PHP mysqli_query() 函式

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定義和用法

mysqli_query() 函式接受一個表示查詢的字串值作為引數之一，並在資料庫上執行/執行給定的查詢。

語法

mysqli_query($con, query)

引數

返回值

對於 SELECT、SHOW、DESCRIBE 和 EXPLAIN 查詢，此函式在成功的情況下返回一個mysqli_result物件，其中包含查詢的結果，如果失敗則返回 false。

對於其他查詢，此函式返回一個布林值，如果操作/查詢成功則為true，否則為false。

PHP 版本

此函式首次引入於 PHP 5 版本，並在所有後續版本中均有效。

示例

以下示例演示了mysqli_query()函式（以過程式風格）的用法：

<?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);
?>

這將產生以下結果：

Table Created ...
Records Inserted ...

如果您觀察資料庫中表的內容，您可以看到插入的記錄，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

在面向物件風格中，此函式的語法為$con->query();以下是此函式在面向物件風格中的示例：

<?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();
?>

這將產生以下結果：

Data Created......

如果您觀察資料庫中表的內容，您可以看到插入的記錄，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

以下示例列印 INSERT 和 SELECT 查詢的結果：

<?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);
?>

這將產生以下結果：

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

假設我們在資料庫中建立了一個名為 players 的表並對其進行了填充，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);

以下示例從

mysqli_multi_query

函式中檢索結果集：

<?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);
?>

這將產生以下結果：

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