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QwQ","https:\u002F\u002Fblog.mcxiaochen.top\u002Ffavicon.ico","https:\u002F\u002Fs0.wp.com\u002Fmshots\u002Fv1\u002Fhttps:\u002F\u002Fblog.mcxiaochen.top\u002F?w=400&h=300",{"id":309,"name":451,"url":452,"description":453,"avatar":454,"screenshot":455,"sort":253,"is_invalid":328},"mccsjs","https:\u002F\u002Fhexo.seln.cn\u002F","点一盏灯，等一个迷路的夜🍁🍁🍁","https:\u002F\u002Fadmin.strarry.top\u002Fuploads\u002F友情链接A\u002F2026\u002F08\u002F20260804093219_moc2g0tx.png","https:\u002F\u002Fhexo.seln.cn\u002Fimg\u002Fa.jpg",{"id":314,"name":457,"url":458,"description":7,"avatar":459,"screenshot":460,"sort":253,"is_invalid":328},"爱吃猫的鱼","https:\u002F\u002Fblog.talen.top","https:\u002F\u002Fimage.talen.top\u002F20251229184705_wgsva7g9.png","https:\u002F\u002Fimage.talen.top\u002F20260413160405_7w8hvvun.png",{"id":201,"name":462,"url":463,"description":462,"avatar":464,"screenshot":465,"sort":201,"is_invalid":328},"小笨蛋技术网","http:\u002F\u002F200655.xyz","https:\u002F\u002Fcdn.200655.xyz\u002Flogo\u002Fhead\u002Fxbd.png","https:\u002F\u002Fs0.wp.com\u002Fmshots\u002Fv1\u002Fhttp:\u002F\u002F200655.xyz\u002F?w=400&h=300",{"id":175,"name":467,"url":468,"description":469,"avatar":470,"screenshot":471,"sort":175,"is_invalid":328},"SDWL-博客","https:\u002F\u002Fblog.iokb.cn\u002F","Good Luck To You!","https:\u002F\u002Fblog.iokb.cn\u002Fzb_users\u002Fupload\u002F2022\u002F03\u002F202203091646757255754905.jpg","https:\u002F\u002Fs0.wp.com\u002Fmshots\u002Fv1\u002Fhttps:\u002F\u002Fblog.iokb.cn\u002F?w=400&h=300",{"id":170,"name":473,"url":474,"description":475,"avatar":476,"screenshot":477,"sort":170,"is_invalid":328},"无影大侠的小站","https:\u002F\u002Fblog.skyshadow.fun\u002F","在互联网留下一个脚印","https:\u002F\u002Fweavatar.com\u002Favatar\u002F7388ea4765a319d5f83fea61c3236384?s=1000","https:\u002F\u002Fs0.wp.com\u002Fmshots\u002Fv1\u002Fhttps:\u002F\u002Fblog.skyshadow.fun\u002F?w=400&h=300",{"id":162,"title":479,"slug":480,"content":481,"summary":482,"ai_summary":483,"cover":484,"location":11,"is_top":328,"is_essence":328,"is_outdated":328,"view_count":485,"comment_count":486,"url":487,"publish_time":488,"update_time":489,"category":490,"tags":493,"prev":497,"next":500},"后端开发：MyBatis的快速复习","mybatis-quick-review","## 一、MyBatis环境搭建\n\n### 1. 引入相关Maven依赖\n\n在 `pom.xml` 中引入 MyBatis + 数据库驱动（本文使用MySQL为例）：\n\n~~~xml\n\u003Cdependencies>\n    \u003C!-- MyBatis 核心依赖 -->\n    \u003Cdependency>\n        \u003CgroupId>org.mybatis\u003C\u002FgroupId>\n        \u003CartifactId>mybatis\u003C\u002FartifactId>\n        \u003Cversion>3.5.15\u003C\u002Fversion>\n    \u003C\u002Fdependency>\n\n    \u003C!-- MyBatis 与 SpringBoot 整合 -->\n    \u003Cdependency>\n        \u003CgroupId>org.mybatis.spring.boot\u003C\u002FgroupId>\n        \u003CartifactId>mybatis-spring-boot-starter\u003C\u002FartifactId>\n        \u003Cversion>3.0.3\u003C\u002Fversion>\n    \u003C\u002Fdependency>\n\n    \u003C!-- MySQL 驱动 -->\n    \u003Cdependency>\n        \u003CgroupId>mysql\u003C\u002FgroupId>\n        \u003CartifactId>mysql-connector-java\u003C\u002FartifactId>\n        \u003Cversion>8.0.33\u003C\u002Fversion>\n    \u003C\u002Fdependency>\n\n    \u003C!-- Lombok（简化实体类） -->\n    \u003Cdependency>\n        \u003CgroupId>org.projectlombok\u003C\u002FgroupId>\n        \u003CartifactId>lombok\u003C\u002FartifactId>\n        \u003Cversion>1.18.32\u003C\u002Fversion>\n    \u003C\u002Fdependency>\n\u003C\u002Fdependencies>\n\n~~~\n\n### 2. 数据库连接配置（application.yml）\n\n```yaml\nspring:\n  datasource:\n    url: jdbc:mysql:\u002F\u002Flocalhost:3306\u002Fmybatis_demo?useSSL=false&serverTimezone=UTC\n    username: root\n    password: root\n    driver-class-name: com.mysql.cj.jdbc.Driver\n\nmybatis:\n  mapper-locations: classpath:mapper\u002F*.xml\n  type-aliases-package: com.example.demo.domain\n```\n\n## 二、准备测试表（单表 & 多表）\n\n以下建表语句和相关的测试数据由`ChatGPT5`生成。