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use std::borrow::Cow; use std::fmt; pub use mendes_macros::model; pub struct Table { pub name: Cow<'static, str>, pub columns: Vec<Column>, pub constraints: Vec<Constraint>, } impl fmt::Display for Table { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { write!(fmt, "CREATE TABLE {} (", self.name)?; for (i, col) in self.columns.iter().enumerate() { if i > 0 { write!(fmt, ", ")?; } write!(fmt, "{}", col)?; } for constraint in self.constraints.iter() { write!(fmt, ", {}", constraint)?; } write!(fmt, ")") } } pub struct Column { pub name: Cow<'static, str>, pub ty: Cow<'static, str>, pub null: bool, pub default: Option<Cow<'static, str>>, } impl fmt::Display for Column { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { write!(fmt, "{} {}", self.name, self.ty)?; if !self.null { write!(fmt, " NOT NULL")?; } Ok(()) } } pub enum Constraint { PrimaryKey { name: Cow<'static, str>, columns: Vec<Cow<'static, str>>, }, } impl fmt::Display for Constraint { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { match self { Constraint::PrimaryKey { name, columns } => { write!(fmt, "CONSTRAINT {} PRIMARY KEY (", name)?; for (i, col) in columns.iter().enumerate() { if i > 0 { write!(fmt, ", ")?; } write!(fmt, "{}", col)?; } write!(fmt, ")") } } } } pub struct Serial<T>(T); pub trait Model<S: System> { fn table() -> Table; } pub trait ToColumn<T>: System { fn to_column(name: Cow<'static, str>, params: &[(&str, &str)]) -> Column; } impl ToColumn<Serial<i32>> for PostgreSQL { fn to_column(name: Cow<'static, str>, _: &[(&str, &str)]) -> Column { Column { name, ty: "serial".into(), null: false, default: None, } } } impl ToColumn<i32> for PostgreSQL { fn to_column(name: Cow<'static, str>, _: &[(&str, &str)]) -> Column { Column { name, ty: "integer".into(), null: false, default: None, } } } impl ToColumn<i64> for PostgreSQL { fn to_column(name: Cow<'static, str>, _: &[(&str, &str)]) -> Column { Column { name, ty: "bigint".into(), null: false, default: None, } } } impl ToColumn<String> for PostgreSQL { fn to_column(name: Cow<'static, str>, _: &[(&str, &str)]) -> Column { Column { name, ty: "text".into(), null: false, default: None, } } } #[cfg(feature = "chrono")] impl ToColumn<chrono::NaiveDate> for PostgreSQL { fn to_column(name: Cow<'static, str>, _: &[(&str, &str)]) -> Column { Column { name, ty: "date".into(), null: false, default: None, } } } pub struct PostgreSQL {} impl System for PostgreSQL {} pub trait System: Sized { fn table<M: Model<Self>>() -> Table { M::table() } }