通过Hibernate的Criteria生成SQL

CriteriaJoinWalker 类：将Criteria中的projection和criterion打包成sql
CriteriaQueryTranslator类：封装实体类属性获取列名，获取查询参数（封装在该类中CriteriaQueryTranslator）值或类型等工具方法
CriteriaImpl 类：封装操作（projection和criterion）及实体信息
实现代码如下：

private String criteriaTranformSql(Criteria criteria)
{

    CriteriaImpl criteriaImpl = (CriteriaImpl) criteria;//转型  
    SessionImplementor session = criteriaImpl.getSession();//获取SESSION  
    SessionFactoryImplementor factory = session.getFactory();//获取FACTORY  
    CriteriaQueryTranslator translator = new CriteriaQueryTranslator(factory, criteriaImpl, criteriaImpl  
        .getEntityOrClassName(), CriteriaQueryTranslator.ROOT_SQL_ALIAS);  
    String[] implementors = factory.getImplementors(criteriaImpl.getEntityOrClassName());  
    CriteriaJoinWalker walker = new CriteriaJoinWalker((OuterJoinLoadable) factory  
        .getEntityPersister(implementors[0]), translator, factory, criteriaImpl, criteriaImpl  
        .getEntityOrClassName(), session.getLoadQueryInfluencers());  
    String sql = walker.getSQLString();  //转化成sql语句

    //使用参数替换sql中参数占位符？
    //获取参数值
    Object[] parameters = translator.getQueryParameters().getPositionalParameterValues();
    if (sql != null)
    {
        if (parameters != null && parameters.length > 0)
        {
            for (Object val : parameters)
            {
                String value = "%";
                if (val instanceof Boolean)
                {
                    value = ((Boolean) val) ? "1" : "0";
                }
                else if (val instanceof String)
                {
                    value = "'" + val + "'";
                }
                else if (val instanceof Number)
                {
                    value = val.toString();
                }
                else if (val instanceof Class)
                {
                    value = "'" + ((Class) val).getCanonicalName() + "'";
                }
                else if (val instanceof Date)
                {
                    SimpleDateFormat sdf = new SimpleDateFormat(
                        "yyyy-MM-dd HH:mm:ss.SSS");
                    value = "'" + sdf.format((Date) val) + "'";
                }
                else if (val instanceof Enum)
                {
                    value = "" + ((Enum) val).ordinal();
                }
                else
                {
                    value = val.toString();
                }
                sql = sql.replaceFirst("\\?", value);
            }
        }
    }
    return sql.replaceAll("left outer join", "\nleft outer join").replaceAll(
        " and ", "\nand ").replaceAll(" on ", "\non ").replaceAll("<>",
        "!=").replaceAll("<", " < ").replaceAll(">", " > ");
}