Question

有人可以告诉我如何纠正这个不断给我sql语法错误的查询吗？

致命错误：mysqli_sql_exception未捕获：您的错误 SQL语法；检查与您的MariaDB服务器相对应的手册在'？'附近使用正确语法的版本在第1行 C：\ xampp \ htdocs \ test \ browsing_histories.php：38堆栈跟踪：＃0 C：\ xampp \ htdocs \ test \ browsing_histories.php（38）：mysqli-> query（'SELECT * FROM b ...'）＃1 {main}在第38行的C：\ xampp \ htdocs \ test \ browsing_histories.php中抛出

我需要这样做，所以我不必写数百个查询，而只写一个。数百个查询，每个查询用于每个列查询。例如

$total_pages = $conn->query("SELECT * FROM browsing_histories WHERE USERNAME = ? ")->num_rows; 

$total_pages = $conn->query("SELECT * FROM browsing_histories WHERE FIRST_NAME = ? ")->num_rows; 

$total_pages = $conn->query("SELECT * FROM browsing_histories WHERE GENDER = ? ")->num_rows; 

$total_pages = $conn->query("SELECT * FROM browsing_histories WHERE AGE-RANGE = ? ")->num_rows;

依此类推...

一个查询应该像对待未准备好的语句一样执行此操作。因此，它是这样的：

$stmt = $conn->prepare('SELECT * FROM browsing_histories WHERE $query_type = ? 
ORDER BY id LIMIT ?,?');

全文：

$query_type = $_GET['query_type']; 

//If $_GET['query_type']) is empty then show error as it must be set. 
if(!isset($_GET['query_type']) && empty($_GET['query_type'])) 
{ 
    echo "Invalid Query!"; 
} 
//If $_GET['query_type']) is full with value other than wild-card or "All" 
or "all" then make speccific query. 
elseif($query_type != 'all' OR $query_type != 'All' OR $query_type != '*') 
{ 
    ${$query_type} = $_GET[$_GET['query_type']]; 
    $followed_word = ${$query_type}; //Same as: $_GET[$_GET['query_type']]; 

    $total_pages = $conn->query("SELECT * FROM browsing_histories WHERE 
$query_type = ?")->num_rows; 
    //Make the query. 
    $stmt = $conn->prepare('SELECT * FROM browsing_histories WHERE 
$query_type = ? ORDER BY id LIMIT ?,?'); 
    $stmt->bind_param('sii', $query_type, $calc_page, $num_results_on_page); 
} 
else //Make general query or query for all records. 
{ 
    //Grab "all records" from the table. 
    //Get the total number of records from the table: 
"browsing_histories". 
    $total_pages = $conn->query("SELECT * FROM browsing_histories")- 
>num_rows; 
    //Make the query. 
    $stmt = $conn->prepare('SELECT * FROM browsing_histories ORDER BY id 
LIMIT ?,?'); 
    $stmt->bind_param('ii', $num_results_on_page); 
} 

$stmt->execute();

注意：即使我将准备好的语句查询中的$ query_type更改为实际的列名（例如“用户名”），我仍然会遇到相同的错误。

$stmt = $conn->prepare('SELECT * FROM browsing_histories WHERE username = 
? 
ORDER BY id LIMIT ?,?');

编辑1：修复了我的代码，但没有运气！

$query_type = $_GET['query_type']; 

//If $_GET['query_type']) is empty then show error as it must be set. 
if(!isset($_GET['query_type']) && empty($_GET['query_type'])) 
{ 
    echo "Invalid Query!"; 
} 
//If $_GET['query_type']) is full with value other than wild-card or 
"All" or "all" then make speccific query. 
elseif($query_type != 'all' OR $query_type != 'All' OR $query_type != 
'*') 
{ 
    ${$query_type} = $_GET[$_GET['query_type']]; 
    $followed_word = ${$query_type}; //Same as: 
$_GET[$_GET['query_type']]; 

