src/main/java/com/itfsw/mybatis/generator/plugins/utils/XmlElementGeneratorTools.java
public static List<Element> generateKeys(List<IntrospectedColumn> columns, boolean bracket) {
        return generateCommColumns(columns, null, bracket, 1);
    }
public static List<Element> generateKeys(List<IntrospectedColumn> columns, boolean bracket) {
        return generateCommColumns(columns, null, bracket, 1);
    }
生成keys Ele
@param columns
@param bracket
@return