如何从我刚执行的MYSQL插入中获取主ID？

Question

可能重复：
Select last insert id
Retrieving the last insert id from MySql using PHP

我想从一个插入我执行UNIQUE_ID。在我的MySQL数据库中，column_1是一个唯一的ID，每次插入时都会自动递增。

我认为答案与$ mysqli-> insert_id有关，但我不确定它应该放在哪里。下面是我使用，使插入代码：

// Add the user to the database: 
$q = "INSERT INTO database_name (column_2, column_3, column_4) VALUES ('$val1', '$val2', '$val3')"; 
$r = mysqli_query ($dbc, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($dbc)); 

if (mysqli_affected_rows($dbc) == 1) { // If it ran OK. 

    $_SESSION['column_2'] = $val1; 
    $_SESSION['column_3'] = $val2; 
    $_SESSION['column_4'] = $val3; 

    //Do whatever 

    //Go-to page 

    $url = BASE_URL . 'url-address-of-thank-you-page'; . 
    ob_end_clean(); // Delete the buffer. 
    header("Location: $url"); 

    exit(); // Stop the page. 

} else { // If it did not run OK. 
    echo '<div class="error"><p>You could not be registered due to a system error. We apologize for any inconvenience.</p></div>'; 
} 

这里是工作代码：

... 
    $_SESSION['column_1'] = $dbc->insert_id; 
    $_SESSION['column_2'] = $val1; 
    $_SESSION['column_3'] = $val2; 
    $_SESSION['column_4'] = $val3; 

... 

Answer 1

你几乎回答了你自己的问题，mysql_insert_id()是你以后的功能：

// Add the user to the database: 
$q = "INSERT INTO database_name (column_2, column_3, column_4) VALUES ('$val1', '$val2', '$val3')"; 
$r = mysqli_query ($dbc, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($dbc)); 

if (mysqli_affected_rows($dbc) == 1) { // If it ran OK. 

    $_SESSION['column_1'] = mysqli_insert_id($dbc); 
    $_SESSION['column_2'] = $val1; 
    $_SESSION['column_3'] = $val2; 
    $_SESSION['column_4'] = $val3; 

Answer 2

使用LAST_INSERT_ID()功能。