(:key, :data); end;");
    $clob = oci_new_descriptor($conn, OCI_D_LOB);
    oci_bind_by_name($stmt, ':key', $key);
    oci_bind_by_name($stmt, ':data', $clob, -1, OCI_B_CLOB);
    $clob->write($data);
    oci_execute($stmt, OCI_DEFAULT);
    oci_commit($conn);
    $clob->free();
    oci_free_statement($stmt);
?>

oci_new_descriptor()如果出错返回FALSE。

Note:

在 PHP 5.0.0 之前的版本必须使用ocinewdescriptor()替代本函数。该函数名仍然可用，为向下兼容作为oci_new_descriptor()的别名。不过其已被废弃，不推荐使用。

Here is an example of retrieving a CLOB as an output parameter from a stored procedure. This is a bit hack-y and maybe there's a cleaner way to do this, but I couldn't find one. The following definitely works with Oracle 9:
// the query to call the procedure, which includes declaring the
// output parameter and assigning the result to a variable to be bound.
$qry = '
declare clob_out clob;
begin
 myprocedure(someparam_in, clob_out); 
 :myclob := clob_out;
end;
';
// parse the query and bind the 'myclob' variable
$sth = OCIParse($conn,$qry);
$myclob = OCINewDescriptor($conn,OCI_D_LOB);
OCIBindByName($sth,":myclob",$myclob,-1,OCI_B_CLOB);
OCIExecute($sth);
// display the results
echo $myclob->load();

Just a note. When INSERTing a CLOB, if a VALUES clause is used, Oracle notes: You cannot initialize an internal LOB attribute in an object with a value other than empty or null. That is, you cannot use a literal.
That's why all the examples here INSERT an EMPTY_CLOB(), and use RETURNING to grab the pointer.
However, a CLOB can also be INSERTed via a SELECT statement, and that won't require any descriptors.
Example:
$Clob = Str_Replace("'", "''", $Clob);
OCIParse($DB, "INSERT INTO My_Table (My_Clob) SELECT '$Clob' FROM Dual");
This, of course, allows the use of a WHERE clause as well.

another way to display your clob details !
  $query = "select * from Your_clob_table";
  $stmt = OCIParse($conn, $query);
  ociexecute($stmt); 
    
    while ( OCIFetch($stmt)) 
    { 
     $lob = OCIResult($stmt,"CLOB_MESSAGE");
     $CLOB_MESSAGE = $lob->load();
     echo $CLOB_MESSAGE;
    }
this works,

How to insert big XML data as CLOB into table with XMLType field.
<?php
//CREATE TABLE sometable(
//id number(8) not null,
//record XMLType
//) XMLTYPE COLUMN record STORE AS OBJECT RELATIONAL
//XMLSCHEMA "someschema" ELEMENT "some_element";
//
$sql = "INSERT INTO sometable(id, record) VALUES(some_sequqnce.nextval, sys.xmltype.createxml(:rec)) RETURNING ID INTO :rid";
$stmt = OCIParse($ora_conn,$sql);
$clob = OCINewDescriptor($ora_conn, OCI_D_LOB);
$rowid = OCINewDescriptor($ora_conn,OCI_D_ROWID);
OCIBindByName($stmt, ':rec', &$clob, -1,OCI_B_CLOB);
OCIBindByName($stmt, ':rid', $rowid, -1);
$clob->WriteTemporary($xml,OCI_TEMP_CLOB);
$success = OCIExecute($stmt,OCI_DEFAULT);
if(!$success) {
OCICommit($ora_conn);
}
OCIFreeStatement($stmt);
OCIFreeDesc($lob);
?>
I hope it will help :)

I found another method of inserting/updating lob data. It works the same was as passing lob parameters to a stored procedure and avoids the need for a RETURNING clause.
  $lob = OCINewDescriptor($conn, OCI_D_LOB);
  $stmt = OCIParse($conn,"insert into $table (id, the_blob) 
        values(my_seq.NEXTVAL, :the_blob)");
  OCIBindByName($stmt, ':the_blob', &$lob, -1, OCI_B_BLOB);
  $lob->WriteTemporary($data);
  OCIExecute($stmt, OCI_DEFAULT);
  $lob->close();
  $lob->free();
  OCICommit($conn);
There are some cases involving triggers where you can't use a RETURNING clause, so this method can come in handy. The case where I needed it was updating a view that had an instead-of update trigger.

