specification/imports/Column.txt

@Target({ElementType.FIELD, ElementType.METHOD}) 
@Retention(RetentionPolicy.RUNTIME)
public @interface Column
{
    /**
     * Name of the column.
     * @return the name of the column
     */
    String name() default "";

    /**
     * Target column for this column in the other table when part of a 
     * foreign key relation.
     * @return the target column in the other table for this column 
     * when part of a foreign key relation.
     */
    String target() default "";

    /**
     * Target member in the other class or interface for this column 
     * when part of a bidirectional relation.
     * @return the target member for this column when part of 
     * a bidirectional relation.
     */
    String targetMember() default "";

    /**
     * JDBC Type for this column.
     * @return JDBC type for this column
     */
    String jdbcType() default "";

    /**
     * SQL Type for this column.
     * @return SQL type for this column
     */
    String sqlType() default "";

    /**
     * Maximum length of data stored in this column.
     * @return the maximum length of data stored in this column
     */
    int length() default -1;

    /**
     * Scale for the column when handling floating point values.
     * @return the scale for the column when handling floating point values
     */
    int scale() default -1;

    /**
     * Whether the column allows null values to be inserted.
     * @return whether the column allows null values to be inserted
     */
    String allowsNull() default "";

    /**
     * Default value for this column.
     * @return the default value for this column
     */
    String defaultValue() default "";

    /**
     * Value to be inserted when this is an "unmapped" column
     * @return the value to be inserted when this is an "unmapped" column
     */
    String insertValue() default "";

    /** Vendor extensions.
     * @return the vendor extensions
     */
    Extension[] extensions() default {};
}