pgsql 42601 PDO :: execute错误 [英] pgsql 42601 error with PDO::execute

问题描述

我在$ pdo-> execute($ values)上遇到问题.

I have problems with $pdo->execute($values).

如果我使用不带$ values的$pdo->execute()，效果很好:

It works fine if I use $pdo->execute() without $values:

$dsn = sprintf('%s:host=%s;port=%s;dbname=%s', DB_TYPE, DB_HOST, DB_PORT, DB_NAME);
$pdo = new PDO($dsn, DB_USER, DB_PASS, array());
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = 'SELECT * FROM "user" ORDER BY id DESC LIMIT 50 OFFSET 0';
$stmt = $pdo->prepare(trim($sql));
$stmt->setFetchMode(PDO::FETCH_OBJ|PDO::FETCH_PROPS_LATE);
$stmt->execute();

echo "<pre>";
print_r($stmt->fetchAll());
echo "</pre>";

它工作正常，但是当我要添加值替换时:

It works fine, but when I want to add values replacement:

$dsn = sprintf('%s:host=%s;port=%s;dbname=%s', DB_TYPE, DB_HOST, DB_PORT, DB_NAME);
$pdo = new PDO($dsn, DB_USER, DB_PASS, array());
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = 'SELECT * FROM "user" ORDER BY ? ? LIMIT 50 OFFSET 0';
$values = array('id','DESC');

$stmt = $pdo->prepare(trim($sql));
$stmt->setFetchMode(PDO::FETCH_OBJ|PDO::FETCH_PROPS_LATE);
$stmt->execute($values);

echo "<pre>";
print_r($stmt->fetchAll());
echo "</pre>";

它不起作用.它返回:

SQLSTATE [42601]:语法错误:7错误:"$ 2"或附近的语法错误 第1行:SELECT * FROM"user"，按$ 1 $ 2 LIMIT 50 OFFSET 0 ^'in ...

SQLSTATE[42601]: Syntax error: 7 ERROR: syntax error at or near "$2" LINE 1: SELECT * FROM "user" ORDER BY $1 $2 LIMIT 50 OFFSET 0 ^' in ...

推荐答案

如果order by子句中有多个列，则ORDER BY期望以逗号分隔的列列表

ORDER BY expects a comma-separated list of columns if there's more than one column in the order by clause

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