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use super::table::{Table, TableMeta};
use super::{DatabaseChange, Type};
use super::backend::SqlGenerator;
use super::connectors::DatabaseExecutor;
use std::rc::Rc;
pub struct Migration {
schema: String,
changes: Vec<DatabaseChange>,
}
impl Migration {
pub fn new() -> Migration {
return Migration {
schema: String::new(),
changes: Vec::new(),
};
}
pub fn schema<S: Into<String>>(mut self, schema: S) -> Migration {
self.schema = schema.into();
return self;
}
pub fn make<T: SqlGenerator>(&self) -> String {
use DatabaseChange::*;
let mut s = String::new();
let mut changes = self.changes.clone();
for change in &mut changes {
match change {
&mut CreateTable(ref mut t, ref mut cb) => {
if t.meta.has_id {
t.add_column("id", Type::Primary).increments();
}
cb(t);
let vec = t.make::<T>(false);
s.push_str(&T::create_table(&t.meta.name()));
s.push_str(" (");
let l = vec.len();
for (i, slice) in vec.iter().enumerate() {
s.push_str(slice);
if i < l - 1 {
s.push_str(", ");
}
}
s.push_str(")");
}
&mut DropTable(ref name) => s.push_str(&T::drop_table(name)),
&mut DropTableIfExists(ref name) => s.push_str(&T::drop_table_if_exists(name)),
&mut RenameTable(ref old, ref new) => s.push_str(&T::rename_table(old, new)),
_ => {}
}
}
return s;
}
pub fn revert<T: SqlGenerator>(&self) -> String {
unimplemented!()
}
pub fn execute<T: DatabaseExecutor, S: SqlGenerator>(&self, runner: &mut T) {
runner.execute(self.make::<S>());
}
pub fn create_table<S: Into<String>, F: 'static>(&mut self, name: S, cb: F) -> &mut TableMeta
where
F: Fn(&mut Table),
{
self.changes
.push(DatabaseChange::CreateTable(Table::new(name), Rc::new(cb)));
return match self.changes.last_mut().unwrap() {
&mut DatabaseChange::CreateTable(ref mut t, _) => &mut t.meta,
_ => unreachable!(),
};
}
pub fn create_table_if_not_exists<S: Into<String>, F: 'static>(
&mut self,
name: S,
cb: F,
) -> &mut TableMeta
where
F: Fn(&mut Table),
{
self.changes.push(DatabaseChange::CreateTableIfNotExists(
Table::new(name),
Rc::new(cb),
));
return match self.changes.last_mut().unwrap() {
&mut DatabaseChange::CreateTable(ref mut t, _) => &mut t.meta,
_ => unreachable!(),
};
}
pub fn change_table<S: Into<String>, F: 'static>(&mut self, name: S, cb: F)
where
F: Fn(&mut Table),
{
let t = Table::new(name);
let c = DatabaseChange::ChangeTable(t, Rc::new(cb));
self.changes.push(c);
}
pub fn rename_table<S: Into<String>>(&mut self, old: S, new: S) {
self.changes
.push(DatabaseChange::RenameTable(old.into(), new.into()));
}
pub fn drop_table<S: Into<String>>(&mut self, name: S) {
self.changes.push(DatabaseChange::DropTable(name.into()));
}
pub fn drop_table_if_exists<S: Into<String>>(&mut self, name: S) {
self.changes
.push(DatabaseChange::DropTableIfExists(name.into()));
}
}