PHP | mysqli_query() Function

PHP mysqli_query() Function


Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP mysqli_query() Function.

The PHP mysqli_query() function accepts a string value representing a query as one of the parameters and, executes and performs the given query on the database.

Syntax

Following below is the syntax to use this function -

mysqli_query($con,  query)


Parameter Details

Sr.NoParameter & Description
1

con(Mandatory)

This is an object representing a connection to MySQL Server.

2

query(Mandatory)

This is a string value representing the query to be executed.

3

mode(Optional)

This is a integer value representing the result mode. You can pass MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT as values to this parameter.


Return Value

For SELECT, SHOW, DESCRIBE and then the EXPLAIN queries, this built-in PHP function returns a mysqli_result() object holding the result of the query on success and, false on failure.

For other queries this PHP function returns true if the operation/query is successful or, false if not.

PHP Version

This PHP function was first introduced in PHP version 5 and it works in all the later versions.

Example1

The following example demonstrates the usage of the PHP mysqli_query() function (in 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("Table Created ....."."\n");

   //Inserting a records into the my_team table
   mysqli_query($con, "insert into my_team values(1, 'Kennedy', 'Nkpara', 'PortHarcourt', 'Nigeria')");
   mysqli_query($con, "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   mysqli_query($con, "insert into my_team values(3, 'Queen', 'Dauglas', 'Texas', 'UnitedStates')");
   mysqli_query($con, "insert into my_team values(4, 'Paul', 'Francis', 'Texas', 'UnitedStates')");

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

Output

When the above code is executed, it will produce the following result -

Table Created......
 Record Inserted......

If you observe the contents of the table in the database you can now see the inserted records as shown below -

mysql> select * from my_team;
+------+------------+------------+----------------+-------------+
| ID   | First_Name | Last_Name  | Place_Of_Birth | Country     |
+------+------------+------------+----------------+-------------+
|    1 | Kennedy    | Nkpara     | PortHarcourt   | Nigeria     |
|    2 | Jonathan   | Trott      | CapeTown       | SouthAfrica |
|    3 | Queen      | Dauglas    | Texas          | UnitedStates|
|    4 | Paul       | Francis    | Texas          | UnitedStates|
+------+------------+------------+----------------+-------------+
4 rows in set (0.00 sec)

Example2

In an object oriented style the syntax of this built-in PHP function is $con->query(); The following below is an example of this PHP function in an object oriented style $minus;

<?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('Kennedy', 'Nkpara', 'Nigeria')");
   $con->query("insert into players values('Jonathan', 'Trott', 'SouthAfrica')");

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

Output

When the above code is executed, it will produce the following result -

Data Created........

If you observe the contents of the table in the database, you can now see the inserted records as shown below -

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

Example3

Following example below prints the results of INSERT and SELECT queries -

<?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, 'Kennedy', 'Nkpara', 'PortHarcourt', 'Nigeria')");
   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);
?>

Output

When the above code is executed, it will produce the following result below -

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
)

Example4

Assume we have created a table players in the database and populated it, as shown below -

CREATE TABLE Players (Name VARCHAR(255), Age INT, Score INT);
insert into Players values('Prince', 28, 90),('Bethel', 27, 26),('Stephanie', 24, 50);

The following example below retrieves the resultset from the built-in mysqli_query() function -

<?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);
?>

Output

When the above code is executed, it will produce the following result below -

Name: Prince
Age: 28
Name: Bethel
Age: 27
Name: Stephanie
Age: 24


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the mysqli_real_connect() Function in PHP.

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