动态 SQL ——之—— where

where 元素只会在至少有一个子元素的条件返回 SQL 子句的情况下才去插入“WHERE”子句。而且，若语句的开头为“AND”或“OR”，where 元素也会将它们去除。

---

SELECT * FROM TNotific

	
		and Method = #{method,jdbcType=VARCHAR}
	
	
		and StatusOfread = #{statusOfread,jdbcType=VARCHAR}
	

---

入参

String statusOfread = "0";

String method = "PUT";

SQL执行语句

SELECT * FROM TNotific WHERE Method = ? and StatusOfread = ?

---

入参

String statusOfread = null;

String method = "PUT";

SQL执行语句

SELECT * FROM TNotific WHERE Method = ?

---

入参

String statusOfread = null;

String method = null;

SQL执行语句

SELECT * FROM TNotific