APEX Bad Practices
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We all make mistakes. Making mistakes is an opportunity to learn. But as a first step you have to recognize the mistakes you made. If you don't, those mistakes might evolve into a practice. A bad practice. But you can also learn from someone else's mistakes. That's why I crowdsourced "Bad Practices" that people have encountered in the wild. And I was suprised by the numerous examples people came up with. So this session will cover real world examples of practices that are labeled as "bad". Of course we will discuss why these practices are bad and what would be the better solution.
![function render
( p_dynamic_action in apex_plugin.t_dynamic_action
, p_plugin in apex_plugin.t_plugin
)
return apex_plugin.t_dynamic_action_render_result
is
l_result apex_plugin.t_dynamic_action_render_result;
begin
l_result.javascript_function :=
'function(){
openModal( this.affectedElements[0].id );
}';
return l_result;
end;](https://image.slidesharecdn.com/apexbadpractices-200403081400/85/APEX-Bad-Practices-81-320.jpg)
![function render
( p_dynamic_action in apex_plugin.t_dynamic_action
, p_plugin in apex_plugin.t_plugin
)
return apex_plugin.t_dynamic_action_render_result
is
l_result apex_plugin.t_dynamic_action_render_result;
begin
l_result.javascript_function :=
'function(){
openModal( this.affectedElements[0].id );
}';
return l_result;
end;](https://image.slidesharecdn.com/apexbadpractices-200403081400/85/APEX-Bad-Practices-83-320.jpg)
![function render
( p_dynamic_action in apex_plugin.t_dynamic_action
, p_plugin in apex_plugin.t_plugin
)
return apex_plugin.t_dynamic_action_render_result
is
l_result apex_plugin.t_dynamic_action_render_result;
begin
l_result.javascript_function :=
'function({
apex.theme.openRegion( this.affectedElements[0].id );
}';
return l_result;
end;](https://image.slidesharecdn.com/apexbadpractices-200403081400/85/APEX-Bad-Practices-84-320.jpg)
![function render
( p_dynamic_action in apex_plugin.t_dynamic_action
, p_plugin in apex_plugin.t_plugin
)
return apex_plugin.t_dynamic_action_render_result
is
l_result apex_plugin.t_dynamic_action_render_result;
begin
l_result.javascript_function :=
'function(){
var myGrid = apex.region( this.affectedElements[0].id )
.widget().interactiveGrid("getViews").grid;
myGrid.model.fetchRecords( myGrid.getSelectedRecords() );
}';
return l_result;
end;](https://image.slidesharecdn.com/apexbadpractices-200403081400/85/APEX-Bad-Practices-94-320.jpg)
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APEX Bad Practices
- 1. Copyright © 2019 APEX Consulting APEX Bad Practices
- 3. <bragging>
- 5. </bragging>
- 6. 3 Membership Tiers • Oracle ACE Director • Oracle ACE • Oracle ACE Associate bit.ly/OracleACEProgram 500+ Technical Experts Helping Peers Globally Connect: Nominate yourself or someone you know: acenomination.oracle.com @oracleace Facebook.com/oracleaces [email protected]
- 10. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 11. Get organised
- 12. Naming stuff
- 17. Need a Page Item Value on other pages? Use an Application Item Use P0_EMPNO Use P1_EMPNO
- 22. A few Applications with a lot of Pages
- 23. A lot of Applications with a few Pages
- 24. MASTER SEED subscription APP 1 APP 2 APP 3 copy subscription subscription subscription
- 26. Page 0
- 27. Unsubscribe
- 30. Don’t put your files in the APEX directories
- 35. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 36. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 37. Dude, where’s my code?
- 39. Process Region / Item Source Condition Read Only Condition Item Default Dynamic Action Validation Where CAN you put your PL/SQL?
- 40. Where SHOULD you put your PL/SQL? Reusable Testable Compiled Dependencies
- 41. Some more remarks regarding PL/SQL
- 43. select * from my_big_table where field = v('P2_EMPNO')
- 44. select * from my_big_table where field = ( select v('P2_EMPNO') from dual )
- 45. with param as ( select v('P2_EMPNO') empno from dual ) select * from my_big_table , param where field = param.empno
- 46. with param as ( select /*+ MATERIALIZE */ v('P2_EMPNO') empno from dual ) select * from my_big_table , param where field = param.empno
- 49. FORMAT MASK
- 51. render / submit / ajax
- 58. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 59. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 62. Page “JavaScript section” Page header / footer Region header / footer Item Pre / Post Text URL target Dynamic Action When / Condition DA Action : Execute JavaScript Code Where CAN you put your JavaScript?
- 63. Where SHOULD you put your JavaScript? In a file (on your network / static app file) (reference in the User Interface Details) In a Plugin (JavaScript file) Roels Rule : No JavaScript anywhere else
- 64. The code is more what you'd call "guidelines" than actual rules
- 65. How should you code your JavaScript? $(“#P1_EMPNO”) or apex.item(“P1_EMPNO”)
- 68. How should you code your JavaScript? $v(“#P1_EMPNO”) or apex.item(“P1_EMPNO”).getValue()
- 69. How should you code your JavaScript? $v(“P1_EMPNO”) or apex.item(“P1_EMPNO”).getValue()
- 72. Know your APEX JavaScript API’s https://docs.oracle.com/en/database/oracle/application-express/19.1/aexjs/index.html
- 73. Beware of undocumented features
- 74. gReport
- 75. htmldb_Get
- 76. A lot of stuff in the Interactive Grid
- 77. Watch your plugins …
- 78. Beware of undocumented features
- 79. Beware of DOCUMENTED features
- 81. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function(){ openModal( this.affectedElements[0].id ); }'; return l_result; end;
- 83. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function(){ openModal( this.affectedElements[0].id ); }'; return l_result; end;
- 84. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function({ apex.theme.openRegion( this.affectedElements[0].id ); }'; return l_result; end;
- 86. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 87. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 88. Miscellaneous
- 89. Dynamic Actions are cool
- 91. Page Process / Computation
- 93. Region refresh Page refresh Row refresh
- 94. function render ( p_dynamic_action in apex_plugin.t_dynamic_action , p_plugin in apex_plugin.t_plugin ) return apex_plugin.t_dynamic_action_render_result is l_result apex_plugin.t_dynamic_action_render_result; begin l_result.javascript_function := 'function(){ var myGrid = apex.region( this.affectedElements[0].id ) .widget().interactiveGrid("getViews").grid; myGrid.model.fetchRecords( myGrid.getSelectedRecords() ); }'; return l_result; end;
- 95. Get organised Dude, where’s my code? And what about JavaScript … Miscellaneous
- 97. Copyright © 2019 APEX Consulting Q& A@roelh [email protected] http://www.apexconsulting.nl