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Implementation of mysql form submission in php development to prevent repeated refreshing

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The following describes how to implement mysql form submission in php development to prevent repeated refreshes. If you have encountered similar problems before, take a look.

The database is jokes and the table is jokes. Add a joke as an example.
Mysql form submission page:

 
 
    
  
  
  1. <HTML>
    2. 
  
  
  2. <HEAD>
    3. 
  
  
  3. <TITLE> Our List of Jokes </TITLE>
    4. 
  
  
  4. </HEAD>
    5. 
  
  
  5. <BODY>
    6. 
  
  
  6.  
    7. 
  
  
  7. <? Php
    8. 
  
  
  8. Session_start (); // enable session
    9. 
  
  
  9. $ Timetime = time ();
    10. 
  
  
  10. $ Key = "sess _". $ time; // generate a random session key based on the time
    11. 
  
  
  11. $ _ SESSION [$ key] = $ time; // sets the session value.
    12. 
  
  
  12. ?>
    13. 
  
  
  13.  
    14. 
  
  
  14. <Form action = "input. php? Tjid = 1 "METHOD = POST>
    15. 
  
  
  15. <P> Type your joke here: <BR>
    16. 
  
  
  16. <Textarea name = "joketext" ROWS = 10 COLS = 40 WRAP> </TEXTAREA> <BR>
    17. 
  
  
  17. // Pass the session key to the server for processing by hiding the form
    18. 
  
  
  18. <Input type = "hidden" name = "session_key" value = "<? Php echo $ key;?> "/>
    19. 
  
  
  19. <Input type = submit name = "submitjoke" VALUE = "SUBMIT">
    20. 
  
  
  20. </FORM>
    21. 
  
  
  21.  
    22. 
  
  
  22. </BODY>
    23. 
  
  
  23. </HTML>
    24. 
  
  
  24.  
    25. 
  
  
  25. Processing page:
    26. 
  
  
  26. <HTML>
    27. 
  
  
  27. <HEAD>
    28. 
  
  
  28. <TITLE> Our List of Jokes </TITLE>
    29. 
  
  
  29. </HEAD>
    30. 
  
  
  30. <BODY>
    31. 
  
  
  31. // Connect to the database:
    32. 
  
  
  32. <? Php
    33. 
  
  
  33. $ Dbcnx = mysql_connect ("localhost", "root ","******");
    34. 
  
  
  34. If (! $ Dbcnx ){
    35. 
  
  
  35. Echo ("<P> Unable to connect to ".
    36. 
  
  
  36. "Database server at this time. </P> ");
    37. 
  
  
  37. Exit ();
    38. 
  
  
  38. }
    39. 
  
  
  39. // Select the jokes database
    40. 
  
  
  40. If (! @ Mysql_select_db ("jokes ")){
    41. 
  
  
  41. Echo ("<P> Unable to locate the joke ".
    42. 
  
  
  42. "Database at this time. </P> ");
    43. 
  
  
  43. Exit ();
    44. 
  
  
  44. }
    45. 
  
  
  45. // Start the session:
    46. 
  
  
  46. Session_start ();
    47. 
  
  
  47. $ Key = $ _ POST ['session _ key'];
    48. 
  
  
  48. If (! $ Key | $ _ SESSION [$ key]! = Substr ($ key, 5 )){
    49. 
  
  
  49. // If the session_key parameter is not passed
    50. 
  
  
  50. // Or the number after the session_key parameter value truncates sess _ does not match the session parameter value
    51. 
  
  
  51. Unset ($ _ SESSION [$ key]); // deletes the session value.
    52. 
  
  
  52. Echo "chu cuo la"; // then consider whether an error is prompted, or transfer to another page
    53. 
  
  
  53. Exit (); // terminate page Code Execution
    54. 
  
  
  54. }
    55. 
  
  
  55.  
    56. 
  
  
  56. // Write the data below
    57. 
  
  
  57. If ("SUBMIT" ==$ _ POST ["submitjoke"]) {
    58. 
  
  
  58. $ SQL = "INSERT INTO Jokes (joketext)
    59. 
  
  
  59. VALUES ('$ _ POST [joketext]')
    60. 
  
  
  60. ";
    61. 
  
  
  61. If (mysql_query ($ SQL )){
    62. 
  
  
  62. Echo ("<P> Your joke has been added. </P> ");
    63. 
  
  
  63. } Else {
    64. 
  
  
  64. Echo ("<P> Error adding submitted joke :".
    65. 
  
  
  65. Mysql_error (). "</P> ");
    66. 
  
  
  66. }
    67. 
  
  
  67. // After the data operation is complete, delete the session
    68. 
  
  
  68. Unset ($ _ SESSION [$ key]);
    69. 
  
  
  69. }
    70. 
  
  
  70. ?>
    71. 
  
  
  71.  
    72. 
  
  
  72. // Display joke content:
    73. 
  
  
  73. <P> Here are all the jokes in our database: </P>
    74. 
  
  
  74. <BLOCKQUOTE>
    75. 
  
  
  75. <? Php
    76. 
  
  
  76. $ Result = mysql_query (
    77. 
  
  
  77. "SELECT * FROM Jokes ");
    78. 
  
  
  78. If (! $ Result ){
    79. 
  
  
  79. Echo ("<P> Error checking Ming query :".
    80. 
  
  
  80. Mysql_error (). "</P> ");
    81. 
  
  
  81. Exit ();
    82. 
  
  
  82. }
    83. 
  
  
  83. // Display the text of each joke in a paragraph
    84. 
  
  
  84. While ($ row = mysql_fetch_array ($ result )){
    85. 
  
  
  85. Echo ("<P>". $ row ["JokeText"]. "</P> ");
    86. 
  
  
  86. }
    87. 
  
  
  87. ?>
    88. 
  
  
  88.  
    89. 
  
  
  89. </BODY>
    90. 
  
  
  90. </HTML>
    91. 
  
  
  91.  
    92.

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