在 Rnotebook 中为 SQL 块设置全局数据库连接

Question

有没有办法在 Rnotebook 中设置全局数据库连接，这样您就不必为每个 SQL 块设置数据库连接？

目前我必须为每个SQL块设置如下：

```{sql connection = my_connection}
select * from my_table
```

我希望能够做到以下几点：

```{sql}
select * from my_table
```

Answer 1

来自Rmarkdown docs：

Setting a Default Connection

If you have many SQL chunks, it may be helpful to set a default for the connection chunk option in the setup chunk, so that it is not necessary to specify the connection on each individual chunk. You can do this as follows:
```{r setup}
library(DBI)
db <- dbConnect(RSQLite::SQLite(), dbname = "sql.sqlite")
knitr::opts_chunk$set(connection = "db")
```

因此，在您的示例中，设置一个挂钩

```{r setup}
# insert your my_connection declaration here
knitr::opts_chunk$set(connection = "my_connection")
```

并将该块放在所有其他块之前。

在 Rnotebook 中为 SQL 块设置全局数据库连接

Set Global Database Connection for SQL chunk in Rnotebook

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