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  Java look and feel mode (Facade mode)
  Add Date : 2018-11-21      
  Facade Definition: Provides a consistent interface to a set of interfaces in a subsystem.

Facade A typical application is the application of the database JDBC, as the following example of the database operation:

Public class DBCompare {
Connection conn = null;
PreparedStatement prep = null;
ResultSet rset = null;
Try {
Class.forName ( "< driver>") .newInstance ();
Conn = DriverManager.getConnection ( "< database>");
In this case,
String sql = "SELECT * FROM < table> WHERE < column name> =?";
Prep = conn.prepareStatement (sql);
Prep.setString (1, "< column value>");
Rset = prep.executeQuery ();
If (rset.next ()) {
System.out.println (rset.getString ( "< column name"));
} Catch (SException e) {
E.printStackTrace ();
} Finally {
Rset.close ();
Prep.close ();
Conn.close ();

Jsp example is the most common way of operating the database.

In the application, often need to operate on the database, each time to write a code above is certainly too much trouble, which need to extract the same part of them, made into an interface, which introduces the appearance of facade objects. If we later replace the Class.forName in the < driver> is also very convenient, such as from the Mysql database for Oracle database, as long as the interface can replace the facade driver.

We made a Facade interface, the use of the interface, the procedures in the above example can be changed as follows:

Public class DBCompare {
String sql = "SELECT * FROM < table> WHERE < column name> =?";
Try {
Mysql msql = new mysql (sql);
Prep.setString (1, "< column value>");
Rset = prep.executeQuery ();
If (rset.next ()) {
System.out.println (rset.getString ( "< column name"));
} Catch (SException e) {
E.printStackTrace ();
} Finally {
Mysql.close ();
Mysql = null;

Visible is very simple, all procedures for database access are used to change the interface, reducing the complexity of the system, an increase of flexibility.

If we want to use the connection pool, as long as the facade interface can be modified.

Facade is actually a system to straighten out the relationship between the system to reduce the coupling between the degree of a common approach, perhaps you have unwittingly in use, although do not know it is facade.
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