Php/docs/mysqli-result.field-seek
mysqli_result::field_seek
mysqli_field_seek
(PHP 5, PHP 7)
mysqli_result::field_seek -- mysqli_field_seek — Set result pointer to a specified field offset
说明
面向对象风格
public mysqli_result::field_seek
( int $fieldnr
) : bool
过程化风格
mysqli_field_seek
( mysqli_result $result
, int $fieldnr
) : bool
Sets the field cursor to the given offset. The next call to mysqli_fetch_field() will retrieve the field definition of the column associated with that offset.
Note:
To seek to the beginning of a row, pass an offset value of zero.
参数
result- 仅以过程化样式：由 mysqli_query()，mysqli_store_result() 或 mysqli_use_result()返回的结果集标识。
fieldnr- The field number. This value must be in the range from
0tonumber of fields - 1.
返回值
成功时返回 true， 或者在失败时返回 false。
范例
Example #1 面向对象风格
<?php$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit();}$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";if ($result = $mysqli->query($query)) { /* Get field information for 2nd column */ $result->field_seek(1); $finfo = $result->fetch_field(); printf("Name: %s\n", $finfo->name); printf("Table: %s\n", $finfo->table); printf("max. Len: %d\n", $finfo->max_length); printf("Flags: %d\n", $finfo->flags); printf("Type: %d\n\n", $finfo->type); $result->close();}/* close connection */$mysqli->close();?>
Example #2 过程化风格
<?php$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit();}$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";if ($result = mysqli_query($link, $query)) { /* Get field information for 2nd column */ mysqli_field_seek($result, 1); $finfo = mysqli_fetch_field($result); printf("Name: %s\n", $finfo->name); printf("Table: %s\n", $finfo->table); printf("max. Len: %d\n", $finfo->max_length); printf("Flags: %d\n", $finfo->flags); printf("Type: %d\n\n", $finfo->type); mysqli_free_result($result);}/* close connection */mysqli_close($link);?>
以上例程会输出：
Name: SurfaceArea Table: Country max. Len: 10 Flags: 32769 Type: 4
