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|
//! Sqlite3 implementation of a generator
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())
};
}
/// We call this struct Sqlite instead of Sqlite3 because we hope not
/// to have to break the API further down the road
pub struct Sqlite;
impl SqlGenerator for Sqlite {
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, new)
}
fn alter_table(name: &str, schema: Option<&str>) -> String {
format!("ALTER TABLE {}\"{}\"", prefix!(schema), name)
}
fn add_column(ex: bool, _: 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!(
// SQL base - default - nullable - unique
"{}{}{}{}{}",
match bt {
Text => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Varchar(_) => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Primary => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Integer => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Float => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Double => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
UUID => panic!("`UUID` not supported by Sqlite3. Use `Text` instead!"),
Json => panic!("`Json` not supported by Sqlite3. Use `Text` instead!"),
Boolean => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Date => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Binary => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Foreign(_, _, _) => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Custom(_) => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(bt)),
Array(it) => format!("{}\"{}\" {}", Sqlite::prefix(ex), name, Sqlite::print_type(Array(Box::new(*it)))),
Index(_) => unreachable!(), // Indices are handled via custom builders
},
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 => "",
}
)
}
/// Create a multi-column index
fn create_index(table: &str, schema: Option<&str>, name: &str, _type: &Type) -> String {
format!(
"CREATE {} INDEX {}\"{}\" ON \"{}\" ({});",
match _type.unique {
true => "UNIQUE",
false => "",
},
prefix!(schema),
name,
table,
match _type.inner {
BaseType::Index(ref cols) => cols
.iter()
.map(|col| format!("\"{}\"", col))
.collect::<Vec<_>>()
.join(", "),
_ => unreachable!(),
}
)
}
/// Drop a multi-column index
fn drop_index(name: &str) -> String {
format!("DROP INDEX \"{}\"", name)
}
fn drop_column(_: &str) -> String {
panic!("Sqlite does not support dropping columns!")
}
fn rename_column(_: &str, _: &str) -> String {
panic!("Sqlite does not support renaming columns!")
}
}
impl Sqlite {
fn prefix(ex: bool) -> String {
match ex {
true => format!("ADD COLUMN "),
false => format!(""),
}
}
fn print_type(t: BaseType) -> String {
use self::BaseType::*;
match t {
Text => format!("TEXT"),
Varchar(l) => match l {
0 => format!("VARCHAR"), // For "0" remove the limit
_ => format!("VARCHAR({})", l),
},
Primary => format!("INTEGER NOT NULL PRIMARY KEY"),
Integer => format!("INTEGER"),
Float => format!("REAL"),
Double => format!("DOUBLE"),
UUID => unimplemented!(),
Boolean => format!("BOOLEAN"),
Date => format!("DATE"),
Json => panic!("Json is not supported by Sqlite3"),
Binary => format!("BINARY"),
Foreign(_, t, refs) => format!("INTEGER REFERENCES {}({})", t, refs.0.join(",")),
Custom(t) => format!("{}", t),
Array(meh) => format!("{}[]", Sqlite::print_type(*meh)),
Index(_) => unimplemented!(),
}
}
}
|
