所以我在使用 PDO 执行执行查询时遇到问题。我不断从服务器返回的错误是我有一个数组到字符串的转换。然后它告诉我在 execute(array())
代码行中输入的参数数量无效。我还在错误代码中得到一个 1
缓冲区,这意味着可能存在一些错误的串联。
该功能是一个搜索页面,用户可以在其中输入最多 6 个参数来搜索书籍。有 6 个 if 语句用于检查是否为空,如果不为空,则该变量将添加到数组 params
中,并且是连接到开始语句末尾的 SQL 查询的一部分。这是相关代码:
$title = $_POST['title'];
$author = $_POST['author'];
$publisher = $_POST['publisher'];
$isbn = $_POST['isbn'];
$condition = $_POST['condition'];
$status = $_POST['status'];
//array to hold variables
$params = array();
$concat_stmt_orig = "SELECT * FROM Book WHERE ";
$concat_stmt = "SELECT * FROM Book WHERE ";
//Check for Title
if(!empty($title)){
//add title to the end
$concat_stmt = $concat_stmt." `Title` = ?";
//add variable to print list
array_push($params, $title);
}
//Check for Author
if(!empty($author)){
if(strlen($concat_stmt) !== strlen($concat_stmt_orig)){
//add author to the end
$concat_stmt = $concat_stmt." AND `Author1` = ?";
//add variable to print list
array_push($params, $author);
}
else{
//add author to the end
$concat_stmt = $concat_stmt." `Author1` = ?";
//add variable to print list
array_push($params, $author);
}
}
//Check for publisher
if(!empty($publisher)){
if(strlen($concat_stmt) !== strlen($concat_stmt_orig)){
//add publisher to the end
$concat_stmt = $concat_stmt." AND `Publisher` = ?";
//add variable to print list
array_push($params, $publisher);
}
else{
//add pubisher to the end
$concat_stmt = $concat_stmt." `Publisher` = ?";
//add publisher to print list
array_push($params, $publisher);
}
}
//check for ISBN
if(!empty($isbn)){
if(strlen($concat_stmt) !== strlen($concat_stmt_orig)){
//add isbn to the end
$concat_stmt = $concat_stmt." AND `ISBN` = ?";
//add variable to print list
array_push($params, $isbn);
}
else{
//add pubisher to the end
$concat_stmt = $concat_stmt." `ISBN` = ?";
//add publisher to print list
array_push($params, $isbn);
}
}
//check for condition
if(!empty($condition)){
if(strlen($concat_stmt) !== strlen($concat_stmt_orig)){
//add condition to the end
$concat_stmt = $concat_stmt." AND `BookCondition` = ?";
//add condition to print list
array_push($params, $condition);
}
else{
//add condition to the end
$concat_stmt = $concat_stmt." `BookCondition` = ?";
//add condition to print list
array_push($params, $condition);
}
}
//check for status
if(!empty($status)){
if(strlen($concat_stmt) !== strlen($concat_stmt_orig)){
//add status to the end
$concat_stmt = $concat_stmt." AND `Status` = ?";
//add variable to print list
array_push($params, $status);
}
else{
//add condition to the end
$concat_stmt = $concat_stmt." `Status` = ?";
//add condition to print list
array_push($params, $status);
}
}
//prepare statement for querying
$stmt_retrieve = $db->prepare($concat_stmt);
echo print_r($stmt_retrieve);
var_dump($params);
//exectue query
$stmt_retrieve->execute(array($params));
}
echo 和 var dump 用于测试目的,以检查 sql 语句和数组值的正确数量
这里是错误
PDOStatement Object ( [queryString] => SELECT * FROM Book WHERE
Title
= ? ANDAuthor1
= ? ) 1array(2) { [0]=> string(13) "Example Title" [1]=> string(14) "Example Author" } Notice: Array to string conversion in...."yadayadayada"Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens'...."yadayadayada"
我尝试输入帖子值作为“$title”,“$author”...等,但仍然产生错误,我也尝试过 printf 和其他。
只有当我尝试输入多个变量进行搜索时,才会出现这些错误。当我只按一个变量搜索时,程序没有错误,但仍然不会返回任何内容。
感谢任何帮助或指导:)
最佳答案
使用$stmt_retrieve->execute($params);
目前,您拥有相当于:
$stmt_retrieve->execute(array(array('title','author1',....)));
看到那里的双数组
了吗?
@tadman 是对的,您当前的代码有大量代码重复,很快就会变得无法维护。
这样的事情会有所帮助:
$fields = array(
'Title' => $_POST['title'],
'Author1' => $_POST['author'],
....);
$params = array();
$wheres = array();
foreach($fields as $fieldname => $value){
if(!empty($value)){
$wheres[] = "`$fieldname` = ?";
$params[] = $value;
}
}
$stmt = 'SELECT * FROM Book';
if(!empty($wheres)) $stmt .= ' WHERE '.implode(' AND ',$wheres);
$stmt_retrieve = $db->prepare($stmt);
$stmt_retrieve->execute($params);
关于php - 数组到字符串转换错误/PDO 在数组中执行数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27133477/