Question

我正在尝试创建一个名为update的函数来更新信息。但是我已经搞砸了插入数据的更新查询语句部分。它没有返回任何东西。数据库表名=“test_table”。这是我桌上的照片，

enter image description here

function update( $con, $tbl_name, $colName, $colValue, $whereWhat, $equalsThis) {

    if( count($colName) > 0 && count($colValue) > 0 ) {
        if( count($colName) === count($colValue) ) {
            if( mb_strlen($tbl_name) > 0 ) {
                if( mb_strlen($whereWhat) > 0 ) {
                    if( mb_strlen($equalsThis) > 0){

                        for( $i = 0; $i < count($colName); $i++ ) {
                            if( mb_strlen($colName[$i]) > 0 && mb_strlen($colValue[$i]) > 0 && strpos($colName[$i], "=") !== false && strpos($colName[$i], "?") !== false ) {
                                $colName[$i]  = trim($colName[$i]);
                                $colValue[$i] = trim($colValue[$i]);
                            } else {
                                return "Doesn't contain = or wrong length";
                            }
                        }

                        $query = sprintf("UPDATE %s SET %s WHERE %s = %s",
                                 trim($tbl_name),
                                 array_values($colName),
                                 trim($whereWhat),
                                 trim($equalsThis)
                        );

                        $q = $con->prepare($query);
                        $q->execute(array_values($colValue) );

                        return "Worksz";

                    } else {
                        return "equalsThis identifier Required "; 
                    }
                } else {
                    return "whereWhat identifier Required "; 
                }
            } else {
                return "Table name required";
            }           
        } else {
            return "Require Same Arr len";
        }
    } else {
        return "wrong arr";
    }
}// end of function update();

这会调用该函数。格式应如下所述！

//UPDATE test_table SET col1 = ?, col2 = ? WHERE col2 = 1b;
echo update( $con, "test_table", array("col1 = ?,", "col2 = ?"), array("col1Val", "colVal2"), "col2", "1b");

$ where什么是列名称的行指示符。 $ equalsThis是列的值。

Answer 1

我认为你想要做的事情会更好地使用一个类与错误处理函数结合起来（希望你对类有点熟悉，但如果你愿意，你可以摆弄这个）：< / p>

<?php
    // This function purely returns errors
    function error_handler($error = false) {
            switch($error) {
                    case ('001'):
                        return "No values exist";
                    case ('002'):
                        return "Table name required";
                    case ('003'):
                        return "Where values required";
                }
        }

    // This engine does the sql assembly/execution and can be expanded on.
    class QueryEngine
        {
            public      $error;
            public      $statement;

            protected   $con;
            protected   $sql;

            public  function __construct($con = false)
                {
                    // It is presumed you are using an object connection
                    if(!is_object($con))
                        die("Invalid database connection.");
                    // Assign connection variable
                    $this->con  =   $con;
                }

            public  function update($table = false)
                {
                    $this->error    =   false;
                    $table          =   trim(preg_replace('/[^a-zA-Z0-9\_\-\.]/',"",$table));
                    $this->sql      =   array();

                    if($table == false || empty($table)) {
                            $this->error['table']   =   error_handler('002');
                            return $this;
                        }

                    $this->sql[]    =   "update";
                    $this->sql[]    =   "`$table`";

                    return $this;
                }

            public  function set($array = false)
                {
                    if(!is_array($array) || (is_array($array) && empty($array))) {
                            $this->error['values']  =   error_handler('001');
                            return $this;
                        }

                    $this->sql[]    =   "set";

                    foreach($array as $key => $value) {
                            $this->bind[":".$key]   =   $value;
                            $setvals[]              =   "`$key` = :$key";
                        }

                    if(isset($setvals))
                            $this->sql[]    =   implode(", ",$setvals);

                    return $this;
                }

            public  function where($array = false, $oper = "and", $comp = "=")
                {
                    if(!is_array($array) || (is_array($array) && empty($array))) {
                            $this->error['values']  =   error_handler('003');
                            return $this;
                        }

                    if(!in_array("where",$this->sql))
                        $this->sql[]    =   "where";

                    $i = 0;
                    foreach($array as $key => $value) {

                            $this->bind[":where".$i]    =   $value;
                            $whereset[]                 =   "`$key` ".$comp." :where".$i;
                            $i++;
                        }

                    if(isset($whereset))
                        $this->sql[]    =   trim(implode($oper." ",$whereset));

                    return $this;
                }

            public  function Combine()
                {
                    $this->statement    =   implode(" ",$this->sql);
                    return $this;
                }

            public  function write()
                {
                    $this->Combine();

                    if($this->error == false) {
                            $query      =   $this->con->prepare($this->statement);
                            $query->execute($this->bind);
                        }

                    return $this;
                }
        }

使用：

// Create a new instance. $con is your PDO connection (obviously)
$engine =   new QueryEngine($con);
// Assign the bulk of the method chain to $query. You could chain it all together
// but this way you can do quick error check before trying the sql execute`
$query  =   $engine ->update("test_table")
                    ->set(array("col1"=>"value1","col2"=>"value2"))
                    ->where(array("col1"=>"value3"));

// If the error variable is still false, try inserting into database
if($query->error == false) {
        // This is just a direct access to the final query statement
        //echo $query->Combine()->statement;
        // Will try and write to database
        $query->write();
    }
// If there is an error, show the error.
// The errors can be expanded out.
else
    print_r($query->error);
?>

成功的SQL程序集：

// SQL statement
update `test_table` set `col1` = :col1, `col2` = :col2 where `col1` = :where0
// Bind array
Array
(
    [:col1] => value1
    [:col2] => value2
    [:where0] => value3
)

执行失败（缺少信息）：

Array
(
    [table] => Table name required
)

PHP PDO函数更新值插入错误

1 个答案: