Php/docs/mysqli-result.data-seek
mysqli_result::data_seek
mysqli_data_seek
(PHP 5, PHP 7)
mysqli_result::data_seek -- mysqli_data_seek — Adjusts the result pointer to an arbitrary row in the result
说明
面向对象风格
public mysqli_result::data_seek
( int $offset
) : bool
过程化风格
mysqli_data_seek
( mysqli_result $result
, int $offset
) : bool
The mysqli_data_seek() function seeks to an arbitrary
result pointer specified by the offset in the
result set.
参数
result- 仅以过程化样式：由 mysqli_query()，mysqli_store_result() 或 mysqli_use_result()返回的结果集标识。
offset- The field offset. Must be between zero and the total number of rows minus one (0..mysqli_num_rows() - 1).
返回值
成功时返回 true， 或者在失败时返回 false。
注释
Note:
This function can only be used with buffered results attained from the use of the mysqli_store_result() or mysqli_query() functions.
范例
Example #1 面向对象风格
<?php/* Open a connection */$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit();}$query = "SELECT Name, CountryCode FROM City ORDER BY Name";if ($result = $mysqli->query($query)) { /* seek to row no. 400 */ $result->data_seek(399); /* fetch row */ $row = $result->fetch_row(); printf ("City: %s Countrycode: %s\n", $row[0], $row[1]); /* free result set*/ $result->close();}/* close connection */$mysqli->close();?>
Example #2 过程化风格
<?php/* Open a connection */$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* check connection */if (!$link) { printf("Connect failed: %s\n", mysqli_connect_error()); exit();}$query = "SELECT Name, CountryCode FROM City ORDER BY Name";if ($result = mysqli_query($link, $query)) { /* seek to row no. 400 */ mysqli_data_seek($result, 399); /* fetch row */ $row = mysqli_fetch_row($result); printf ("City: %s Countrycode: %s\n", $row[0], $row[1]); /* free result set*/ mysqli_free_result($result);}/* close connection */mysqli_close($link);?>
以上例程会输出：
City: Benin City Countrycode: NGA
参见
- mysqli_store_result() - 转移上一次查询返回的结果集
- mysqli_fetch_row() - Get a result row as an enumerated array
- mysqli_fetch_array() - Fetch a result row as an associative, a numeric array, or both
- mysqli_fetch_assoc() - Fetch a result row as an associative array
- mysqli_fetch_object() - Returns the current row of a result set as an object
- mysqli_query() - 对数据库执行一次查询
- mysqli_num_rows() - Gets the number of rows in a result
