ssm 联表修改 数据更新影响行数为0行，跪求大神指点。

Question

xml中是这样写的

Dao类

SmbmsbillQueryvo类

SmbmsbillCustom类

Controller类

jsp

控制台输出
DEBUG [http-apr-8080-exec-3] - ==> Preparing: UPDATE smbms_bill s1 JOIN smbms_provider s2 ON s1.providerId = s2.id SET s1.billCode = ?, s1.productName = ?, s2.proName = ?, s1.productCount = ?, s1.isPayment = ?, s1.creationDate = ? where s1.id = ?
DEBUG [http-apr-8080-exec-3] - ==> Parameters: null, null, null, null, null, null, null
DEBUG [http-apr-8080-exec-3] - <== Updates: 0

求大神指点

Answer 1

DEBUG [http-apr-8080-exec-3] - ==> Parameters: null, null, null, null, null, null, null
参数为null啊，所以肯定为0啊