我正在尝试使用预处理语句创建一个PDO数据库类，但我似乎已经把自己卡在了select函数中。我已经尝试过各种各样的东西，但它总会最终给我错误。我也非常抱歉，我并没有真正意义上的错误。
当前错误：
注意：数组转换为字符串 第136行的D：\ wamp64 \ www \ PDOtest \ databaseClassTest.php
注意：数组 在D：\ wamp64 \ www \ PDOtest \ databaseClassTest.php上进行字符串转换 第137行致命错误：在布尔值中调用成员函数fetchAll（） 第166行的D：\ wamp64 \ www \ PDOtest \ databaseClassTest.php
<?php
class database {
private $handler;
public function __construct($databaseType,$host,$dbname,$username,$password) {
$this->handler = new PDO("{$databaseType}:host={$host};dbname={$dbname}", $username, $password);
}
public function insert($table, $collumsArrayAndValues) {
$sql = "INSERT INTO {$table} ("; // Make the first part of the Insert query with the table and (. example "INTERT INTO post (";
$countColums = count($collumsArrayAndValues);//make a variable to hold the amount of colums which the user provides with the array.
/*
if the array is
array(
':message' => $message,
':user_ID' => $user_ID,
':board_ID' => $board_ID
)
this would return 3 because it has 3 elements
*/
$i = 0; //initialize an iterator
foreach($collumsArrayAndValues as $colum => $value) { // cut the colums array into parts and loop threw them
$i++; // add one to the iterator
if($i < $countColums){ //if the Iterator is smallen then the amount of colums
$sql .= $colum . ", "; // add the colum name to the sql string and add a ,
// i do this because when you have multipe colums you need an , to differentiate the colums
} else {
$sql .= $colum . ")";// the last ellement should not have an ,!!!!!!!!!!!!!!!!!!! it should also have an ) at the end of the colum declartion
}
}
$sql .= " VALUES ("; // add the values clause...
$i = 0; // reset the iterator
foreach($collumsArrayAndValues as $colum => $value) { // cut the colums array into parts and loop threw them
$i++; // add one to the iterator
if($i < $countColums){ //if the Iterator is smallen then the amount of colums
$sql .= ":{$colum}, "; // add the prepared name to the sql string and add a ,
// i do this because when you have multipe prepared names you need an , to differentiate the colums
} else {
$sql .= ":{$colum})"; /// the last element should not have an ,......
}
}
$query = $this->handler->prepare($sql); //prepare the statement
$ar = array(); //initialize an array
foreach($collumsArrayAndValues as $colum => $value) { // cut the colums array into parts and loop threw them
$ar[":{$colum}"]= $value; // make the link...
}
$query->execute($ar);// execute the query
}
public function select($fieldAndTableArray, $where = NULL) {
$sql = "SELECT ";
$fieldAndTableArray;
$countTabels = count($fieldAndTableArray);//make a variable to hold the amount of colums which the user provides with the array.
/*
if the array is
array(
"tabel" => array("colum1a", "colum2a", "colum3a", "colum4a"),
"tabel2" => array("colum1b", "colum2b", "colum3b", "colum4b")
)
this would return 2 because it has 2 elements
*/
foreach($fieldAndTableArray as $table => $fields){ // cut the colums array into parts and loop threw them
$countFields = count($fields);//make a variable to hold the amount of colums which the user provides with the array.
$i =0;
foreach($fields as $field) {
$i++;
$sql .= "`{$table}`.`{$field}`";
if($i <= $countFields) {
$sql .= ", ";
}
}
}
$sql .= " FROM ";
$i = 0;
foreach($fieldAndTableArray as $table => $fields){ // cut the colums array into parts and loop threw them
$i++;
$sql .= "`{$table}`";
if($i < $countTabels) {
$sql .=", ";
}
}
if($where != NULL) {
$sql .= " WHERE ";
if(is_array($where)) {
foreach($where as $wherePart) {
if(is_array($wherePart)) {
$elementCounter = 0;
foreach($wherePart as $element){
$elementCounter++;
if($elementCounter >= 3){
$sql .= ":{$element}";
} else {
$sql .= $element . " ";
}
}
} else {
$sql .= $wherePart . " ";
}
}
} else {
$sql .= $where;
}
}
if(is_array($where)) {
$ar = array(); //initialize an array
foreach($where as $wherePart=>$value) {
if(is_array($wherePart)) {
$elementCounter = 0;
foreach($wherePart as $element){
$elementCounter++;
if($elementCounter >= 3){
$ar[":{$colum}"]= $value; // make the link...
}
}
}
}
}
$query = $this->handler->prepare($sql); //prepare the statement
foreach($where as $colum => $value) { // cut the colums array into parts and loop threw them
$ar[":{$colum}"]= $value; // make the link...
}
$query->execute($ar);// execute the query
return $query->execute($ar);// execute the query
}
}
$db = new database("mysql", "127.0.0.1", "imageboard", "root", "");
//$db->insert("post", array("message"=>"Hello i am a message from PDO", "user_ID"=>(int)1, "board_ID"=>(int)2));
/*var_dump($db->select(
array(
"tabel" => array("colum1a", "colum2a", "colum3a", "colum4a"),
"tabel2" => array("colum1b", "colum2b", "colum3b", "colum4b")
),
array(
array("colum1a", "=", "banaan"), "AND",
array("colum1b", "!=", "24")
)
));*/
echo "deze werkt goed->";
$result = $db->select(
array(
"post" => array("post_ID", "post_name", "image_ID", "message"),
"image" => array("image_path")
),
array(
array("`post`.`image_ID`", "=", "`image`.`image_ID`")
)
);
var_dump($result);
while($row = $result->fetchAll())
{
echo $row['message'].'<br>';
}
?>
答案 0 :(得分：0)
我花了一些时间查看代码并想出了这个 `
protected function __construct() {
try {
$this->db = new PDO('mysql:host=' . Config::get('mysql/host') . ';dbname=' . Config::get('mysql/database'), Config::get('mysql/username'), Config::get('mysql/password'));
} catch(PDOException $e) {
die($e->getMessage());
}
}
public static function getInstance() {
if(!isset(self::$handler)) { //if there is no instance jet we want to make an instance one would also use this to excute things methods inside this this class
self::$handler = new Database();
}
return self::$handler; //return the instance
}
public function insert($table, $collumsArrayAndValues) {
$sql = "INSERT INTO `{$table}` ("; // Make the first part of the Insert query with the table and (. example "INTERT INTO post (";
$countColums = count($collumsArrayAndValues);//make a variable to hold the amount of colums which the user provides with the array.
