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//! Postgres implementation of a generator
//!
//! This module generates strings that are specific to Postgres
//! databases. They should be thoroughly tested via unit testing
use super::SqlGenerator;
use crate::types::{BaseType, Type};
/// A simple macro that will generate a schema prefix if it exists
macro_rules! prefix {
($schema:expr) => {
$schema
.map(|s| format!("\"{}\".", s))
.unwrap_or_else(|| String::new())
};
}
/// Postgres SQL generator backend
pub struct Pg;
impl SqlGenerator for Pg {
fn create_table(name: &str, schema: Option<&str>) -> String {
format!("CREATE TABLE {}\"{}\"", prefix!(schema), name)
}
fn create_table_if_not_exists(name: &str, schema: Option<&str>) -> String {
format!("CREATE TABLE IF NOT EXISTS {}\"{}\"", prefix!(schema), name)
}
fn drop_table(name: &str, schema: Option<&str>) -> String {
format!("DROP TABLE {}\"{}\"", prefix!(schema), name)
}
fn drop_table_if_exists(name: &str, schema: Option<&str>) -> String {
format!("DROP TABLE IF EXISTS {}\"{}\"", prefix!(schema), name)
}
fn rename_table(old: &str, new: &str, schema: Option<&str>) -> String {
let schema = prefix!(schema);
format!(
"ALTER TABLE {}\"{}\" RENAME TO {}\"{}\"",
schema, old, schema, new
)
}
fn alter_table(name: &str, schema: Option<&str>) -> String {
format!("ALTER TABLE {}\"{}\"", prefix!(schema), name)
}
fn add_column(ex: bool, schema: Option<&str>, name: &str, tt: &Type) -> String {
let bt: BaseType = tt.get_inner();
use self::BaseType::*;
#[cfg_attr(rustfmt, rustfmt_skip)] /* This shouldn't be formatted. It's too long */
format!(
"{}{}{}{}{}",
match bt {
Text => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Varchar(_) => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Primary => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Integer => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Float => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Double => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
UUID => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Json => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Boolean => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Date => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Binary => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Foreign(_, _, _) => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Custom(_) => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(bt, schema)),
Array(it) => format!("{}\"{}\" {}", Pg::prefix(ex), name, Pg::print_type(Array(Box::new(*it)), schema)),
Index(_) => unreachable!(), // Indices are handled via custom builder
},
match tt.primary {
true => " PRIMARY KEY",
false => "",
},
match (&tt.default).as_ref() {
Some(ref m) => format!(" DEFAULT '{}'", m),
_ => format!(""),
},
match tt.nullable {
true => "",
false => " NOT NULL",
},
match tt.unique {
true => " UNIQUE",
false => "",
},
)
}
fn drop_column(name: &str) -> String {
format!("DROP COLUMN \"{}\"", name)
}
fn rename_column(old: &str, new: &str) -> String {
format!("ALTER COLUMN \"{}\" RENAME TO \"{}\"", old, new)
}
fn create_index(table: &str, schema: Option<&str>, name: &str, _type: &Type) -> String {
// FIXME: Implement PG specific index builder here
format!(
"CREATE {} INDEX \"{}\" ON {}\"{}\" ({})",
match _type.unique {
true => "UNIQUE",
false => "",
},
name,
prefix!(schema),
table,
match _type.inner {
BaseType::Index(ref cols) => cols
.iter()
.map(|col| format!("\"{}\"", col))
.collect::<Vec<_>>()
.join(", "),
_ => unreachable!(),
}
)
}
fn drop_index(name: &str) -> String {
format!("DROP INDEX \"{}\"", name)
}
}
impl Pg {
fn prefix(ex: bool) -> String {
match ex {
true => format!("ADD COLUMN "),
false => format!(""),
}
}
fn print_type(t: BaseType, schema: Option<&str>) -> String {
use self::BaseType::*;
match t {
Text => format!("TEXT"),
Varchar(l) => match l {
0 => format!("VARCHAR"), // For "0" remove the limit
_ => format!("VARCHAR({})", l),
},
/* "NOT NULL" is added here because normally primary keys are implicitly not-null */
Primary => format!("SERIAL PRIMARY KEY NOT NULL"),
Integer => format!("INTEGER"),
Float => format!("FLOAT"),
Double => format!("DOUBLE PRECISION"),
UUID => format!("UUID"),
Boolean => format!("BOOLEAN"),
Date => format!("DATE"),
Json => format!("JSON"),
Binary => format!("BYTEA"),
Foreign(s, t, refs) => format!(
"INTEGER REFERENCES {}\"{}\"({})",
prefix!(s.or(schema.map(|s| s.into()))),
t,
refs.0.join(",")
),
Custom(t) => format!("{}", t),
Array(meh) => format!("{}[]", Pg::print_type(*meh, schema)),
Index(_) => unreachable!(), // Indices are handled via custom builder
}
}
}
|
