add comment to columnName

Author: yukihane

src/main/java/org/apache/ibatis/type/BaseTypeHandler.java

@@ -104,6 +104,9 @@ public T getResult(CallableStatement cs, int columnIndex) throws SQLException {
 
   public abstract void setNonNullParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException;
 
+  /**
+   * @param columnName Colunm name, when configuration <code>useColumnLabel</code> is <code>false</code>
+   */
   public abstract T getNullableResult(ResultSet rs, String columnName) throws SQLException;
 
   public abstract T getNullableResult(ResultSet rs, int columnIndex) throws SQLException;

src/main/java/org/apache/ibatis/type/TypeHandler.java

@@ -27,6 +27,9 @@ public interface TypeHandler<T> {
 
   void setParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException;
 
+  /**
+   * @param columnName Colunm name, when configuration <code>useColumnLabel</code> is <code>false</code>
+   */
   T getResult(ResultSet rs, String columnName) throws SQLException;
 
   T getResult(ResultSet rs, int columnIndex) throws SQLException;