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use query::{Filter,Operand};
use query::Query;
use table::Table;
use dao::{Dao};
use database::Database;
use table::IsTable;
use dao::IsDao;
use dao::ToType;
use query::Equality;
/// A higher level API for manipulating objects in the database
pub struct EntityManager<'a>{
pub db:&'a Database,
}
impl <'a>EntityManager<'a>{
/// Create an entity manager with the database connection provided
pub fn new(db:&'a Database)->Self{
EntityManager{db:db}
}
/// create a database table aligned to this table definition
pub fn create_table(&self, table: &Table){
panic!("not yet")
}
/// create a schema or namespace in the database
pub fn create_schema(&self, schema: &str){
panic!("not yet")
}
/// delete records of this table
pub fn delete(&self, table:&Table, filters:&Vec<Filter>)->usize{
let mut query = Query::delete();
for filter in filters{
let f = filter.clone();
query.add_filter(f);
}
match query.execute(self.db){
Ok(x) => x,
Err(e) => panic!("Error deleting record {}",e),
}
}
/// drop the database table
pub fn drop_table(&self, table:&Table){
panic!("not yet")
}
/// drop the database schema
pub fn drop_schema(&self, schema:&str){
panic!("not yet")
}
/// empty the database table
pub fn truncate_table(&self, table:&Table) ->usize{
panic!("not yet")
}
/// determine if the table exist
pub fn exist_table(&self, table:&Table)->bool{
panic!("not yet")
}
/// determine if the schema exist
pub fn exist_schema(&self, schema: &str)->bool{
panic!("not yet")
}
/// get all the records of this table
pub fn get_all<T>(&self)->Vec<T> where T : IsTable + IsDao{
let table = T::table();
let mut q = Query::select();
q.enumerate_table_all_columns(&table);
q.from_table(&table);
q.collect(self.db)
}
/// get all the records of this table, but return only the columns mentioned
pub fn get_all_only_columns<T>(&self, columns:Vec<&str>)->Vec<T>
where T : IsTable + IsDao{
let table = T::table();
let mut q = Query::select();
q.from_table(&table);
q.enumerate_columns(columns);
q.collect(self.db)
}
/// get all the records of this table, ignoring the columns listed, mentioned the other else
pub fn get_all_ignore_columns<T>(&self, ignore_columns:Vec<&str>)->Vec<T>
where T : IsTable + IsDao{
let table = T::table();
let mut q = Query::select();
q.from_table(&table);
q.enumerate_table_all_columns(&table);
q.exclude_columns(ignore_columns);
q.collect(self.db)
}
/// get all the distinct records of this table
pub fn get_all_distinct(&self, table:&Table)->Vec<Dao>{
panic!("not yet")
}
/// get all the records on this table which passed thru the filters
/// any query that specified more than the parameters should use the query api
pub fn get_all_with_filter<T>(&self, table:&Table, filters:Vec<Filter>)->Vec<T>
where T : IsTable + IsDao{
let table = T::table();
let mut q = Query::select();
q.from_table(&table);
q.enumerate_table_all_columns(&table);
for f in filters{
q.add_filter(f);
}
q.collect(self.db)
}
/// get the first records of this table that passed thru the filters
pub fn get_one<T>(&self, filter:Filter)->Vec<T>
where T : IsTable + IsDao{
let table = T::table();
let mut q = Query::select();
q.from_table(&table);
q.enumerate_table_all_columns(&table);
q.add_filter(filter);
q.collect(self.db)
}
///
/// get an exact match, the value is filter against the primary key of the table
/// # Examples
/// ```rust,no_run
/// extern crate rustorm;
/// extern crate uuid;
/// extern crate chrono;
/// extern crate rustc_serialize;
///
/// use rustorm::db::postgres::Postgres;
/// use uuid::Uuid;
///
/// use rustorm::em::EntityManager;
/// use gen::bazaar::Product;
///
/// mod gen;
///
///
/// fn main(){
/// let pg= Postgres::with_connection("postgres://postgres:p0stgr3s@localhost/bazaar_v6");
/// let em = EntityManager::new(&pg);
/// let pid = Uuid::parse_str("6db712e6-cc50-4c3a-8269-451c98ace5ad").unwrap();
/// let prod: Product = em.get_exact(&pid);
/// println!("{} {} {:?}", prod.product_id, prod.name.unwrap(), prod.description);
/// }
/// ```
///
pub fn get_exact<T>(&self, id: &ToType)->T
where T : IsTable + IsDao{
let table = T::table();
let primary = table.primary_columns();
assert!(primary.len() == 1, "There should only be 1 primary column for this to work");
