Wrong number of parameters: expected 0, was given 1 Query: select count(*) from product where pname like '%?%' Parameters: [%小%]

eclipse在dao层写的模糊查询sql：String sql = "select count(*) from product where pname like '%?%'"；

这样写会导致以下错误

Wrong number of parameters: expected 0, was given 1 Query: select count(*) from product where pname like '%?%' Parameters: [%小%]<br/>

原因：

系统并没有把sql里面的语句当成占位符？，只是当成了普通的字符。

如果在其他sql遇到这样的报错，

检查sql需要的参数个数（expected 0）和传递的参数个数（was given 1）是否一致

解决方法：

将sql改成:String sql = "select count(*) from product where pname like ?"；

然后将被占位的参数用 "%"+参数+"%"拼接作为模糊查询的条件<br/>

保证sql需要参数数量和给出的参数数量一致