\n\n```sql\n-- 建库\nCREATE DATABASE IF NOT EXISTS mybatis_demo DEFAULT CHARSET utf8mb4;\nUSE mybatis_demo;\n\n-- 用户表\nDROP TABLE IF EXISTS user;\nCREATE TABLE user (\n  id BIGINT PRIMARY KEY AUTO_INCREMENT,\n  username VARCHAR(50) NOT NULL,\n  email VARCHAR(100),\n  age INT,\n  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\n-- 订单表\nDROP TABLE IF EXISTS orders;\nCREATE TABLE orders (\n  id BIGINT PRIMARY KEY AUTO_INCREMENT,\n  user_id BIGINT NOT NULL,\n  order_no VARCHAR(50) NOT NULL,\n  amount DECIMAL(10,2),\n  status TINYINT DEFAULT 0,      -- 0:待支付 1:已支付 2:已取消\n  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,\n  FOREIGN KEY (user_id) REFERENCES user(id)\n);\n\n-- 产品表\nDROP TABLE IF EXISTS product;\nCREATE TABLE product (\n  id BIGINT PRIMARY KEY AUTO_INCREMENT,\n  name VARCHAR(100) NOT NULL,\n  price DECIMAL(10,2) NOT NULL,\n  category VARCHAR(50)\n);\n\n-- 订单明细表\nDROP TABLE IF EXISTS order_item;\nCREATE TABLE order_item (\n  id BIGINT PRIMARY KEY AUTO_INCREMENT,\n  order_id BIGINT NOT NULL,\n  product_id BIGINT NOT NULL,\n  quantity INT NOT NULL,\n  item_amount DECIMAL(10,2) GENERATED ALWAYS AS (quantity * 1.0) VIRTUAL,\n  FOREIGN KEY (order_id) REFERENCES orders(id),\n  FOREIGN KEY (product_id) REFERENCES product(id)\n);\n\n-- 测试数据\nINSERT INTO user (username,email,age) VALUES\n(\\'alice\\',\\'alice@example.com\\',23),\n(\\'bob\\',\\'bob@example.com\\',28),\n(\\'charlie\\',\\'charlie@example.com\\',31),\n(\\'dora\\',\\'dora@example.com\\',26);\n\nINSERT INTO product (name,price,category) VALUES\n(\\'iPhone 15\\', 8999.00, \\'phone\\'),\n(\\'iPad Air\\',  4999.00, \\'tablet\\'),\n(\\'ThinkPad X1\\', 12999.00, \\'laptop\\'),\n(\\'AirPods Pro\\', 1999.00, \\'audio\\'),\n(\\'Kindle Scribe\\', 2999.00, \\'reader\\');\n\nINSERT INTO orders (user_id, order_no, amount, status) VALUES\n(1, \\'A202501-0001\\',  1999.00, 1),\n(1, \\'A202501-0002\\', 10998.00, 1),\n(2, \\'B202501-0003\\',  4999.00, 0),\n(3, \\'C202501-0004\\', 12999.00, 2),\n(3, \\'C202501-0005\\',  1999.00, 1);\n\nINSERT INTO order_item (order_id, product_id, quantity) VALUES\n(1, 4, 1),                    -- alice 买 AirPods Pro\n(2, 1, 1), (2, 2, 1),         -- alice 买 iPhone + iPad\n(3, 2, 1),                    -- bob 预下 iPad\n(4, 3, 1),                    -- charlie 取消 ThinkPad X1\n(5, 4, 1);                    -- charlie 买 AirPods\n```\n\n设计以上几个表可以覆盖：\n\n- **单表查询** → `user`\n- **一对多** → `user` 和 `orders`\n- **多对多** → `orders` 和 `product` 通过 `order_item`\n\n## 三、使用MyBatis进行CRUD回顾\n\n### 1. 使用Lombok快速编写实体类\n\n~~~java\n\u002F\u002F User.java\n@Data\npublic class User {\n  private Long id;\n  private String username;\n  private String email;\n  private Integer age;\n  private LocalDateTime createdAt;\n  private List\u003COrder> orders; \u002F\u002F 一对多\n}\n\n\u002F\u002F Order.java\n@Data\npublic class Order {\n  private Long id;\n  private Long userId;\n  private String orderNo;\n  private BigDecimal amount;\n  private Integer status;\n  private LocalDateTime createdAt;\n  private User user;                 \u002F\u002F 一对一（下单用户）\n  private List\u003CProduct> products;    \u002F\u002F 多对多（通过明细）\n}\n\n\u002F\u002F Product.java\n@Data\npublic class Product {\n  private Long id;\n  private String name;\n  private BigDecimal price;\n  private String category;\n}\n\n\u002F\u002F OrderItem.java\n@Data\npublic class OrderItem {\n  private Long id;\n  private Long orderId;\n  private Long productId;\n  private Integer quantity;\n}\n~~~\n\n# 四、Mapper 接口定义\n\n```java\npublic