/*
if the array is
array(
':message' => $message,
':user_ID' => $user_ID,
':board_ID' => $board_ID
)
this would return 3 because it has 3 elements
*/
$i = 0; //initialize an iterator
foreach($collumsArrayAndValues as $colum => $value) { // cut the colums array into parts and loop threw them
$i++; // add one to the iterator
if($i < $countColums){ //if the Iterator is smallen then the amount of colums
$sql .= "`{$colum}`, "; // add the colum name to the sql string and add a ,
// i do this because when you have multipe colums you need an , to differentiate the colums
} else {
$sql .= "`{$colum}`)";// the last ellement should not have an ,!!!!!!!!!!!!!!!!!!! it should also have an ) at the end of the colum declartion
}
}
$sql .= " VALUES ("; // add the values clause...
$i = 0; // reset the iterator
foreach($collumsArrayAndValues as $colum => $value) { // cut the colums array into parts and loop threw them
$i++; // add one to the iterator
if($i < $countColums){ //if the Iterator is smallen then the amount of colums
$sql .= "?, "; // add the prepared name to the sql string and add a ,
// i do this because when you have multipe prepared names you need an , to differentiate the colums
} else {
$sql .= "?)"; /// the last element should not have an ,......
}
}
$ar = array(); //initialize an array
foreach($collumsArrayAndValues as $colum => $value) { // cut the colums array into parts and loop threw them
$ar[]= $this->replaceQuotesAndBackslashes($value); // make the link...
}
if($this->action($sql, $ar)) {
return $this->db->lastInsertId();
} else {
return NULL;
}
}
public function select($fieldAndTableArray, $where = NULL) {
$sql = "SELECT ";
$fieldAndTableArray;
$countTabels = count($fieldAndTableArray);//make a variable to hold the amount of colums which the user provides with the array.
/*
if the array is
array(
"tabel" => array("colum1a", "colum2a", "colum3a", "colum4a"),
"tabel2" => array("colum1b", "colum2b", "colum3b", "colum4b")
)
this would return 2 because it has 2 elements
*/
foreach($fieldAndTableArray as $table => $fields){ // cut the colums array into parts and loop threw them
$countFields = count($fields);//make a variable to hold the amount of colums which the user provides with the array.
$i =0;
foreach($fields as $field) {
$i++;
$sql .= "`{$table}`.`{$field}`";
if($i <= $countFields) {
$sql .= ", ";
}
}
}
$sql = substr($sql, 0, -2);
$sql .= " FROM ";
$i = 0;
foreach($fieldAndTableArray as $table => $fields){ // cut the colums array into parts and loop threw them
$i++;
$sql .= "`{$table}`";
if($i < $countTabels) {
$sql .=", ";
}
}
if($where != NULL) {
$sql .= " WHERE ";
foreach($where as $wherePart) {
if(is_array($wherePart)) {
$elementCounter = 0;
foreach($wherePart as $element){
$elementCounter++;
if($elementCounter >= 3){
$sql .= "?";
} else {
$sql .= $element . " ";
}
}
} else {
$sql .= " " . $wherePart . " ";
}
}
$ar = array(); //initialize an array
foreach($where as $wherePart) {
$elementCounter++;
if(is_array($wherePart)){
$elementCounter = 0;
foreach($wherePart as $value) {
$elementCounter++;
if($elementCounter == 3){
$ar[] = $this->replaceQuotesAndBackslashes($value);
}
}
}
}
}
// $this->query($query, $ar);
return $this->query($sql, $ar);
}
public function query($sql, $params) {
$query = $this->db->prepare($sql); //prepare the statement
$query->execute($params);// execute the query
return $query;
}
public function action($sql, $params) {
$query = $this->db->prepare($sql); //prepare the statement
return $query->execute($params);// execute the query
}
private function replaceQuotesAndBackslashes($fieldValue){
// $fieldValue = mysqli_real_escape_string($conn, $fieldValue);
$fieldValue = str_replace("\\", "\\\\", $fieldValue);
$fieldValue = str_replace("'", '\\\'', $fieldValue);
return $fieldValue;
}
}
/* EXAMPLES AND TESTING
Database::getInstance()->insert(
"tabelname", array(
"collum1" => $value1,
"collum2" => $value1
));
$result = Database::getInstance()->select(
array(
"post" => array("post_ID", "post_name", "image_ID", "message"),
"image" => array("image_path")
),
array(
array("`post`.`image_ID`", "=", "1"), "AND",
array("`post`.`post_ID`", "!=", "34567")
)
);
while ($row = $result->fetch()) {
echo"<pre>", print_r($row), "<pre />";
}
/*$sth = $db->prepare('SELECT message, post_name
FROM post
WHERE post_name < ?');
$sth->execute(array('red'));
$red = $sth->fetchAll();*/
/*
119470ef20ab9907b293fb36e5200b7c
Kevin Neven 2016 5-6 23:34*/
`