PHP mysqli_stmt_num_rows()用法及代碼示例

定義和用法

這個mysqli_stmt_num_rows()函數接受一個語句對象作為參數，並返回給定語句結果集中的行數。

用法

mysqli_stmt_num_rows($stmt)

參數

Sr.No	參數及說明
1	stmt(Mandatory) 這是一個對象，表示執行 SQL 查詢的語句。

返回值

PHP mysqli_stmt_num_rows() 函數返回一個整數值，指示語句返回的結果集中的行數。

PHP版本

這個函數最初是在 PHP 版本 5 中引入的，適用於所有後續版本。

示例

以下示例演示了 mysqli_stmt_num_rows() 函數的用法(程序風格) -

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

   mysqli_query($con, "CREATE TABLE Test(Name VARCHAR(255), AGE INT)");
   print("Table Created.....\n");
   mysqli_query($con, "insert into Test values('Raju', 25),('Rahman', 30),('Sarmista', 27)");
   print("Records Inserted.....\n");

   //Reading records
   $stmt = mysqli_prepare($con, "SELECT * FROM Test");

   //Executing the statement
   mysqli_stmt_execute($stmt);

   mysqli_stmt_store_result($stmt);

   //Number of rows
   $count = mysqli_stmt_num_rows($stmt);

   print("Number of rows in the table:".$count."\n");

   //Closing the statement
   mysqli_stmt_close($stmt);

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

這將產生以下結果 -

Table Created.....
Records Inserted.....
Number of rows in the table:3

示例

在麵向對象的風格中，這個函數的語法是 $con->num_rows;以下是麵向對象樣式 $minus 中此函數的示例；

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

   $con -> query("CREATE TABLE Test(Name VARCHAR(255), AGE INT)");
   print("Table Created.....\n");
   $con -> query("insert into Test values('Raju', 25),('Rahman', 30),('Sarmista', 27)");
   print("Records Inserted.....\n");

   $stmt = $con -> prepare( "SELECT * FROM Test");

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

   $stmt->store_result();

   //Number of rows
   $count = $stmt ->num_rows;
   print("Rows affected ".$count);

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

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

這將產生以下結果 -

Table Created.....
Records Inserted.....
Number of rows in the table:3

示例

假設我們創建了一個名為 cricketers 的表，其中包含以下數據 $minus;

mysql> select * from cricketers;
+----+------------+------------+---------------+----------------+
| ID | First_Name | Last_Name  | Date_Of_Birth | Place_Of_Birth |
+----+------------+------------+---------------+----------------+
|  1 | Shikhar    | Dhawan     | 1981-12-05    | Delhi          |
|  2 | Jonathan   | Trott      | 1981-04-22    | CapeTown       | 
|  3 | Kumara     | Sangakkara | 1977-10-27    | Matale         |
|  4 | Virat      | Kohli      | 1988-11-05    | Delhi          |
|  5 | Rohit      | Sharma     | 1987-04-30    | Nagpur         |
|  6 | Ravindra   | Jadeja     | 1988-12-06    | Nagpur         |
+----+------------+------------+---------------+----------------+
6 rows in set (0.07 sec)

如果您嘗試直接調用此函數，由於結果尚未存儲，它返回 0 -

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

   //Reading records
   $stmt = mysqli_prepare($con, "SELECT * FROM cricketers");

   //Executing the statement
   mysqli_stmt_execute($stmt);

   print("Number of rows in the table:".mysqli_stmt_num_rows($stmt));

   //Closing the statement
   mysqli_stmt_close($stmt);

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

這將產生以下結果 -

Number of rows in the table:0