Java HashMap中的绑定空值

我正在制作一个参数输入表单来查询审计表。不需要输入

下面的SQL查询是我希望Java解析的查询，它可以完美地工作。它根据输入返回我想要的行

SELECT *
FROM _audit
WHERE DATEDIFF(NOW(), `_audit_timestamp`) < 30
      AND (('smith' <> '' AND _action__user = 'smith')
           OR (_action__user = _action__user AND 'smith' IS NULL))
      AND ((NULL IS NOT NULL AND _action_searchkey IS NULL)
           OR (_action_searchkey = _action_searchkey OR _action_searchkey IS NULL))
      AND ((NULL IS NOT NULL AND _action_customer IS NULL)
           OR (_action_customer = _action_customer AND _action_customer IS NULL))
ORDER BY _audit_timestamp DESC

选择*
来自审计部
其中DATEDIFF（NOW（），`u audit\u timestamp`）小于30
和（（'smith''和_action__用户='smith'）
或（\u action\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
和（（NULL不为NULL，并且_action_searchkey为NULL）
或（_action_searchkey=_action_searchkey或_action_searchkey为空））
和（（NULL不为NULL，并且_action_customer为NULL）
或（_action_customer=_action_customer和_action_customer为空））
订单依据\u审核\u时间戳说明

然而，当我试图让它在Java中工作时，它根本不返回任何行。我认为这与地图上的价值观有关。在调试器中查看它们时，会显示“”而不是NULL

    String sqlText = "SELECT * "
            + "       FROM _audit "
            + "       WHERE DATEDIFF(NOW(), `_audit_timestamp`) < :days "
            + "       AND ((:Name IS NOT NULL AND _action__user = :Name) "
            + "           OR (_action__user = _action__user AND :Name IS NULL)) "
            + "       AND ((:SearchKey IS NOT NULL AND _action_searchkey = :SearchKey) "
            + "             OR (_action_searchkey = _action_searchkey AND :SearchKey IS NULL)) "
            + "       AND ((:Customer IS NOT NULL AND _action_customer = :Customer) "
            + "           OR (_action_customer = _action_customer AND :Customer IS NULL)) "
            + "       ORDER BY _audit_timestamp DESC";

    Map<String, String> parameters = new HashMap<String, String>();
    parameters.put("days", aqForm.getDays().toString());
    parameters.put("Name", aqForm.getName());
    parameters.put("SearchKey", aqForm.getSearchKey());
    parameters.put("Customer", aqForm.getCustomer());

String sqlText=“选择*
+“来自审计”
+“其中DATEDIFF（现在（），`u audit\u timestamp`）<：天”
+“和（：Name不为NULL且_action_uuser=：Name）”
+“或（_action_uuuuuser=_action_uuuuser AND:Name为NULL））”
+“和（（：SearchKey不为NULL且_action_SearchKey=：SearchKey）”
+“或（_action_searchkey=_action_searchkey AND:searchkey为NULL））”
+“和（（：Customer不为NULL且_action_Customer=：Customer）”
+“或（_action_customer=_action_customer AND:customer为NULL））”
+“订单审核时间戳描述”；
映射参数=新的HashMap（）；
parameters.put（“days”，aqForm.getDays（）.toString（））；
parameters.put（“Name”，aqForm.getName（））；
parameters.put（“SearchKey”，aqForm.getSearchKey（））；
parameters.put（“Customer”，aqForm.getCustomer（））；

---

我在这里选错树了吗？

在查询中用替换并尝试。

建议：不要在参数名称中交替使用大写和小写字符。一致性是关键。