BindEqualDirective


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19  
20  package org.apache.cayenne.access.jdbc;
21  
22  import java.io.IOException  ;
23  import java.io.Writer  ;
24  
25  import org.apache.velocity.context.InternalContextAdapter;
26  
27  /**
28   * A custom Velocity directive to create a PreparedStatement parameter text
29   * for "= ?". If null value is encountered, generated text will look like "IS NULL".
30   * Usage in Velocity template is "WHERE SOME_COLUMN #bindEqual($xyz)".
31   * 
32   * @since 1.1
33   * @author Andrus Adamchik
34   */
35  public class BindEqualDirective extends BindDirective {
36  
37      public String   getName() {
38          return "bindEqual";
39      }
40  
41      protected void render(
42          InternalContextAdapter context,
43          Writer   writer,
44          ParameterBinding binding)
45          throws IOException   {
46  
47          if (binding.getValue() != null) {
48              bind(context, binding);
49              writer.write("= ?");
50          }
51          else {
52              writer.write("IS NULL");
53          }
54      }
55  }
56
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