PHP mysqli_data_seek() 函数

定义和用法

PHP 结果对象（类 mysqli_result）表示 MySQL 结果，由 SELECT 或 DESCRIBE 或 EXPLAIN 查询返回。

mysqli_data_seek() 函数接受结果对象和表示偏移量的整数值作为参数，并将给定结果对象的 data seek 移动到指定的行。

语法

mysqli_data_seek($result, $offset);

参数

返回值

PHP mysqli_data_seek() 函数返回一个布尔值，在成功的情况下为 TRUE，在失败的情况下为 FALSE。

PHP 版本

此函数首次在 PHP 5 版本中引入，并在所有后续版本中均有效。

示例

以下示例演示了 mysqli_data_seek() 函数（以过程式风格）的用法：

<?php
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   mysqli_query($con, "CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created.....\n");
   mysqli_query($con, "INSERT INTO myplayers values(1, 'Sikhar', 'Dhawan', 'Delhi', 'India')");
   mysqli_query($con, "INSERT INTO myplayers values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   mysqli_query($con, "INSERT INTO myplayers values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
   print("Record Inserted.....\n");

   //Retrieving the contents of the table
   $res = mysqli_query($con, "SELECT * FROM myplayers");

   //Seek to 2nd row
   mysqli_data_seek($res, 1);

   //Fetching the contents of the row
   $row = mysqli_fetch_row($res);
   print_r($row);

   //Closing the statement
   mysqli_free_result($res);

   //Closing the connection
   mysqli_close($con);
?>

这将产生以下结果：

Table Created.....
Record Inserted.....
Array
(
    [0] => 2
    [1] => Jonathan
    [2] => Trott
    [3] => CapeTown
    [4] => SouthAfrica
)

示例

在面向对象风格中，此函数的语法为 $result->data_seek; 以下是此函数在面向对象风格中的示例：

<?php
   //Creating a connection
   $con = new mysqli("localhost", "root", "password", "mydb");

   $con -> query("CREATE TABLE Test(Name VARCHAR(255), AGE INT)");
   $con -> query("insert into Test values('Raju', 25),('Rahman', 30),('Sarmista', 27)");
   $con -> query("insert into Test values('Mohan', 28),('Raghav', 35),('Devika', 30)");

   print("Table Created.....\n");

   $stmt = $con -> prepare( "SELECT * FROM Test WHERE Name in(?, ?, ?, ?)");
   $stmt -> bind_param("ssss", $name1, $name2, $name3, $name4);
   $name1 = 'Raju';
   $name2 = 'Rahman';
   $name3 = 'Raghav';
   $name4 = 'Devika';

   //Executing the statement
   $stmt->execute();

   //Retrieving the result
   $res = $stmt->get_result();

   //Seek to 3rd row
   $res->data_seek(2);

   //Fetching the contents of the row
   $row = $res->fetch_row();
   print_r($row);

   //Closing the statement
   $stmt->close();

   //Closing the connection
   $con->close();
?>

这将产生以下结果：

Table Created.....
Array
(
    [0] => Raghav
    [1] => 35
)