What is the usage of selectOne in MyBatis?
In MyBatis, the selectOne method is used to execute a database query and return the first row of the result set. This method returns an object or null, and if the result set is empty, it will return null. When using the selectOne method, make sure the SQL statement only returns one result, otherwise a TooManyResultsException will be thrown. Here is an example code:
User user = sqlSession.selectOne("com.example.mapper.UserMapper.selectUserById", 1);
In the above example, the selectOne method will execute the SQL statement named “com.example.mapper.UserMapper.selectUserById”, passing in parameter 1, and returning the first data record in the query result set as a User object. If the query result is empty, it will return null.
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