Question

我最近从mysql切换到mysqli并开始使用预处理语句。在mysql中我们做

$result = mysql_query("SELECT * FROM table WHERE id = ?");

因此我们将整个表的数组放在一个变量中。

但是在mysqli中我们做了

mysqli_stmt_bind_result($stmt, $result);

所以基本上这里只有一个变量绑定到变量结果。我们如何获得从mysql获得的相同变量（数组）？ PS - 希望我的问题很清楚。我知道他们的方法可能不多，但我正在寻找最好的方法。
PSS - 我对程序方式更加满意。

Answer 1

最后这段代码正在工作!!!!!

  <?php 
    $host = 'localhost'; 
    $user = 'root'; 
    $pass = '1234'; 
    $data = 'test'; 

    $mysqli = new mysqli($host, $user, $pass, $data); 
    /* check connection */ 
    if (mysqli_connect_errno()) { 
        printf("Connect failed: %s\n", mysqli_connect_error()); 
        exit(); 
    } 

    if ($stmt = $mysqli->prepare("SELECT * FROM sample WHERE t2 LIKE ?")) { 
        $tt2 = '%'; 

        $stmt->bind_param("s", $tt2); 
        $stmt->execute(); 

        $meta = $stmt->result_metadata(); 
        while ($field = $meta->fetch_field()) 
        { 
            $params[] = &$row[$field->name]; 
        } 

        call_user_func_array(array($stmt, 'bind_result'), $params); 

        while ($stmt->fetch()) { 
            foreach($row as $key => $val) 
            { 
                $c[$key] = $val; 
            } 
            $result[] = $c; 
        } 

        $stmt->close(); 
    } 
    $mysqli->close(); 
    print_r($result); 
    ?>

Answer 2

像这样使用

$con=mysqli_connect( "$host", "$mysql_u", "$mysql_p","$mysql_db");/*these variables are ur host,username, password and db name*/
    $val="SELECT * FROM table";
    $ex=mysqli_query($con,$val);
    while ($row = mysqli_fetch_assoc($ex)) {

    $ans=$row['col1'];
    ....
    }

Answer 3

将准备好的陈述用作..

$stmt = $mysqli->prepare("SELECT id, label FROM test WHERE id = 1");
$stmt->execute();
$res = $stmt->get_result();
$row = $res->fetch_assoc();

printf("id = %s (%s)\n", $row['id'], gettype($row['id']));
printf("label = %s (%s)\n", $row['label'], gettype($row['label']));

Answer 4

<强> MySQL的：

$result = mysql_query("SELECT * FROM table");

<强>的mysqli ：

$result = mysqli_query("SELECT * FROM table");

请注意您提供的示例不使用预先准备好的声明。

但是如果你想使用mysqli_stmt_bind_result并且当时返回一个数组而不是一列，你可能需要将它包装成你自己的自定义函数。

好消息是bottom of the docs的例子很少，但它们是在OOP中，（时间要切换？）。

$result = mysql_query("SELECT * FROM table WHERE id = ?");


/* create a prepared statement */
if ($stmt = mysqli_prepare($link, "SELECT col1, col2  FROM table WHERE id = ?")) {

    /* bind parameters for markers */
    mysqli_stmt_bind_param($stmt, "s", $city);

    /* execute query */
    mysqli_stmt_execute($stmt);


    /* fetch associative array */
    while ($row = mysqli_fetch_assoc($stmt)) {
        printf ("%s (%s)\n", $row["col1"], $row["col2"]);
    }


}else{
    echo "prepared failed";
}

Answer 5

PHP的variable argument list (ellipsis) operator可以方便地动态替换已准备好的语句：

_tkinter.TclError: couldn't open "2.jpg": no such file or directory
>>> canv.create_image(20,20, anchor=NW, image=img)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'img' is not defined

一个例子：

mysqli_stmt_bind_param($stmt, $params_types, ...$params);

更好地结合到函数中

$sql = 'SELECT * FROM Table WHERE one = ? AND two = ?';
$params_types = 'ii';
$params = array(1, 2);

// prepare
$stmt = mysqli_stmt_init($dbconn_read);
if ( mysqli_stmt_prepare($stmt, $sql) ) {

  // bind and execute
  mysqli_stmt_bind_param($stmt, $params_types, ...$params); // unpack array into arguments
  mysqli_stmt_execute($stmt);

  // get column names for binding return results
  $resultmeta = mysqli_stmt_result_metadata($stmt);
  list($columns, $columns_vars) = array(array(), array());
  while ( $field = mysqli_fetch_field($resultmeta) ) {
    $columns[] = $field->name;
    $columns_vars[] = &${'column_' . $field->name};
  }

  // call bind function with arguments in array
  call_user_func_array('mysqli_stmt_bind_result', array_merge(array($stmt), $columns_vars));

  // get return results
  $return_array = array();
  while ( mysqli_stmt_fetch($stmt) ) {
    $row = array();
    foreach ( $columns as $col ) {
      $row[$col] = ${'column_' . $col}; // populate assoc. array with data
    }
    $return_array[] = $row; // push row data onto return array
  }
}

这样称呼它：

function db_query(&$dbconn, $sql, $params_types, ...$params) { // pack dynamic number of remaining arguments into array

  // GET QUERY TYPE
  $query_type = strtoupper(substr(trim($sql), 0, 4));

  $stmt = mysqli_stmt_init($dbconn);
  if ( mysqli_stmt_prepare($stmt, $sql) ) {
    mysqli_stmt_bind_param($stmt, $params_types, ...$params); // unpack
    mysqli_stmt_execute($stmt);

    if ( 'SELE' == $query_type || '(SEL' == $query_type ) {
      $result = mysqli_stmt_result_metadata($stmt);
      list($columns, $columns_vars) = array(array(), array());
      while ( $field = mysqli_fetch_field($result) ) {
        $columns[] = $field->name;
        $columns_vars[] = &${'column_' . $field->name};
      }
      call_user_func_array('mysqli_stmt_bind_result', array_merge(array($stmt), $columns_vars));
      $return_array = array();
      while ( mysqli_stmt_fetch($stmt) ) {
        $row = array();
        foreach ( $columns as $col ) {
          $row[$col] = ${'column_' . $col};
        }
        $return_array[] = $row;
      }

      return $return_array;
    } // end query_type SELECT

    else if ( 'INSE' == $query_type ) {
      return mysqli_insert_id($dbconn);
    }
    return 1;
  }
}

Mysqli - 将结果绑定到数组

5 个答案: