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Updatiing translation chapter so it fulfill requirements of dbplyr latest version #1787

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Updatiing translation chapter so it fulfill requirements of dbplyr latest version #1787

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11 changes: 7 additions & 4 deletions Translation.Rmd
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Original file line number Diff line number Diff line change
Expand Up @@ -11,10 +11,13 @@ The combination of first-class environments, lexical scoping, and metaprogrammin

```{r}
library(dbplyr)
translate_sql(x ^ 2)
translate_sql(x < 5 & !is.na(x))
translate_sql(!first %in% c("John", "Roger", "Robert"))
translate_sql(select == 7)

con <- simulate_dbi()

translate_sql(x ^ 2, con = con)
translate_sql(x < 5 & !is.na(x), con = con)
translate_sql(!first %in% c("John", "Roger", "Robert"), con = con)
translate_sql(select == 7, con = con)
```

Translating R to SQL is complex because of the many idiosyncrasies of SQL dialects, so here I'll develop two simple, but useful, domain specific languages (DSL): one to generate HTML, and the other to generate mathematical equations in LaTeX.
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