springboot 和 mybatis整合：

mapper定義的是數據庫的操作方法:

@Mapper public interface UserMapper {}

單參數的處理：

@Select("select * from t_user")@Results({@Result(property = "userId", column = "USER_ID"),@Result(property = "username", column = "USERNAME"),@Result(property = "password", column = "PASSWORD"),@Result(property = "mobileNum", column = "PHONE_NUM")})List<User> list();

多參數的處理：

/*** 延伸：無論什么方式,如果涉及多個參數,則必須加上@Param注解,否則無法使用EL表達式獲取參數。*/@Select("select * from t_user where username like #{username} and password like #{password}")@Results({@Result(property = "userId", column = "USER_ID"),@Result(property = "username", column = "USERNAME"),@Result(property = "password", column = "PASSWORD"),@Result(property = "mobileNum", column = "PHONE_NUM")})User get(@Param("username") String username, @Param("password") String password);

CRUD的高級注解：

@SelectProvider
@InsertProvider
@UpdateProvider
@DeleteProvider

先在mapper下定義Provider，所謂的Provider就是自定義的sql語句，規則可以自定義

public class UserSqlProvider {/*** 方式1：在工具類的方法里,可以自己手工編寫SQL。*/public String listByUsername(String username) {return "select * from t_user where username =#{username}";} }

然后定義使用這個sql語句的方法，就在對應的mapper里面操作：

/*** 方式2：使用注解指定某個工具類的方法來動態編寫SQL.*/@SelectProvider(type = UserSqlProvider.class, method = "listByUsername")@Results({@Result(property = "userId", column = "USER_ID"),@Result(property = "username", column = "USERNAME"),@Result(property = "password", column = "PASSWORD"),@Result(property = "mobileNum", column = "PHONE_NUM")})List<User> listByUsername(String username);

controller里面使用：

@GetMapping("list/{username}")public List<User> listByUsername(@PathVariable("username") String username) {return userMapper.listByUsername(username);}

another samples:

UserSqlProvider.java /*** 方式2：也可以根據官方提供的API來編寫動態SQL。*/public String getBadUser(@Param("username") String username, @Param("password") String password) {return new SQL() {{SELECT("*");FROM("t_user");if (username != null && password != null) {WHERE("username like #{username} and password like #{password}");} else {WHERE("1=2");}}}.toString();}UserMapper.java@SelectProvider(type = UserSqlProvider.class, method = "getBadUser")@Results({@Result(property = "userId", column = "USER_ID"),@Result(property = "username", column = "USERNAME"),@Result(property = "password", column = "PASSWORD"),@Result(property = "mobileNum", column = "PHONE_NUM")})User getBadUser(@Param("username") String username, @Param("password") String password);UserController.java@GetMapping("get/bad/{username}/{password}")public User getBadUser(@PathVariable("username") String username, @PathVariable("password") String password) {return userMapper.getBadUser(username, password);}

總結

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