[Editor's note: don't use '&' for parameters in bind calls in PHP 5]
The code up above is somewhat correct... here's an example of how I got a CLOB to work
<?php
function insert_adinfo($AdInfoID, $MagazineType, $Publish, $DatePost, $BodyText) 
{
  global $db;
  // Insert record into database
  $clob = OCINewDescriptor($db, OCI_D_LOB);
  $stmt = OCIParse($db,"insert into tblAdInfo values ($AdInfoID,         $MagazineType, '$Publish', to_date('$DatePost', 'YYYY-MM-DD'),         EMPTY_CLOB()) returning BodyText into :the_blob");
  OCIBindByName($stmt, ':the_blob', &$clob, -1, OCI_B_CLOB);
  OCIExecute($stmt, OCI_DEFAULT);
  if($clob->save($BodyText)){
    OCICommit($db);
  }else{
    echo "Problems: Couldn't upload Clob\n";
  }
  
  OCIFreeDescriptor($clob);
  OCIFreeStatement($stmt);
}
?>

Passing CLOB to stored procedure and retrieve CLOB too (function lobinout(a in clob) return clob)
<?
  error_reporting(1+2+4+8);
  $conn = OCILogon('batdtd', 'batdtd', 'batxml');
  
  $lobin = OCINewDescriptor($conn, OCI_D_LOB);
  $lobout = OCINewDescriptor($conn, OCI_D_LOB);
  
  $stmt = OCIParse($conn, "declare rs clob; begin :rs := lobinout(:par); end;");
  $lob_data = 'abcdefgh';
  
  echo "binding lobin...";
  OCIBindByName($stmt, ':par', $lobin, -1, OCI_B_CLOB);
  
  echo "done<br>binding rs...";
  
  OCIBindByName($stmt, ':rs', $lobout, -1, OCI_B_CLOB);
  
  echo "done<br>writing temp lob...";
       // here we pass data to func
  $lobin -> WriteTemporary($lob_data);
  echo "done<br>executing...";
  
  OCIExecute($stmt, OCI_DEFAULT);
       // here we load data returned from func
  echo "done<br>rs = ".$lobout->load();
  OCICommit($conn);
  $lobin -> free();
  $lobout -> free();
  OCIFreeStatement($stmt);
  OCILogoff($conn);
?>

In PHP5 the way Example 2 passes a CLOB bind variable as an input
parameter to a PL/SQL procedure can be extended to BLOBs.
The critical change is:
  OCIBindByName($stmt, ':data', $blob, -1, OCI_B_BLOB);
  $blob->WriteTemporary($data, OCI_B_BLOB);
This doesn't work for me in PHP4. I believe it is because the
implementation of OCIWriteTemporaryLob() always binds as a CLOB.
(This is true as of php4-STABLE-200403170230). In PHP5 the interface
has changed and a type parameter is permitted.

Two examples of retrieving CLOBs from the database. They are almost identical. The first is using a package(and cursor) which is how I interface to Oracle at work, and the second is using straight SQL, which most people post examples in.
I also convert the case from upper to lower, since that is how I prefer to work with assoc arrays...
Instead of using the get_class() function you could use the OCIColumnType() function which (in this case) would return 'CLOB' as a result...
/**
* Example 1
*
* Using a PL/SQL package and cursor
*
*/
$cursor=':p_cur';
$sql2="begin clobPackage.getClob($cursor); end;";
$curs=OCINewCursor($conn);
$stmt=OCIParse($conn,$sql2);
OCIBindByName($stmt,$cursor,&$curs,-1,OCI_B_CURSOR);
OCIExecute($stmt,OCI_DEFAULT);
OCIExecute($curs,OCI_DEFAULT);
$x=0;
while(OCIFetch($curs)){ 
 $cols=OCINumCols($curs);
 for($i=1;$i<=$cols;$i++){
  $column_name=OCIColumnName($curs,$i);
  if(is_object($tmp=OCIResult($curs,$i))&&get_class($tmp)=='OCI-Lob'){
   $column_value=$tmp->load();
  }else{
   $column_value=$tmp;
  }
  $result[$x][strtolower($column_name)]=trim($column_value);
 }
 $x++;
}
OCICommit($conn);
/**
* Example 2
*
* Using a SELECT
*
*/
$query="SELECT a_num, a_clob FROM clob_test";
$stmt=OCIParse($conn,$query);
OCIExecute($stmt,OCI_DEFAULT); 
$x=0;
while(OCIFetch($stmt)){ 
 $ncols=OCINumCols($stmt);
 for($i=1;$i<=$ncols;$i++){
  $column_name=OCIColumnName($stmt,$i);
  if(is_object($tmp=OCIResult($curs,$i))&&get_class($tmp)=='OCI-Lob'){
   $column_value=$tmp->load();
  }else{
   $column_value=$tmp;
  }
  $result[$x][strtolower($column_name)]=trim($column_value);
 }
 $x++;
}
OCICommit($conn);
I hope someone finds this useful.
Cheers,
Keith.

