带整数值的多次准备语句不能执行 [英] Prepared statement cannot be executed multiple times with integer values

问题描述

如何使用不同的整数值正确地重新执行已准备好的语句?

How do I properly re-execute a prepared statement using different integer values?

在重用ODBC准备语句时，显式和隐式绑定PDO::PARAM_INT出现致命错误.

There's something deathly wrong with explicit and implicit binding PDO::PARAM_INT when reusing an ODBC prepared statement.

CREATE TABLE mytab (
    col INT,
    something VARCHAR(20)
);

Works:多个字符串

$pdoDB = new PDO('odbc:Driver=ODBC Driver 13 for SQL Server;
  Server='.DATABASE_SERVER.';
  Database='.DATABASE_NAME,
  DATABASE_USERNAME,
  DATABASE_PASSWORD
);
$pdoDB->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

$values = ['here','are','some','values'];
$sql = "INSERT INTO mytab (something) VALUES (:something)";
$stmt = $pdoDB->prepare($sql);
foreach ($values as $value)
  $stmt->execute(['something'=>$value]);

Works:单个整数

$values = [42];
$sql = "INSERT INTO mytab (col) VALUES (:col)";
$stmt = $pdoDB->prepare($sql);
foreach ($values as $value)
  $stmt->execute(['col'=>$value]);

不起作用:多个整数

$values = [1,3,5,7,11];
$sql = "INSERT INTO mytab (col) VALUES (:col)";
$stmt = $pdoDB->prepare($sql);
foreach ($values as $value)
  $stmt->execute(['col'=>$value]);

它实际上成功地插入了第一条记录1，但是当它尝试在下一次执行时重用该语句时失败了.

It actually successfully inserts the first record 1 but fails when it tries to reuse the statement on the next execute.

PHP致命错误:未捕获的PDOException:SQLSTATE [22018]:转换规范的字符值无效:206 [Microsoft] [用于SQL Server的ODBC驱动程序13] [SQL Server]操作冲突:文本与int不兼容(SQLExecute [ 206]，位于/build/php7.0-lPMnpS/php7.0-7.0.8/ext/pdo_odbc/odbc_stmt.c:260)

PHP Fatal error: Uncaught PDOException: SQLSTATE[22018]: Invalid character value for cast specification: 206 [Microsoft][ODBC Driver 13 for SQL Server][SQL Server]Operand type clash: text is incompatible with int (SQLExecute[206] at /build/php7.0-lPMnpS/php7.0-7.0.8/ext/pdo_odbc/odbc_stmt.c:260)

我正在使用用于SQLServer®的Microsoft®ODBC驱动程序13(预览)

我尝试将整个内容包装在 PDO::beginTransaction 和 PDO::commit

I have tried wrapping the whole thing in PDO::beginTransaction and PDO::commit

我也尝试使用 PDOStatement::bindParam ，但是它抛出了完全一样的错误.

I've also tried using PDOStatement::bindParam but it throws the exact same error.

$values = [1];
$sql = "INSERT INTO mytab (col) VALUES (:col)";
$stmt = $pdoDB->prepare($sql);
foreach ($values as $value){
  $stmt->bindParam('col', $value, PDO::PARAM_INT);
  $stmt->execute();
}

不起作用

$values = [1,2];
$sql = "INSERT INTO mytab (col) VALUES (:col)";
$stmt = $pdoDB->prepare($sql);
foreach ($values as $value){
  $stmt->bindParam('col', $value, PDO::PARAM_INT);
  $stmt->execute();
}

我认为我注意到与使用PHP 5.6.9的此未回答的问题完全相同的错误非常有趣. .但是，他们甚至不能执行一条语句，所以我想知道是否存在部分补丁，因为抛出错误的确切行已经从

I think it's interesting to note that I am getting the exact same error as this unanswered question using PHP 5.6.9. However, they are not able to execute even one statement, so I'm wondering if there's been a partial patch considering the exact line throwing the error has moved from odbc_stmt.c:254 to odbc_stmt.c:260

如果我在循环内准备 语句，那么就可以了.但是我读到这效率很低，我应该可以重用陈述.我特别担心将其与海量数据集一起使用.这个可以吗?我能做些更好的事情吗?

If I prepare the statement inside the loop, then it works just fine. But I've read that this is very inefficient and I should be able to reuse the statement. I'm particularly worried about using this with massive datasets. Is this OK? Is there something better that I can do?

$values = [1,3,5,7,9,11];
$sql = "INSERT INTO mytab (col) VALUES (:col)";
foreach ($values as $value){
  $stmt = $pdoDB->prepare($sql);
  $stmt->execute(['col'=>$value]);
}

推荐答案

对于准备好的语句，通常必须在循环外使用bindParam.

In case of prepared statements you have to use bindParam outside of loop, usually.

1. bindParam是一个步骤
2. 设置绑定变量是可重复的步骤(循环)
3. 每次重复都必须运行execute

1. bindParam is a single step
2. setting bound variables is a repeatable step (loop)
3. you have to run execute for each repetition

我想，类似的方法会起作用:

I guess, something like that would work:

$stmt = $pdoDB->prepare("INSERT INTO mytab (col, key) VALUES (:col, :key)");

// bind params (by reference)
$stmt->bindParams(":col", $col, PDO::PARAM_STR); //bind variable $col
$stmt->bindParams(":key", $key, PDO::PARAM_INT); //bind variable $key

$values = ['here','are','some','values'];
foreach ($values as $i => $value) {
    $col = $value; //set col
    $key = $i; //set key
    $stmt->execute();
}

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