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

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

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

Direct Known Subclasses:
  BindEqualDirective, BindNotEqualDirective, BindObjectEqualDirective

    public class BindDirective

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

A custom Velocity directive to create a PreparedStatement parameter text. There are the following possible invocation formats inside the template:

     #bind(value) - e.g. #bind($xyz)
     #bind(value jdbc_type_name) - e.g. #bind($xyz 'VARCHAR'). This is the most common and useful form.
     #bind(value jdbc_type_name, scale) - e.g. #bind($xyz 'VARCHAR' 2)

Other examples:

Binding literal parameter value:

`"WHERE SOME_COLUMN > #bind($xyz)"` produces `"WHERE SOME_COLUMN > ?"` and also places the value of the "xyz" parameter in the context "bindings" collection.

Binding ID column of a DataObject value:

`"WHERE ID_COL1 = #bind($helper.cayenneExp($xyz, 'db:ID_COL2')) AND ID_COL2 = #bind($helper.cayenneExp($xyz, 'db:ID_COL2'))"` produces `"WHERE ID_COL1 = ? AND ID_COL2 = ?"` and also places the values of id columns of the DataObject parameter "xyz" in the context "bindings" collection.

Since:
  1.1

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
`BindDirective()`

Method Summary
`protected void` | `bind(org.apache.velocity.context.InternalContextAdapter context, ParameterBinding binding)` Adds value to the list of bindings in the context.
`protected Object` | `getChild(org.apache.velocity.context.InternalContextAdapter context, org.apache.velocity.runtime.parser.node.Node node, int i)`
`String` | `getName()`
`int` | `getType()`
`boolean` | `render(org.apache.velocity.context.InternalContextAdapter context, Writer writer, org.apache.velocity.runtime.parser.node.Node node)` Extracts the value of the object property to render and passes control to `render(InternalContextAdapter, Writer, ParameterBinding)` to do the actual rendering.
`protected void` | `render(org.apache.velocity.context.InternalContextAdapter context, Writer writer, org.apache.velocity.runtime.parser.node.Node node, Object value, String typeString, int scale)`
`protected void` | `render(org.apache.velocity.context.InternalContextAdapter context, Writer writer, ParameterBinding binding)`

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

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

Constructor Detail

### BindDirective

    public BindDirective()

Method Detail

### getName

    public 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,
                          Writer writer,
                          org.apache.velocity.runtime.parser.node.Node node)
                   throws IOException,
                          org.apache.velocity.exception.ResourceNotFoundException,
                          org.apache.velocity.exception.ParseErrorException,
                          org.apache.velocity.exception.MethodInvocationException

  Extracts the value of the object property to render and passes control to `render(InternalContextAdapter, Writer, ParameterBinding)` to do the actual rendering.

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

### render

    protected void render(org.apache.velocity.context.InternalContextAdapter context,
                          Writer writer,
                          org.apache.velocity.runtime.parser.node.Node node,
                          Object value,
                          String typeString,
                          int scale)
                   throws IOException,
                          org.apache.velocity.exception.ParseErrorException

  Throws:
    `IOException`
    `org.apache.velocity.exception.ParseErrorException`
  Since:
    3.0

### render

    protected void render(org.apache.velocity.context.InternalContextAdapter context,
                          Writer writer,
                          ParameterBinding binding)
                   throws IOException

  Throws:
    `IOException`

### getChild

    protected 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`

### bind

    protected void bind(org.apache.velocity.context.InternalContextAdapter context,
                        ParameterBinding binding)

  Adds value to the list of bindings in the context.

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