Dalam kueri di mysql php

Question

Jika Anda ingin menggunakan PHP untuk menanyakan database MySQL Anda, Anda dapat melakukannya dengan memasukkan perintah kueri MySQL dalam skrip PHP atau mendefinisikan perintah sebagai variabel dan menggunakan variabel saat diperlukan

Table of Contents Show

Penjelasan Kode (Procedural style)
Apa itu %s dan %D di MySQL?
Bagaimana cara menjalankan kueri MySQL di PHP?
Apa yang ada di operator di MySQL?

Tutorial ini menjelaskan cara melakukan kueri dengan menggunakan variabel. Dalam hal ini, perintah akan terlihat mirip dengan

mysqli_query($query);

Perintah dapat diulangi lagi di kode sumber. Yang perlu Anda lakukan hanyalah mengubah variabel $query

Sebagai contoh, berikut adalah kode lengkap yang bisa digunakan untuk membuat tabel MySQL di PHP

query("$query");
$mysqli->close();
?>

_

Ganti your_username, your_password dan your_database dengan nilai sebenarnya di tiga baris pertama skrip

Anda dapat mengganti nilai variabel $query dengan kueri MySQL apa pun yang Anda inginkan dan Anda dapat menggunakan format di atas untuk menjalankannya

Sejauh ini Anda telah mempelajari cara membuat database dan tabel serta memasukkan data. Sekarang saatnya mengambil data yang telah disisipkan pada tutorial sebelumnya. Pernyataan SQL SELECT_ digunakan untuk memilih record dari tabel database. Sintaks dasarnya adalah sebagai berikut

PILIH nama_kolom1, nama_kolom2, nama_kolom DARI nama_tabel;

Mari kita membuat kueri SQL menggunakan pernyataan SELECT, setelah itu kita akan mengeksekusi kueri SQL ini dengan meneruskannya ke fungsi PHP mysqli_query() untuk mengambil data tabel

Pertimbangkan tabel database orang kami memiliki catatan berikut

+----+------------+-----------+----------------------+
| id | first_name | last_name | email                |
+----+------------+-----------+----------------------+
|  1 | Peter      | Parker    | [email protected] |
|  2 | John       | Rambo     | [email protected]   |
|  3 | Clark      | Kent      | [email protected]   |
|  4 | John       | Carter    | [email protected]  |
|  5 | Harry      | Potter    | [email protected] |
+----+------------+-----------+----------------------+

Kode PHP dalam contoh berikut memilih semua data yang disimpan dalam tabel orang (menggunakan karakter asterisk (*) di tempat nama kolom memilih semua data dalam tabel)

Contoh

PDO Berorientasi Objek Prosedural

Unduh

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

connect_error);
}
 
// Attempt select query execution
$sql = "SELECT * FROM persons";
if($result = $mysqli->query($sql)){
    if($result->num_rows > 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = $result->fetch_array()){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        $result->free();
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . $mysqli->error;
}
 
// Close connection
$mysqli->close();
?>

setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e){
    die("ERROR: Could not connect. " . $e->getMessage());
}
 
// Attempt select query execution
try{
    $sql = "SELECT * FROM persons";   
    $result = $pdo->query($sql);
    if($result->rowCount() > 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = $result->fetch()){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        unset($result);
    } else{
        echo "No records matching your query were found.";
    }
} catch(PDOException $e){
    die("ERROR: Could not able to execute $sql. " . $e->getMessage());
}
 
// Close connection
unset($pdo);
?>

Penjelasan Kode (Procedural style)

Pada contoh di atas, data yang dikembalikan oleh fungsi mysqli_query() disimpan dalam variabel $result. Setiap kali

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

_0 dipanggil, ia mengembalikan baris berikutnya dari hasil yang ditetapkan sebagai larik. While loop digunakan untuk mengulang semua baris di set hasil. Terakhir, nilai bidang individual dapat diakses dari baris baik dengan meneruskan indeks bidang atau nama bidang ke variabel

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

1 seperti

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

2 atau

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

3,

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

4 atau

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

5,

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

6 atau

 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = mysqli_fetch_array($result)){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
 
// Close connection
mysqli_close($link);
?>

7, dan ________3______8 atau ________3

Jika Anda ingin menggunakan loop

connect_error);
}
 
// Attempt select query execution
$sql = "SELECT * FROM persons";
if($result = $mysqli->query($sql)){
    if($result->num_rows > 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = $result->fetch_array()){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        $result->free();
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . $mysqli->error;
}
 
// Close connection
$mysqli->close();
?>

_0 Anda bisa mendapatkan nilai penghitung loop atau jumlah baris yang dikembalikan oleh kueri dengan meneruskan variabel $result ke fungsi

connect_error);
}
 
// Attempt select query execution
$sql = "SELECT * FROM persons";
if($result = $mysqli->query($sql)){
    if($result->num_rows > 0){
        echo "";
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        while($row = $result->fetch_array()){
            echo "";
                echo "";
                echo "";
                echo "";
                echo "";
            echo "";
        }
        echo "idfirst_namelast_nameemail" . $row['id'] . "" . $row['first_name'] . "" . $row['last_name'] . "" . $row['email'] . "";
        // Free result set
        $result->free();
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . $mysqli->error;
}
 
// Close connection
$mysqli->close();
?>

2. Nilai penghitung loop ini menentukan berapa kali loop harus dijalankan

Apa itu %s dan %D di MySQL?

%d – argumen diperlakukan sebagai bilangan bulat, dan disajikan sebagai angka desimal (bertanda tangan). %s – argumen diperlakukan sebagai dan disajikan sebagai string . dalam contoh Anda, $slug adalah string dan $this->id adalah bilangan bulat.

Bagaimana cara menjalankan kueri MySQL di PHP?

Cara Menjalankan Query MySQL di PHP .

Buat Basis Data. // Buat basis data. .

Sisipkan Data. $sql = "MASUKKAN KE PENGGUNA (nama depan, nama belakang, email).

Dapatkan ID Rekaman yang Dimasukkan Terakhir. .

Pilih Data. .

Hapus Data. .

Perbaharui data. .

Batasi Pilihan Data

Apa yang ada di operator di MySQL?

Operator MySQL IN . Operator IN adalah singkatan untuk beberapa kondisi OR. allows you to specify multiple values in a WHERE clause. The IN operator is a shorthand for multiple OR conditions.

Apa '?'

Pernyataan yang disiapkan menggunakan '?' . Sangat dianggap lebih aman terhadap injeksi SQL jika digunakan dengan benar. Ini juga memungkinkan kueri SQL lebih cepat karena permintaan hanya perlu dikompilasi sekali dan dapat digunakan kembali

kode php