src/main/java/com/itfsw/mybatis/generator/plugins/utils/XmlElementGeneratorTools.java
public static XmlElement generateKeysSelective(List<IntrospectedColumn> columns, String prefix, boolean bracket) {
        return generateCommColumnsSelective(columns, prefix, bracket, 1);
    }
public static XmlElement generateKeysSelective(List<IntrospectedColumn> columns, String prefix, boolean bracket) {
        return generateCommColumnsSelective(columns, prefix, bracket, 1);
    }
生成keys Selective Ele
@param columns
@param prefix
@param bracket
@return