interface UserMapper {\n  User selectById(Long id);\n  List\u003CUser> selectAll();\n  int insert(User u);\n  int update(User u);\n  int delete(Long id);\n\n  \u002F\u002F 动态查询\n  List\u003CUser> query(@Param(\\\"username\\\") String username,\n                   @Param(\\\"minAge\\\") Integer minAge,\n                   @Param(\\\"maxAge\\\") Integer maxAge,\n                   @Param(\\\"ids\\\") List\u003CLong> ids);\n\n  \u002F\u002F 一对多（结果集映射）\n  User selectUserWithOrders(Long id);\n\n  \u002F\u002F 分页（简单 LIMIT）\n  List\u003CUser> page(@Param(\\\"offset\\\") int offset, @Param(\\\"size\\\") int size);\n}\n\npublic interface OrderMapper {\n  Order selectOrderWithUser(Long id);            \u002F\u002F association 嵌套对象\n  Order selectOrderWithProducts(Long id);        \u002F\u002F collection 多对多\n  int insert(Order o);\n  int insertUseSelectKey(Order o);\n}\n\npublic interface ProductMapper {\n  List\u003CProduct> selectByCategory(@Param(\\\"category\\\") String category);\n}\n```\n\n# 五、使用XML标签编写SQL语句\n\n> 放在 `resources\u002Fmapper\u002F*.xml`。以下示例以 `UserMapper.xml` \u002F `OrderMapper.xml` 为主，**每个常用标签都有最小可运行示例**。\n\n## 0）顶层与命名空间：`\u003Cmapper namespace=\\\"...\\\">`\n\n```xml\n\u003C!-- UserMapper.xml -->\n\u003Cmapper namespace=\\\"com.example.demo.mapper.UserMapper\\\">\n  \u003C!-- 具体语句见下 -->\n\u003C\u002Fmapper>\n```\n\n- **namespace** 必须与接口全限定名一致，方法名与子标签 `id` 对应。\n\n## 1）基础 CRUD：`\u003Cselect>\u002F\u003Cinsert>\u002F\u003Cupdate>\u002F\u003Cdelete>`\n\n```xml\n\u003C!-- resultType 可用别名（配置了 type-aliases-package） -->\n\u003Cselect id=\\\"selectById\\\" parameterType=\\\"long\\\" resultType=\\\"User\\\">\n  SELECT id, username, email, age, created_at\n  FROM user\n  WHERE id = #{id}\n\u003C\u002Fselect>\n\n\u003Cselect id=\\\"selectAll\\\" resultType=\\\"User\\\">\n  SELECT id, username, email, age, created_at FROM user\n\u003C\u002Fselect>\n\n\u003Cinsert id=\\\"insert\\\" parameterType=\\\"User\\\" useGeneratedKeys=\\\"true\\\" keyProperty=\\\"id\\\">\n  INSERT INTO user (username, email, age)\n  VALUES (#{username}, #{email}, #{age})\n\u003C\u002Finsert>\n\n\u003Cupdate id=\\\"update\\\" parameterType=\\\"User\\\">\n  UPDATE user\n  \u003Cset>\n    \u003Cif test=\\\"username!=null\\\">username=#{username},\u003C\u002Fif>\n    \u003Cif test=\\\"email!=null\\\">email=#{email},\u003C\u002Fif>\n    \u003Cif test=\\\"age!=null\\\">age=#{age},\u003C\u002Fif>\n  \u003C\u002Fset>\n  WHERE id=#{id}\n\u003C\u002Fupdate>\n\n\u003Cdelete id=\\\"delete\\\" parameterType=\\\"long\\\">\n  DELETE FROM user WHERE id=#{id}\n\u003C\u002Fdelete>\n```\n\n**要点：**\n\n- `useGeneratedKeys + keyProperty`：MySQL\u002FJDBC 自动回填主键。\n- `parameterType`\u002F`resultType`：参数\u002F返回类型（类名或别名）。\n\n## 2）结果映射：`\u003CresultMap>`、`\u003Cid>`、`\u003Cresult>`、`\u003Cassociation>`、`\u003Ccollection>`、`ofType`、`property`、`column`\n\n```xml\n\u003C!-- 一对多：用户 + 订单列表 -->\n\u003CresultMap id=\\\"UserWithOrdersRM\\\" type=\\\"User\\\">\n  \u003Cid     property=\\\"id\\\"        column=\\\"u_id\\\"\u002F>\n  \u003Cresult property=\\\"username\\\"  column=\\\"username\\\"\u002F>\n  \u003Cresult property=\\\"email\\\"     column=\\\"email\\\"\u002F>\n  \u003Cresult property=\\\"age\\\"       column=\\\"age\\\"\u002F>\n  \u003Ccollection property=\\\"orders\\\" ofType=\\\"Order\\\">\n    \u003Cid     property=\\\"id\\\"       column=\\\"o_id\\\"\u002F>\n    \u003Cresult property=\\\"orderNo\\\"  column=\\\"order_no\\\"\u002F>\n    \u003Cresult property=\\\"amount\\\"   column=\\\"amount\\\"\u002F>\n    \u003Cresult property=\\\"status\\\"   column=\\\"status\\\"\u002F>\n    \u003Cresult property=\\\"createdAt\\\" column=\\\"o_created_at\\\"\u002F>\n  \u003C\u002Fcollection>\n\u003C\u002FresultMap>\n\n\u003Cselect id=\\\"selectUserWithOrders\\\" resultMap=\\\"UserWithOrdersRM\\\">\n  SELECT\n    u.id u_id, u.username, u.email, u.age,\n    o.id o_id, o.order_no, o.amount, o.status, o.created_at o_created_at\n  FROM user u\n  LEFT JOIN orders o ON u.id = o.user_id\n  WHERE u.id = #{id}\n\u003C\u002Fselect>\n```\n\n**要点：**\n\n- `property`：Java 字段名；`column`：SQL 列或别名。