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Fix sqlite example formatting and add syntax highlighting (#533)

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* Fix sqlite example formatting and add syntax highlighting

* Format sqlite insert_select example using rustfmt

* Improve sqlite example code readability while adhering to rustfmt
This commit is contained in:
Rasmus Ansin 2020-01-16 00:16:38 +01:00 committed by Andrew Gauger
parent a38c7cb59f
commit dddb1a9fa5
1 changed files with 25 additions and 27 deletions
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52
src/database/sqlite/insert_select.md
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@ -5,61 +5,59 @@
[`Connection::open`] will open the database `cats` created in the earlier recipe.
This recipe inserts data into `cat_colors` and `cats` tables using the [`execute`] method of `Connection`. First, the data is inserted into the `cat_colors` table. After a record for a color is inserted, [`last_insert_rowid`] method of `Connection` is used to get `id` of the last color inserted. This `id` is used while inserting data into the `cats` table. Then, the select query is prepared using the [`prepare`] method which gives a [`statement`] struct. Then, query is executed using [`query_map`] method of [`statement`].
```
```rust,no_run
extern crate rusqlite;
use rusqlite::{Connection, Result};
use rusqlite::NO_PARAMS;
use rusqlite::{Connection, Result};
use std::collections::HashMap;
#[derive(Debug)]
struct Cat {
name: String,
color: String
color: String,
}
fn main() -> Result<()> {
fn main() -> Result<()> {
let conn = Connection::open("cats.db")?;
let mut cat_colors = HashMap::new();
cat_colors.insert(String::from("Blue"), vec!["Tigger", "Sammy"]);
cat_colors.insert(String::from("Black"), vec!["Oreo", "Biscuit"]);
for (color, catnames) in &cat_colors{
for (color, catnames) in &cat_colors {
conn.execute(
"INSERT INTO cat_colors (name) values (?1)",
&[&color.to_string()],
)?;
let last_id : String = conn.last_insert_rowid().to_string();
let last_id: String = conn.last_insert_rowid().to_string();
for cat in catnames{
conn.execute(
"INSERT INTO cats (name, color_id) values (?1, ?2)",
&[&cat.to_string(), &last_id],
)?;
for cat in catnames {
conn.execute(
"INSERT INTO cats (name, color_id) values (?1, ?2)",
&[&cat.to_string(), &last_id],
)?;
}
}
let mut stmt = conn.prepare("SELECT c.name, cc.name from cats c
INNER JOIN cat_colors cc ON cc.id = c.color_id;")?;
let cats = stmt
.query_map(NO_PARAMS, |row|
Ok(
Cat {
name: row.get(0)?,
color: row.get(1)?,
}
)
)?;
let mut stmt = conn.prepare(
"SELECT c.name, cc.name from cats c
INNER JOIN cat_colors cc
ON cc.id = c.color_id;",
)?;
let cats = stmt.query_map(NO_PARAMS, |row| {
Ok(Cat {
name: row.get(0)?,
color: row.get(1)?,
})
})?;
for cat in cats {
println!("Found cat {:?}", cat);
}
Ok(())
}
```
[`Connection::open`]: https://docs.rs/rusqlite/*/rusqlite/struct.Connection.html#method.open