PHP mysqli_info()用法及代碼示例

定義和用法

這個mysqli_info()函數返回有關最近 MySQLi 函數調用執行的查詢的信息。此函數僅支持以下格式的查詢：

• 插入...選擇....

• 插入...值 (...),(...),(...)。

• 加載數據文件....

• 更改表....

• 更新 ....

用法

mysqli_info($con)

參數

Sr.No	參數及說明
1	con(Mandatory) 這是一個表示與 MySQL 服務器的連接的對象。

返回值

PHP mysqli_info() 函數返回一個字符串值，表示最近執行的查詢的描述/信息。如果執行的最新查詢不是受支持的查詢之一，則此函數返回一個空字符串。

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_info() 函數的用法(程序風格) -

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

   //Query to insert a record into the employee table
   mysqli_query($con, "INSERT INTO employee VALUES ('Sarmista', 'Sharma', 28, 'F', 15000,  101), ('Sheldon', 'Cooper', 25, 'M', 2256,  102)");

   //Query Info
   $error = mysqli_info($con);
   print("Query Info:".$error);

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

這將產生以下結果 -

Query Info:Records:2  Duplicates:0  Warnings:0

示例

在麵向對象的風格中，這個函數的語法是 $con ->info。以下是麵向對象風格的此函數的示例 -

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

   //Query to retrieve all the rows of employee table
   $con -> query("INSERT INTO employee VALUES ('Sarmista', 'Sharma', 28, 'F', 15000,  101), ('Sheldon', 'Cooper', 25, 'M', 2256,  102)");

   //Query Info
   $info = $con ->info;
   print("Query Info:".$info);

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

這將產生以下結果 -

Query Info:Records:2  Duplicates:0  Warnings:0

示例

以下是 mysqli_info() 函數的另一個示例 -

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

   //ALTER TABLE Query
   mysqli_query($con, "ALTER TABLE table_name DROP COLUMN CONTACT");
   print("Info:".mysqli_info($con)."\n");

   //UPDATE Query
   mysqli_query($con, "UPDATE employee set INCOME=INCOME+5000");
   print("Info:".mysqli_info($con)."\n");

   //INSERT Query
   mysqli_query($con, "INSERT INTO employee (FIRST_NAME, AGE) VALUES (Archana, 25), (Bhuvan, 29)");
   print("Info:".mysqli_info($con)."\n");

   //INSERT Query using SELECT
   mysqli_query($con, "INSERT into employee(FIRST_NAME, LAST_NAME, AGE) select 'Manoj', 'Tiwari', 45");
   print("Info:".mysqli_info($con)."\n");

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

這將產生以下結果 -

Info:
Info:Rows matched:3  Changed:3  Warnings:0
Info:Rows matched:3  Changed:3  Warnings:0
Info:Records:1  Duplicates:0  Warnings:0

示例

<?php
   $connection_mysql = mysqli_connect("localhost","root","password","mydb");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL:" . mysqli_connect_error();
   }
   
   $sql1 = "CREATE TABLE NewTable SELECT * FROM(employee)";
   mysqli_query($connection_mysql,$sql1);
   
   echo mysqli_info($connection_mysql);  
   
   mysqli_close($connection_mysql);
?>

這將產生以下結果 -

Records:7  Duplicates:0  Warnings:0