let pk = primary[0].name.to_string();
let mut q = Query::select();
q.from_table(&table);
q.enumerate_table_all_columns(&table);
q.filter(&pk, Equality::EQ, id);
q.collect_one(self.db)
}
/// insert this records to the database, return the inserted dao with
/// values from default columns included
/// # Example
///
/// ```
/// extern crate bazaar;
/// extern crate rustorm;
///
/// use rustorm::em::EntityManager;
/// use rustorm::db::Postgres;
/// use rustorm::dao::Dao;
/// use bazaar::gen::bazaar::Product;
/// fn main(){
/// let pg = Postgres::with_connection("postgres://postgres:p0stgr3s@localhost/bazaar_v6");
/// match pg{
/// Ok(pg) => {
/// let em = EntityManager::new(&pg);
/// let mut dao = Dao::new();
/// dao.set("name", &"inserting 1 records");
/// dao.set("description", &"testing insert 1 record to product");
/// let dao = em.insert(&Product::table(), dao);
/// let prod = Product::from_dao(&dao);
/// println!("created: {}", prod.created);
/// }
/// Err(error) =>{
/// println!("{}",error);
/// }
/// }
/// }
/// ```
pub fn insert<T>(&self, dao:Dao)->T
where T : IsTable + IsDao{
let table = T::table();
let mut q = Query::insert();
q.into_table(&table);
for key in dao.values.keys(){
q.enumerate_column(key);
}
q.enumerate_all_table_column_as_return(&table);
for c in &table.columns{
let value = dao.values.get(&c.name);
match value{
Some(value) => {
q.add_value(Operand::Value(value.clone()));
}
None => (),
};
}
q.collect_one(self.db)
}
/// insert this record on the database, ignoring some columns
/// which are set by the database default
/// columns that are ignored are set by the database automatically
pub fn insert_with_ignore_columns<T>(&self, dao:Dao, ignore_columns:Vec<&str>)->T
where T: IsTable + IsDao {
let table = T::table();
let mut q = Query::insert();
q.into_table(&table);
for key in dao.values.keys(){
q.enumerate_column(key);
}
q.exclude_columns(ignore_columns);
q.enumerate_all_table_column_as_return(&table);
for c in &table.columns{
let value = dao.values.get(&c.name);
match value{
Some(value) => {
q.add_value(Operand::Value(value.clone()));
}
None => (),
};
}
q.collect_one(self.db)
}
/// insert this record on the database, explicitly setting the defaults of the columns
/// it may produce the same result with insert_with_ignore_columns
/// the query is different since it may mentions `created` now(),
pub fn insert_ignore_defaulted_columns<T>(&self, dao:Dao)->T
where T: IsTable + IsDao {
panic!("not yet")
}
/// this is called when there is a problem with the transaction
pub fn reset(&self){
panic!("not yet")
}
/// when there is a problem with the transaction process, this can be called
pub fn rollback(&self){
panic!("not yet")
}
/// update the Dao, return the updated Dao
pub fn update<T>(&self, dao:&Dao)->T
where T: IsTable + IsDao {
panic!("not yet")
}
/// update the Dao, return the updated Dao
/// ignored columns will remain unchanged
pub fn update_ignore_columns<T>(&self, dao:&Dao, ignore_columns:Vec<&str>)->T
where T: IsTable + IsDao {
panic!("not yet")
}
/// update the Dao, return the updated Dao
/// only the columns specified, the rest is unchanged
pub fn update_only_columns<T>(&self, dao:&Dao, columns:Vec<&str>)->T
where T: IsTable + IsDao {
panic!("not yet")
}
/// update the Dao, return the updated Dao
/// the default columns will be reset to whatever the db's default function will come up.
/// ie. updated column will be defaulted everytime a record is updated.
pub fn update_ignore_defaulted_columns<T>(&self, dao:&Dao)->T
where T: IsTable + IsDao {
panic!("not yet")
}
/// update the Dao with filter, return the updated Dao
pub fn update_with_filter<T>(&self, dao:&Dao, filter:Vec<Filter>)->T
where T: IsTable + IsDao {
panic!("not yet")
}
/// whether to use insert or update
/// insert when it is a new record
/// update when it is an existing recor
/// may use UPSERT in newer versions of postgres
/// may use MERGE in oracle, mssql
pub fn save<T>(&self, dao:T)->T where T : IsTable + IsDao{
panic!("not yet");
}
///
/// Search a set of record from the base Query that would have been returned by the base query
///
fn search<T>(&self, keyword:&str)->Vec<T>
where T: IsTable + IsDao {
panic!("not yet");
}
}