If you're passing a clob variable to oracle stored procedure, you could:
<?php
$qry = 'begin my_sp(:largetext); end;';
$stmt = oci_parse($conn, $qry); //definition of $conn is not included here
$clob = oci_new_descriptor($conn, OCI_D_LOB);
oci_bind_by_name($stmt, ":largetext", $clob, -1, OCI_B_CLOB);
$clob->writetemporary($mylargedata);
oci_execute($stmt);
$clob->free();
oci_free_statement($stmt);
?>
Hopefully this will help!

<?php
// calling stored procedure to get clob data type (we use to get xml from oracle)
error_reporting(E_ALL ^ E_NOTICE);
$conn = oci_connect($user, $password);
    
$sql = "BEGIN sp_employee_xml_data_select(:result); END;";
$stmt = oci_parse($conn , $sql);
$objClob = oci_new_descriptor($conn, OCI_D_LOB);
oci_bind_by_name($stmt, ':result', $objClob, -1, OCI_B_CLOB);
oci_execute($stmt, OCI_DEFAULT);
$xmlData = $objClob->load($result);
$objClob->free();
oci_free_statement($stmt);
echo $xmlData;
?>

I had the same problem with updating the lobs with shorter content as in one of the notes above. The addition of "\0" at the end of the replacement text didn't help either. But the following worked perfectly:
$sql = "UPDATE sometable SET lob_col = EMPTY_LOB() WHERE key_col = $key RETURNING lob_col INTO :lob";
$stmt = OCIParse($conn,$sql);
$lob = OCINewDescriptor($conn,OCI_D_LOB);
OCIBindByName($stmt,':lob',&$lob,-1,OCI_B_BLOB);
OCIExecute($stmt,OCI_DEFAULT);
$lob->save($sometext);
$lob->free();

To read a lob, other way: 
$sql = OCIParse("select * from table_with_lob_field"); 
OCIExecute($sql, OCI_DEFAULT); 
while ( OCIFetch($sql)) { 
 $o = ociresult($sql,"loc_field_name");
 $loc_field_name = $o->load();
 print $loc_field_name;
};

Here is another example of how to insert a BLOB into table using a PL/SQL function.
Oracle Database Code:
create table blob_table ( the_blob blob);
create or replace function insert_blob(out_blob out blob) 
  return integer is
  begin
    insert into blob_table values (EMPTY_BLOB()) 
     return the_blob into out_blob;
    return 0; /* Success */
  end insert_blob;
PHP Code:
<?php
 $iResult = -1;
 $strTestData = 'Testing 123';
 $conn = oci_connect($user, $password);
 $stmt = oci_parse($conn, "begin :RES := insert_blob(:OUT_BLOB); end;");
 
 $objBlob = oci_new_descriptor($conn, OCI_D_LOB);
 oci_bind_by_name($stmt, ":RES", $iResult);
 oci_bind_by_name($stmt, ":OUT_BLOB", $objBlob, -1, OCI_B_BLOB);
 oci_execute($stmt, OCI_DEFAULT);
 $objBlob->write($strTestData);
 oci_commit($conn);
 $objBlob->free();
 oci_free_statement($stmt);
?>