php 操作 oracle lob 数据2

CREATE SEQUENCE mylobs_id_seq
    NOMINVALUE
    NOMAXVALUE
    NOCYCLE
    CACHE 20
    NOORDER
INCREMENT BY 1;

CREATE TABLE mylobs (
    id NUMBER PRIMARY KEY,
    mylob CLOB
)

插入

<?php header("content-type:text/html;charset=utf-8"); error_reporting(E_ALL); set_time_limit(0); echo "<pre>"; $conn=oci_connect('demo','demo','localhost/xe','utf8'); $sql = "INSERT INTO         mylobs           (             id,             mylob           )        VALUES           (             mylobs_id_seq.NEXTVAL,             EMPTY_CLOB()           )        RETURNING           mylob INTO :mylob_loc"; $stmt = oci_parse($conn, $sql); $myLOB = oci_new_descriptor($conn, OCI_D_LOB); oci_bind_by_name($stmt, ":mylob_loc", $myLOB, -1, OCI_B_CLOB); oci_execute($stmt, OCI_DEFAULT) or die ("Unable to execute query\n"); $content=str_repeat('你',80000); if ( !$myLOB->save($content) ) {     oci_rollback($conn); } else {     oci_commit($conn); } oci_free_statement($stmt); $myLOB->free(); oci_close($conn);

查询

<?php header("content-type:text/html;charset=utf-8"); error_reporting(E_ALL); set_time_limit(0); echo "<pre>"; $conn=oci_connect('demo','demo','localhost/xe','utf8'); $sql = "SELECT * FROM mylobs ORDER BY id"; $stmt = oci_parse($conn, $sql); oci_execute($stmt) or die ("Unable to execute query\n"); while ( $row = oci_fetch_assoc($stmt) ) {     echo "ID: {$row['ID']}, ";     echo $row['MYLOB']->load()."\n"; } oci_free_statement($stmt); oci_close($conn);

修改

<?php
header("content-type:text/html;charset=utf-8");
error_reporting(E_ALL);
set_time_limit(0);

echo "<pre>";

$conn=oci_connect('demo','demo','localhost/xe','utf8');

$sql = "SELECT mylob FROM mylobs WHERE id = 1 FOR UPDATE";

$stmt = oci_parse($conn, $sql);

oci_execute($stmt, OCI_DEFAULT) or die ("Unable to execute query\n");

if ( FALSE === ($row = oci_fetch_assoc($stmt) ) ) {
    oci_rollback($conn);
    die ("Unable to fetch row\n");
}

if ( !$row['MYLOB']->truncate() ) {
    oci_rollback($conn);
    die ("Failed to truncate LOB\n");
}

if ( !$row['MYLOB']->save('UPDATE: '.date('H:i:s',time()) ) ) {
    oci_rollback($conn);
} else {
    oci_commit($conn);
}

oci_free_statement($stmt);
$row['MYLOB']->free();

oci_close($conn);