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doc: 增加select*说明

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robor.luo 2024-01-26 13:04:02 +08:00
parent 179032ecec
commit d59bb223df
1 changed files with 14 additions and 10 deletions
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24
docs/zh/base/querywrapper.md
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@ -53,17 +53,21 @@ MyBatis-Flex 使用了 APT 技术，这个 `ACCOUNT` 是自动生成的。
:::
## select *
```java
QueryWrapper query = new QueryWrapper();
query.select(ACCOUNT.ID, ACCOUNT.USER_NAME)
.from(ACCOUNT)
QueryWrapper query1 = new QueryWrapper();
query1.select(ACCOUNT.ID, ACCOUNT.USER_NAME)
.from(ACCOUNT);
QueryWrapper query2 = new QueryWrapper();
query2.select().from(ACCOUNT);
```
其查询生成的 Sql 如下：
```sql
SELECT id, user_name FROM tb_account
SELECT id, user_name FROM tb_account;
SELECT * FROM tb_account;
```
## select ... as
@ -112,12 +116,12 @@ WHERE a.id = b.account_id
示例 ：
```java
QueryWrapper query=new QueryWrapper()
QueryWrapper query = new QueryWrapper()
.select(
ACCOUNT.ID,
ACCOUNT.USER_NAME,
max(ACCOUNT.BIRTHDAY),
avg(ACCOUNT.SEX).as("sex_avg")
ACCOUNT.ID,
ACCOUNT.USER_NAME,
max(ACCOUNT.BIRTHDAY),
avg(ACCOUNT.SEX).as("sex_avg")
).from(ACCOUNT);
```