(PECL ibm_db2 >= 1.6.0)
db2_lob_read — 每次调用获取用户定义大小的 LOB 文件
使用 db2_lob_read() 迭代结果集中的指定列并检索用户定义大小的 LOB 数据。
stmt包含 LOB 数据的有效 stmt 资源。
colnumstmt 资源结果集中有效的列号。
length要从 stmt 资源中检索的 LOB 数据的大小。
返回用户指定的数据量。如果无法检索数据，则返回 false。
示例 #1 迭代不同类型的数据
<?php
/* 数据库连接参数 */
$db = 'SAMPLE';
$username = 'db2inst1';
$password = 'ibmdb2';
/* 获取连接资源 */
$conn = db2_connect($db,$username,$password);
if ($conn) {
$drop = 'DROP TABLE clob_stream';
$result = @db2_exec( $conn, $drop );
$create = 'CREATE TABLE clob_stream (id INTEGER, my_clob CLOB)';
$result = db2_exec( $conn, $create );
$variable = "";
$stmt = db2_prepare($conn, "INSERT INTO clob_stream (id,my_clob) VALUES (1, ?)");
$variable = "THIS IS A CLOB TEST. THIS IS A CLOB TEST.";
db2_bind_param($stmt, 1, "variable", DB2_PARAM_IN);
db2_execute($stmt);
$sql = "SELECT id,my_clob FROM clob_stream";
$result = db2_prepare($conn, $sql);
db2_execute($result);
db2_fetch_row($result);
$i = 0;
/* 读取 LOB 数据 */
while ($data = db2_lob_read($result, 2, 6)) {
echo "Loop $i: $data\n";
$i = $i + 1;
}
$drop = 'DROP TABLE blob_stream';
$result = @db2_exec( $conn, $drop );
$create = 'CREATE TABLE blob_stream (id INTEGER, my_blob CLOB)';
$result = db2_exec( $conn, $create );
$variable = "";
$stmt = db2_prepare($conn, "INSERT INTO blob_stream (id,my_blob) VALUES (1, ?)");
$variable = "THIS IS A BLOB TEST. THIS IS A BLOB TEST.";
db2_bind_param($stmt, 1, "variable", DB2_PARAM_IN);
db2_execute($stmt);
$sql = "SELECT id,my_blob FROM blob_stream";
$result = db2_prepare($conn, $sql);
db2_execute($result);
db2_fetch_row($result);
$i = 0;
/* 读取 LOB 数据 */
while ($data = db2_lob_read($result, 2, 6)) {
echo "Loop $i: $data\n";
$i = $i + 1;
}
} else {
echo '无连接: ' . db2_conn_errormsg();
}
?>上面的示例将输出
Loop 0: THIS I Loop 1: S A CL Loop 2: OB TES Loop 3: T. THI Loop 4: S IS A Loop 5: CLOB Loop 6: TEST. Loop 0: THIS I Loop 1: S A BL Loop 2: OB TES Loop 3: T. THI Loop 4: S IS A Loop 5: BLOB Loop 6: TEST.