\n- `ofType`：集合元素类型（常用于 `\u003Ccollection>`）。\n\n## 3）嵌套查询（分步查询）与懒加载：`association select` \u002F `collection select`、`fetchType`\n\n```xml\n\u003C!-- OrderMapper.xml -->\n\u003CresultMap id=\\\"OrderWithUserRM\\\" type=\\\"Order\\\">\n  \u003Cid     property=\\\"id\\\"      column=\\\"id\\\"\u002F>\n  \u003Cresult property=\\\"orderNo\\\" column=\\\"order_no\\\"\u002F>\n  \u003Cresult property=\\\"amount\\\"  column=\\\"amount\\\"\u002F>\n  \u003Cassociation property=\\\"user\\\" javaType=\\\"User\\\"\n               column=\\\"user_id\\\" select=\\\"com.example.demo.mapper.UserMapper.selectById\\\"\n               fetchType=\\\"lazy\\\"\u002F>\n\u003C\u002FresultMap>\n\n\u003Cselect id=\\\"selectOrderWithUser\\\" resultMap=\\\"OrderWithUserRM\\\">\n  SELECT id, user_id, order_no, amount FROM orders WHERE id=#{id}\n\u003C\u002Fselect>\n```\n\n**要点：**\n\n- `select=\\\"namespace.method\\\"`：把某列（通过 `column` 指定）作为参数传给另一个 `select`。\n- 配合全局 `lazy-loading-enabled: true` 可懒加载，避免一次性拉大对象图。\n\n## 4）多对多（订单 → 产品列表）：`\u003Ccollection>` + 连接查询\n\n```xml\n\u003C!-- OrderMapper.xml -->\n\u003CresultMap id=\\\"OrderWithProductsRM\\\" type=\\\"Order\\\">\n  \u003Cid     property=\\\"id\\\"       column=\\\"o_id\\\"\u002F>\n  \u003Cresult property=\\\"orderNo\\\"  column=\\\"order_no\\\"\u002F>\n  \u003Cresult property=\\\"amount\\\"   column=\\\"amount\\\"\u002F>\n  \u003Ccollection property=\\\"products\\\" ofType=\\\"Product\\\">\n    \u003Cid     property=\\\"id\\\"     column=\\\"p_id\\\"\u002F>\n    \u003Cresult property=\\\"name\\\"   column=\\\"p_name\\\"\u002F>\n    \u003Cresult property=\\\"price\\\"  column=\\\"price\\\"\u002F>\n    \u003Cresult property=\\\"category\\\" column=\\\"category\\\"\u002F>\n  \u003C\u002Fcollection>\n\u003C\u002FresultMap>\n\n\u003Cselect id=\\\"selectOrderWithProducts\\\" resultMap=\\\"OrderWithProductsRM\\\">\n  SELECT\n    o.id o_id, o.order_no, o.amount,\n    p.id p_id, p.name p_name, p.price, p.category\n  FROM orders o\n  LEFT JOIN order_item oi ON o.id=oi.order_id\n  LEFT JOIN product p ON oi.product_id=p.id\n  WHERE o.id=#{id}\n\u003C\u002Fselect>\n```\n\n## 5）SQL 片段复用：`\u003Csql>` + `\u003Cinclude>`\n\n```xml\n\u003Csql id=\\\"UserColumns\\\">\n  id, username, email, age, created_at\n\u003C\u002Fsql>\n\n\u003Cselect id=\\\"page\\\" resultType=\\\"User\\\">\n  SELECT \u003Cinclude refid=\\\"UserColumns\\\"\u002F>\n  FROM user\n  ORDER BY id DESC\n  LIMIT #{offset}, #{size}\n\u003C\u002Fselect>\n```\n\n## 6）动态 SQL（开发中使用较多）\n\n### 6.1 `\u003Cif>` + `\u003Cwhere>`：自动处理 AND\u002FOR\n\n```xml\n\u003Cselect id=\\\"query\\\" resultType=\\\"User\\\">\n  SELECT id, username, email, age, created_at\n  FROM user\n  \u003Cwhere>\n    \u003Cif test=\\\"username != null and username != \\'\\'\\\">\n      AND username LIKE CONCAT(\\'%\\', #{username}, \\'%\\')\n    \u003C\u002Fif>\n    \u003Cif test=\\\"minAge != null\\\"> AND age >= #{minAge}\u003C\u002Fif>\n    \u003Cif test=\\\"maxAge != null\\\"> AND age <= #{maxAge}\u003C\u002Fif>\n    \u003Cif test=\\\"ids != null and ids.size() > 0\\\">\n      AND id IN\n      \u003Cforeach collection=\\\"ids\\\" item=\\\"id\\\" open=\\\"(\\\" separator=\\\",\\\" close=\\\")\\\">\n        #{id}\n      \u003C\u002Fforeach>\n    \u003C\u002Fif>\n  \u003C\u002Fwhere>\n\u003C\u002Fselect>\n```\n\n### 