mybatis和mysql简单的操作

带脑子的CV工程师2024-04-06 18:38

1.查询（Select）：

bash 复制代码

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）：

bash 复制代码

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）：

bash 复制代码

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）：

bash 复制代码

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