Learning a Little SQL in Java

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5 Learning a Little SQL
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Remember that not what you know isn t what s important but how you visualize. To know is to memorize how to do a specific thing, but if you visualize, you gain an understanding of behavior patterns, and from these patterns, you can not only interpolate and extrapolate a tremendous amount of practical knowledge, but you can also learn specific techniques faster as well.
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C H A P T E R
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Using ColdFusion Forms
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oldFusion forms extend normal HTML forms by adding a clientside validation framework that is easy to implement. No faster way is available to develop intelligent forms for your ColdFusion application.
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In This
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Validating data on both the client and the server Using CFINPUT Using HTML form controls Using graphical user interface controls
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Implementing Client-Side Validation
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One of the biggest oversights that ColdFusion developers make is not to validate data before it leaves the form. If you are expecting the user to enter a date, make sure that he enters a date. If a value can t be left blank, make sure that the user enters a value before submitting the form. Thankfully, ColdFusion s built-in client-side validation is easy to implement.
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CrossReference This section is an introduction to using client-side validation with CFFORM. For more in-depth coverage, see 20 of this book, which also covers other forms of data validation with ColdFusion.
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By simply using CFFORM in place of the normal HTML FORM tag, you tell ColdFusion to create the entire validation framework for you. Then, by using ColdFusion form control tags in place of normal HTML form control tags, you tell ColdFusion to use that framework. Take, for example, the following code:
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<cfform action= dummy.cfm method= POST name= testForm > Nickname:  <cfinput type= Text name= Nickname message= You must enter your Extreme Snowboarding nickname. required= Yes size= 40 maxlength= 40 ><br> Age:  <cfinput type= Text name= Age range= 7,70 message= Bummer, dude! Your age makes you ineligible for Extreme Snowboarding! validate= integer
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Part I Getting Started with ColdFusion MX
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required= Yes size= 12 maxlength= 4 ><br> <input type= submit > </cfform>
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This code produces the following output in your browser (although we took some liberties with tabs and returns to collapse the height but the code itself is unchanged):
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<SCRIPT LANGUAGE= JavaScript TYPE= text/javascript SRC= /CFIDE/scripts/cfform.js ></SCRIPT> <SCRIPT LANGUAGE= JavaScript TYPE= text/javascript > <!-function _CF_checktestForm(_CF_this) { if (!_CF_hasValue(_CF_this.Nickname, TEXT )) { if (!_CF_onError(_CF_this, _CF_this.Nickname, _CF_this.Nickname.value, You must enter your Extreme Snowboarding nickname. )) { return false; } } if (!_CF_hasValue(_CF_this.Age, TEXT )) { if (!_CF_onError(_CF_this, _CF_this.Age, _CF_this.Age.value, Bummer, dude! Your age makes you ineligible for Extreme Snowboarding! )) { return false; } } if ((!_CF_checkrange(_CF_this.Age.value, 7, 70))) { if (!_CF_onError(_CF_this, _CF_this.Age, _CF_this.Age.value, Bummer, dude! Your age makes you ineligible for Extreme Snowboarding! )) { return false; } } if (!_CF_checkinteger(_CF_this.Age.value)) { if (!_CF_onError(_CF_this, _CF_this.Age, _CF_this.Age.value, Bummer, dude! Your age makes you ineligible for Extreme Snowboarding! )) { return false; } } return true; } //--> </SCRIPT> <FORM NAME= testForm ACTION= dummy.cfm METHOD= POST onSubmit= return _CF_checktestForm(this) > Nickname:  <INPUT TYPE= Text NAME= Nickname SIZE= 40 MAXLENGTH= 40 ><br> Age:  <INPUT TYPE= Text NAME= Age SIZE= 12 MAXLENGTH= 4 ><br>
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6 Using ColdFusion Forms
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<input type= submit > </FORM>
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After this form is submitted, the JavaScript function _CF_checktestForm() is called before anything else can happen. Each ColdFusion form control is tested according to its validation attributes. The Age field, for example, is tested to determine whether it contains a value, whether that value is an integer, and whether that integer is between 7 and 70. If any of these tests fail, the validation message Bummer, dude! Your age makes you ineligible for Extreme Snowboarding! appears in a JavaScript alert box via the _CF_onError() function inside the external JavaScript file cfform.js, and the form is not submitted. If all form data passes the validation tests, the form is submitted to its action template.
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Caution Client-side validation like this will not work if the user turns off JavaScript in his browser.
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