BindNotEqualDirective


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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 for "<>?".
29   * If null value is encountered, generated text will look like "IS NOT NULL". Usage in
30   * Velocity template is "WHERE SOME_COLUMN #bindNotEqual($xyz)".
31   * 
32   * @since 1.1
33   * @author Andrus Adamchik
34   */
35  public class BindNotEqualDirective extends BindDirective {
36  
37      public String   getName() {
38          return "bindNotEqual";
39      }
40  
41      protected void render(
42              InternalContextAdapter context,
43              Writer   writer,
44              ParameterBinding binding) throws IOException   {
45  
46          if (binding.getValue() != null) {
47              bind(context, binding);
48              writer.write("<> ?");
49          }
50          else {
51              writer.write("IS NOT NULL");
52          }
53      }
54  }
55
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