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.
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.No | Parameter & 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.
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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