    $total_pages = $conn->query("SELECT * FROM browsing_histories WHERE 
username = ?")->num_rows; 
    //Make the query. 
    $stmt = $conn->prepare('SELECT * FROM browsing_histories WHERE 
username = ? ORDER BY id LIMIT ?,?'); 
    $stmt->bind_param('sii', $query_type, $calc_page, 
$num_results_on_page); 
} 
else //Make general query or query for all records. 
{ 
    //Grab "all records" from the table. 
    //Get the total number of records from the table: 
"browsing_histories". 
    $total_pages = $conn->query("SELECT * FROM browsing_histories")- 
>num_rows; 
    //Make the query. 
    $stmt = $conn->prepare('SELECT * FROM browsing_histories ORDER BY id 
LIMIT ?,?'); 
    $stmt->bind_param('ii', $calc_page, $num_results_on_page); 
} 

$stmt->execute();

编辑2：这是我的最新更新。问题仍然存在。注释掉的查询是我尝试过的查询。他们都显示错误相同。未注释掉的也显示错误。

    $query_type = $_GET['query_type']; 

    //If $_GET['query_type']) is empty then show error as it must be set. 
    if(!isset($_GET['query_type']) && empty($_GET['query_type'])) 
    { 
        echo "Invalid Query!"; 
    } 
    //If $_GET['query_type']) is full with value other than wild-card or 
    "All" or "all" then make speccific query. 
    elseif($query_type != 'all' OR $query_type != 'All' OR $query_type != 
    '*') 
    { 
    ${$query_type} = $_GET[$_GET['query_type']]; 
    $followed_word = ${$query_type}; //Same as: 
    $_GET[$_GET['query_type']]; 

    //$total_pages = $conn->query("SELECT * FROM browsing_histories WHERE 
    ? = ?")->num_rows; 
    //$total_pages = $conn->query("SELECT * FROM browsing_histories WHERE 
    \"$query_type\" = ?")->num_rows; 
    $total_pages = $conn->query("SELECT * FROM browsing_histories WHERE 
    $query_type = ?")->num_rows; 
    $stmt->bind_param('i', ${$query_type}); 
    $stmt->execute(); 
    //Make the query. 
    //$stmt_2 = $conn->prepare("SELECT * FROM browsing_histories WHERE ? 
    = ? ORDER BY id LIMIT ?,?"); 
    //$stmt_2 = $conn->prepare("SELECT * FROM browsing_histories WHERE 
    \"$query_type\" = ? ORDER BY id LIMIT ?,?"); 
    //$stmt_2 = $conn->prepare("SELECT * FROM browsing_histories WHERE 
    $query_type = ? ORDER BY id LIMIT ?,?"); 
    $stmt_2 = $conn->prepare("SELECT * FROM browsing_histories WHERE 
    username = ? ORDER BY id LIMIT ?,?"); 

    //$stmt_2->bind_param('sii', $query_type, ${$query_type}, $calc_page, 
    $num_results_on_page); 
    $stmt_2->bind_param('sii', ${$query_type}, $calc_page, 
    $num_results_on_page); 
    } 
    else //Make general query or query for all records. 
    { 
        //Grab "all records" from the table. 
        //Get the total number of records from the table: 
        "browsing_histories". 
        $total_pages = $conn->query("SELECT * FROM browsing_histories")- 
        >num_rows; 
        //Make the query. 
        $stmt = $conn->prepare('SELECT * FROM browsing_histories ORDER BY 
        id LIMIT ?,?'); 
        $stmt->bind_param('ii', $calc_page, $num_results_on_page); 
        } 

        $stmt->execute();

Answer 1

两个参数需要两个值

$stmt->bind_param('ii', $num_results_on_page, $second_value);

，对于这3个参数3个值

$stmt = $conn->prepare('SELECT * FROM browsing_histories WHERE username = ? 
ORDER BY id LIMIT ?,?'); 

$stmt->bind_param('sii',$your_username_value, $num_results_on_page, $second_value);

并检查

的代码

 $total_pages = $conn->query("SELECT * FROM browsing_histories WHERE username = ?")->num_rows;

似乎也没有参数

尝试在Php准备好的语句中添加变量时出错

1 个答案: