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La fonction mysqli_query() exécute une requête sur la base de données
mysqli_query()函数接受表示查询的字符串值作为参数之一，并在数据库上执行给定的查询。
mysqli_query($con, query)
| 序号 | 参数及说明 |
|---|---|
| 1 | con(必需) 这是一个表示与MySQL Server的连接的对象。 |
| 2 | query(必需) 这是一个字符串值，表示要执行的查询。 |
| 3 | mode(可选) 这是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。 |
失败时返回 FALSE，通过mysqli_query() 成功执行SELECT, SHOW, DESCRIBE或 EXPLAIN查询会返回一个mysqli_result 对象，其他查询则返回TRUE。
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。
此函数最初是在PHP版本5中引入的，并且可以在所有更高版本中使用。
以下示例演示了mysqli_query()用法（procedural style）-
<?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("Create table ..."."\n");
//Insert the record 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', 'Afrique du Sud')");
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("insert record ..."."\n");
//Fermer la connexion
mysqli_close($con);
?>Résultat de la sortie
Création de la table... insert record ...
If you observe the content of the table in the database, you can see the inserted records as follows:
mysql> select * from my_team; +------+------------+------------+----------------+-------------+ | ID | First_Name | Last_Name | Place_Of_Birth | Country | +------+------------+------------+----------------+-------------+ | 1 | Shikhar | Dhawan | Delhi | India | | 2 | Jonathan | Trott | CapeTown | SouthAfrica | | 3 | Kumara | Sangakkara | Matale | Srilanka | | 4 | Virat | Kohli | Delhi | India | +------+------------+------------+----------------+-------------+ 4 rows in set (0.00 sec)
In the object-oriented style, the syntax of this function is}}$con-> query();。The following is an example of this function in an object-oriented style;
<?php
$con = new mysqli("localhost", "root", "password", "mydb");
//Insert the record 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("Create data......");
//Fermer la connexion
$res = $con -> close();
?>Résultat de la sortie
Create data......
If you observe the content of the table in the database, you can see the inserted records as follows:
mysql> select * from players; +------------+-----------+-------------+ | First_Name | Last_Name | Country | +------------+-----------+-------------+ | Shikhar | Dhawan | India | | Jonathan | Trott | SouthAfrica | +------------+-----------+-------------+ 2 rows in set (0.00 sec)
The following example prints the results of INSERT and SELECT queries-
<?php
//Établir une connexion
$con = mysqli_connect("localhost", "root", "password", "mydb");
mysqli_query($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("Create table ..."."\n");
//Insert the record into the my_team table
$res = mysqli_query($con, "insert into my_team values("1, 'Shikhar', 'Dhawan', 'Delhi', 'India")");
print("insert query result: ", $res, "\n");
$res = mysqli_query($con, "insert into my_team values("2, 'Jonathan', 'Trott', 'CapeTown', 'Afrique du Sud')");
print("Résultat de la requête d'insertion : ").$res;
$res = mysqli_query($con, "SELECT * FROM my_team");
print("Résultat de la requête SELECT : ");
print_r($res);
//Fermer la connexion
mysqli_close($con);
?>Résultat de la sortie
Création de la table... Résultat de la requête d'insertion : 1 Résultat de la requête d'insertion : 1Résultat de la requête SELECT : Objet mysqli_result ( [current_field] => 0 [field_count] => 5 [lengths] => [num_rows] => 2 [type] => 0 )
Supposons que nous ayons déjà créé une table players dans la base de données et qu'elle soit remplie comme suit-
CREATE TABLE Players (Name VARCHAR(255), Age INT, Score INT);
insert into Players values('Dhavan', 33, 9),('Rohit', 28, 26),('Kohli', 25, 50);Le fichier suivant est un exemple d'exécution de requêtes sur une base de données :
<?php
//Établir une connexion
$con = mysqli_connect("localhost", "root", "password", "mydb");
//Exécuter plusieurs requêtes
$query = "SELECT * FROM players";
//Recherche d'enregistrements
$res = mysqli_query($con, $query, MYSQLI_USE_RESULT);
if ($res) {
while ($row = mysqli_fetch_row($res)) {
print("Nom : ".$row[0]."\n");
print("Âge : ".$row[1]."\n");
}
}
//Fermer la connexion
mysqli_close($con);
?>Résultat de la sortie
Nom : Dhavan Âge : 33 Nom : Rohit Âge : 28 Nom : Kohli Âge : 25