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PHP mysqli: sqlstate() function

mysqli_sqlstate() function / mysqli::$sqlstate

The mysqli_sqlstate() function / mysqli::$sqlstate returns the SQLSTATE error code for the last error.

The error code consists of five characters. "00000" indicates no error. The values are specified by ANSI SQL and ODBC.

Syntax:

Object oriented style

string $mysqli->sqlstate;

Procedural style

string mysqli_sqlstate ( mysqli $link )

Parameter:

Name Description Required/Optional
link A link identifier returned by mysqli_connect() or mysqli_init() Required for procedural style only and Optional for Object oriented style

Usage: Procedural style

mysqli_sqlstate(connection);

Parameter:

Name Description Required/Optional
connection Specifies the MySQL connection to use Required

Return value:

Returns a string containing the SQLSTATE error code for the last error. The error code consists of five characters. '00000' means no error.

Version: PHP 5, PHP 7

Example of object oriented style:

<?php
$mysqli = new mysqli("localhost", "user1", "datasoft123", "hr");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* Table City already exists, so we should get an error */
if (!$mysqli->query("CREATE TABLE City (ID INT, Name VARCHAR(30))")) {
    printf("Error - SQLSTATE %s.\n", $mysqli->sqlstate);
}

$mysqli->close();
?>

Output:

Error - SQLSTATE 42S01.

Example of the Procedural style

<?php
$link = mysqli_connect("localhost", "user1", "datasoft123", "hr");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* Table City already exists, so we should get an error */
if (!mysqli_query($link, "CREATE TABLE City (ID INT, Name VARCHAR(30))")) {
    printf("Error - SQLSTATE %s.\n", mysqli_sqlstate($link));
}

mysqli_close($link);
?>

Output:

Error - SQLSTATE 42S01.

Example:

<?php
$con=mysqli_connect("localhost","user1","datasoft123","hr");
// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }


// Table Persons already exists, so we should get an error
$sql="CREATE TABLE Persons (Firstname VARCHAR(30),Lastname VARCHAR(30),Age INT)"
if (!mysqli_query($con,$sql));
  {
  echo "SQLSTATE error: ". mysqli_sqlstate($con);
  }
// Close connection
mysqli_close($con);
?>

See also

PHP Function Reference

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PHP: Tips of the Day

PHP: How to generate a random, unique, alphanumeric string for use in a secret link?

Security Notice: This solution should not be used in situations where the quality of your randomness can affect the security of an application. In particular, rand() and uniqid() are not cryptographically secure random number generators. See Scott's answer for a secure alternative.

If you do not need it to be absolutely unique over time:

md5(uniqid(rand(), true))

Otherwise (given you have already determined a unique login for your user):

md5(uniqid($your_user_login, true))

Ref : https://bit.ly/31fd9wa

 





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