Cách kiểm tra truy vấn trong PHP

Giá trị trả về. Đối với CHỌN, HIỂN THỊ, MÔ TẢ hoặc GIẢI THÍCH, nó trả về một đối tượng mysqli_result. Đối với các truy vấn thành công khác, nó trả về true. Mặt khác, nó trả về false khi thất bại

Hãy hiểu cách chúng ta có thể thực thi một truy vấn SQL

Thực hiện một truy vấn SQL. Chúng tôi sẽ hiểu cách chúng tôi có thể thực hiện một truy vấn SQL với một ví dụ. Chúng tôi sẽ tạo một cơ sở dữ liệu, bảng và sau đó chèn một số giá trị vào đó

Thí dụ. Tạo cơ sở dữ liệu và chèn một số giá trị vào đó

PHP

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74

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New record created successfully

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24

Table has been created successfully

710

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711

New record created successfully

2

Table has been created successfully

713

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72

Table has been created successfully

715

New record created successfully

0

Table has been created successfully

72

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718

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74

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New record created successfully

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726

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728

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730

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739

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711

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742

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715

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2

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747

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748

đầu ra

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9

Tạo bảng

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766

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768

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76

New record created successfully

0

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72

New record created successfully

2

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74

New record created successfully

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New record created successfully

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Table has been created successfully

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New record created successfully

7

Table has been created successfully

1

New record created successfully

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New record created successfully

7

Table has been created successfully

766

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21

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New record created successfully

2

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Table has been created successfully

710

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0

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718

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đầu ra

Table has been created successfully

Chèn một số giá trị vào bảng “Emp”

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766

Table has been created successfully

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Table has been created successfully

768

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76

New record created successfully

0

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72

New record created successfully

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New record created successfully

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Table has been created successfully

710

Table has been created successfully

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New record created successfully

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New record created successfully

2

Table has been created successfully

726

Table has been created successfully

718

Table has been created successfully

728

Table has been created successfully

27

Table has been created successfully

730

New record created successfully

37

Table has been created successfully

76

Table has been created successfully

72

Table has been created successfully

715

Table has been created successfully

735

Table has been created successfully

736

Table has been created successfully

27

Table has been created successfully

730

New record created successfully

45

Table has been created successfully

711

Table has been created successfully

718

Table has been created successfully

711

New record created successfully

49

Table has been created successfully

711

New record created successfully

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Table has been created successfully

742

Table has been created successfully

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Table has been created successfully

715

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New record created successfully

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747

Table has been created successfully

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đầu ra

New record created successfully

Ghi chú. Vì chúng tôi đã sử dụng AUTO_INCREMENT, nên nó sẽ tự động chèn bản ghi có “id=1” và với mỗi bản ghi mới được chèn, nó sẽ tăng “id” lên một

Lấy kết quả từ cơ sở dữ liệu

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

766

Table has been created successfully

74

Table has been created successfully

768

Table has been created successfully

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New record created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

74

New record created successfully

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New record created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

766

Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

710

Table has been created successfully

711

New record created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

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Table has been created successfully

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Table has been created successfully

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New record created successfully

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Table has been created successfully

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Truy vấn [] trả về gì trong PHP?

Làm cách nào để kiểm tra kết quả truy vấn trống trong PHP?

Làm thế nào các truy vấn SQL được chạy trong PHP?

mysqli_query[] dùng để làm gì?