6.2 `\u003Cchoose>\u002F\u003Cwhen>\u002F\u003Cotherwise>`：分支\n\n```xml\n\u003Cselect id=\\\"chooseExample\\\" resultType=\\\"User\\\">\n  SELECT id, username, email, age, created_at\n  FROM user\n  \u003Cwhere>\n    \u003Cchoose>\n      \u003Cwhen test=\\\"username != null\\\"> username = #{username} \u003C\u002Fwhen>\n      \u003Cwhen test=\\\"minAge != null\\\"> age >= #{minAge} \u003C\u002Fwhen>\n      \u003Cotherwise> age IS NOT NULL \u003C\u002Fotherwise>\n    \u003C\u002Fchoose>\n  \u003C\u002Fwhere>\n\u003C\u002Fselect>\n```\n\n### 6.3 `\u003Cforeach>`：遍历 List \u002F Map\n\n```xml\n\u003C!-- List 参数：ids -->\n\u003Cselect id=\\\"selectByIds\\\" resultType=\\\"User\\\">\n  SELECT id, username, email, age, created_at\n  FROM user\n  WHERE id IN\n  \u003Cforeach collection=\\\"ids\\\" item=\\\"id\\\" open=\\\"(\\\" separator=\\\",\\\" close=\\\")\\\">\n    #{id}\n  \u003C\u002Fforeach>\n\u003C\u002Fselect>\n\n\u003C!-- Map 参数：map.put(\\\"k1\\\",\\\"v1\\\") -->\n\u003Cselect id=\\\"foreachMap\\\" resultType=\\\"map\\\">\n  SELECT #{map[\\'k1\\']} AS k1_value\n\u003C\u002Fselect>\n```\n\n### 6.4 `\u003Cset>`：动态 UPDATE 字段\n\n```xml\n\u003Cupdate id=\\\"dynamicUpdate\\\" parameterType=\\\"User\\\">\n  UPDATE user\n  \u003Cset>\n    \u003Cif test=\\\"username!=null\\\"> username=#{username},\u003C\u002Fif>\n    \u003Cif test=\\\"email!=null\\\"> email=#{email},\u003C\u002Fif>\n    \u003Cif test=\\\"age!=null\\\"> age=#{age},\u003C\u002Fif>\n  \u003C\u002Fset>\n  WHERE id=#{id}\n\u003C\u002Fupdate>\n```\n\n### 6.5 `\u003Ctrim>`：灵活控制前后缀\n\n```xml\n\u003Cupdate id=\\\"updateWithTrim\\\" parameterType=\\\"User\\\">\n  UPDATE user\n  \u003Ctrim prefix=\\\"SET\\\" suffixOverrides=\\\",\\\">\n    \u003Cif test=\\\"username!=null\\\"> username=#{username},\u003C\u002Fif>\n    \u003Cif test=\\\"email!=null\\\"> email=#{email},\u003C\u002Fif>\n    \u003Cif test=\\\"age!=null\\\"> age=#{age},\u003C\u002Fif>\n  \u003C\u002Ftrim>\n  WHERE id=#{id}\n\u003C\u002Fupdate>\n```\n\n### 6.6 `\u003Cbind>`：绑定变量（常用于 LIKE）\n\n```xml\n\u003Cselect id=\\\"likeQuery\\\" resultType=\\\"User\\\">\n  \u003Cbind name=\\\"kw\\\" value=\\\"\\'%\\' + _parameter + \\'%\\'\\\" \u002F>\n  SELECT id, username, email, age, created_at\n  FROM user\n  WHERE username LIKE #{kw}\n\u003C\u002Fselect>\n```\n\n> 传入参数是一个字符串时，`_parameter` 指它本身。\n\n## 7）主键策略：`useGeneratedKeys` 与 `\u003CselectKey>`\n\n```xml\n\u003C!-- MySQL 推荐：useGeneratedKeys -->\n\u003Cinsert id=\\\"insert\\\" parameterType=\\\"User\\\" useGeneratedKeys=\\\"true\\\" keyProperty=\\\"id\\\">\n  INSERT INTO user (username,email,age) VALUES (#{username},#{email},#{age})\n\u003C\u002Finsert>\n\n\u003C!-- 兼容序列的写法（例如 Oracle \u002F PG 有 sequence） -->\n\u003Cinsert id=\\\"insertUseSelectKey\\\" parameterType=\\\"Order\\\">\n  \u003CselectKey keyProperty=\\\"id\\\" resultType=\\\"long\\\" order=\\\"BEFORE\\\">\n    SELECT nextval(\\'order_seq\\')\n  \u003C\u002FselectKey>\n  INSERT INTO orders (id, user_id, order_no, amount, status)\n  VALUES (#{id}, #{userId}, #{orderNo}, #{amount}, #{status})\n\u003C\u002Finsert>\n```\n\n## 8）构造器映射 & 鉴别器：`\u003Cconstructor>`、`\u003Cdiscriminator>`\n\n```xml\n\u003C!-- 用构造器给不可变对象赋值 -->\n\u003CresultMap id=\\\"UserCtorRM\\\" type=\\\"User\\\">\n  \u003Cconstructor>\n    \u003CidArg    column=\\\"id\\\"        javaType=\\\"long\\\"\u002F>\n    \u003Carg      column=\\\"username\\\"  javaType=\\\"string\\\"\u002F>\n    \u003Carg      column=\\\"email\\\"     javaType=\\\"string\\\"\u002F>\n    \u003Carg      column=\\\"age\\\"       javaType=\\\"int\\\"\u002F>\n  \u003C\u002Fconstructor>\n\u003C\u002FresultMap>\n\n\u003C!