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#[derive(Clone, Debug, PartialEq)]
pub struct FieldAttribute {
pub size: Option<i32>,
pub unique: Option<bool>,
pub not_null: Option<bool>,
}
impl Default for FieldAttribute {
fn default() -> Self {
FieldAttribute {
size: None,
unique: None,
not_null: None,
}
}
}
pub fn create_column_query(
column_name: String,
column_type: String,
attr: FieldAttribute,
) -> String {
[
&[column_name.as_str(), column_type.as_str()],
vec![
if attr.unique.unwrap_or(false) {
Some("UNIQUE")
} else {
None
},
if attr.not_null.unwrap_or(false) {
Some("NOT NULL")
} else {
None
},
]
.into_iter()
.flatten()
.collect::<Vec<_>>()
.as_slice(),
]
.concat()
.join(" ")
}
pub trait SQLMapper: Sized {
type ValueType;
fn map_from_sql(_: std::collections::HashMap<String, Self::ValueType>) -> Self;
}
pub trait SQLTable: SQLMapper {
fn table_name(_: std::marker::PhantomData<Self>) -> String;
fn schema_of(_: std::marker::PhantomData<Self>) -> Vec<(String, String, FieldAttribute)>;
fn primary_key_columns(_: std::marker::PhantomData<Self>) -> Vec<String>;
fn constraint_primary_key_query(ty: std::marker::PhantomData<Self>) -> String {
let columns = SQLTable::primary_key_columns(ty);
format!("CONSTRAINT primary_key PRIMARY KEY({})", columns.join(","))
}
fn map_to_sql(self) -> Vec<(String, Self::ValueType)>;
fn create_index_query(
ty: std::marker::PhantomData<Self>,
index_name: &'static str,
index_keys: Vec<&'static str>,
) -> String {
let schema = SQLTable::schema_of(ty);
let table_name = SQLTable::table_name(ty);
for key in index_keys.iter() {
if !schema
.iter()
.map(|(column_name, _, _)| column_name.as_str())
.collect::<Vec<&str>>()
.contains(key)
{
panic!("index: column {} is not field of {}", key, table_name)
}
}
format!(
"CREATE INDEX {} ON {}({});",
index_name,
table_name,
index_keys.join(","),
)
}
fn create_unique_index_query(
ty: std::marker::PhantomData<Self>,
index_name: &'static str,
index_keys: Vec<&'static str>,
) -> String {
let schema = SQLTable::schema_of(ty);
let table_name = SQLTable::table_name(ty);
for key in index_keys.iter() {
if !schema
.iter()
.map(|(column_name, _, _)| column_name.as_str())
.collect::<Vec<&str>>()
.contains(key)
{
panic!("index: column {} is not field of {}", key, table_name)
}
}
format!(
"CREATE UNIQUE INDEX {} ON {}({});",
index_name,
table_name,
index_keys.join(","),
)
}
fn create_table_query(ty: std::marker::PhantomData<Self>) -> String {
let schema = SQLTable::schema_of(ty);
format!(
"CREATE TABLE IF NOT EXISTS {} ({}, {})",
SQLTable::table_name(ty),
schema
.into_iter()
.map(|(name, typ, attr)| create_column_query(name, typ, attr))
.collect::<Vec<_>>()
.as_slice()
.join(", "),
SQLTable::constraint_primary_key_query(ty),
)
}
fn save_query_with_params(self) -> (String, Vec<(String, Self::ValueType)>) {
let pairs = self.map_to_sql();
let keys = pairs.iter().map(|(k, _)| k).collect::<Vec<_>>();
(
format!(
"INSERT INTO {} ({}) VALUES ({})",
Self::table_name(std::marker::PhantomData::<Self>),
keys.iter()
.map(|k| k.as_str())
.collect::<Vec<_>>()
.join(", "),
keys.iter()
.map(|s| format!(":{}", s))
.collect::<Vec<_>>()
.as_slice()
.join(", "),
),
pairs,
)
}
}
pub fn table_name<T: SQLTable>() -> String {
SQLTable::table_name(std::marker::PhantomData::<T>)
}
pub fn schema_of<T: SQLTable>() -> Vec<(String, String, FieldAttribute)> {
SQLTable::schema_of(std::marker::PhantomData::<T>)
}
pub fn primary_key_columns<T: SQLTable>() -> Vec<String> {
SQLTable::primary_key_columns(std::marker::PhantomData::<T>)
}
pub fn create_index_query<T: SQLTable>(
index_name: &'static str,
index_keys: Vec<&'static str>,
) -> String {
SQLTable::create_index_query(std::marker::PhantomData::<T>, index_name, index_keys)
}
pub fn create_unique_index_query<T: SQLTable>(
index_name: &'static str,
index_keys: Vec<&'static str>,
) -> String {
SQLTable::create_unique_index_query(std::marker::PhantomData::<T>, index_name, index_keys)
}
pub fn map_from_sql<T: SQLMapper>(h: std::collections::HashMap<String, T::ValueType>) -> T {
SQLMapper::map_from_sql(h)
}
pub fn create_table_query<T: SQLTable>() -> String {
SQLTable::create_table_query(std::marker::PhantomData::<T>)
}
pub trait SQLValue<Type> {
fn column_type(_: std::marker::PhantomData<Type>, size: i32) -> String;
fn serialize(_: Type) -> Self;
fn deserialize(self) -> Type;
}