use super::backend::Pg;
use crate::query_builder::QueryBuilder;
use crate::result::QueryResult;
mod distinct_on;
mod limit_offset;
pub(crate) mod on_constraint;
pub(crate) mod only;
mod query_fragment_impls;
pub use self::distinct_on::DistinctOnClause;
#[allow(missing_debug_implementations)]
#[derive(Default)]
#[cfg(feature = "postgres_backend")]
pub struct PgQueryBuilder {
sql: String,
bind_idx: u32,
}
impl PgQueryBuilder {
pub fn new() -> Self {
PgQueryBuilder::default()
}
}
impl QueryBuilder<Pg> for PgQueryBuilder {
fn push_sql(&mut self, sql: &str) {
self.sql.push_str(sql);
}
fn push_identifier(&mut self, identifier: &str) -> QueryResult<()> {
self.push_sql("\"");
self.push_sql(&identifier.replace('"', "\"\""));
self.push_sql("\"");
Ok(())
}
fn push_bind_param(&mut self) {
self.push_bind_param_value_only();
self.sql += "$";
let mut buffer = itoa::Buffer::new();
self.sql += buffer.format(self.bind_idx);
}
fn push_bind_param_value_only(&mut self) {
self.bind_idx += 1;
}
fn finish(self) -> String {
self.sql
}
}
#[test]
fn check_sql_query_increments_bind_count() {
use crate::query_builder::{AstPass, AstPassToSqlOptions, QueryFragment};
use crate::sql_types::*;
let query = crate::sql_query("SELECT $1, $2, $3")
.bind::<Integer, _>(42)
.bind::<Integer, _>(3)
.bind::<Integer, _>(342);
let mut query_builder = PgQueryBuilder::default();
{
let mut options = AstPassToSqlOptions::default();
let ast_pass = AstPass::<crate::pg::Pg>::to_sql(&mut query_builder, &mut options, &Pg);
query.walk_ast(ast_pass).unwrap();
}
assert_eq!(query_builder.bind_idx, 3);
assert_eq!(query_builder.sql, "SELECT $1, $2, $3");
}