-- discriminator：根据列值映射不同结构（示例性） -->\n\u003CresultMap id=\\\"OrderWithStatusRM\\\" type=\\\"Order\\\">\n  \u003Cid property=\\\"id\\\" column=\\\"id\\\"\u002F>\n  \u003Cresult property=\\\"orderNo\\\" column=\\\"order_no\\\"\u002F>\n  \u003Cresult property=\\\"status\\\"  column=\\\"status\\\"\u002F>\n  \u003Cdiscriminator javaType=\\\"int\\\" column=\\\"status\\\">\n    \u003Ccase value=\\\"0\\\">\n      \u003Cresult property=\\\"amount\\\" column=\\\"amount\\\"\u002F>\n    \u003C\u002Fcase>\n    \u003Ccase value=\\\"1\\\">\n      \u003Cresult property=\\\"amount\\\" column=\\\"amount\\\"\u002F>\n    \u003C\u002Fcase>\n    \u003Ccase value=\\\"2\\\">\n      \u003Cresult property=\\\"amount\\\" column=\\\"amount\\\"\u002F>\n    \u003C\u002Fcase>\n  \u003C\u002Fdiscriminator>\n\u003C\u002FresultMap>\n\n\u003Cselect id=\\\"selectOrderDiscriminator\\\" resultMap=\\\"OrderWithStatusRM\\\">\n  SELECT id, order_no, amount, status FROM orders WHERE id=#{id}\n\u003C\u002Fselect>\n```\n\n## 9）存储过程 \u002F 多结果集：`statementType=\\\"CALLABLE\\\"`、`resultSets`（知道即可）\n\n```xml\n\u003Cselect id=\\\"callProc\\\" statementType=\\\"CALLABLE\\\">\n  { call proc_recalc_order_amount(#{orderId, mode=IN}) }\n\u003C\u002Fselect>\n```\n\n> 多结果集时可用 `resultSets=\\\"rs1,rs2\\\"` 配合多个 `resultMap`（不同库支持度差异较大）。\n\n## 10）缓存：`\u003Ccache>`、`\u003Ccache-ref>`（二级缓存）\n\n```xml\n\u003C!-- 当前 mapper 开启二级缓存 -->\n\u003Ccache eviction=\\\"LRU\\\" flushInterval=\\\"60000\\\" size=\\\"512\\\" readOnly=\\\"false\\\"\u002F>\n\n\u003C!-- 引用别的命名空间的缓存 -->\n\u003C!-- \u003Ccache-ref namespace=\\\"com.example.demo.mapper.OtherMapper\\\"\u002F> -->\n```\n\n**要点：**\n\n- 二级缓存是跨 SqlSession 的；**更新会清理**对应命名空间的缓存。\n- 生产环境慎用，注意与数据一致性、事务提交时机的关系。\n\n## 11）数据库差异：`databaseId`（同一语句不同方言）\n\n```xml\n\u003Cselect id=\\\"selectNow\\\" resultType=\\\"string\\\" databaseId=\\\"mysql\\\">\n  SELECT DATE_FORMAT(NOW(), \\'%Y-%m-%d %H:%i:%s\\')\n\u003C\u002Fselect>\n\n\u003Cselect id=\\\"selectNow\\\" resultType=\\\"string\\\" databaseId=\\\"postgresql\\\">\n  SELECT TO_CHAR(NOW(), \\'YYYY-MM-DD HH24:MI:SS\\')\n\u003C\u002Fselect>\n```\n\n> 需在全局配置里开启 `databaseIdProvider`（Spring Boot 多用 starter 自动识别）。\n\n## 12）resultType 的多种返回：`POJO \u002F Map \u002F 基本类型`\n\n```xml\n\u003C!-- 返回 Map -->\n\u003Cselect id=\\\"countByStatus\\\" resultType=\\\"map\\\">\n  SELECT status, COUNT(*) cnt FROM orders GROUP BY status\n\u003C\u002Fselect>\n\n\u003C!-- 返回基本类型 -->\n\u003Cselect id=\\\"countUser\\\" resultType=\\\"long\\\">\n  SELECT COUNT(*) FROM user\n\u003C\u002Fselect>\n```\n\n# 六、综合实战片段（把常用点串一遍）\n\n```xml\n\u003C!-- UserMapper.xml -->\n\u003Cmapper namespace=\\\"com.example.demo.mapper.UserMapper\\\">\n\n  \u003Ccache eviction=\\\"LRU\\\" size=\\\"256\\\"\u002F>\n\n  \u003Csql id=\\\"BaseCols\\\">id, username, email, age, created_at\u003C\u002Fsql>\n\n  \u003Cselect id=\\\"selectById\\\" parameterType=\\\"long\\\" resultType=\\\"User\\\">\n    SELECT \u003Cinclude refid=\\\"BaseCols\\\"\u002F> FROM user WHERE id=#{id}\n  \u003C\u002Fselect>\n\n  \u003Cselect id=\\\"selectAll\\\" resultType=\\\"User\\\">\n    SELECT \u003Cinclude refid=\\\"BaseCols\\\"\u002F> FROM user ORDER BY id\n  \u003C\u002Fselect>\n\n  \u003Cinsert id=\\\"insert\\\" parameterType=\\\"User\\\" useGeneratedKeys=\\\"true\\\" keyProperty=\\\"id\\\">\n    INSERT INTO user (username,email,age) VALUES (#{username},#{email},#{age})\n  \u003C\u002Finsert>\n\n  \u003Cupdate id=\\\"dynamicUpdate\\\" parameterType=\\\"User\\\">\n    UPDATE user\n    \u003Ctrim prefix=\\\"SET\\\" suffixOverrides=\\\",\\\">\n      \u003Cif test=\\\"username!=null\\\">username=#{username},\u003C\u002Fif>\n      \u003Cif test=\\\"email!=null\\\">email=#{email},\u003C\u002Fif>\n      \u003Cif test=\\\"age!