PHP8 db2_lob_read
2024-04-07 10:23 更新
(PECL ibm_db2 >= 1.6.0)
db2_lob_read — 每次调用时获取用户定义的 LOB 文件大小
说明
db2_lob_read(resource $stmt, int $colnum, int $length): string|false
使用 db2_lob_read() 循环访问 结果集并检索用户定义的 LOB 数据大小。
参数
stmt
包含 LOB 数据的有效资源。
stmt
colnum
资源结果集中的有效列号。
stmt
length
要从资源中检索的 LOB 数据的大小。
stmt
返回值
返回用户指定的数据量。如果无法检索数据,则返回 false。
示例
示例 #1 遍历不同类型的数据
<?php
/* Database Connection Parameters */
$db = 'SAMPLE';
$username = 'db2inst1';
$password = 'ibmdb2';
/* Obtain Connection Resource */
$conn = db2_connect($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);
$i = 0;
/* Read LOB data */
while ($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);
$i = 0;
/* Read LOB data */
while ($data = db2_lob_read($result, 2, 6)) {
echo "Loop $i: $data\n";
$i = $i + 1;
}
} else {
echo 'no connection: ' . db2_conn_errormsg();
}
?>
以上示例会输出:
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.
参见
- db2_bind_param() - 将 PHP 变量绑定到 SQL 语句参数
- db2_exec() - 直接执行 SQL 语句
- db2_execute() - 执行准备好的 SQL 语句
- db2_fetch_row() - 将结果集指针设置为下一行或请求的行
- db2_prepare() - 准备要执行的 SQL 语句
- db2_result() - 从结果集中的一行返回一列
以上内容是否对您有帮助:
更多建议: