1.查询（Select）：

MyBatis: 注解
@Select("SELECT * FROM users WHERE id = #{id}")
User selectUserById(int id);MyBatis: xml
<!-- 定义查询语句 -->
<select id="selectById" resultType="User">SELECT * FROM users WHERE id = #{id}
</select>MySQL 原生语法:
sql
SELECT * FROM users WHERE id = ?

2.插入（Insert）：

MyBatis: 注解
@Insert("INSERT INTO users (id, name, email) VALUES (#{id}, #{name}, #{email})")
void insertUser(User user);MyBatis: xml<!-- 定义插入语句 -->
<insert id="insertUser" parameterType="User">INSERT INTO users (id, username, email) VALUES (#{id}, #{username}, #{email})
</insert>MySQL 原生语法:
sql
INSERT INTO users (id, username, email) VALUES (?, ?, ?)

3.更新（Update）：

MyBatis: xml
<!-- 定义更新语句 -->
<update id="updateUser" parameterType="User">UPDATE users SET username = #{username}, email = #{email} WHERE id = #{id}
</update>MySQL 原生语法:
sql
UPDATE users SET username = ?, email = ? WHERE id = ?

4. 删除（Delete）：

MyBatis: 注解
@Select("SELECT * FROM users WHERE id = #{id}")
User selectUserById(int id);MyBatis: xml
<!-- 定义删除语句 -->
<delete id="deleteUserById">DELETE FROM users WHERE id = #{id}
</delete>MySQL 原生语法:
sql
DELETE FROM users WHERE id = ?

mybatis动态语法

https://editor.csdn.net/md/?articleId=136762588