=null\\\">age=#{age},\u003C\u002Fif>\n    \u003C\u002Ftrim>\n    WHERE id=#{id}\n  \u003C\u002Fupdate>\n\n  \u003Cdelete id=\\\"delete\\\" parameterType=\\\"long\\\">\n    DELETE FROM user WHERE id=#{id}\n  \u003C\u002Fdelete>\n\n  \u003Cselect id=\\\"query\\\" resultType=\\\"User\\\">\n    SELECT \u003Cinclude refid=\\\"BaseCols\\\"\u002F> FROM user\n    \u003Cwhere>\n      \u003Cif test=\\\"username!=null and username!=\\'\\'\\\">\n        AND username LIKE CONCAT(\\'%\\', #{username}, \\'%\\')\n      \u003C\u002Fif>\n      \u003Cif test=\\\"minAge!=null\\\"> AND age >= #{minAge}\u003C\u002Fif>\n      \u003Cif test=\\\"maxAge!=null\\\"> AND age <= #{maxAge}\u003C\u002Fif>\n      \u003Cif test=\\\"ids!=null and ids.size()>0\\\">\n        AND id IN\n        \u003Cforeach collection=\\\"ids\\\" item=\\\"id\\\" open=\\\"(\\\" separator=\\\",\\\" close=\\\")\\\">\n          #{id}\n        \u003C\u002Fforeach>\n      \u003C\u002Fif>\n    \u003C\u002Fwhere>\n  \u003C\u002Fselect>\n\n  \u003C!-- 一对多 -->\n  \u003CresultMap id=\\\"UserWithOrdersRM\\\" type=\\\"User\\\">\n    \u003Cid     property=\\\"id\\\"        column=\\\"u_id\\\"\u002F>\n    \u003Cresult property=\\\"username\\\"  column=\\\"username\\\"\u002F>\n    \u003Cresult property=\\\"email\\\"     column=\\\"email\\\"\u002F>\n    \u003Cresult property=\\\"age\\\"       column=\\\"age\\\"\u002F>\n    \u003Ccollection property=\\\"orders\\\" ofType=\\\"Order\\\">\n      \u003Cid     property=\\\"id\\\"       column=\\\"o_id\\\"\u002F>\n      \u003Cresult property=\\\"orderNo\\\"  column=\\\"order_no\\\"\u002F>\n      \u003Cresult property=\\\"amount\\\"   column=\\\"amount\\\"\u002F>\n      \u003Cresult property=\\\"status\\\"   column=\\\"status\\\"\u002F>\n      \u003Cresult property=\\\"createdAt\\\" column=\\\"o_created_at\\\"\u002F>\n    \u003C\u002Fcollection>\n  \u003C\u002FresultMap>\n\n  \u003Cselect id=\\\"selectUserWithOrders\\\" resultMap=\\\"UserWithOrdersRM\\\">\n    SELECT\n      u.id u_id, u.username, u.email, u.age,\n      o.id o_id, o.order_no, o.amount, o.status, o.created_at o_created_at\n    FROM user u\n    LEFT JOIN orders o ON u.id = o.user_id\n    WHERE u.id = #{id}\n  \u003C\u002Fselect>\n\n  \u003C!-- 分页 -->\n  \u003Cselect id=\\\"page\\\" resultType=\\\"User\\\">\n    SELECT \u003Cinclude refid=\\\"BaseCols\\\"\u002F> FROM user\n    ORDER BY id DESC\n    LIMIT #{offset}, #{size}\n  \u003C\u002Fselect>\n\n\u003C\u002Fmapper>\n```\n\n~~~xml\n\u003C!-- OrderMapper.xml -->\n\u003Cmapper namespace=\\\"com.example.demo.mapper.OrderMapper\\\">\n\n  \u003C!-- association：订单带用户（分步 + 懒加载） -->\n  \u003CresultMap id=\\\"OrderWithUserRM\\\" type=\\\"Order\\\">\n    \u003Cid     property=\\\"id\\\"      column=\\\"id\\\"\u002F>\n    \u003Cresult property=\\\"orderNo\\\" column=\\\"order_no\\\"\u002F>\n    \u003Cresult property=\\\"amount\\\"  column=\\\"amount\\\"\u002F>\n    \u003Cassociation property=\\\"user\\\" javaType=\\\"User\\\"\n                 column=\\\"user_id\\\" select=\\\"com.example.demo.mapper.UserMapper.selectById\\\"\n                 fetchType=\\\"lazy\\\"\u002F>\n  \u003C\u002FresultMap>\n\n  \u003Cselect id=\\\"selectOrderWithUser\\\" resultMap=\\\"OrderWithUserRM\\\">\n    SELECT id, user_id, order_no, amount FROM orders WHERE id=#{id}\n  \u003C\u002Fselect>\n\n  \u003C!