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检测 statement
的当前行中的指定 column
是否为 null
。
statement
有效的 OCI 语句标识符。
column
字段索引(从 1 开始)或者名称。
示例 #1 oci_field_name() 示例
<?php
// 创建表:
// CREATE TABLE mytab (c1 NUMBER);
// INSERT INTO mytab VALUES (1);
// INSERT INTO mytab VALUES (NULL);
$conn = oci_connect("hr", "hrpwd", "localhost/XE");
if (!$conn) {
$m = oci_error();
trigger_error(htmlentities($m['message']), E_USER_ERROR);
}
$stid = oci_parse($conn, "SELECT * FROM mytab");
oci_execute($stid);
while (($row = oci_fetch_array($stid, OCI_RETURN_NULLS)) != false) {
$ncols = oci_num_fields($stid);
for ($col = 1; $col <= $ncols; $col++) {
var_dump(oci_field_is_null($stid, $col));
}
}
// 输出:
// bool(false)
// bool(true)
oci_free_statement($stid);
oci_close($conn);
?>