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## org.apache.cayenne.access.jdbc
Class ResultDirective

    java.lang.Object
      org.apache.velocity.runtime.directive.Directive
          org.apache.cayenne.access.jdbc.ResultDirective

All Implemented Interfaces:
  java.lang.Cloneable, org.apache.velocity.runtime.directive.DirectiveConstants

    public class ResultDirective

extends org.apache.velocity.runtime.directive.Directive

A custom Velocity directive to describe a ResultSet column. There are the following possible invocation formats inside the template:

     #result(column_name) - e.g. #result('ARTIST_ID')
     #result(column_name java_type) - e.g. #result('ARTIST_ID' 'String')
     #result(column_name java_type column_alias) - e.g. #result('ARTIST_ID' 'String' 'ID')
     #result(column_name java_type column_alias data_row_key) - e.g. #result('ARTIST_ID' 'String' 'ID' 'toArtist.ID')

'data_row_key' is needed if SQL 'column_alias' is not appropriate as a DataRow key on the Cayenne side. One common case when this happens is when a DataRow retrieved from a query is mapped using joint prefetch keys. In this case DataRow must use DB_PATH expressions for joint column keys, and their format is incompatible with most databases alias format.

Most common Java types used in JDBC can be specified without a package. This includes all numeric types, primitives, String, SQL dates, BigDecimal and BigInteger.

Since:
  1.1
Author:
  Andrei Adamchik

Field Summary

Fields inherited from class org.apache.velocity.runtime.directive.Directive
`rsvc`

Fields inherited from interface org.apache.velocity.runtime.directive.DirectiveConstants
`BLOCK, LINE`

Constructor Summary
`ResultDirective()`

Method Summary
`protected void` | `bindResult(org.apache.velocity.context.InternalContextAdapter context, ColumnDescriptor columnDescriptor)` Adds value to the list of result columns in the context.
`protected java.lang.Object` | `getChild(org.apache.velocity.context.InternalContextAdapter context, org.apache.velocity.runtime.parser.node.Node node, int i)`
`protected java.lang.String` | `getChildAsString(org.apache.velocity.context.InternalContextAdapter context, org.apache.velocity.runtime.parser.node.Node node, int i)` Returns a directive argument at a given index converted to String.
`java.lang.String` | `getName()`
`int` | `getType()`
`protected java.lang.String` | `guessType(java.lang.String type)` Converts "short" type notation to the fully qualified class name.
`boolean` | `render(org.apache.velocity.context.InternalContextAdapter context, java.io.Writer writer, org.apache.velocity.runtime.parser.node.Node node)`

Methods inherited from class org.apache.velocity.runtime.directive.Directive
`getColumn, getLine, init, setLocation`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ResultDirective

    public ResultDirective()

Method Detail

### getName

    public java.lang.String getName()

  Specified by:
    `getName` in class `org.apache.velocity.runtime.directive.Directive`

### getType

    public int getType()

  Specified by:
    `getType` in class `org.apache.velocity.runtime.directive.Directive`

### render

    public boolean render(org.apache.velocity.context.InternalContextAdapter context,
                          java.io.Writer writer,
                          org.apache.velocity.runtime.parser.node.Node node)
                   throws java.io.IOException,
                          org.apache.velocity.exception.ResourceNotFoundException,
                          org.apache.velocity.exception.ParseErrorException,
                          org.apache.velocity.exception.MethodInvocationException

  Specified by:
    `render` in class `org.apache.velocity.runtime.directive.Directive`
  Throws:
    `java.io.IOException`
    `org.apache.velocity.exception.ResourceNotFoundException`
    `org.apache.velocity.exception.ParseErrorException`
    `org.apache.velocity.exception.MethodInvocationException`

### getChild

    protected java.lang.Object getChild(org.apache.velocity.context.InternalContextAdapter context,
                                        org.apache.velocity.runtime.parser.node.Node node,
                                        int i)
                                 throws org.apache.velocity.exception.MethodInvocationException

  Throws:
    `org.apache.velocity.exception.MethodInvocationException`

### getChildAsString

    protected java.lang.String getChildAsString(org.apache.velocity.context.InternalContextAdapter context,
                                                org.apache.velocity.runtime.parser.node.Node node,
                                                int i)
                                         throws org.apache.velocity.exception.MethodInvocationException

  Returns a directive argument at a given index converted to String.

  Throws:
    `org.apache.velocity.exception.MethodInvocationException`
  Since:
    1.2

### guessType

    protected java.lang.String guessType(java.lang.String type)

  Converts "short" type notation to the fully qualified class name. Right now supports all major standard SQL types, including primitives. All other types are expected to be fully qualified, and are not converted.

### bindResult

    protected void bindResult(org.apache.velocity.context.InternalContextAdapter context,
                              ColumnDescriptor columnDescriptor)

  Adds value to the list of result columns in the context.

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