PHP mysqli_query()用法及代码示例

定义和用法

这个mysqli_query()函数接受一个表示查询的字符串值作为参数之一，并在数据库上执行/执行给定的查询。

用法

mysqli_query($con, query)

参数

Sr.No	参数及说明
1	con(Mandatory) 这是一个表示与 MySQL 服务器的连接的对象。
2	query(Mandatory) 这是一个字符串值，表示要执行的查询。
3	mode(Optional) 这是一个表示结果模式的整数值。您可以将 MYSQLI_USE_RESULT 或 MYSQLI_STORE_RESULT 作为值传递给此参数。

返回值

对于 SELECT、SHOW、DESCRIBE 和 EXPLAIN 查询，此函数返回一个 mysqli_result 对象，如果成功则保存查询结果，如果失败则返回 false。

对于其他查询，此函数返回一个布尔值，如果操作/查询成功，则为 true，否则为 false。

PHP版本

这个函数最初是在 PHP 版本 5 中引入的，适用于所有后续版本。

示例

以下示例演示了 mysqli_query() 函数的用法(程序风格) -

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

   mysqli_query($con, "CREATE TABLE IF NOT EXISTS my_team(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created ..."."\n");

   //Inserting a records into the my_team table
   mysqli_query($con, "insert into my_team values(1, 'Shikhar', 'Dhawan', 'Delhi', 'India')");
   mysqli_query($con, "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   mysqli_query($con, "insert into my_team values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
   mysqli_query($con, "insert into my_team values(4, 'Virat', 'Kohli', 'Delhi', 'India')");

   print("Records Inserted ..."."\n");
  
   //Closing the connection
   mysqli_close($con);
?>

这将产生以下结果 -

Table Created ...
Records Inserted ...

如果您观察数据库中表的内容，您可以看到插入的记录，如下所示 -

mysql> select * from my_team;
+------+------------+------------+----------------+-------------+
| ID   | First_Name | Last_Name  | Place_Of_Birth | Country     |
+------+------------+------------+----------------+-------------+
|    1 | Shikhar    | Dhawan     | Delhi          | India       |
|    2 | Jonathan   | Trott      | CapeTown       | SouthAfrica |
|    3 | Kumara     | Sangakkara | Matale         | Srilanka    |
|    4 | Virat      | Kohli      | Delhi          | India       |
+------+------------+------------+----------------+-------------+
4 rows in set (0.00 sec)

示例

在面向对象的风格中，这个函数的语法是 $con->query();以下是面向对象样式 $minus 中此函数的示例；

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

   //Inserting a records into the players table
   $con->query("CREATE TABLE IF NOT EXISTS players(First_Name VARCHAR(255), Last_Name VARCHAR(255), Country VARCHAR(255))");
   $con->query("insert into players values('Shikhar', 'Dhawan', 'India')");
   $con->query("insert into players values('Jonathan', 'Trott', 'SouthAfrica')");

   print("Data Created......");
   //Closing the connection
   $res = $con -> close();
?>

这将产生以下结果 -

Data Created......

如果您观察数据库中表的内容，您可以看到插入的记录，如下所示 -

mysql> select * from players;
+------------+-----------+-------------+
| First_Name | Last_Name | Country     |
+------------+-----------+-------------+
| Shikhar    | Dhawan    | India       |
| Jonathan   | Trott     | SouthAfrica |
+------------+-----------+-------------+
2 rows in set (0.00 sec)

示例

以下示例打印 INSERT 和 SELECT 查询的结果 -

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

   mysqli_query($con, "CREATE TABLE IF NOT EXISTS my_team(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created ..."."\n");

   //Inserting a records into the my_team table
   $res = mysqli_query($con, "insert into my_team values(1, 'Shikhar', 'Dhawan', 'Delhi', 'India')");
   print("Result of Insert Query:".$res."\n");
   $res = mysqli_query($con, "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   print("Result of Insert Query:".$res);

   $res = mysqli_query($con, "SELECT * FROM my_team");
   print("Result of the SELECT query:");
   print_r($res);

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

这将产生以下结果 -

Table Created ...
Result of Insert Query:1
Result of Insert Query:1Result of the SELECT query:mysqli_result Object
(
    [current_field] => 0
    [field_count] => 5
    [lengths] =>
    [num_rows] => 2
    [type] => 0
)

示例

假设我们在数据库中创建了一个表玩家并填充它，如下所示 -

CREATE TABLE Players (Name VARCHAR(255), Age INT, Score INT);
   insert into Players values('Dhavan', 33, 90),('Rohit', 28, 26),('Kohli', 25, 50);

以下示例从

mysqli_multi_query

函数 -

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

   //Executing the multi query
   $query = "SELECT * FROM players";
 
   //Retrieving the records
   $res = mysqli_query($con, $query, MYSQLI_USE_RESULT);
   if ($res) {
      while ($row = mysqli_fetch_row($res)) {
         print("Name:".$row[0]."\n");
         print("Age:".$row[1]."\n");
      }
   }

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

这将产生以下结果 -

Name:Dhavan
Age:33
Name:Rohit
Age:28
Name:Kohli
Age:25