Invalid bound statement (not found): com.exam.mapper.UserMapper.findbyid

• One 、 The emergence of problems ：

When debugging code , hold mapper.xml The method in is temporarily commented out , After uncommenting , That's the mistake . The specific errors are as follows ：

• Two 、 resolvent ：

1 . mapper.xml Medium namespace And the actual mapper The documents are inconsistent .

  As shown in figure of  namespace, It needs to be connected with mapper One A corresponding , Otherwise you will report an error . As shown in the figure below ,copy reference Back to namespace Can solve the problem .

 

2 . mapper Method names and in interfaces mapper.xml Medium id Labels are inconsistent

Here's the picture ,select id=“xxxxx” ,xxxxx Need and mapper The method names in the interface are the same .

  Of these two places findbyid It is necessary to keep the same .

 

3 . target In the catalog mapper.xml The content of the file is inconsistent with the current , Or not built target Catalog .

target The directory path is shown in the following figure ：

 

（1） target In the catalog mapper.xml The content of the file is inconsistent with the current

target Under the document mapper.xml:

  Current  mapper.xml:

  You can see target Of which I commented out at that time . Remove the comments to solve the problem .

（2） Not built into target Catalog .

stay IDEA The terminal executes the following code :

mvn clean

mvn compile