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To bind a parameter by index, we use the appropriate setXXX() method depending on the data type of the input variable being bound. Here the index refers to the ordinal position of the value in the query string. For example, consider the SQL statement select empno, ename, job from emp where empno = and hiredate < " In the preceding statement, the first literal value has to be replaced by an integer representing the employee number, so we will use the setInt() method of the PreparedStatement interface: public void setInt(int parameterIndex, int x) throws SQLException; Similarly, the second literal value is a date, so we use the setDate() method to bind it with a date value: public void setDate(int parameterIndex, java.sql.Date date ) throws SQLException Next, we ll look at how to bind parameters by name.

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The code in UndoChangesComplete() sets the _bindingEdit flag, reestablishes the object s validation rules, and raises the PropertyChanged event for all properties on the object thus ensuring that data binding is aware that the object s state has changed The ValidationRules class will be implemented later in the chapter, but it manages a list of business rules for each property It also maintains a list of currently broken business rules The list of broken business rules is part of the object s state and is subject to n-level undo The list of rules associated with each property is really a list of delegate references, which can be broken by serialization To prevent any such issues, that list isn t subject to serialization or n-level undo Instead, after resetting the object s state with UndoChanges(), the business rules are simply reassociated with the properties by calling the AddBusinessRules() method.

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Binding Parameters by Name (Oracle 10g Only)

The SetTarget() method is also called to ensure that ValidationRules has a current reference to the business object This will be much clearer later in the chapter as you look at the ValidationRules and BrokenRulesCollection classes..

Before any object definition or code you create or modify can kick in, it needs to be compiled. You can do this explicitly using the Compile menu option on most object types pop-up menus. In the case of code, it happens automatically when you save it. What is really important for you as an application developer is that the compiler reports errors, warnings, and best-practice deviations in your code when it tries to compile it. When you compile, a Compiler Output window resembling what you see in Figure 18-19 is displayed.

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An alternative to using as a placeholder for our bind variables is to bind by parameter name. This is an Oracle 10g-specific feature that improves the readability of the prepared statement string. To use named parameters, we have to use the appropriate setXXXAtName() method of the OraclePreparedStatement interface. For example, if we want to bind the query discussed in the previous section by name, we would first use the following query string while preparing the statement: select empno, ename, job from emp where empno = :empno and hiredate < :hiredate"

The System.ComponentModel.IEditableObject interface is used by the Windows Forms data binding infrastructure to control undo operations in two cases: First, if an object is a child of a collection and is being edited in a grid control, the IEditableObject interface will be used so that the user can start editing a row of the grid (that is, the object) and then press Esc to undo any edits he s made on the row. Second, when binding controls from a Windows Form to an object s properties, the IEditableObject interface will be used to tell the object that editing has started. It will not be used to tell the object when editing is complete or if the user requests an undo. It s up to the UI code to handle these cases. When using data binding to bind an object to a form, you can allow the data binding infrastructure to tell the object that editing has started. I typically don t rely on that feature, preferring

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