friend,come!

[river]

Sorry,I'm useing a traditional Chinese system,so I write my question in Engish.
First,I really thank a friend named billie for his answer,however I still can't solve my question.The help text for TField.CustomConstraint says a
sentence x>0 and x<10 ,I don't understand what the 'x' refer to and how to use the property in program. Who can tell me? By the way,I'm interested in programming and using Delphi now.You can contact me.
E-mail:[e-mail]
icq:69920630

[Lin]

CustomConstraint属性是一个合法的SQL条件表达式，用来限制该Field的取值范围。这里的x是一个泛指，并非特指某个变量或者表达式。在设置该属性时，最好再设置CpnstraintErrorMessage，当用户输入越界时用来提示用户。