-- 多对多：订单带产品列表 -->\n  \u003CresultMap id=\\\"OrderWithProductsRM\\\" type=\\\"Order\\\">\n    \u003Cid     property=\\\"id\\\"       column=\\\"o_id\\\"\u002F>\n    \u003Cresult property=\\\"orderNo\\\"  column=\\\"order_no\\\"\u002F>\n    \u003Cresult property=\\\"amount\\\"   column=\\\"amount\\\"\u002F>\n    \u003Ccollection property=\\\"products\\\" ofType=\\\"Product\\\">\n      \u003Cid     property=\\\"id\\\"     column=\\\"p_id\\\"\u002F>\n      \u003Cresult property=\\\"name\\\"   column=\\\"p_name\\\"\u002F>\n      \u003Cresult property=\\\"price\\\"  column=\\\"price\\\"\u002F>\n      \u003Cresult property=\\\"category\\\" column=\\\"category\\\"\u002F>\n    \u003C\u002Fcollection>\n  \u003C\u002FresultMap>\n\n  \u003Cselect id=\\\"selectOrderWithProducts\\\" resultMap=\\\"OrderWithProductsRM\\\">\n    SELECT\n      o.id o_id, o.order_no, o.amount,\n      p.id p_id, p.name p_name, p.price, p.category\n    FROM orders o\n    LEFT JOIN order_item oi ON o.id=oi.order_id\n    LEFT JOIN product p ON oi.product_id=p.id\n    WHERE o.id=#{id}\n  \u003C\u002Fselect>\n\n  \u003C!-- insert：主键回填 -->\n  \u003Cinsert id=\\\"insert\\\" parameterType=\\\"Order\\\" useGeneratedKeys=\\\"true\\\" keyProperty=\\\"id\\\">\n    INSERT INTO orders (user_id, order_no, amount, status)\n    VALUES (#{userId}, #{orderNo}, #{amount}, #{status})\n  \u003C\u002Finsert>\n\n  \u003C!-- insert：selectKey 示例（非 MySQL 必要） -->\n  \u003Cinsert id=\\\"insertUseSelectKey\\\" parameterType=\\\"Order\\\">\n    \u003CselectKey keyProperty=\\\"id\\\" resultType=\\\"long\\\" order=\\\"BEFORE\\\">\n      SELECT nextval(\\'order_seq\\')\n    \u003C\u002FselectKey>\n    INSERT INTO orders (id, user_id, order_no, amount, status)\n    VALUES (#{id}, #{userId}, #{orderNo}, #{amount}, #{status})\n  \u003C\u002Finsert>\n\n\u003C\u002Fmapper>\n~~~\n\n# 七、事务实战（Service 层）\n\n```java\n@Service\n@RequiredArgsConstructor\npublic class OrderService {\n  private final OrderMapper orderMapper;\n  private final SqlSessionFactory sqlSessionFactory;\n\n  @Transactional\n  public Long createOrder(Order order, List\u003COrderItem> items) {\n    orderMapper.insert(order); \u002F\u002F 回填 order.id\n    try (SqlSession session = sqlSessionFactory.openSession()) {\n      for (OrderItem it : items) {\n        session.insert(\\\"com.example.demo.mapper.OrderItemMapper.insert\\\", it);\n      }\n      \u002F\u002F 模拟异常可测试回滚\n      \u002F\u002F int x = 1\u002F0;\n    }\n    return order.getId();\n  }\n}\n```\n\n# 八、常见的坑\n\n- **命名参数**：多参数场景务必用 `@Param` 指定名称，与 XML 中占位符一致。\n- **驼峰映射**：开启 `map-underscore-to-camel-case` 或 SQL 中加别名。\n- **N+1**：能用联表就联表，分步查询配合懒加载谨慎使用。\n- **分页**：MySQL 直接 `LIMIT`；生产建议用分页插件（PageHelper \u002F MyBatis-Plus）。\n- **缓存**：二级缓存注意一致性与事务提交时机。\n- **动态 SQL**：优先 `\u003Cwhere>\u002F\u003Cset>\u002F\u003Ctrim>`，避免字符串拼接。\n- **返回 Map**：`resultType=\\\"map\\\"` 可快速做统计类查询。\n- **数据库差异**：`databaseId` + 多语句兼容不同方言。","我在本文中完整演示了MyBatis环境搭建、CRUD操作及XML映射文件的核心用法，涵盖resultMap、动态SQL、主键回填、多表关联与常见坑点，并给出可直接运行的代码示例，帮助读者快速掌握MyBatis开发要点。","这篇文章系统梳理了MyBatis的核心用法，从环境搭建、表结构设计到CRUD、结果映射、动态SQL、缓存及事务，覆盖全面。通过具体XML示例展示了`\u003CresultMap>`的一对多、多对多关联，以及`\u003Cwhere>`、`\u003Cforeach>`等动态标签，并附有常见坑点。内容务实，适合需要快速回顾或上手MyBatis的开发者参考，是一份实用性很强的技术指南。","https:\u002F\u002Fblog.strarry.top\u002Fuploads\u002Fcovers\u002F2026\u002F05\u002Fea8c8718f9b9447c85a89a0baf47aadc.png",127,0,"\u002Fposts\u002Fmybatis-quick-review","2025-08-20 10:29:49","2025-08-30 11:14:46",{"id":170,"name":491,"url":492},"技术教程","\u002Fcategory\u002Fcat-189",[494],{"id":306,"name":495,"url":496},"Mybatis","\u002Ftag\u002Ftag-37",{"title":498,"url":499},"Vue2和Vue3的区别简单总结：后端开发者需要了解的区别","\u002Fposts\u002Fvue2-vs-vue3-comparison",{"title":501,"url":502},"我用Vue3写了一个个人主页","\u002Fposts\u002Fvue3-personal-homepage",{"total_words":504,"total_visitors":505,"total_page_views":506,"online_users":486,"today_visitors":159,"today_pageviews":159,"yesterday_visitors":208,"yesterday_pageviews":222,"month_pageviews":299,"total_articles":204,"total_comments":286,"total_friends":246,"total_moments":170,"total_categories":175,"total_tags":193},"95k",512,2135]