PHP | mysqli_stmt_result_metadata() 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_stmt_result_metadata() Function.

The PHP mysqli_stmt_result_metadata() function accepts a prepared statement object as a parameter and, if the given executes a SELECT query (or any other query that returns resultset), this function returns a metadata object which contains information about the resultset of the given statement.

Syntax

Following below is the syntax to use this function -

mysqli_stmt_result_metadata($stmt);

READ: PHP | mysqli_stmt_num_rows() Function

Parameter Details

Sr.No	Parameter & Description
1	stmt(Mandatory) This is an object representing a prepared statement.

Return Value

This function returns a metadata object on success and FALSE on failure.

PHP Version

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

Example1

The following below is an example which demonstrates the usage of the built-in PHP mysqli_stmt_result_metadata() function (in a procedural style) -

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

   mysqli_query($con, "CREATE TABLE test(Name VARCHAR(255), age INT)");
   mysqli_query($con, "INSERT INTO test values('Kennedy', 27)");
   mysqli_query($con, "INSERT INTO test values('Paul', 30)");
   print("Table Created.....\n");

   //Retrieving the contents of the table
   $stmt = mysqli_prepare($con, "SELECT * FROM test");

   //Executing the statement
   mysqli_stmt_execute($stmt);

   //Retrieving the resultset metadata
   $metadata = mysqli_stmt_result_metadata($stmt);
   print_r(mysqli_fetch_fields($metadata));
 
   mysqli_free_result($metadata);

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

Output

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

Table Created.....
Array
(
    [0] => stdClass Object
        (
            [name] => Name
            [orgname] => Name
            [table] => test
            [orgtable] => test
            [def] =>
            [db] => mydb
            [catalog] => def
            [max_length] => 0
            [length] => 765
            [charsetnr] => 33
            [flags] => 0
            [type] => 253
            [decimals] => 0
        )

    [1] => stdClass Object
        (
            [name] => AGE
            [orgname] => AGE
            [table] => test
            [orgtable] => test
            [def] =>
            [db] => mydb
            [catalog] => def
            [max_length] => 0
            [length] => 11
            [charsetnr] => 63
            [flags] => 32768
            [type] => 3
            [decimals] => 0
        )

)

Example2

In an object oriented style the syntax of this built-in function is $stmt->result_metadata(); Following is the example of this function in an object oriented style -

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

   $con -> query("CREATE TABLE Test(Name VARCHAR(255), AGE INT)");
   $con -> query("insert into Test values('Kennedy', 27),('Paul', 30),('Justice', 28)");
   print("Table Created.....\n");

   $stmt = $con -> prepare( "SELECT * FROM Test WHERE Name in(?, ?)");
   $stmt -> bind_param("ss", $name1, $name2);
   $name1 = 'Kennedy';
   $name2 = 'Paul';
   print("Records Inserted.....\n");

   //Executing the statement
   $stmt->execute();

   //Retrieving the resultset metadata
   $metadata = $stmt->result_metadata();

   $field = $metadata->fetch_field();
   print("Field Name: ".$field->name);

   //Closing the statement
   $stmt->close();

   //Closing the connection
   $con->close();
?>

Output

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

Table Created.....
Record Inserted.....
Field Name: Name

READ: PHP | mysqli_stmt_reset() Function

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_stmt_send_long_data() Function in PHP.

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