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use rusqlite;
use std::collections::HashMap;
/// Get the fundamental SQLite datatype for a given type name.
///
/// Use the SQLite rules for type affinity described in:
/// https://sqlite.org/datatype3.html#determination_of_column_affinity
pub fn affinity(type_name: &str) -> rusqlite::types::Type {
use rusqlite::types::Type;
let type_name = type_name.to_uppercase();
if type_name.contains("INT") {
return Type::Integer;
} else if type_name.contains("CHAR")
|| type_name.contains("CLOB")
|| type_name.contains("TEXT")
{
return Type::Text;
} else if type_name.contains("BLOB")
|| type_name.is_empty()
{
return Type::Blob;
} else if type_name.contains("REAL")
|| type_name.contains("FLOA")
|| type_name.contains("DOUB")
{
return Type::Real;
}
// TODO: Numeric affinity
Type::Text
}
#[derive(Debug)]
pub struct Zero;
pub fn get_column_names(
dbconn: &rusqlite::Connection,
table_name: &str,
) -> Result<HashMap<String, Zero>, crate::Error> {
let mut column_names = HashMap::new();
let mut stmt = dbconn.prepare(
&format!(
r#"
SELECT "name"
FROM pragma_table_info("{}");
"#,
table_name,
),
)?;
let rows = stmt.query_map(
[],
|row| row.get(0),
)?;
for row_result in rows {
let row = row_result?;
column_names.insert(row, Zero{});
}
Ok(column_names)
}
/// Get the name of the given table's primary key.
pub fn table_primary_key_column(
dbconn: &rusqlite::Connection,
table_name: &str,
) -> Result<String, crate::Error> {
let mut stmt = dbconn.prepare(r#"
SELECT "name"
FROM pragma_table_info(:table)
WHERE "pk" != 0;'
"#)?;
let pk_column: String = stmt.query_row(
&[(":table", table_name)],
|row| row.get(0),
)?;
Ok(pk_column)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn table_primary_key_column_gets_primary_key_name() {
let conn = rusqlite::Connection::open_in_memory().unwrap();
conn.execute(
r#"
CREATE TABLE "test" (
id INTEGER PRIMARY KEY,
count INTEGER
);
"#,
[]
).unwrap();
let column_name = table_primary_key_column(&conn, "test").unwrap();
assert_eq!("id", column_name);
conn.close().unwrap();
}
}
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