68 lines
1.6 KiB
Rust
68 lines
1.6 KiB
Rust
use crate::StdResult;
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pub trait ToSql {
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fn to_sql(&self) -> String;
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}
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pub type ToSqlParams<'a> = &'a [&'a dyn ToSql];
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impl ToSql for &str {
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fn to_sql(&self) -> String {
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format!("'{}'", self)
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}
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}
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pub trait TryFromSql<QueryResultRow>: Sized {
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fn try_from_sql(row: QueryResultRow) -> StdResult<Self>;
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}
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pub trait OpenDatabaseConnection: Sized {
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fn open(connection_string: &str) -> StdResult<Self>;
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}
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pub trait DatabaseConnection {
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fn batch_execute(&mut self, query: &str) -> StdResult<()>;
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fn execute<'b>(&mut self, query: &str, params: ToSqlParams<'b>) -> StdResult<u64>;
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fn query<'b>(&mut self, query: &str, params: ToSqlParams<'b>) -> StdResult<Vec<Vec<String>>>;
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}
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pub(crate) fn merge_query_with_params(query: &str, params: ToSqlParams) -> String {
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params
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.iter()
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.enumerate()
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.fold(query.to_string(), |acc, (i, p)| {
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str::replace(&acc, &format!("${}", i + 1), &p.to_sql())
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn replace_one_param_in_query() {
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assert_eq!(
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merge_query_with_params("SELECT $1", &[&"foo"]),
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"SELECT 'foo'"
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);
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}
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#[test]
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fn replace_two_params_in_query() {
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assert_eq!(
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merge_query_with_params("SELECT $1, $2", &[&"foo", &"bar"]),
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"SELECT 'foo', 'bar'"
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);
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}
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#[test]
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fn replace_all_bonds_in_query_with_first_param() {
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assert_eq!(
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merge_query_with_params("SELECT $1, $1", &[&"foo"]),
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"SELECT 'foo', 'foo'"
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);
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}
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}
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