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use std::borrow::Cow;
use futures_util::io::{AsyncRead, AsyncWrite};
use crate::{
tds::{codec::RpcProcId, stream::TokenStream},
Client, ColumnData, ExecuteResult, IntoSql, QueryStream,
};
/// A query object with bind parameters.
#[derive(Debug)]
pub struct Query<'a> {
sql: Cow<'a, str>,
params: Vec<ColumnData<'a>>,
}
impl<'a> Query<'a> {
/// Construct a new query object with the given SQL. If the SQL is
/// parameterized, the given number of parameters must be bound to the
/// object before executing.
///
/// The `sql` can define the parameter placement by annotating them with
/// `@PN`, where N is the index of the parameter, starting from `1`.
pub fn new(sql: impl Into<Cow<'a, str>>) -> Self {
Self {
sql: sql.into(),
params: Vec::new(),
}
}
/// Bind a new parameter to the query. Must be called exactly as many times
/// as there are parameters in the given SQL. Otherwise the query will fail
/// on execution.
pub fn bind(&mut self, param: impl IntoSql<'a> + 'a) {
self.params.push(param.into_sql());
}
/// Executes SQL statements in the SQL Server, returning the number rows
/// affected. Useful for `INSERT`, `UPDATE` and `DELETE` statements. See
/// [`Client#execute`] for a simpler API if the parameters are statically
/// known.
///
/// # Example
///
/// ```no_run
/// # use tiberius::{Config, Query};
/// # use tokio_util::compat::TokioAsyncWriteCompatExt;
/// # use std::env;
/// # #[tokio::main]
/// # async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// # let c_str = env::var("TIBERIUS_TEST_CONNECTION_STRING").unwrap_or(
/// # "server=tcp:localhost,1433;integratedSecurity=true;TrustServerCertificate=true".to_owned(),
/// # );
/// # let config = Config::from_ado_string(&c_str)?;
/// # let tcp = tokio::net::TcpStream::connect(config.get_addr()).await?;
/// # tcp.set_nodelay(true)?;
/// # let mut client = tiberius::Client::connect(config, tcp.compat_write()).await?;
/// let mut query = Query::new("INSERT INTO ##Test (id) VALUES (@P1), (@P2), (@P3)");
///
/// query.bind("foo");
/// query.bind(2i32);
/// query.bind(String::from("bar"));
///
/// let results = query.execute(&mut client).await?;
/// # Ok(())
/// # }
/// ```
///
/// [`ToSql`]: trait.ToSql.html
/// [`FromSql`]: trait.FromSql.html
/// [`Client#execute`]: struct.Client.html#method.execute
pub async fn execute<'b, S>(self, client: &'b mut Client<S>) -> crate::Result<ExecuteResult>
where
S: AsyncRead + AsyncWrite + Unpin + Send,
{
client.connection.flush_stream().await?;
let rpc_params = Client::<S>::rpc_params(self.sql);
client
.rpc_perform_query(RpcProcId::ExecuteSQL, rpc_params, self.params.into_iter())
.await?;
ExecuteResult::new(&mut client.connection).await
}
/// Executes SQL statements in the SQL Server, returning resulting rows.
/// Useful for `SELECT` statements. See [`Client#query`] for a simpler API
/// if the parameters are statically known.
///
/// # Example
///
/// ```
/// # use tiberius::{Config, Query};
/// # use tokio_util::compat::TokioAsyncWriteCompatExt;
/// # use std::env;
/// # #[tokio::main]
/// # async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// # let c_str = env::var("TIBERIUS_TEST_CONNECTION_STRING").unwrap_or(
/// # "server=tcp:localhost,1433;integratedSecurity=true;TrustServerCertificate=true".to_owned(),
/// # );
/// # let config = Config::from_ado_string(&c_str)?;
/// # let tcp = tokio::net::TcpStream::connect(config.get_addr()).await?;
/// # tcp.set_nodelay(true)?;
/// # let mut client = tiberius::Client::connect(config, tcp.compat_write()).await?;
/// let mut query = Query::new("SELECT @P1, @P2, @P3");
///
/// query.bind(1i32);
/// query.bind(2i32);
/// query.bind(3i32);
///
/// let stream = query.query(&mut client).await?;
/// # Ok(())
/// # }
/// ```
///
/// [`QueryStream`]: struct.QueryStream.html
/// [`ToSql`]: trait.ToSql.html
/// [`FromSql`]: trait.FromSql.html
/// [`Client#query`]: struct.Client.html#method.query
pub async fn query<'b, S>(self, client: &'b mut Client<S>) -> crate::Result<QueryStream<'b>>
where
S: AsyncRead + AsyncWrite + Unpin + Send,
{
client.connection.flush_stream().await?;
let rpc_params = Client::<S>::rpc_params(self.sql);
client
.rpc_perform_query(RpcProcId::ExecuteSQL, rpc_params, self.params.into_iter())
.await?;
let ts = TokenStream::new(&mut client.connection);
let mut result = QueryStream::new(ts.try_unfold());
result.forward_to_metadata().await?;
Ok(result)
}
}