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|
use rusqlite;
use yaml_rust::yaml;
use std::collections::HashSet;
mod sql;
mod write;
pub(crate) use sql::*;
pub use write::*;
// TODO: Separate functions to get a list of YAML hashes, and insert hashes into
// the database.
pub fn extract(
doc: &mut yaml::Yaml,
tx: &rusqlite::Transaction,
table_name: &str,
table_columns: &HashSet<String>,
) -> Result<(), crate::Error> {
match doc {
yaml::Yaml::Array(ref mut array) => {
for yaml_value in array {
extract(yaml_value, tx, table_name, table_columns)?;
}
}
yaml::Yaml::Hash(ref mut hash) => {
use std::borrow::Cow;
let keys: Vec<yaml::Yaml> = hash.keys().map(|k| k.clone()).collect();
let columns_as_yaml: Vec<yaml::Yaml> = table_columns.iter()
.map(|c| yaml::Yaml::from_str(c))
.collect();
for key in keys.iter() {
if !columns_as_yaml.contains(key) {
hash.remove(key);
}
}
let mut stmt = tx.prepare(
&format!(
r#"
INSERT INTO "{}"
({})
VALUES
({});
"#,
table_name,
// Wrap column names in quotes.
hash.keys()
.map(|k| k.as_str())
.filter(|k| k.is_some())
// Always `Some`.
.map(|k| format!(r#""{}""#, k.unwrap()))
.collect::<Vec<String>>()
.join(", "),
format!("{}?", "?, ".repeat(hash.len() - 1)),
)
)?;
let values = hash.values().map(|v| Yaml(Cow::Borrowed(v)));
stmt.insert(rusqlite::params_from_iter(values))?;
}
_ => {}
}
Ok(())
}
|
