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use proc_macro::TokenStream;
use std::ops::Add;
use quote::quote;
use syn::{parse_macro_input, DeriveInput, Fields, Type};
#[proc_macro_attribute]
pub fn entity_option_mapping(attr: TokenStream, input: TokenStream) -> TokenStream {
let attr = attr.to_string();
let mut attr_split = attr.split(",");
let mut table_name = "";
if let Some(table_name_option) = attr_split.next() {
table_name = table_name_option.trim();
}
let mut primary_key = "";
if let Some(primary_key_option) = attr_split.next() {
primary_key = primary_key_option.trim();
}
let input_tokens: proc_macro2::TokenStream = input.clone().into();
let derive_input = parse_macro_input!(input as DeriveInput);
let struct_name = &derive_input.ident;
let mut primary_key_name = &derive_input.ident;
if let syn::Data::Struct(data) = &derive_input.data {
if let Fields::Named(named_fields) = &data.fields {
let mut assignment = vec![];
let mut stmts = vec![];
let mut params = vec![];
let mut update_sql = vec![];
let mut type_names = vec![];
for field in &named_fields.named {
if let Some(ident) = &field.ident {
assignment.push(quote! {#ident: None,});
let field_name = ident.to_string();
if field_name.eq(primary_key) {
primary_key_name = &ident;
}
type_names.push(field_name.clone());
update_sql.push(quote!{
if !self.#ident.eq(&None) {
update_sql = update_sql.add(" `");
update_sql = update_sql.add(#field_name);
update_sql = update_sql.add("` = :");
update_sql = update_sql.add(#field_name);
update_sql = update_sql.add(",");
}
});
let field_type = &field.ty;
if let Type::Path(type_path) = field_type {
// let type_name = &type_path.path.segments.last().unwrap().ident;
// let type_name = type_name.to_string();
let arguments = &type_path.path.segments.last().unwrap().arguments;
if let syn::PathArguments::AngleBracketed(args) = arguments {
if let Some(inner_ty) = args.args.first() {
let inner_ty_str = quote!(#inner_ty).to_string();
params.push(quote! {
if self.#ident.eq(&None) {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::NULL);
}
});
if inner_ty_str.eq("String") {
stmts.push(quote! {
if columns.contains(&&*#field_name) {
let value = &row[#field_name];
match value {
r2d2_mysql::mysql::Value::NULL => {}
r2d2_mysql::mysql::Value::Date(year, month, day, hour, minutes, seconds, micro_seconds) => {
vo.#ident = Some(format!("{}-{}-{} {}:{}:{}.{}", year, month, day, hour, minutes, seconds, micro_seconds));
}
r2d2_mysql::mysql::Value::Time(_is_negative, days, hours, minutes, seconds, micro_seconds) => {
vo.#ident = Some(format!("{} {}:{}:{}.{}", days, hours, minutes, seconds, micro_seconds));
}
_ => {
vo.#ident = row.get(#field_name);
}
}
}
});
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Bytes(self.#ident.clone().unwrap().as_bytes().to_vec()));
}
});
continue;
} else if inner_ty_str.eq("i8") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Int(self.#ident.unwrap().into()));
}
});
} else if inner_ty_str.eq("u8") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::UInt(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("i16") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Int(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("u16") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::UInt(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("i32") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Int(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("u32") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::UInt(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("i64") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Int(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("u64") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::UInt(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("isize") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Int(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("usize") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::UInt(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("f32") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Float(self.#ident.unwrap()));
}
});
} else if inner_ty_str.eq("f64") {
params.push(quote! {
else {
map.insert(#field_name.as_bytes().to_vec(), r2d2_mysql::mysql::Value::Double(self.#ident.unwrap()));
}
});
}
stmts.push(quote! {
if columns.contains(&&*#field_name) {
let value = &row[#field_name];
if !r2d2_mysql::mysql::Value::NULL.eq(value) {
vo.#ident = row.get(#field_name);
}
}
});
}
}
}
}
}
let mut insert_sql = String::from("INSERT INTO `");
insert_sql = insert_sql.add(table_name);
insert_sql = insert_sql.add("` (");
for type_name in type_names.clone() {
if type_name.eq(primary_key) {
continue;
}
insert_sql = insert_sql.add("`");
insert_sql = insert_sql.add(&*type_name);
insert_sql = insert_sql.add("`,");
}
insert_sql.remove(insert_sql.len() - 1);
insert_sql = insert_sql.add(") VALUES (");
for type_name in type_names {
if type_name.eq(primary_key) {
continue;
}
insert_sql = insert_sql.add(":");
insert_sql = insert_sql.add(&*type_name);
insert_sql = insert_sql.add(",");
}
insert_sql.remove(insert_sql.len() - 1);
insert_sql = insert_sql.add(")");
let impl_fn = quote! {
use std::ops::Add;
#input_tokens
impl r2d2_mysql_batis::entity::Entity for #struct_name {
fn table_name() -> &'static str {
#table_name
}
fn primary_key() -> &'static str {
#primary_key
}
fn insert_sql() -> &'static str {
#insert_sql
}
fn update_by_id_sql(&self) -> String {
let mut update_sql = String::from("UPDATE `");
update_sql = update_sql.add(#table_name);
update_sql = update_sql.add("` SET");
#(#update_sql)*
update_sql.remove(update_sql.len() - 1);
update_sql = update_sql.add(" WHERE `");
update_sql = update_sql.add(#primary_key);
update_sql = update_sql.add("` = :user_id LIMIT 1");
update_sql
}
fn params(&self) -> r2d2_mysql::mysql::Params {
let mut map = std::collections::HashMap::new();
#(#params)*
r2d2_mysql::mysql::Params::Named(map)
}
}
impl r2d2_mysql_batis::service::Service for #struct_name {
fn set_primary_key(&mut self, id: u64) {
self.#primary_key_name = Some(id);
}
}
impl r2d2_mysql::mysql::prelude::FromRow for #struct_name {
fn from_row(row: r2d2_mysql::mysql::Row) -> Self where Self: Sized {
let mut vo = Self {
#(#assignment)*
};
let mut columns = vec![];
for column in row.columns_ref() {
columns.push(std::str::from_utf8(column.name_ref()).unwrap());
}
#(#stmts)*
vo
}
fn from_row_opt(row: r2d2_mysql::mysql::Row) -> Result<Self, r2d2_mysql::mysql::FromRowError> where Self: Sized {
let mut vo = Self {
#(#assignment)*
};
let mut columns = vec![];
for column in row.columns_ref() {
columns.push(std::str::from_utf8(column.name_ref()).unwrap());
}
#(#stmts)*
Ok(vo)
}
}
};
return impl_fn.into();
}
}
TokenStream::default()
}