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#![allow(dead_code)]
extern crate postgres;
extern crate r2d2;
extern crate r2d2_postgres;
extern crate rustc_serialize;
#[macro_use] extern crate lazy_static;
#[macro_use] extern crate log;
use std::sync::RwLock;
use postgres::rows::Row;
use postgres::types::{ToSql, FromSql};
use r2d2::{Config, Pool, PooledConnection};
use r2d2_postgres::{PostgresConnectionManager, SslMode};
pub trait Entity {
fn convert(row: Row) -> Self;
fn get(_: i32) -> Option<Self> where Self: Sized { unimplemented!(); }
fn count() -> i32 { unimplemented!(); }
fn list() -> Vec<Self> where Self: Sized { unimplemented!(); }
fn page_list(_: i32, _: i32, _:&str) -> Vec<Self> where Self: Sized { unimplemented!(); }
fn delete(_: i32) -> bool { unimplemented!(); }
fn new(&self) -> bool { unimplemented!(); }
fn update(&self) -> bool { unimplemented!(); }
}
impl<T: FromSql> Entity for T {
fn convert(row: Row) -> Self {
row.get(0)
}
}
#[macro_export]
macro_rules! reposable {
(struct $name:ident($table_name:ident) {
$($field_name:ident: $field_type:ty,)*
}) => {
#[derive(Default,Debug,RustcEncodable, RustcDecodable,Clone, PartialEq,Eq)]
pub struct $name {
pub id: i32,
$(pub $field_name: $field_type,)*
}
impl Entity for $name{
fn convert(row: ::postgres::rows::Row)->Self{
let mut m=$name::default();
m.id=row.get("id");
$(m.$field_name=row.get(stringify!($field_name));)*
m
}
fn get(id: i32) -> Option<Self> {
let sql=format!("select * from {} where id={}",stringify!($table_name),id );
find_one(&sql,&[])
}
fn delete(id: i32) -> bool {
let sql=format!("delete from {} where id={}",stringify!($table_name),id );
execute(&sql,&[])>0
}
fn new(&self) -> bool {
let fields=vec![$(stringify!($field_name)),*];
let values: &[&::postgres::types::ToSql]= &[$(&self.$field_name),*];
let params =(0..fields.len()).map(|i| format!("${}",i+1)).collect::<Vec<String>>().join(",");
let sql=format!("insert into {} ({}) values ({})",stringify!($table_name),fields.join(","),params);
execute(&sql,values)>0
}
fn update(&self) -> bool {
let fields=vec![$(stringify!($field_name)),*];
let values: &[&::postgres::types::ToSql]= &[$(&self.$field_name),*];
let params=fields.iter().enumerate().map(|(i,name)| format!("{}=${}",name,i+1)).collect::<Vec<String>>().join(",");
let sql=format!("update {} set {} where id={}",stringify!($table_name),params,&self.id);
execute(&sql,values)>0
}
fn list()->Vec<Self>{
let sql=format!("select * from {} order by id",stringify!($table_name));
find_list(&sql,&[])
}
fn page_list(page_size: i32, page_num: i32,order_field: &str) -> Vec<Self>{
let mut order_field=String::from(order_field.trim());
let mut desc=String::new();
if order_field.starts_with("-") {
desc.push_str("desc");
order_field=order_field.trim_left_matches('-').into();
}
let sql = format!("select * from {} order by {} {} limit {} offset {}",stringify!($table_name),order_field, desc, page_size, page_num * page_size);
find_list(&sql,&[])
}
fn count() -> i32 {
let sql=format!("select count(1) from {}",stringify!($table_name));
find_one::<i64>(&sql,&[]).unwrap_or(0) as i32
}
}
}
}
pub struct PostgresConfig {
pub host: String,
pub port: String,
pub user_name: String,
pub password: String,
pub db_name: String,
}
lazy_static! {
static ref POSTGRES_POOL: RwLock<Option<Pool<PostgresConnectionManager>>> = RwLock::new(None);
}
pub fn init(c: &PostgresConfig) {
let connect_str = format!("postgres://{}:{}@{}:{}/{}", c.user_name, c.password, c.host, c.port, c.db_name);
info!("Connecting to postgres:{}", connect_str);
let manager = PostgresConnectionManager::new(connect_str.as_str(), SslMode::None).unwrap();
let config = Config::builder().pool_size(10).build();
match Pool::new(config, manager) {
Ok(pool) => {
info!("Connected to postgres with pool: {:?}", pool);
let mut w = POSTGRES_POOL.write().unwrap();
*w = Some(pool);
}
Err(err) => {
panic!("error occurs when connect to postgres {}.Error info:{}", connect_str, err);
}
};
}
fn get_conn() -> PooledConnection<PostgresConnectionManager> {
match *POSTGRES_POOL.read().unwrap() {
Some(ref pool) => {
match pool.get() {
Ok(conn) => conn,
Err(err) => panic!("error in get_conn():{}", err),
}
},
None => panic!("repository not initialized"),
}
}
pub fn find_one<T: Entity>(query: &str, params: &[&ToSql]) -> Option<T> {
info!("find_one: {}, params:{:?}", query, params);
let conn = get_conn();
match conn.query(query, params) {
Ok(rows) => {
return rows.into_iter().next().map(T::convert);
}
Err(err) => {
panic!("error occur when execute query:{},params:{:?},error:{}", query, params, err)
}
}
None
}
pub fn find_list<T: Entity>(query: &str, params: &[&ToSql]) -> Vec<T> {
info!("find_list: {}, params:{:?}", query, params);
let conn = get_conn();
match conn.query(query, params) {
Ok(rows) => {
return rows.into_iter().map(T::convert).collect();
}
Err(err) => {
panic!("error occur when execute query:{},params:{:?},error:{}", query, params, err)
}
}
vec![]
}
pub fn execute(query: &str, params: &[&ToSql]) -> u64 {
info!("execute :{}, params:{:?}", query, params);
let conn = get_conn();
match conn.execute(query, params) {
Ok(count) => count,
Err(err) => panic!("error occur when execute query:{},params:{:?},error:{}", query, params, err),
}
}
pub fn batch_execute(query: &str) -> postgres::Result<()> {
info!("batch_execute :{}", query);
let conn = get_conn();
conn.batch_execute(query)
}