xuewuerduo
f468d532b1
包含以下模块： - antdv-next-admin: Vue 3 + TypeScript + Ant Design Vue 管理后台 - 设备/许可证/配件/耗材 CRUD 管理页面 - 基础数据管理 (分类/位置/制造商/型号/供应商) - 业务管理 (故障报修/盘点/资产分配/资产申请/交易记录) - 下拉选项改造 (ID输入框 → 搜索下拉选择) - 资产状态字典化 (接入sys_dict系统) - 界面文案优化 (设备→资产, 在库/在用/维修中/已报废) - 修复 console 警告 (popupClassName, 重复组件注册) - our-itam: Java Spring Boot + magic-api 后端服务 - fantastic-admin: 前端底层框架 (pnpm monorepo) - ciyo-itasset: CIYO 资产模块 - magic-script-skill: Claude Code skill 定义 - .claude: 对话历史记录 Co-Authored-By: Claude Code <noreply@anthropic.com>
126 lines
2.3 KiB
Markdown
126 lines
2.3 KiB
Markdown
# 增删改查
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## SQL参数
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### #{} 注入参数
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作用和`mybatis`一致，都是将`#{}`区域替换为占位符`?`
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```javascript
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var id = 123;
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return db.select("""
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select * from sys_user where id = #{id}
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""");
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// 运行时生成的SQL为：select * from sys_user where id = ?
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```
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### ${} 拼接参数
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作用和`mybatis`一致，都是将`${}`区域替换为对应的字符串
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```javascript
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var id = 123;
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return db.select("""
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select * from sys_user where id = ${id}
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""");
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// 运行时生成的SQL为：select * from sys_user where id = 123
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```
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## 动态SQL参数
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通过`?{condition,expression}`来实现动态拼接`SQL`
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```javascript
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return db.select("select * from sys_user ?{id,where id = #{id}}");
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// 当id有值时,生成SQL：select * from sys_user where id = ?
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// 当id无值时,生成SQL：select * from sys_user
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```
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## 切换数据源
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```javascript
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// 从数据源key定义为slave的库中查询
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return db.slave.select("""
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select * from sys_user
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""")
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```
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## SQL缓存
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```javascript
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// 将查询结果缓存到名为user_cache的缓存中，有效期1小时
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return db.cache("user_cache", 3600 * 1000).select("""
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select * from sys_user
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""")
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```
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## 使用事务
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### 自动事务
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```javascript
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var val = db.transaction(()=>{
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var v1 = db.update('...');
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var v2 = db.update('....');
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return v2;
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});
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return val;
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```
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### 手动事务
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```javascript
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var tx = db.transaction(); //开启事务
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try{
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var value = db.update('...');
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tx.commit(); // 提交事务
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return value;
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}catch(e){
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tx.rollback(); // 回滚事务
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}
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```
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## Mybatis语法支持
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### if
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```javascript
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var sql = """
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select * from test_data
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where 1 = 1
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<if test="id != null">
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and id = #{id}
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</if>
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"""
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return db.select(sql)
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```
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### where
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```javascript
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var sql = """
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select * from test_data
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<where>
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<if test="id != null">
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and id = #{id}
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</if>
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</where>
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"""
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return db.select(sql)
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```
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### set、trim
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```javascript
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var sql = """
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update test_data
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<set>
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<if test="name != null">
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name = #{name}
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</if>
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</set>
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where `id` = #{id}
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"""
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return db.update(sql)
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```
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### foreach
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```javascript
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var sql = """
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select * from test_data
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where id in
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<foreach item='item' index='index' collection='body.ids'
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open="(" separator="," close=")">
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#{item}
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</foreach>
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"""
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return db.select(sql)
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```
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